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1
VC-A565U/H965U
S41R7VC-A411U
SERVICE MANUAL
This document has been published to be used forafter sales
service only.The contents are subject to change without notice.
SHARP CORPORATION
VIDEO CASSETTE RECORDER
In the interests of user-safety (Required by safety regula-tions
in some countries) the set should be restored to itsoriginal
condition and only parts identical to those specifiedbe used.
VC-A565UVC-H965U
CONTENTS
Page
1. GENERAL INFORMATION
...........................................................................................................
5
2. DISASSEMBLY AND REASSEMBLY
...........................................................................................
7
3. FUNCTION OF MAJOR MECHANICAL PARTS
.........................................................................
10
4. ADJUSTMENT, REPLACEMENT AND ASSEMBLY OF MECHANICAL UNITS
........................ 12
5. ELECTRICAL ADJUSTMENT
.....................................................................................................
30
6. MECHANISM OPERATION FLOWCHART AND TROUBLESHOOTING GUIDE
...................... 32
7. TROUBLESHOOTING
................................................................................................................
38
8. BLOCK
DIAGRAM.......................................................................................................................
50
9. SCHEMATIC DIAGRAM AND PWB FOIL PATTERN
.................................................................
58
10. REPLACEMENT PARTS LIST
....................................................................................................
71
11. EXPLODED VIEW OF MECHANICAL PARTS
...........................................................................
76
12. PACKING OF THE SET
..............................................................................................................
83
MODELS
SE
RV
ICE
MA
NU
AL
MO
DE
LS V
C-A
565U/H
965UV
IDE
O C
AS
SE
TT
E R
EC
OR
DE
R
VC-H965U
VC-A565U
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2
VC-A565U/H965U
IMPORTANT SERVICE NOTES
WARNING :TO REDUCE THE RISK OF FIRE OR ELEC-TRIC SHOCK, DO NOT
EXPOSE THIS AP-PLIANCE TO RAIN OR MOISTURE.
RISK OF ELECTRIC SHOCKDO NOT OPEN
CAUTION
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK. DONOT REMOVE
COVER. NO USER-SERVICEABLEPARTS INSIDE. REFER SERVICING TO
QUALIFIEDSERVICE PERSONNEL.
This symbol warns the user of uninsulated voltagewithin the unit
that can cause dangerous electric shocks.
This symbol alerts the user that there are importantoperating
and maintenance instructions in the literatureaccompanying this
unit.
This symbol mark means fast operating fuse.For continued
protection against risk of fire, replaceonly with same type fuse
F901 (3.0A, 125V).
CAUTION:
BEFORE RETURNING THE VIDEO CASSETTERECORDER
Before returning the video cassette recorder to the user,perform
the following safety checks.
1. Inspect all lead dress to make certain that leads arenot
pinched or that hardware is not lodged betweenthe chassis and other
metal parts in the video cassetterecorder.
2. Inspect all protective devices such as non-metalliccontrol
knobs, insulation materials, cabinet backs,adjustment and
compartment covers or shields, isola-tion resistor/capacitor
networks, mechanical insula-tors etc.
3. To be sure that no shock hazard exists, check forcurrent in
the following manner.
● Plug the AC line cord directly into a 120 volt AC outlet(Do
not use an isolation transformer for this test).
● Using two clip leads, connect a 1.5k ohm, 10 wattresistor
paralleled by a 0.15µF capacitor in series withall exposed metal
cabinet parts and a known earthground, such as a water pipe or
conduit.
● Use an SSVM or VOM with 1000 ohm per volt, orhigher,
sensitivity or measure the AC voltage dropacross the resistor (See
Diagram).
● Move the resistor connection to earth exposed metalpart having
a return path to the chassis (antenna,metal cabinet, screw heads,
knobs and control shafts,
etc.) and measure the AC voltage drop across theresistor.
Reverse the AC plug on the set and repeatAC voltage measurements
for each exposed part.Any reading of 0.45V rms (this corresponds to
0.3mArms AC.) or more is excessive and indicates a poten-tial shock
hazard which must be corrected beforereturning the video cassette
recorder to the owner.
3.0A 125V
SSVMAC SCALE
1.5k ohms.10W
CONNECT TOKNOWN EARTHGROUND
TO EXPOSEDMETAL PARTS
0.15 µFTEST PROBE
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VC-A565U/H965U
NOTES DE SERVICE IMPORTANTES
ATTENTION: POUR REDUIRE LES RESQUES D'IN-CENDIE OU DE CHOC
ELECTRIQUE,NE PAS EXPOSER CET APPAREIL ALA PLUIE OU A
L'HUMIDITE.
RISQUE DE CHOC ELECTRIQUENE PAS OUVRIR
ATTENTION
Ce symbole avertit l'utilisateur que des instructionsimportantes
relatives à l'utilisation et àl'entretien setrouvent dans le manuel
accompagnant l'appareil.
ATTENTION: AFIN DE REDUIRE LES RISQUES DE CHOCELECTRIQUE, NE PAS
RETIRER LE COUVERCLE,AUCUN ORGANE INTERNE NE PEUT ETREREPARE PAR
L'UTILISATEUR. CONFIERL'APPAREIL A UN DEPANNEUR QUALIFIE.
Ce symbole signale à l'utilisateur la présence d'unetension non
isolée à l'intérieur de l'appareil qui peut êtrela cause de
secousses électriques dangereuses.
PRECAUTION:Cette marque indique le fusible à action in
stantansée.Pour la protection continue contre le risque
d'incendie,ne remplacer que par le fusible type F901 (3,0A,
125V).
AVANT DE RENDRE LE MAGNETOSCOPE
Avant de rendre le magnétoscope à l’utilisateur, effectuerles
vérifications de sécurité suivantes.
1. Vérifier toutes les gaines de fil pour être sûr que les
filsne sont pas pincés ou que le matériel n’est pas coincéentre le
châssis et les autres pièces métalliques dansle magnétoscope.
2. Vérifier tous les dispositifs de protection tels que
lesboutons de commande non métalliques, les matériauxd’isolement,
le dos du coffret, les couvercles decompartiment et ajustement ou
les boucliers, lesréseaux de résistance / condensateur d’isolement,
Iesisolateurs mécaniques, etc.
3. Pour être sûr qu’il n’y a aucun risque de choc
électrique,vérifier le courant de fuite de la maniére suivante.
● Brancher le cordon d’alimentation secteur directementdans une
prise de courant de 120 volts. (Ne pas utiliserde transformateur
d’isolement pour cet essai).
● Utiliser deux fils à pinces et connecter une résistancede 10
watts 1,5 kohm en parallèle avec un condensateurde 0,15 µF en série
avec des pièces du coffretmétallique exposées et une masse de terre
connuetelle qu’un tuyau ou un conduit d’eau.
● Utiliser un VTVM ou VOM avec une sensibilité de 1000ohms par
volt ou plus ou mesurer la chute de tensionCA entre la résistance
(voir diagramme).
● Déposer la connexion de la résistance à toutes les
pièces métalliques exposées ayant un parcours deretour au
châssis (connexions d’antenne, coffretmétallique, tétes de vis,
boutons et arbres decommande, etc.) et mesurer la chute de tension
CAentre la résistance. Inverser la fiche CA (une ficheintermédiaire
non polarisée doit être utilisée à seule finde faire ces
vérifications.) sur l’appareil et répéter lesmesures de tension CA
pour chaque piéce métalliqueexposée. Toute lecture de 0,45 Vrms
(ceci correspondà 0,3 mArms CA) ou plus est excessive et signale
undanger de choc qui doit être corrigé avant de rendre
lemagnétoscope à son utilisateur.
3,0A 125V
0,15 µFSONDE D'ESSAI
VERS PIECESMETALLIQUESEXPOSEES
VTVMECHELLE CA
1,5 KOHMS10W
CANNECTER AUNE MASSE DETERRE CONNUE
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4
VC-A565U/H965U
PRECAUTIONS IN PART REPLACEMENT
When servicing the unit with power on, be careful to the section
marked white all over.This is the primary power circuit which is
live.When checking the soldering side in the tape travel mode, make
sure first that the tape has been loaded and then turnover the PWB
with due care to the primary power circuit.Make readjustment, if
needed after replacement of part, with the mechanism and its PWB in
position in the main frame.
(1) Start and end sensors: Q701 and Q702Insert the sensor’s
projection deep into the upper hole of the holder. Referring to the
PWB, fix the sensors tightenough.
(2) Photocoupler: IC901Refer to the symbol on the PWB and the
anode marking of the part.
(3) Cam switches A and B: S704: QSW-RA001WJZZ.Adjust the notch
of the part to the white marker of the symbol on the PWB. Do not
allow any looseness.
(4) Take-up and supply sensors: D707 and D706.Be careful not to
confuse the setting direction of the parts in reference to the
symbols on the PWB. Do not allow anylooseness.
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VC-A565U/H965U
1. GENERAL INFORMATION1-1 FEATURESOnly for VC-H965U• Hi-Fi
Stereo Sound• Built-in MTS (Multi-channel TV Sound) Decoder•
Built-in Front AV Jacks
Common Features• EZ Set Up• S-VHS Quasi Playback• Double-Azimuth
4-Heads• 19µ Clear Picture System (in EP mode)• HQ System for
Better Resolution and Color Reproduction• Multi-Language
(English/Spanish/French) OSD (On Screen
Display) with Menu Screen Guidance• 181-channel PLL Quartz
Synthesized Random Access Tuner
with Automatic Channel Setting• Quick Start with Full Loading
Mechanism• 1-Year, 8 Event Programmable Timer• Simple Recording
Timer
• Universal Remote Control• Sharp Super Picture• 5 sec. Timer
Backup• Field-Still/Variable Slow/Frame Advance• Real-Time Counter
(On Screen Display)• Automatic Daylight Saving-Time (D.S.T.)
