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8/6/2019 C28xx colorTV Sanyo
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Service Manual EH1 chassis
Colour Television Service Manual
Give complete "SERVICE REF. NO." for parts orderor servicing, it is shown on the rating sheet on thecabinet back of the TV set.
NoteThis TV receiver will not work properly in foreigncountries where the television transmission systemand power source differ from the design specifications.Refer to the specifications for the design specifications
ContentsSafety precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2Circuit description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-7Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8Service adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-13Component locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14-20Special functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21Waveforms & voltages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22-27Service parts listsSchematic diagram
Chassis: EH1-AModel:
C28ER59 [Europe]C28ER59N [Europe]C28ER59NE [UK/Ireland]
For further technical information, please refer to thetraining manual EH1 chassis, ref. No. TI520013.
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-2-Service Manual EH1 chassis
SAFETY PRECAUTION
X-RADIATION PRECAUTION
The primary source of X-RADIATION in the television receiver is the picture tube. The picture tube is speciallyconstructed to limit X-RADIATION emissions. For continued X-RADIATION protection, the replacement tube mustbe the same type as the original including suffix letter. Excessive high voltage may produce potentially hazardousX-RADIATION. To avoid such hazards, the high voltage must be maintained within specified limit. Refer to thisservice manual, high voltage adjustment for specific high voltage limit. If high voltage exceeds specified limits,take necessary corrective action. Carefully follow the instructions for +B1 volt power supply adjustment, and highvoltage adjustment to maintain the high voltage within the specified limits.
PRODUCT SAFETY NOTICE
Product safety should be considered when a component replacement is made in any area of a receiver.Components indicated by mark / /!\ in the parts list and the schematic diagram designate components in whichsafety can be of special significance. It is particularly recommended that only parts designated on the parts list inthis manual be used for component replacement designated by mark /! \ . No deviations from resistance wattageor voltage ratings may be made for replacement items designated by mark /! \ .
1: An isolation transformer should be connected in thepower line between the receiver and the AC line when
a service is performed on the primary of the convertertransformer of the set.2: Comply with all caution and safety-related notes
provided on the cabinet back, inside the cabinet, onthe chassis or the picture tube.
3: When replacing a chassis in the cabinet, always becertain that all the protective devices are installed
properly, such as, control knobs, adjustment covers orshields, barriers, isolation resistor-capacitor networksetc.Before returning any television to the customer,the service technician must be sure that it iscompletely safe to operate without danger of electricalshock.
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-3-Service Manual EH1 chassis
This is a diagram for all models and therefore differs slightly from the actual block diagram.
T u n e r
I F
s t a g e
A 2 s t e r e o
d e c o
d e r
N I C A M
d e c o
d e r
A u d
i o
P r o c e s s o r
3 D
s u r r o u n d
p r o c e s s o r
A u d
i o
o u t p u t
S p e a k e r s
A V s e
l e c t o r
V i d e o
c h r o m a
d e f l e c t
i o n
d e m o d u l a t o r
D o u
b l e
s c a n
c o n v e r t e r
V i d e o
A p e r t u r e
C o n
t r o l
&
M a t r i x
V i d e o
o u t p u t
S y s
t e m
C o n
t r o l
C P U
m e m o r y
t e l e t e x t
d e c o
d e r
H / V s y n c .