Adjustment• Blue Screen Noise Elimination• Auto Tracking Control
System• Digital Program Search System (DPSS)• Skip Search• Instant
Replay• Auto Zero Back• Recorded Section Auto Repeat• Full
Automatic Playback• Tamper Proof• Up to 8 Hours of Recording and
Playback (with T-160
cassette)
1-2 SPECIFICATIONSFormat: VHS NTSC Standard
Video Recording System: Rotary Two-Head Helical Scan
SystemNumber of Video Heads: 4
Video Signal Standard: NTSC Color SystemAudio Recording System:
1 Stationary Head for Linear Audio
2 Rotary Heads for Hi-Fi stereo (Only for Hi-Fi models)Tape
Width: 12.7 mm (1/2 inch)
Tape Speed: (SP) 33.35 mm/sec. (1.31 i.p.s.)(LP) 16.67 mm/sec.
(0.66 i.p.s.) (playback only)(EP) 11.12 mm/sec. (0.44 i.p.s.)
Maximum Recording Time: (SP) 160 min. (T-160)(EP) 480 min.
(T-160)
Channel Coverage: VHF 2-13UHF 14-69CATV 1-125
Antenna Input: 75 OhmVideo Input: 0.5 to 2.0 Vp-p, 75 Ohm
unbalanced
Video Output: 1.0 Vp-p, 75 Ohm unbalancedAudio Input: –8 dBs, 47
kOhm unbalanced (0 dBs = 0.775 Vrms)
Audio Output: –8 dBs, 1 kOhm unbalanced (0 dBs = 0.775
Vrms)Hi-Fi Audio (Only for Hi-Fi models):
Dynamic Range: 90 dBFrequency Response: 20 Hz-20 kHz
Memory Backup: 5 sec.Operating Temperature: 5°C to 40°C (41°F to
104°F)
Storage temperature: –20°C to 60°C (–4°F to 140°F)Power Source:
120 V AC, 60 Hz
Power Consumption: 14 WDimensions (approx.): 360 (W) x 92.0 (H)
x 232 (D) mm (14-3/16" x 3-10/16" x 9-9/64")
Weight (approx.): 2.3 kg (5.1 lbs)Accessories included: 75 ohm
coaxial cable, Operation manual, Infrared remote control, Battery
(2 pcs.)
Note: Specifications are subject to change without notice.
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VC-A565U/H965U
1-3 LOCATION OF MAJOR COMPONENTS AND CONTROL
Cas
sette
com
part
men
t (se
e P
layb
ack/
Rec
ord
ing
)
PO
WE
R b
utto
n(W
hen
pres
sed
to tu
rn o
n th
e V
CR
, PO
WE
R L
ED
indi
cato
rw
ill li
ght u
p. W
hen
the
pow
er is
turn
ed o
ff. P
OW
ER
LE
D
indi
cato
r w
il tu
rn o
ff.)
Bas
ic fu
nctio
n co
ntro
ls(s
ee P
layb
ack/
Rec
ord
ing
)
(VC
-H96
5U)
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7
VC-A565U/H965U
2. DISASSEMBLY AND REASSEMBLY
2-1 DISASSEMBLY OF MAJOR BLOCKS
TOP CABINET : Remove 2 screws 1.FRONT PANEL : Remove 2 screws 2
and 7 clips 3.OPERATION : Remove 1 screw 4.PWBSHIELD ANGLE : Remove
1 screw 5 with shield angle.MECHANISM/ : Remove 1 screw 6, 2 screws
7.MAIN PWB Remove 1 screw 8 with antenna
terminal cover. Remove 1 screw 9with top cabinet fix angle.
ANTENNATERMINALCOVER
MAIN FRAME
TOP CABINET
TOP CABINETFIX ANGLE
OPERATION PWB
LED HOLDER
MECHANISM/MAIN PWBASSEMBLY
ANTENNATERMINALCOVER
FRONT AVJACK
8
8
1
C
2 6
2
6
6
9
4
B
BB
B
A A
A
B
A
7
7
C
AVC-A565U
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VC-H965U
�VC-H965U
VC-A565U
Front Panel
B
3
3
VC-H965U
Front Panel
B
3
3
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VC-A565U/H965U
VC-H965U
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MECHANISM CHASSIS
2-2 DISASSEMBLING THE MECHANISM/MAIN PWB ASSEMBLY
1. When removing the mechanism from the main PWB,remove the
antenna cover 1 screw 1, and remove theantenna terminal
cover.Remove the screw 2 which connecting the PWB andthe
mechanism.Take out vertically the mechanism so that it does
notdamage the adjacent parts.
2. Removing the mechanism and cassette housing.Remove 2 screws 3
fixing the cassette housing to themechanism, and remove the
cassette housing.
3
CASSETTEHOUSING
MAIN PWB
1
2
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VC-A565U/H965U
2-3 CARES WHEN REASSEMBLING
INSTALLING THE CASSETTE HOUSINGWhen the cassette housing is
installed on the mechanism,the initial setting is essential
condition.There are two initial setting methods, namely electrical
andmechanical.1. Electrical initial settingSo as to perform initial
setting of mechanism execute theStep 1 of Installation of cassette
housing. After ascertainingthe return to the initial setting
position install the cassette
housing. (Conditions: When mechanism and PWB havebeen
installed)
2. Mechanical initial settingAfter ascertaining the return to
the initial set position installthe cassette housing in the
specified position. (This methodis applied only for the
mechanism.)
INSTALLING THE MECHANISM ON PWBLower vertically the mechanism,
paying attention to themechanism edge, and install the mechanism
with due careso that the parts are not damaged. So as to fix the
mecha-nism to the main PWB install two housings. (Fit the
antennacover to one of them.
PARTS WHICH NEED PARTICULAR CAREWhen installing the mechanism
chassis on the PWB unit,take care so as to prevent deformation due
to contact ofmechanism chassis with REC TIP SW.
Master cam
Push up
Drive lever
DRUM CONNECTOR
AE CONNECTOREND SENSOR
VC-H965U
VC-H565U
END TIP SW
AC HEAD CONNECTOR
START SENSOR
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10
VC-A565U/H965U
3. FUNCTION OF MAJOR MECHANICAL PARTS (TOP VIEW)
No. Function No. Function
1 Full erase head
2 Supply pole base ass’y
3 Tension arm
4 Idler wheel ass’y
5 Open guide
6 Supply reel disk
7 Supply main brake
8 Take-up main brake
9 Pinch drive cam
10 A/C head ass’y
11 Reverse guide lever ass’y
12 Reel relay gear
13 Take-up reel disk
14 Pinch roller lever ass’y
15 Drum ass'y
16 Loading motor block
17 Drum driver motor
18 Take-up pole base ass'y
17 15
11
5
9
14
12
8
16
1346
2
7
3
1
18 10
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VC-A565U/H965U
FUNCTION OF MAJOR MECHANICAL PARTS (BOTTOM VIEW)
No. Function No. Function
19 Syncro Gear
20 Master cam
21 Capstan D.D. motor
22 Reel belt
23 Clutch lever
24 Limiter pulley ass’y
25 Shifter
25
24
21
22
19
20
23
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VC-A565U/H965U
VROATSV CD
11.
10. JiGDRiVER-6 BM
9. JiGDRiVERH-4 AP
4. Torque Driver JiGTD1200 CB
4. ADJUSTMENT, REPLACEMENT AND ASSEMBLY OF MECHANICAL UNITSThe
explanation given below relates to the on-site general service
(field service) but it does not relates to the adjustmentand
replacement which need high-grade equipment, jigs and skill. For
example, the drum assembling, replacement andadjustment service
must be performed by the person who have finished the technical
courses.
4-1 MECHANISM CONFIRMATION ADJUSTMENT JIG
So as to perform completely the mechanism adjustment prepare the
following special jigs. So as to maintain the initialperformance of
the machine the maintenance and check are necessary. Utmost care
must be taken so that the tape isnot damaged. If adjustment needs
any jig, be sure to use the required jig.
JiGTG1200 CN
JiGMP0001 BY
1. Torque Cassette Meter JiGVHT-063 CZ
No. Jig ltem Part No. Code Configuration Remarks
JiGTG0090 CM
3. Torque Gauge Head JiGTH0006 AW
JiGRH0002 BR
JiGSG2000 BS
JiGSG0300 BF
7. JiGADP003 BK
Tension Gauge
These Jigs are used for checkingand adjusting the reel disk
height.
When fixing any part to the threadedhole using resin with screw,
use thejig. (Specified torque 5 kg)
This cassette torque meter is used for check-ing and adjusting
the torque of take-up formeasuring tape back tension.
These Jigs are used for checkingand adjusting the torque of
take-upand supply reel disks.
Master Plane Jig andReel Disk HeightAdjusting Jig
Pinch pressing forcemeasuring jig
This Jig is used with the tensiongauge. Rotary transformer
clearanceadjusting jig.
There are two gauges used for thetension measurements, 300 g
and2.0 kg.
These tapes are especially used forelectrical fine
adjustment.
Video Audio HiFi Audio Track
525 Monoscope 7k — 58µm
NTSC Color Bar 1k — 58µm
VROEFZCS BGOR
VROEFZHS BH
1k
This screwdriver is used for adjusting theguide roller
height.
For X value adjustment
This Jig is used for adjustmentof tension pole.
X value adjustmentgear driver
Tension PoleAdjustment Driver
2.3k
Black Level(only SYNC) signal — 19µm
2. Torque Gauge
6.
5.
8. Alignment Tape
Guide roller heightadjustment driver
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VC-A565U/H965U
4-2 MAINTENANCE CHECK ITEMS AND EXECUTION TIME
Perform the maintenance with the regular intervals as follows so
as to maintain the quality of machine.
NOTE : Part replacement. : Cleaning : Apply grease Cleaning
liquid Industrial ethyl alcohol
* This mechanism does not need electric adjustment with variable
resistor. Check parts. If any deviation is found, clean or replace
parts.
MaintainedParts
Remarks500hrs.
1000hrs.
1500hrs.
2000hrs.
Possible symptom encountered
Guide roller ass’y
Sup guide shaft
Reverse guide
Slant pole on pole base
Full erase head
A/C head
Upper and lower drum ass’y
Capstan D.D. motor
Pinch roller
Reel belt
Tension band ass’y
Loading motor
Idler ass’y
Limiter pulley
Supply/take-up main brake levers
Colour and beating
Small sound or sound distortionPoor S/N ratio, no colourPoor
flatness of the envelope with alignment tapeNo tape running, uneven
colourNo tape running, tape slackNo tape running, tape slack, no
fast forward/rewind motion
Lateral noises Head occasionally blocked
Abnormal rotation or significant vibration requires
replacement.
Clean tape contact part with the specified cleaning liquid.
Clean tape contact area with the specified cleaning liquid.
Clean rubber and rubber contact area with the specified cleaning
liquid.
Screen swaying
Cassette not loaded or unloaded
No tape running, tape slack
Tape slack
Video head cleaning procedure1. Apply one drop of cleaning
liquid to the cleaning paper with the baby oiler.2. Gently press
the cleaning paper against the video head to fix your finger, and
move the upper drum so that each head
is passed to and fro 5 times (do not move the cleaning paper).3.
Wipe with the dry cleaning paper.
Notes :• Use the commercially available ethanol of Class 1
as
cleaning liquid.• Since the video head may be damaged, do not
move up
and down the cleaning paper.• Whenever the video head is
cleaned, replace the clean-
ing paper.• Do not apply this procedure for the parts other than
the
video head.
Parts Code Description CodeZPAPRA56-001E Cleaning Paper
AWZOiLR-02-24TE Babe Oiler (Spoit) AH
Gently press the cleaning paper to fix with your finger, and
rotate the upper drum to clean.Move to and fro 5 times for each
head.(Do not move the cleaning paper.)
Rotate the upper drum with one hand.
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14
VC-A565U/H965U
Figure 4-1.
• Reassembly1. Before installing the cassette housing control,
short-
circuit between TP803 and TP802 provided at mainPWB, press the
eject button. The master cam turns andstops when the positioning
mark appears. Fit the drivelever to master cam through main
chassis, and push upthe drive lever.
Figure 4-2.
2. Install in the reverse order of removal.
Notes:1. In the case when you use the magnet screw driver,
never
approach the magnet driver to the A/C head, FE head,and
drum.
2. When installing or removing, take care so that thecassette
housing control and tool do not contact theguide pin or drum.
3. After installing the cassette housing control once per-form
cassette loading operation.
4-4 TO RUN A TAPE WITHOUT THE CASSETTEHOUSING CONTROL
ASSEMBLY
1. Remove the full-surface panel.2. Short-circuit between TP803
and TP802.3. Plug in the power cord.4. Turn off the power
switch.
(The pole bases move into U.L.position.)5. Open the lid of a
cassette tape by hand.6. Hold the lid with two pieces of vinyl
tape.7. Set the cassette tape in the mechanism chassis.8. Stabilize
the cassette tape with a weight (500g) to
prevent floating.9. Turn on the power switch.10. Perform running
test.
4-3 REMOVING AND INSTALLING THE CAS-SETTE HOUSING
• Removal1. In the cassette removing mode, remove the
cassette.2. Unplug the power cord.3. Remove in the following
numerical order.
a) Remove two screws 1.b) Pull the drive lever slide and pull up
the cassette
housing control.
Figure 4-3.
Note:The weight should not be more than 500g.
To take out the cassette tape.1. Turn off the power switch.2.
Take out the cassette tape.
1
Master cam
Push up
Drive lever
500g
Weight to preventfloat (500g)
Mechanism chassis
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15
VC-A565U/H965U
4-5 REEL DISK REPLACEMENT AND HEIGHTCHECK
• Removal1. Remove the cassette housing control assembly.2.
Remove the Supply/Take-up main brake ass'y.3. Pull the tension band
out of the tension arm ass'y.4. Remove the reel disk.Note:Take care
so that the tension band ass'y and main brakeass'y are not
deformed.
Notes:1. When installing the reel disk, take due care so that
the
tension band ass'y is not deformed and grease does noadhere.
2. Do not damage the Supply main brake ass'y. Be carefulso that
grease does not adhere to the brake surface.
• Reassembly (Take-up reel disk)1. Clean the reel disk shaft and
apply grease (SC-141) to
it.2. Align the phase of the reel disk to that of the reel
relay
gear and to install a new take-up reel disk onto the shaft.3.
Check the reel disk height and reassemble the take-up
main brake ass'y.Note:1. Take care so that the Take-up main
brake ass'y is not
damaged. Take care so that grease does not adhere thebrake
surface.
2. After reassembly, check the video search rewind backtension
(see 4-10), and check the brake torque (see 4-14).
• Height checking and adjustmentNote:
1. Set the master plane with due care so that it does notcontact
the drum.
2. When putting the master plane, shift the reverse guidea
little in the loading direction. Care must be taken sinceexcessive
shift results in damage.
Figure 4-4.
Note:• Check that the reel disk is lower than part A but
higher
than part B. If the height is not correct, readjust the reeldisk
height by changing the poly-slider washer under thereel disk.
• Reassembly (Supply reel disk)1. Clean the reel disk shaft and
apply grease (SC-141) to
it.2. Match the phases of reel disk and reel relay gear, and
set
the new reel disk.3. After checking the reel disk height, wind
the tension
band ass'y around the reel disk, and hook to tension
armass'y.
4. Assemble the Supply main brake ass'y.
�
Take-up reel diskSupply reel disk
TenTension arm ass'ySupply main brake
Tension band ass'y
Take-up main brake ass'y
Supply reel disk
Take-up reel disk
Cassette lockrelease shaft
Master plane
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16
VC-A565U/H965U
Note:Whenever replacing the reel disk, perform the height
check-ing and adjustment.
Notes:1. Hold the torque gauge by hand so that it is not
moved.2. Do not keep the reel disk in lock state. Do not allow
long-
time measurement.
4-7 CHECKING AND ADJUSTMENT OF TAKE-UP TORQUE IN REWIND MODE
• Remove the cassette housing control assembly.
• After short-circuiting between TP803 and TP802provided at
operation PWB, plug in the power cord.
• Setting1. Set a torque gauge to zero on the scale. Place it on
the
supply reel disk.2. Press the rewind button.3. To calculate the
remaining capacity, slowly rotate the
take-up reel disk, and then shift it into the rewind mode.
• Checking1. Turn the torque gauge slowly (one rotation every 2
to 3
seconds) by hand in the CCW direction.2. Make sure that the
indication of torque gauge is not less
than 30mN·m (306gf·cm).
A B
Figure 4-5.
Master planeReel disk heightadjusting jig
Mechanism chassis
Reel disk
10 ± 0.2mm Reel disk
4-6 CHECKING AND ADJUSTMENT OF TAKE-UP TORQUE IN FAST FORWARD
MODE
• Remove the cassette housing control assembly.
• After short-circuiting between TP803 and TP802provided at
operation PWB, plug in the power cord.
• Setting1. Set a torque gauge to zero on the scale. Place it on
the
take-up reel disk.2. Press the FF button.3. To calculate the
remaining capacity of the play back
mode, slowly rotate the supply reel disk, and then shiftit into
the forward mode.
• Checking1. Turn the torque gauge slowly (one rotation every 2
to 3
seconds) by hand in the CW direction.2. Make sure that the
indication of torque gauge is not less
than 30mN·m (306gf·cm).
Figure 4-7.
Torque gauge
30mN·m (306gf·cm)or more
Supply reel disk
Idler ass'y
The gauge is held atits maximum value.(Red mark)
• Adjustment1. If the rewind winding-up torque is less than the
specified
value, clean the capstan D.D. worm gear, drive belt, andlimiter
pulley with cleaning liquid, rewind again, andcheck the winding-up
torque.
2. If the winding-up torque is still out of range, replace
thedrive belt.
Figure 4-6.
Torque gauge
30mN·m (306gf·cm)or more
The gauge is held atits maximum value.(Red mark)
Idler ass'y
• Adjustment1. If the FF winding-up torque is less than the
specified
value, clean the capstan D.D. worm gear, drive belt, andlimiter
pulley with cleaning liquid, and check again.
2. If the torque is less than the set value, replace the
reelbelt.
CCW
CW
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VC-A565U/H965U
Notes:1. Hold the torque gauge by hand so that it is not
moved.2. Do not keep the reel disk in lock state. Do not allow
long-
time measurement.
4-8 CHECKING AND ADJUSTMENT OF TAKE-UP TORQUE IN
RECORD/PLAYBACKMODE
• Remove the cassette housing control assembly.• After
short-circuiting between TP803 and TP802
provided at operation PWB, plug in the power cord.• Turn off the
power switch.• Open the cassette torque meter lid, and fix it
with
tape.• Load the cassette torque meter into the unit.• Put the
weight (500g) on the cassette torque meter.• Turn on the power
switch.• Press the picture record button, and set EP picture
record mode (x3).
4-9 CHECKING AND ADJUSTMENT OF TAKE-UP TORQUE IN VIDEO SEARCH
REWINDMODE
• Remove the cassette housing control assembly.
• After short-circuiting between TP803 and TP802provided at
operation PWB, plug in the power cord.
• SettingPress the playback button and rewind button to set
thevideo search rewinding mode.
• CheckingPlace the torque gauge on the supply reel disk, and
turn itcounterclockwise very slowly (one rotation every 1 to
2seconds) and check that the torque is within the set valuechange
to 14.1 ± 3.5mN⋅m. (144 ± 35gf⋅cm)
Set value EP change to 6.9 mN⋅m (70 gf⋅cm)
Figure 4-8.
• Checking1. Make sure that value is within the setting 6.9
mN·m
(70 gf·cm).2. The winding-up torque fluctuates due to variation
of
rotation torque of limiter pulley ass'y. Read the centervalue of
fluctuation as setting.
3. Set the EP record mode (x3) and make sure that thewinding-up
torque is within setting.
• AdjustmentIf the playback winding-up torque is not within the
setting,replace the limiter pulley assembly.Note:When the torque
cassette is set, put a weight (500g) toprevent rise.When the
cassette torque meter is taken out.Turn off the power switch.