d r i v e r
V e r
t i c a l
d r i v e
&
w a v e f o r m
c o n t r o
l l e r
V e r
t i c a l
o u t p u t
H o r
i z o n
t a l d r i v e
& o u
t p u t
I 2 C b u s
D / A
H i g h - v o
l t a g e
C R
T
V o l u m e
B a s s
T r e
b l e
B a l a n c e
M u t e
A V m o d e
I 2 C B u s c o n t r o l
H - C e n
t r i n g
V - C e n
t r i n g
S I F c a r r
i e r
L , R
L , R
L , R
L , R
L , R
L , R
L , R
A V 4 ( F r o n t
)
( S c a r t )
A V 1
A V 4
A V 3
A V 2
Y / C V B S
C
Y
H / V s y n c
R - Y
B - Y
2 Y 2 R - Y
2 B - Y
V D
H D
V D
H - D r i v e
V - d r i v e
D Y
R G B I K
H . V
R G B
C o l o u r
B r i g
h t n e s s
C o n
t r a s
t
T i n t
S h a r p n e s s
CIRCUIT DESCRIPTION
Outline
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-4-Service Manual EH1 chassis
This chassis consists of the tuner, IF detector, audiosignal processor, video signal processor, AV selector,double scan converter, vertical deflection, horizontaldeflection and system control circuit that controls all ofthe circuit on this chassis.The RF(radio Frequency) signal input to the tuner fromthe aerial is converted to the IF(Intermediate Frequency)signal in the tuner stage, and then, the composite video(CVBS) signal and the SIF carrier signal are extracted atthe IF detector circuit.The SIF carrier signal is applied to the A2 stereodemodulator circuit and Nicam stereo demodulator circuitrespectively. The A2 stereo demodulator detects the SIFsignal (5.5MHz=Main channel, 5.74MHz=Sub channel)input, and sends out the A2 stereo audio signals outputto the Nicam decoder circuit, and also judges that thereceiving signal is stereo or monaural, and sends out the
result to the CPU via I 2C bus lines. The Nicam decoderdecodes the SIF signal (5.85MHz components) input andobtains the Nicam stereo audio signals output. This ICalso sends out the status (Nicam or not) to the CPU viathe I 2C bus lines. The obtained A2 stereo or Nicamstereo audio signals are selected by the CPU via the I 2Cbus and supplied to the audio processor circuit as TVaudio signal.
In the video signal processing stage, video signal outputfrom the IF detector circuit is supplied to the AV selectorcircuit as TV video signal. The AV selector circuit selects
the output video signal from the input signal of TV video,scart video and front video signal by the CPU via I 2Cbus. The selected video signal is sent to thevideo/chroma demodulator circuit. The video/chromademodulator demodulates the video signal or Y and Csignal and outputs the colour differential signal R-Y, B-Y,Y, H-sync and V-sync signal and supplies them to thedouble scan converter circuit.The double scan converted Y, R-Y and B-Y signals areapplied to the aperture control and RGB matrix circuit.The RGB original colour signal which are obtained at theRGB matrix circuit drive the video output circuit. Thisvideo output circuit also controls the automatic cut-off byfeeding back the AKB(Auto-Kine Bias) pulse on the RGBsignal during the vertical blanking period to the RGBmatrix and video control circuit.The H-sync and V-sync signals are applied to the H/Vsync driver circuit to generate the drive signals for eachoutput circuit. In the vertical signal control circuit, thevertical sawtooth signal applied to the vertical outputcircuit is waveform-shaped to compensate the rasterdistortion.
On the other hand, the audio processor circuit selects theoutput audio signal from input signals of TV audio, front
audio and scart audio by the CPU via I 2C bus. Theselected audio signals are sent to the 3D surroundprocessing circuit for adding the 3D surround effects.
These signals are again input to the audio processor IC,and are controlled in volume, bass, treble, balance andsound mute by the CPU via I 2C bus. The controlled audiosignals are supplied to the audio output circuit to drivethe loudspeakers.
Main signal flow
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-5-Service Manual EH1 chassis
Tu
Q105
X103SAW
IC101
Q112 Q1231
Q1232
IC1200 Q 1 2 0 4
Q1201Q1207
Q1202Q1208
AV1 AV2 AV3 AV4
IC801
IC202 IC204 IC201
Double ScanConverter
VideoApertureControl &matrix
Q 2 1 1
Q 2 1 2
Q 2 1 3
Q711
Q721
Q731
Q831Q832Q833
IC206
Q 8 3 6
IC711
IC721
IC731
35 8
35 8
35 8
87 21
48
1
9
11
13
33
40
3745
43
25
26
14
13
12
12
34
18192021
1117
V-sync
H-sync
YR-Y
B-Y
Y/CVBS
C
CVBS
Video
V
Y
C
T V - o u t
Video
Video
R-YB-Y
R-YB-Y
1614
1211
R,G,B,BLK
AV2-R,G,B
AV2-BLK
R,G,B
TeletextOSD R,G,B
131211
10
678
15
234
13
11
10 12
IC207
11
BLK
10 12
14
9
5
BLK
H - s y n c
V - s y n c
Y R - Y
B - Y
2Y
2R-Y
2B-Y
R
G
B
IK
BLK
RGB
2324
35343332
M o n
i t o r - o u
t
VR1201
(Front)
30
4.43MHzosc.
IF
CPU
AV Selector
VideoChromaDef.