Figure 4-9.
Note:Surely put the torque gauge on the reel disk to measure.
Ifthe torque gauge is raised, accurate measurement
isimpossible.
• AdjustmentIf the rewinding playback winding-up torque is not
within thesetting, replace the limiter pulley assembly.
Note:The winding-up torque fluctuates due to variation of
rota-tion torque of supply reel disk. Read the center value
offluctuation as setting.
Torque gauge
Supply reel disk
CCW
+20–25
+2.0–2.5
+2.0–2.5
+20–25
500g
Cassette torque meter
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VC-A565U/H965U
Figure 4-11.
1. Detach the pinch roller from the capstan shaft.Do not
separate excessively. Or the pinch lever andpinch double action
lever may disengage.
2. Engage the tension gauge adapter with the pinch rollershaft,
and pull in the arrow direction.
3. Gradually return the pinch roller, and measure thepulling
force when the pinch roller contacts the capstanshaft.
4. Make sure that the measured value is within settingchange to
9.8 ± 1N (1.0 ± 0.1kgf).
4-12 CHECKING AND ADJUSTMENT OFTENSION POLE POSITION
• Remove the cassette housing control assembly.
• After short-circuiting between TP803 and TP802provided at
operation PWB, plug in the power cord.
• Setting1. Turn off the power switch.2. Open the cassette tape
(T-120), and fix with tape.3. Set the cassette tape in loading
state.4. Put the weight (500g) on the cassette tape.5. Turn on the
power switch.6. Make the adjustment with the beginning of a T-120
tape.
4-10 CHECKING THE VIDEO SEARCH REWINDBACK TENSION
• Remove the cassette housing control assembly.
• After short-circuiting between TP803 and TP802provided at
operation PWB, plug in the power cord.
• Checking1. After pressing the play button, press the rewind
button,
and set the video search rewind mode.2. Place the torque gauge
on the take-up reel disk, and turn
it counterclockwise very slowly (one rotation every 2 to3
seconds) and check that the torque is within the setvalue 3.4 ±
1.5mN⋅m (35 ± 15gf⋅cm).
Pinch roller Tension gauge900 - 1,200gf
Capstan shaft
Tension gauge adapter
Figure 4-10.
Torque gauge
Take-up reel disk
Notes:Set the torque gauge securely on the take-up reel disk.If
it is not secure, the measurement will be incorrect.
4-11 CHECKING THE PINCH ROLLERPRESSURE
• Remove the cassette housing control assembly.
• After short-circuiting between TP803 and TP802provided at
operation PWB, plug in the power cord.
• CheckingPress the play button to set the playback mode.
CCW
Figure 4-12.• Checking1. Set a cassette tape, push the REC
button to place the
unit in the SP record mode. Now check the tension
poleposition.
500g
Weight to preventfloat (500g)
(T-120)
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VC-A565U/H965U
2. Visually check to see if the position of the tension pole
iswithin the 0 ± 0.2mm from the left side line.
Insert the tension pole adjustment driver, and rotate
clock-wise.
Figure 4-15.
At left side from the reference line. (A).
Figure 4-13.
Figure 4-14.
Insert the tension pole adjustment driver, and
rotatecounterclockwise.
At right side from the reference line. (A).
Tension pole adjustment driver adjusting direction
Standard A = 0 ± 0.2mm
4-13 CHECKING AND ADJUSTMENT OFRECORD/PLAYBACK BACK TENSION
• Remove the cassette housing control assembly.
• After short-circuiting between TP803 and TP802provided at
operation PWB, plug in the power cord.
• Setting1. Turn off the power switch.2. Open the torque
cassette meter and fix with tape.3. Set the cassette tape in
loading state.4. Put the weight (500g) on the cassette torque
meter.5. Turn on the power switch.
Make the adjustment with the beginning of a T-120 tape.
Figure 4-16.
Figure 4-17.
• Checking1. Push the REC button to place the unit in the SP
record
mode.2. At this time ascertain that the back tension is within
the
setting change to 3.9 to 5.5mN⋅m (40 to 56gf·cm) byseeing the
indication of torque cassette meter.
A
A
A
Tension poleadjustmentdriver
CW CC
W
500g
Weight to preventfloat (500g)
Cassette torquemeter
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20
VC-A565U/H965U
• Adjustment1. If the indication of torque cassette meter is
lower than
the setting, shift the tension spring engagement to thepart
A.
2. If the indication of torque cassette meter is higher thanthe
setting, shift the tension spring engagement to thepart B.
• Checking the brake torque at the take-up side
Figure 4-20.
CCW: 4.41 ± 1.5mN⋅m (45 ± 15gf⋅cm)CW: 4.12 ± 1.2mN⋅m (42 ±
12gf⋅cm)
• Remove the cassette housing control assembly.
• After short-circuiting between TP803 and TP802provided at
operation PWB, plug in the power cord.
• Setting1. Switch from the FF mode to the STOP mode.2.
Disconnect the power cord.3. Set a torque gauge to zero on the
scale. Place it on the
take-up reel disk.
• Checking1. Turn the torque gauge at a rate of about one turn/2
sec
in the CCW direction/CW direction so that the reel diskand
torque gauge pointer rotates at equal speed andmake sure that the
value is within the setting (CCWdirection: 4.41 ± 1.5mN·m (45 ±
15gf·cm), CW direction:4.12 ± 1.2mN·m (42 to 12gf·cm).
2. Adjustment of the brake torque at the supply side and
thetake-up side
• Unless the supply side brake torque or take-up sidebrake
torque is within the setting, clean the felt surfaceof reel disk
(supply, take-up) brake lever, check againthe brake torque.
• If value cannot be set within the setting yet, replace themain
brake ass'y or main brake spring.
Figure 4-18.
4-14 CHECKING THE BRAKE TORQUE• Checking the brake torque at the
supply side
CCW: 4.41 ± 15mN⋅m (45 ± 15gf⋅cm)CW: 4.12 ± 1.2mN⋅m (42 ±
12gf⋅cm)
Figure 4-19.• Remove the cassette housing control assembly.
• After short-circuiting between TP803 and TP802provided at
operation PWB, plug in the power cord.
• Setting1. Set a torque gauge to zero on the scale. Place it on
the
supply reel disk.2. Switch from the FF mode to the STOP mode.3.
Disconnect the power cord.
• CheckingTurn the torque gauge at a rate of about one turn/2
secin the CW direction/CCW direction with respect to thesupply reel
disk so that the reel disk and torque gaugepointer rotate at equal
speed, and make sure that thevalue is within the setting (CW
direction: 4.12 ± 1.2mN·m(42 ± 12gf·cm); CCW direction: 4.41 ±
15mN·m (45 ±15gf·cm).
Tension arm
Tension spring
CW
CCW CW
Supply reel disk
Torque gauge
Torque gauge
CCW
Take-up reeldisk
A B
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VC-A565U/H965U
Figure 4-22.
• Replacement1. Solder the removed PWB to the new head
assembly.2. Adjust the height from the A/C head arm (lower
surface)
to the A/C head plate to 10.8mm with slide calipers. (3places of
azimuth screw section, tilt screw section and A/C head front
section) (See the figure below.)
3. Align the left end of gear of A/C head arm with thepunched
mark of chassis, tentatively tighten the screws1 so as to ensure
smooth motion of A/C head arm.Tightening torque must be 0.45 ±
0.05N·m (4.5 ±0.5kgf·cm).
4-15 REPLACEMENT OF A/C (AUDIO/CONTROL)HEAD
1. Remove the cassette housing control assembly.2. In unloading
state unplug the power cord.
• Removal1. Remove the screws 123, Tilt screw.2. Unsolder the
PWB fitted to the A/C head.Notes:1. When replacing, never touch the
head. If you touched,
clean with the cleaning liquid.2. When removing the screw 3,
take care so that the
spring may out.
Figure 4-23.
Note:1. If the screw 1 is tighten tentatively too loose, the
azimuth and height of A/C head may change when theyare finally
tightened. Therefore care must be taken.
2. After completion of A/C head be sure to adjust taperunning.
(Execute the running adjustment by the methoddescribed in
4-17.)
Figure 4-21.
Height screw
Left end of A/C head arm gearPunched line mark on chassis
13
1
2
AC head screw
Azimurh spring
Height adj. screw
AC head PWB ass'y(with A/E)
Tilt screw
Height Adj. spring
AC head PWBAzimuth adj. screw
*Derection designation.(The bottom part is big.)
A/C head plate
10.8mm
A/C head FFC
A/C FFC holder
Solder
AC head PWB
New A/C head ass'y
A/C head plate
*Fit the groove of FFC to the boss of the holder.
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VC-A565U/H965U
4-17 ADJUSTMENT OF TAPE DRIVE TRAIN1. Tape run rough
adjustment
1 Remove the cassette housing control assembly.2 After
shortcircuiting between TP803 and TP802 pro-
vided at operation PWB, plug in the power cord.3 Check and
adjust the position of the tension pole.
(See 4-12.)4 Check and adjust the video search rewind back
tension. (See 4-10.)5 Connect the oscilloscope to the test point
for PB ATR
signal output (TP201). Set the synchronism of theoscilloscope to
EXT. The PB ATR signal is to betriggered by the head switching
pulse (TP202).
6 Set the alignment tape (VROATSV) to play. (Put a500g weight on
the cassette tape to prevent lift ofcassette tape.)
500g
Figure 4-26.
7 Press the tracking button (+), (–) and change theATR signal
waveform from max to min and from minto max. At this time make sure
that the ATR signalwaveform changes nearly parallel.
8 Unless the ATR signal waveform changes nearlyparallel, adjust
the height of supply side and take-upside guide roller so that the
envelope waveformchanges nearly parallel. (For ATR signal
adjustmentprocedure refer to Figure 4-30.)
9 Turn the tilt screw to remove the tape crease at thefixing
guide flange.Playback the tape and check for tape crease at
thefixing guide flange.(1) If there is no tape crease
Turn the tilt screw clockwise so that tape creaseappears once at
the flange, and then return the tiltscrew so that the crease
disappears.
(2) If there is tape creaseTurn counterclockwise the tilt screw
so that thetape crease disappears.(Reference) If the tilt screw is
turned clockwisecrease appears at the lower flange.
Guide roller
Weight of 500g
Cassette Tape
Figure 4-24.
Figure 4-25.
Tape
0.3mm
A/C head
• AdjustmentAdjust the height screw visually so that the control
head isvisible 0.3mm below the bottom of the tape.
1. Set the cassette tape in the unit.2. Press the PLAY button to
put the unit in the playback
mode.3. Roughly adjust the height of the A/C head by turning
the
height screw until the tape is in the position shownbelow.
4-16 A/C HEAD HEIGHT ROUGH ADJUSTMENT
• Setting
500g
Weight to preventfloat (500g)
Mechanism chassis
Cassette tape
Height screw
TiH screw
Azimuth screw
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VC-A565U/H965U
Notes:1. Previously set the tracking control in the center
position,
and adjust the ATR signal waveform to maximum with Xvalue
adjustment nut. Thereby the tape run rough ad-justment is
facilitated.
2. Especially the outlet side ATR signal waveform musthave
higher flatness.
2. Adjustment of A/C head height and azimuth1 Perform the
initial setting of A/C head position by the
method stated in "4-15 Replacement 3".2 Connect the oscilloscope
to the audio output termi-
nal.3 Using the alignment tape in which 1 kHz linear audio
signal has been recorded, adjust the height screw soas to get
max audio output.
4 Using the alignment tape in which 7 kHz linear audiosignal has
been recorded, adjust the azimuth screwso as to get max audio
output.
5 The adjustment of 3 and 4 twice or three timesrepeat, and
finally adjust 4.
Figure 4-27.
For X value adjustmentAdjust the X value, turning the gear-type
screwdriver.
Figure 4-28.
3. Tape run adjustment1 Connect the oscilloscope to PB ATR
signal output
test point, set oscilloscope sync to EXT, trigger-inputthe PB
CHROMA signal (head switching pulse).
2 Rough adjustment of X valueTentatively fix A/C head arm screws
1 by the methoddescribed in 4-15 "Replacement 3".Playback the
alignment tape (VROATSV) andshortcircuit between TP801 and TP802.
As a resultthe auto-tracking is automatically cancelled, so thatthe
X value adjustment mode is set.Move the A/C head with the X value
adjustment geardriver (JiGDRiVER-6) by the method shown in Fig-ure
4-33, and adjust the A/C head so as to get themaximum ATR signal
waveform. (Note: When the A/C head is adjusted, adjust so that the
maximum ATRsignal waveform is obtained nearest the position
ofinitial setting made in 4-15.)
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VC-A565U/H965U
3 Next, press the tracking button (+), (–) and changethe ATR
signal waveform from max to min and frommin to max. At this time
adjust the height of supplyand take-up side guide roller with the
adjustmentdriver (JiGDRiVERH-4) so that the ATR signal wave-form
changes nearly parallel.
4 If the tape is lifted or sunk from the helical leadsurface,
the PB ATR signal waveform appears asshown in Figure 4-30.
5 Press the tracking button (+), (–) and make sure thatthe ATR
signal waveform changes nearly parallel.
6 Finally, check tape crease near the reverse guide. Iftape
crease is found, adjust tilt screw 45˚ counterclockwise. Small tape
crcase will appear at retainguide after this adjustment
finished.
3 Move the A/C head with the X value adjustment geardriver by
the method shown in Figure 4-33, andadjust the A/C head so as to
get the maximum ATRsignal waveform. (Note: At this time adjust so
as toget the maximum ATR signal waveform nearest theA/C head
position which has been set in case of Xvalue rough adjustment as
stated in 4-17, 3- 2.)
4 Adjust the playback switching point (Refer to theelectric
adjustment method.)
5 Playback the self-picture-recorded tape, and checkthe flatness
of ATR signal waveform and sound.
Notes:When the A/C head X value adjustment is performed, besure
to perform at first X value rough adjustment (refer to 4-17,
3-2).
PB ATRSignal
Head switching pulse
Figure 4-29.
4. A/C head X value adjustment1 Fix A/C head arm screws 1 by the
method described
in 4-15 "Replacement 3".2 Playback the alignment tape (VROATSV),
and
shortcircuit between TP801 and TP802. As a resultthe
auto-tracking is automatically cancelled, so thatthe X value
adjustment mode is set.
Take-up side Supply side Take-up side
Adjustment
Supply side
Supply side guide rollerrotated in clockwisedirection (lowers
guideroller) to flattenATR signal.
Take-up side guide rollerrotated in clockwisedirection (lowers
guideroller) to flattenATR signal.
Supply side guide rollerrotated in counterclock-wise direction
(raisesguide roller) to make thetape float above the helicallead.
The supplyside guide roller is thenrotated in the
clockwisedirection to flatten theATR signal.
Take-up side guide rollerrotated in counterclock-wise direction
(raisesguide roller) to make thetape float above thehelical lead.
The take-upside guide roller is thenrotated in the
clockwisedirection to flatten theATR signal.
Figure 4-30.
When the tape is below the helical lead.When the tape is above
the helical lead.
Figure 4-31.
1
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VC-A565U/H965U
4-19 REPLACEMENT OF DRUM D.D. MOTOR1. Set the ejection mode.2.
Withdraw the main power plug from the socket.
• Removal (Perform in numerical order.)1. Disconnect the FFC
cable 1.2. Unscrew the D.D. stator assembly fixing screws 2.3. Take
out the D.D. stator assembly 3.4. Unscrew the D.D. rotor assembly
fixing screws 4.5. Take out the D.D. rotor assembly 5.
Notes:1. In removing the D.D. stator assembly, part of the
drum
earth spring pops out of the pre-load collar.Be careful not to
lose it.
2. Install, so that the D.D. rotor ass'y and upper drum
ass'ymounting direction check holes align.(Align the upper drum
dent with the rotor hole.)
3. Be careful not to damage the upper drum or the videohead.
4. Protect the hole elements from shock due to contact withD.D.
stator or D.D. rotor ass'y.
5. After installation adjust the playback switching point
foradjustment of servo circuit.
4-18 REPLACEMENT OF THE CAPSTAN D.D.(DIRECT DRIVE) MOTOR
• Remove the mechanism from the main PWB (refer to 2-2 item 1
When removing the mechanism from the mainPWB ).
• Removal (Follow the order of indicated numbers.)
1. Remove the reel belt 1.2. Remove the slow brake lever 2.3.
Remove the three screws 3.
• Reassembly1. Taking care so that the capstan shaft does not
contact
the mechanism chassis, set its position on the mecha-nism
chassis, and then install with the three screws.
2. Install the reel belt.
Notes:1. After installing the capstan D.D. motor, be sure to
rotate
the capstan D.D. motor and check the movement.2. Set the tape,
and check for the tape crease near the
reverse guide in the playback mode. Adjust the A/Chead and
azimuth as stated in 4-17 item 2.
Figure 4-33.
Figure 4-32.
Capstan D.D.motor
Capstan D.D. motorcontrol PWB
3
Reel belt12
2 1
4
5
4
D.D. rotor ass'y
D.D.stator ass'y
Upper drum
FFC
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VC-A565U/H965U
4-21 ASSEMBLING OF PHASE MATCHINGMECHANISM COMPONENTS
• Assemble the phase matching mechanism compo-nents in the
following order.
1. Assemble the reverse guide lever and pinch drive cam.2.
Mounting the shifter (on the back of the mechanism
chassis).3. Mounting the master cam (on the back of the
mecha-
nism chassis).4. Assemble the loading motor parts.
• PINCH DRIVE CAM AND REVERSE GUIDELEVER ASSEMBLING METHOD.
(Place the following parts in position in numerical
order.)(1)Pinch drive cam(2)Reverse guide spring 2(3)Reverse guide
lever ass’y 3(4)Open guide
4-20 REPLACING THE UPPER AND LOWERDRUM ASSEMBLY
• Replacement (Perform in the numerical order)1Remove the motor
as stated in 4-19 D.D. motor replace-
ment.2Remove the drum earth brush ass’y 2.3Remove the upper and
lower drum assembly from main
chassis 1. 4. Remove the drum FFC holder 3.
[Cares when replacing the drum]1. Be careful so that the drum
earth brush is not lost.2. Do not touch directly the drum
surface.3. Fit gently the screwdriver to the screws.4. Since the
drum assembly is an extremely precise as-
sembly, it must be handled with utmost care.5. Make sure that
the drum surface is free from dust, dirt
and foreign substances.6. After replacing the drum be sure to
perform the tape
running adjustment.After that, perform also the electrical
adjustment.• Playback switching point adjustment• X-position
adjustment and check• Standard and x-3 slow tracking adjustment
7. After replacing the drum clean the drum.
Figure 4-34.
Figure 4-35.
2
1
3
Lower dorum bottom side
4
2
3
1
Dot B
Dot A
Insert it into the groove of the shaft
Don't run upon the spring
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27
VC-A565U/H965U
Figure 4-37.
4-22 INSTALLING THE SHIFTER
Figure 4-36.
1. Make sure that the loading arm T and S are at the
Phase-Matching point as shown below .
2. Fix the shifter position setting part to the roading arm
Tposition setting part as shown in figure .
3. Make sure tension arm not run on the shifter as shownin
figure .
a
b
c
Loading arm (T)
Shifter
Insert point
Loading arm (T)Loading arm (S)
Phase matting
*Not run on the sifter.
Sifter
Tension arm
Drum
Limiter pully
Capstan D.D.motor
(Bottom side of mechanism chassis)
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VC-A565U/H965U
4-23 INSTALLING THE MASTER CAM (ATREAR SIDE OF MECHANISM
CHASSIS)
1. Make sure beforehand that the shifter is at initial
posi-tion.
2. Place the master cam in the position as shown below.
Note:See the figure below for the phase matching between
themaster cam synchro gear and pinch drive cam.3. Finally fix with
the E ring.