RGBSW
Video Out
CVBS
Video signal rooting
TuX102
IC101IF
Q10765 22
Q3483Q3484
Q3483Q3484
Q3432
Q3431
5.5MHz
5.74MHz
1
15
8
7
7
8
14
13
16
7
29
8
153
5
9
24
1
2313
115
3
14
8
10
23
18
15
2 4 7 12
1
32
28
30
AV Selector Circuit
BACK BOARD
L R
L
R
L
R
FRONT AV
SCART
IC3431Audio Processor
IC35313D Surround
Processor
IC3521Equaliser
IC001Audio Output
IC3800A2 Stereo
Sound Demo.
IC3401A2 Stereo
FM DecoderIC3451
NICAM Decoder
AF1
AF2
L
R
L
R
RR
L L
R
L
L
R
L
R
SIF carrier
Main
Sub
I2C BUS
I2C BUS
20 14950
1617
From CPU
Audio signal rooting
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-6-Service Manual EH1 chassis
IC1200CXA1855S
BACK BORAD
44AV selector
IC2351CXD2018QP
IC2201AN5390FBS
IC2101AN5395FBP
IC2206LA6393M
IC2203TC74HC123AF
IC2205TC7WH74FU
IC2202TC7W04F
IC2102CXA1315P
IC675
B5V
IC2341MC74HC74AF
IC2351CXD2018QP
IC2361LA6358M
IC801QXXAV8079
IC80224LC04
IC207M74L532P
IC7213CXD2000Q
IC7203 IC7204 IC7205 IC7206
IC7207 IC7208 IC7209 IC7211IC7212 IC7215 IC7221 IC7222IC7223
IC3401TDA9840
IC3800TDA9821
IC3451SAA7283
Tuner IC101LA7577NIC350LA7210
IC2391LA6458M
IC205MC74HC74AN
IC206MC74HC04AN
IC2371LA6458M
IC2381LA6458M
IC7201TLC5733IPM
IC7214QXXAAC2138
5V8V
IC001TA8216H
5V
Q681
RC5V
IC361UPC1377C
IC2311LA6393M
IC2331CXA1315P
IC677
D5V 5V
IC672
A5V 5V
24V
IC7301
5V
IC676
B9V 9V15V
IC674
A12V 12V
P O W E R S U P P L Y
C I R C U I T
Memory
44
39
14
8
14 V-Driver 8
21 8 16 8 8 8
4 4 4H/V sync.det. I2C bus D/A
CPU
59 8 16 8 8VideoSharpness
19 16
I2C bus D/AMatrix&controller
1 2 V
- 1 2 V
SUB DEF. BOARD
VIDEO BOARD
DOUBLE SCAN CONVERTER BOARD
Logic ICs7314,2630,3551,62
8bit A/D converter
30,3242,43 D/A converter
Double scanconverter
14
14
18 14 3,26,36
A2 stereo decoder NICAM stereo decoder
9 9
IF demodulator Sync. detector
FRONT BOARD
C9V 9V
IC678
IC3531MM1369AD
IC3521M5228P
Tuning voltage
IC202TDA9143
IC203LA6393
IC201TDA8601
IC204TDA4665
IC3431TDA9860
Horiz.Drive &Output Circuit
IC673
A8V 8V
35V
IC671
A9V 9V
1 5 V
IC652
A12V 12V
P O W E R S U P P L Y
C I R C U I T
5V
IC711TDA6111Q
IC721TDA6111Q
IC731TDA6111Q
IC653
-12V -12V-16V
137V
IC501LA7846N
High Voltage
CRTHeater
65V
200V
15V
-15V
33V
T403
T402
472
V-Output
66 6
222 Video Output
CRT BOARD
424
7 8 1 6 1, 9
3D surround
Soundcontroller
RGB selectorVideo/chroma/def.
1H delay 1 2 V
- 1 2 V
To Sub Def. Board
Power supply rooting
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-8-Service Manual EH1 chassis
DISASSEMBLY
CABINET BACK DISASSEMBLY
1. Remove 10 screws(A) and 4 screews(B)2. Pull out the cabinet back.
PLACING THE CHASSIS TO SERVICEPOSITION
1. Remove 2 screws (C).2. Release the wires at hooks(D) and hooks(E).3. Remove an AC cord holder(F).4. Turn the chassis to the service position as
shown in the picture.5. Fix the chassis with a screw(C)
(C)
(A)
(B)
(C)(C) (E)
(D)
AC cordholder(F)
(B)
(A)
(A)
(A)
(A) (A)
(A)
(A)
(A)
(A)
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SERVICE ADJUSTMENTS
[After replacing the Menory IC (IC802)]
The memory IC, IC802, stores the service adjustments data for each circuit, therefore, when the memory IC isreplaced, it should be readjusted the following adjustments and confirmed initial data value, refer to the adjustmenttable on next page.