4-24 REPLACEMENT OF LOADING MOTOR• Removal
• ReplacementRemove the loading motor, and install the
replacementloading motor as shown below.
Figure 4-40.
Figure 4-38-2.
The loading motor pressing-in must be less than 14.7 N(1,500
gf).Adjust the distance between motor and pulley to 6.95 mm.
Figure 4-38-1.
Figure 4-39.
+0. 2–0.15
E-ring
Line of synchro gear.
Phase matching
Phase matching
Hole of Pinch drive cam.
Synchro gear Master cam
6.95 mm
A part
Worm gear+0 -0.15
Loading motor
To press the motor in, first receive it by portion A.
Apply grease
Worm gear
Apply grease
Apply grease
Apply grease
L-M-Block.
Worm wheel gear.
Leading connect gear.
*Apply grease to the tip as well.
Loadingmotor.
Wire+ : Red- : White
Red
Insert
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VC-A565U/H965U
2. Frame R, Frame L, Drive Arm R, Drive Arm L, UpperPlate.
4-25 ASSEMBLY OF CASSETTE HOUSING1. Proof lever Proof lever
spring and Holder R
Figure 4-41.
MSPRD0215AJFJ
*Proof lever spring fixing direction designated.
LANGF9661AJFW
Top surface should be free from scratches or soil.
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VC-A565U/H965U
5. ELECTRICAL ADJUSTMENT
Notes:• Before the adjustment:
Electrical adjustments discussed here are often required after
replacement of electronic components and mechanicalparts such as
video heads.Check that the mechanism and all electric components
are in good working condition prior to the adjustments,
otherwiseadjustments cannot be completed.
• Instruments required:• Color TV monitor • Dual-trace
oscilloscope• Audio signal generator • AC milli-voltmeter• Blank
video cassette tape • Alignment tape (VROEFZHS)• Screwdriver for
adjustment • Color bar generator• RF signal generator
TP201~204
Figure 5-1.
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31
VC-A565U/H965U
SERVO CIRCUIT ADJUSTMENT
5-1 ADJUSTMENT OF HEAD SWITCHINGPOINT
Measuring Color TV monitorinstrument
Mode Playback still
Cassette Self-recorded tape (SP mode)(See Note below 2)
Control Tracking control buttons(+) or (–)
Specification No vertical jitter of picture
Measuring Color TV monitorinstrument
Mode Playback
Cassette Self-recorded tape (EP mode)(See Note below)
Control Tracking control buttons(+) or (–)
Specification No Poor picture and Hi-Fi sound
5-2 ADJUSTMENT OF FV (False VerticalSync) OF STILL PICTURE
Measuring Dual-trace oscilloscopeinstrument
Mode Playback
Cassette Alignment tape (VROEFZHS)
Test point VIDEO OUT jack to CH2TP202 (Sig.)~TP203 (GND) to
CH1
Control Call up the test mode (short circuitbetween TP801 and
TP802 on theoperation PWB). Use the tracking/channel select (') and
(") buttonsof the set.
Specification 6.0 ± 0.5H (lines)
1. Connect a dual-trace oscilloscope to the VIDEO OUTjack and
TP202 (Sig.) and TP203 (GND).(Trigger the oscilloscope with the
head switching pulseon TP202.)
2. Playback the alignment tape, and then short circuitbetween
TP801 and TP802 on the operation PWB to callthe test mode.
3. Press the PLAY button, and the play LED starts blinkingand
the automatic adjustment function gets started.
4. Wait until the play LED stays on to indicate that
theadjustment is complete.
5. Watch the oscilloscope screen and make sure that theleading
edge of the head switching pulse is 6.0H (lines)ahead of the
vertical sync as shown in Figure 5-2.
6. If the setting is out of this range, readjust the data
usingthe channel select (') and (") buttons of the set or theremote
controller.
7. Finally press the STOP button to quit the test mode.
Figure 5-2.
6.0 ± 0.5H (lines)CH-1HEADSWITCHINGPULSE
CH-2VIDEO OUT
CH-1: 1V/dev 50µsec/devCH-2: 1V/dev 50µsec/dev
V-sync.
1. Play a cassette which was recorded by the unit in SPmode.
2. Press the PAUSE/STILL button to freeze the picture.3. Look at
the monitor screen and adjust (+) or (–) TRACK-
ING buttons so that the vertical jitter of the picture
isminimized.
4. Play and freeze the self-recorded tape in EP mode andmake
sure vertical jitter of the picture is not noticeable.
Note:1 The FV goes back to the it’s initial state when the unit
is
put into the system controller reset mode due to powerfailure,
etc.In this case, preset the FV once again.
2 Self-recorded tape is a cassette whose program wasrecorded by
the unit being adjusted.
1. Play a cassette which was recorded by the unit in EPmode.
2. Short circuit between TP801 and TP803 on the mainPWB, and
press both CH button (+) and CH button (–) atsame time.
3. Press the tracking buttons (+) or (–) 20 times each tobring
the tracking off center. Make sure that:1) There is nothing unusual
on the playback screen.2) There is nothing unusual in the Hi-Fi
sound (for the Hi-
Fi models only).4. Cancel the short circuit.Note:Self-recorded
tape is a cassette whose program was re-corded by the unit being
adjusted.
5-3 CHECKING OF OFF TRACK
-
32
VC-A565U/H965U
1 0
1 1
1 10
1 1
1 1
1 0
1 0
0 0
1 0
1 0
0 0
1 0
0 0
0 0
1 0
0 0
1 0
1 0
0 0
1 0
S s
enso
rO
pen
Clo
se
Mod
e de
tect
ion
insi
de
sens
or A
1 1 1 0 0 0 0 0 0
Mod
e de
tect
ion
outs
ide
sens
or B
0 1 1 1 1 0 1 1 0
CS
/EJ
ULD
PU
1
PU
2
VS
R
PB
SLO
W
FF
ST
OP
Cam
gra
ph E
25 20 15 10 5 060
120
180
240
300
380
G m
echa
nica
l tim
ing
Mod
e ch
eck
Cam
mar
k
Mod
e de
tect
ion
outs
ide
(D70
9 S
W B
)
Mod
e de
tect
ion
insi
de(D
708
SW
A)
019
.812
8117
923
320
026
528
231
633
4
10.3
5412
.812
CA
/EN
DC
S/E
JU
LP
U1
PU
2V
SR
PB
SLO
WF
FS
TO
P
Mod
e de
tect
ion
outs
ide
Mod
e de
tect
ion
insi
de
S s
enso
r
EJ
UL
PU
PU
2V
SR
PB
SLW
FF
ST
P
0 1 1
0 1 1
0 0 0
0 0 1
0 0
1 or
0
Load
ing
mot
or tu
rns
in r
ever
sedi
rect
ion
and
mas
ter
cam
coun
terc
lock
wis
e.
CA
SS
ET
TE
INS
ER
TIO
N
ST
OP
Cas
sette
inse
rtin
g
Ful
l-lo
adin
g
YE
S
YE
S
YE
S
NO
NO
NO
Unl
oadi
ng
Load
ing
mot
or s
tart
s in
nor
mal
dire
ctio
n an
d m
aste
r ca
m c
ount
ercl
ockw
ise.
Doe
s m
echa
nism
pos
ition
sw
.co
me
off w
ithin
2.5
sec
.?
Are
sta
rt/e
nd s
enso
rs a
t low
leve
lbe
fore
cas
sette
inse
rtio
n ?
Inse
rt c
asse
tte.
Dou
ble
actio
n ra
ck s
lides
.
Dru
m m
otor
sta
rts.
Tap
e lo
adin
g.
Pin
ch r
olle
r co
mes
into
con
tact
.
Cam
sw
itch
is a
t PB
pos
ition
.
Load
ing
mot
or s
top.
Is d
rum
FG
pul
se o
utpu
tted
?
End
End
Cas
sette
is e
ject
ed a
nd lo
adin
gm
otor
sto
ps.
Sta
rt s
enso
r cl
ose.
(Cas
sette
is ju
dged
caug
ht h
alfw
ay.)
(Cas
sette
LE
D o
r so
me
othe
r pa
rtis
judg
ed d
efec
tive.
)
6. M
EC
HA
NIS
M O
PE
RA
TIO
N F
LOW
CH
AR
T A
ND
TR
OU
BLE
SH
OO
TIN
G G
UID
EM
EC
HA
NIS
M O
PE
RA
TIO
N F
LOW
CH
AR
T
* T
his
flow
char
t des
crib
es th
e ou
tline
of t
he m
echa
nism
’s o
pera
tion,
but
doe
s no
t giv
e its
det
ails
.
-
33
VC-A565U/H965U
ST
OP
RE
C/P
LA
YP
LA
Y
ST
ILL
PL
AY
V
SR
VS
R
P
LA
Y
Cap
stan
mot
or tu
rns
coun
terc
lock
wis
e.
Is ta
ke-u
p re
el s
enso
r si
gnal
outp
utte
d ?
End
Pre
ss R
EC
/PLA
Y k
ey.
Pic
ture
app
ears
.
Unl
oadi
ng
Set
cap
stan
mot
or to
sea
rch
spee
d.
End
Pre
ss F
F k
ey.
PL
AY
VS
FR
EC
/PL
AY
ST
OP
Cap
stan
mot
or tu
rns
inre
vers
e di
rect
ion.
Load
ing
mot
or tu
rns
inco
unte
rclo
ckw
ise
dire
ctio
nan
d m
aste
r ca
m c
lock
wis
e.
Slo
w b
rake
com
es in
toco
ntac
t with
cap
stan
mot
or.
Slo
w b
rake
pres
sing
Cam
sw
itch
is a
t ST
ILL
posi
tion.
End
Cap
stan
mot
or s
tops
.
Pre
ss S
TO
P k
ey.
Load
ing
mot
or s
tops
.
End
Sto
p ca
psta
n m
otor
.
NO
YE
S
Pre
ss S
TIL
L ke
y.
Pin
chro
ller
rele
asin
g
Idle
rsw
ingi
ng
Pin
chro
ller
pres
sing
Load
ing
mot
or tu
rns
cloc
kwis
e an
d m
aste
rca
m c
ount
ercl
ockw
ise.
Tur
n ca
psta
n m
otor
inre
vers
e di
rect
ion.
Tur
n lo
adin
g m
otor
coun
terc
lock
wis
e.
Cam
sw
itch
is a
t VS
Rpo
sitio
n.
Set
cap
stan
mot
or to
sea
rch
spee
d.
Is ta
ke-u
p re
el s
enso
r si
gnal
outp
utte
d ?
Pre
ss R
EW
key
.
Rel
ease
pin
ch r
olle
r.
Cam
sw
itch
is a
t PU
2 po
sitio
n.
Cam
sw
itch
is a
t PU
1 po
sitio
n.
Sto
p lo
adin
g m
otor
.
Pre
ss p
inch
rol
ler.
Load
ing
mot
or tu
rns
cloc
kwis
e.
Rel
ease
the
supp
ly a
uxili
ary
brak
e. Sto
p lo
adin
g m
otor
.
End
Unl
oadi
ng
Cam
sw
itch
is a
t PB
pos
ition
.
End
Pre
ss P
LAY
Key
.
Load
ing
mot
or tu
rns
coun
ter-
cloc
kwis
e an
d m
aste
r ca
mcl
ockw
ise.
Cap
stan
mot
or tu
rns
coun
terc
lock
wis
e. P
B s
peed
.
NO
YE
S
-
34
VC-A565U/H965US
TO
P
F
F/R
EW
ST
OP
CA
SS
ET
TE
EJE
CT
FF
/RE
W
S
TO
P
NO
NO
FF
/RE
Wop
erat
ion
Bra
kefu
nctio
n
Tur
n ca
psta
n m
otor
inno
rmal
or
reve
rse
dire
ctio
n,af
ter
the
rem
aini
ng ta
pe h
asbe
en d
etec
ted.
Load
ing
mot
or tu
rns
coun
ter-
cloc
kwis
e.
Cam
sw
itch
is a
t Sto
ppo
sitio
n.
End
Pre
ss S
TO
P k
ey.
Pre
ss F
F/R
EW
key
.
Sto
p ca
psta
n m
otor
.
Load
ing
mot
or s
tops
.
End
Load
ing
mot
or tu
rns
in c
lock
wis
e an
d m
aste
r ca
mco
unte
rclo
ckw
ise.
4 su
pply
ree
l pul
ses
outp
utte
d ?
Doe
s th
e ta
ke-u
pre
el p
ulse
out
put
two
edge
s ?
Cap
stan
mot
or tu
rns
cloc
kwis
e.
Load
ing
mot
or tu
rns
cloc
kwis
e.
Cam
sw
itch
is a
tE
ject
pos
ition
.
Load
ing
mot
orst
ops.
Cap
stan
mot
orst
ops.
Pre
ss E
JEC
T k
ey.
Tap
eun
load
ing
Cas
sette
ejec
t
End
Cap
stan
mot
or tu
rns
cloc
kwis
e.
Cap
stan
mot
or tu
rns
coun
terc
lock
wis
e in
abo
ut2
seco
nds.
Sto
p lo
adin
g m
otor
.
Cap
stan
mot
or tu
rns
in r
ever
se d
irect
ion.
Cam
sw
itch
is a
t UL
posi
tion.
YE
S
YE
S
-
35
VC-A565U/H965U
ME
CH
AN
ISM
TR
OU
BL
ES
HO
OT
ING
1. F
F/R
EW
FA
ILU
RE
(N
O T
AP
E W
IND
ING
)
Pre
ss F
F k
ey.
NO
NO
NO
NO
NO
NO
NO
NO
YE
S
YE
S
YE
S
YE
S
YE
S
YE
S
YE
SY
ES
Is m
aste
r ca
m a
tF
F p
ositi
on ?
Doe
s lo
adin
gm
otor
ope
rate
?
Mod
es c
hang
ing
smoo
thly
thro
ugh
cam
sw
itch
?
Load
ing
mot
orco
ntro
l sys
tem
in tr
oubl
e.
Are
Vco
12V
and
Vcc
5V
app
lied
?
Rep
lace
the
caps
tan
mot
or.
Rep
lace
the
idle
ras
s’y.
Rep
lace
the
reel
sens
or.
Is v
olta
ge a
pplie
dto
load
ing
mot
or ?
Load
ing
mot
or is
dam
aged
. Rep
lace
it. Vol
tage
sup
ply
syst
em in
trou
ble.
Mod
e se
nsor
syst
em in
trou
ble
or m
aste
r ca
mm
alpo
sitio
ned.
Vol
tage
sup
ply
syst
em in
trou
ble.
Doe
s ca
psta
nm
otor
turn
in F
F (
orR
EW
) di
rect
ion
?
Are
idle
r w
heel
ass’
y an
d re
el d
isk
in m
esh
?
Is th
e pu
lse
outp
utte
d fr
om r
eel
sens
or ?
The
cas
sette
tape
is p
resu
mab
lyda
mag
ed.
2. R
EC
/PL
AY
FA
ILU
RE
(M
OD
E R
EL
EA
SE
)
NO
NO
NO
NO
NO
NO
NO
YE
S
YE
S
YE
S
YE
S
YE
S
YE
S
YE
SY
ES
Is th
e m
aste
r ca
mat
PB
pos
ition
?D
oes
load
ing
mot
or o
pera
te ?
Mod
es c
hang
ing
smoo
thly
thro
ugh
cam
sw
itch
?
Load
ing
mot
orco
ntro
l sys
tem
in tr
oubl
e.
Are
Vco
12V
and
Vcc
5V
app
lied
?
Rep
lace
the
caps
tan
mot
or.
Rep
lace
the
idle
ras
s’y.
Rep
lace
the
reel
sens
or.
Is v
olta
ge a
pplie
dto
load
ing
mot
or ?
Load
ing
mot
or is
dam
aged
. Rep
lace
it. Vol
tage
sup
ply
syst
em in
trou
ble.
Vol
tage
sup
ply
syst
em in
trou
ble.
Doe
s ca
psta
nm
otor
turn
?
Are
idle
r w
heel
ass'
y an
d re
el d
isk
in m
esh
?
Is th
e pu
lse
outp
utte
d fr
om r
eel
sens
or ?
Che
ck m
ain
PW
B.
-
36
VC-A565U/H965U
Rep
lace
load
ing
mot
or b
lock
.
3. W
IND
ING
FA
ILU
RE
AT
VS
R4.
UN
US
UA
L S
OU
ND
IN E
AC
H M
OD
E
Is P
layb
ack
func
tion
norm
al ?
Mas
ter
cam
shift
ing
to V
SR
posi
tion
?
Go
to 2
. RE
C/
PLA
Y F
AIL
UR
Ero
utin
e.
Rep
lace
idle
rge
ar a
ss’y
.
Rep
lace
lim
iter
pulle
y as
s’y.
Rep
lace
ree
lse
nsor
.
Go
to 2
. RE
C/
PLA
Y F
AIL
UR
Ero
utin
e.
Are
idle
r w
heel
ass’
y an
d su
pply
reel
dis
k in
mes
h ?
Is s
uppl
y re
el d
isk
win
ding
torq
ueno
rmal
?
Is p
ulse
out
putte
dfr
om r
eel s
enso
r ?
Che
ck m
ain
PW
B.
YE
S
YE
S
YE
S
YE
S
YE
S
NO
NO
NO
NO
NO
YE
S
YE
S
NO
NO
YE
S
Pre
ss R
EW
key
.
4-i)
Unu
sual
sou
nd in
cas
sette
inse
rtio
n an
d ej
ectio
n m
ode
Is u
nusa
l sou
nd h
eard
dur
ing
cass
ette
con
trol
run
ning
?
Unu
sual
sou
nd h
eard
with
pin
chro
ller
leve
r go
ing
up o
r do
wn
?
Is u
nusu
al s
ound
hea
rd d
urin
glo
adin
g/un
load
ing
?
Che
ck p
inch
rol
ler
driv
e ca
m, p
inch
rol
ler
driv
e le
ver
and
reve
rse
guid
e fo
r th
eir
actio
ns.
Rep
lace
dam
aged
one
with
new
one
.
Rep
lace
cas
sette
con
trol
ass
’y.
-
37
VC-A565U/H965U
YE
S
YE
S
NO
NO
NO
NO
YE
S
YE
SR
epla
ce c
apst
an m
otor
.
4-ii)
Unu
sual
sou
nd in
FF
/RE
W m
ode
Is r
eel d
isk
heig
ht a
s sp
ecifi
ed ?
Thr
ust g
ap fo
und
at r
eel d
isk
?
Driv
e sy
stem
out
of c
onta
ct w
ith a
nypa
rt o
n m
ain
PW
B ?
Tur
n ca
psta
n m
otor
by
hand
.U
nusu
al s
ound
hea
rd ?
Che
ck d
rive
syst
em’s
gea
rs fo
rda
mag
e. R
epla
ce d
amag
ed g
ear
with
new
one
.•
Ree
l dis
k•
Lim
iter
pulle
y as
s’y
• Id
ler
whe
el a
ss’y
Che
ck r
eel d
isk
and
mai
n ch
assi
s.A
nd r
epla
ce d
efec
tive
part
s.
Adj
ust r
eel d
isk
heig
ht.
Rea
rran
ge th
e pa
rts
on m
ain
PW
B.
-
38
VC-A565U/H965U
7. T
RO
UB
LES
HO
OT
ING
FL
OW
CH
AR
T N
O.1
No
po
wer
The
fuse
blo
ws
out e
ven
whe
n it
is
repl
aced
with
new
one
.S
ee F
LO
W C
HA
RT
NO
.2
<F
use
blow
n ou
t.>.
YE
S
YE
S
YE
S
YE
S
NO
NO
NO
NO
NO
Is th
e fu
se g
ood?
Is th
e no
rmal
sta
te r
esto
red
whe
n on
ce u
nplu
gged
pow
er c
ord
is
plug
ged
agai
n af
ter
seve
ral
seco
nds?
Che
ck fo
r le
ak o
r sh
ort-
circ
uitin
g of
prim
ary
circ
uit p
art.
(L90
1, D
901~
904,
T90
1, C
906,
R90
4, Q
901~
902,
etc
.)A
re A
T 5
V v
olta
ge li
ne n
orm
al?
Are
AT
44V
, AT
27V
, PC
12V
,no
rmal
?
Che
ck e
ach
rect
ifier
circ
uits
and
sh
ort-
circ
uit o
f sec
onda
ry c
ircui
t.
Is "
H"
leve
l app
lied
at p
in(7
6) o
f IC
701?
Che
ck th
e po
wer
failu
re c
ircui
t. (Q
705)
FL
OW
CH
AR
T N
O.3
Wh
en t
he
ou
tpu
t vo
ltag
e fl
uct
uat
es.
Che
ck w
heth
er th
e se
cond
ary
side
ph
otoc
oupl
er c
ircui
t ope
rate
s no
rmal
ly.
Che
ck th
e ci
rcui
t and
rep
lace
par
ts.
(IC
901,
IC90
3, e
tc.)
NO
YE
SC
heck
whe
ther
the
prim
ary
side
ph
otoc
oupl
er o
utpu
t con
trol
fu
nctio
ns n
orm
ally
.
Che
ck th
e ci
rcui
t and
rep
lace
par
ts.
(IC
901,
IC90
3, Q
902,
T90
1, e
tc.)
NO
YE
S
Rep
lace
IC90
1.
FL
OW
CH
AR
T N
O.2
Fu
se b
low
n o
ut.
Cas
e (1
)C
ase
(2)
Che
ck fo
r le
ak o
r sh
ort-
circ
uitin
g of
pr
imar
y ci
rcui
t par
t.(L
901,
D90
1~90
4, T
901,
C90
6,
R90
4, Q
901~
902,
etc
.)
Che
ck fo
r sh
ort-
circ
uitin
g of
re
ctify
ing
diod
e an
d ci
rcui
t in
each
re
ctify
ing
circ
uit o
f sec
onda
ry c
ircui
t.(D
9334
, D93
1~93
3)
FL
OW
CH
AR
T N
O.4
Wh
en b
uzz
is h
eard
fro
m t
he
vici
nit
y o
f p
ow
er c
ircu
it.
Che
ck fo
r sh
ort-
circ
uitin
g of
circ
uit a
nd r
ectif
ying
dio
de o
f eac
h re
ctify
ing
circ
uit o
f sec
onda
ry
circ
uit a
nd c
heck
for
failu
re o
f shu
nt r
egul
ator
circ
uit.
(D93
34, D
931~
933,
IC90
3, C
935,
C96
3)
-
39
VC-A565U/H965U
FL
OW
CH
AR
T N
O.6
No
op
erat
ion
is p
oss
ible
fro
m t
he
infr
ared
rem
ote
co
ntr
ol.
Ope
ratio
n is
pos
sibl
e fr
om th
e V
CR
, bu
t no
oper
atio
n is
pos
sibl
e fr
om th
e in
frar
ed r
emot
e co
ntro
l.
Is th
e su
pply
vol
tage
of 5
V fe
ed to
pi
n(3)
term
inal
of r
emot
e co
ntro
l re
ceiv
er?
Che
ck A
T 5
V li
nes.
Is "
L" p
ulse
sen
t out
pin
(1)
term
inal
of
rece
iver
whe
n th
e in
frar
ed r
emot
e co
ntro
l is
activ
ated
?
Rep
lace
the
rem
ote
cont
rol r
ecei
ver
or r
epla
ce th
e re
mot
e co
ntro
l tr
ansm
itter
if n
eces
sary
.
Is in
putte
d "L
" pu
lse
to p
in(4
) of
IC
701?
Che
ck li
ne b
etw
een
at r
emot
e co
ntro
l rec
eive
r th
ru to
pin
(4)
of
IC70
1.
YE
S
YE
S
NO
NO
NO
YE
S
Rep
lace
IC70
1.
YE
S
FL
OW
CH
AR
T N
O.7
A c
asse
tte
tap
e is
no
t ta
ke in
.
YE
S
YE
S
YE
S
NO
NO
NO
Che
ck s
tart
sen
sor
shut
ter.
Che
ck li
ne s
tart
sen
sor
and
all t
he
way
up
thru
to p
in(6
7) o
f IC
701.
Che
ck li
ne p
in(7
2) o
f IC
701
and
all
the
way
up
thru
to p
in(1
0) o
f P70
1.
Rep
lace
load
ing
mot
or.
Doe
s pi
n(10
) of
P70
1 go
from
2.5
V
to 4
.2V
whe
n th
e ca
sset
te ta
pe is
in
sert
ed.
Doe
s pi
n(67
) of
IC70
1 ch
ange
from
"H
" to
"L"
leve
l whe
n th
e ca
sset
te
tape
is in
sert
ed?
Are
sta
rt s
enso
r sh
utte
r go
to o
pen
whe
n th
e ca
sset
te ta
pe is
inse
rted
?
NO
NO
NO
FL
OW
CH
AR
T N
O.8
A c
asse
tte
tap
e is
tak
en in
, bu
t ej
ecte
d a
t o
nce
.
Doe
s th
e st
art s
enso
r pu
lse
at
pin(
67)
of IC
701
chan
ge fr
om "
L" to
"H
" le
vel w
hen
the
cass
ette
tape
is
load
ed?
Che
ck s
tart
sen
sor
and
all t
he w
ay
up th
ru to
IC70
1.
Doe
s th
e en
d se
nsor
pul
se a
t pin
(66)
of
IC70
1 ch
ange
from
"L"
to "
H"
leve
l w
hen
the
cass
ette
tape
is lo
aded
?
Che
ck e
nd s
enso
r an
d al
l the
way
up
thru
to IC
701.
Doe
s th
e m
aste
r ca
m m
ode
shift
erop
erat
e no
rmal
ly w
hen
the
cass
ette
ta
pe is
load
ed?
Che
ck c
am s
witc
h an
d al
l the
way
up
thru
to IC
701.
Rep
lace
IC70
1.
YE
S
YE
S
YE
S
-
40
VC-A565U/H965UF
LO
W C
HA
RT
NO
.9
Th
e ca
sset
te t
ape
fails
to
eje
ct.
Doe
s th
e ca
psta
n m
otor
sta
rt w
hen
the
EJE
CT
but
ton
is p
ress
ed?
See
FL
OW
CH
AR
T N
O.1
1.
Doe
s th
e ta
ke-u
p re
el d
isk
turn
whe
nth
e ca
psta
n m
otor
is r
unni
ng?
Che
ck r
eel d
isk
and
reel
driv
e un
it.
Are
pul
ses
appl
ied
at p
in(2
) of
IC70
1 w
hen
the
take
-up
reel
dis
k is
turn
ing?
Che
ck ta
ke-u
p re
el s
enso
r an
d al
l the
way
up
thru
to IC
701.
Doe
s pi
n(10
) of
P70
1 go
from
2.5
V
to 0
.8V
whe
n ve
el p
ules
has
bee
r in
put.
Che
ck p
in(7
2) o
f IC
701.
Doe
s th
e lo
adin
g m
otor
run
? R
epla
ce lo
adin
g m
otor
.
Rep
lace
cas
sette
cam
, gea
r, e
tc.
YE
S
YE
S
YE
S
YE
S
YE
S
NO
NO
NO
NO
NO
YE
S
YE
S
YE
S
NO
NO NO
FL
OW
CH
AR
T N
O.1
0
No
po
wer
is t
urn
ed o
n.
Doe
s po
wer
con
trol
(H)
sign
al a
t pi
n(76
) of
IC70
1 ch
ange
from
"L"
to
"H"
leve
l?
Che
ck IC
701.
Doe
s th
e ba
se o
f Q95
1 ch
ange
from
abou
t 5.0
V to
4.5
V?
Che
ck IC
701
and
all t
he w
ay u
p th
ru
to Q
951.
Is 5
V s
ent o
ut o
f the
em
itter
of
Q95
1?C
heck
Q95
1 an
d th
e A
T 5
V li
ne.
Che
ck p
erip
hera
l circ
uits
for
poor
sold
erin
g.
FL
OW
CH
AR
T N
O.1
1
Th
e ca
pst
an m
oto
r fa
ils t
o r
un
.
Is th
e vo
ltage
mor
e th
an a
bout
2.6
V
DC
giv
en o
ut o
f pin
(24)
of I
C70
1.C
heck
IC70
1.N
O
NO
NO
NO
NO
YE
S
YE
S
YE
S
YE
S
YE
S
Is th
e su
pply
vol
tage
of 5
V fe
ed to
pi
n(3)
of P
701.
Che
ck P
C 5
V li
ne.
Is th
e vo
ltage
mor
e th
an 2
.6V
DC
se
nt in
pin
(9)
of P
701.
Che
ck b
etw
een
pin(
9) o
f P70
1 an
d al
l the
way
up
thru
to p
in(2
4) o
f IC
701.
Is th
e vo
ltage
at p
in(5
) of
P70
1 3.
5V?
Che
ck b
etw
een
the
pin(
71)
of IC
701
and
all t
he w
ay u
p th
ru to
pin
(5)
of
P70
1.
Is th
e su
pply
vol
tage
of 2
3V fe
ed to
pi
n(2)
of P
701.
Che
ck m
otor
-VC
C li
ne a
nd m
otor
vo
ltage
sel
ecto
r ci
rcui
t.
Rep
lace
cap
stan
mot
or.
-
41
VC-A565U/H965U
FL
OW
CH
AR
T N
O.1
2
Th
e d
rum
mo
tor
fails
to
ru
n.
Is th
e vo
ltage
mor
e th
an a
bout
2.6
V
DC
giv
en o
ut o
f pin
(25)
of I
C70
1.C
heck
IC70
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