Adjustments Service ModeStereo separation adjustment Item 000, Item 001Vertical Centring Item 005Vertical Height Item 006Horizontal Centring Item 009Horizontal Width Item 010White Balance Item 034, Item 035DCS Gain Item 057Auto Setup Option setting Item 069
Enter to the Service Mode
s Press and hold the Function button on the RC handset and then press the Prog + button on the TV set.
+ To select the adjustment item, use the Prog+ or Prog- button. The selected item is indicated in red.+ To change the service data, use the Level - or Level + button.+ The data which is set in the service mode is stored into the memory IC automatically.
Exit from the Service Mode
s Turn off the TV set by using the Mains switch.
ADJUST DATA
+000 K1 +001+001 K2 -006+003 STID +000
ADJUST DATA
+000 K1 +001+001 K2 -006+003 STID +000
Item service data
Note: Some items of the service adjustments for this chassis are controlled by the CPU, IC801, and theadjustments are carried out by using the RC handset.
-9-Service Manual EH1 chassis
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-10-Service Manual EH1 chassis
Adjust. items Initial value Status Description+000 K1 +000 ADJSTBL Signal level adjustment for A2 stereo, 500mVrms at 54% dev. on pin 1 of SCART 1+001 K2 -006 ADJSTBL Separation adjustment for A2 stereo, minimise R signal on pin 3 of SCART 1+002 STID +000 Fixed Judgement algolizum for A2 stereo, 0: FAST 1:NORMAL 2:FAST -> NORMAL+003 ATT +004 Fixed Sound level adjustment between A2 stereo and NICAM stereo decoded output
+004 VFreq +130 Fixed Not used+005 VCent +086 ADJSTBL Vertical centre adjustment for 50Hz+006 VSize +028 ADJSTBL Vertical size adjustment for 50Hz+007 SCore +010 RECOMD Vertical linearity adjustment (centre, top/bottom part), common data of 50/60Hz+008 VLner +009 RECOMD Vertical linearity adjustment (top and bottom part), common data of 50/60Hz+009 HCent +175 ADJSTBL Horizontal centre adjustment for 50Hz+010 HSize +032 ADJSTBL Horizontal width adjustment for 50Hz+011 PinAmp +023 RECOMD Horizontal pincushion adjustment for 50Hz+012 Tilt +022 RECOMD Trapezoid distortion correction adjustment for 50Hz+013 UCoPin +010 RECOMD Upper corner pincushion adjustment, common data of 50/60Hz+014 LCoPin +010 RECOMD Lower corner pincushion adjustment, common data of 50/60Hz+015 VBow +011 RECOMD Vertical line correction adjustment, common data of 50/60Hz+016 VAngle +007 RECOMD Parallelogram distortion correction adjustment for 50Hz+017 HVCmpV +007 Fixed Vertical size correction due to beam current, common data of 50Hz/60Hz
+018 HVCmpH +007 Fixed Horizontal width correction due to beam current, common data of 50/60Hz+019 VFreq60 +000 Fixed Setting of vertical osc. frequency for 60Hz (Not used)+020 VCent60 -002 Fixed Vertical centre adjustment for 60Hz (difference to ITEM 5)+021 VC16950 +000 Fixed Vertical centre adjustment on 16:9 mode for 50Hz (difference to ITEM 5)+00+022 VC16960 +000 Fixed Vertical centre adjustment on 16:9 mode for 60Hz (difference to ITEM 5)+023 VSize60 +000 Fixed Vertical size adjustment for 60Hz (difference to ITEM 6)+024 VS16950 +000 Fixed Vertical size adjustment on 16:9 mode for 50Hz (difference to ITEM 6)+025 HCent60 +003 Fixed Horizontal centre adjustment for 60Hz (difference to ITEM 9)+026 HCentTX -010 Fixed Horizontal centre adjustment on teletext mode (difference to ITEM 9)+027 HSize60 +002 Fixed Horizontal width adjustment for 60Hz (difference to ITEM 10)+028 PinAmp60 +001 Fixed Horizontal pincushion adjustment for 60Hz (difference to ITEM11)+029 Tilt60 +003 Fixed Trapezoid distortion correction for 60Hz (difference to ITEM12)+030 Colour +023 Fixed Sub colour setting+031 TintAN +069 Fixed Tint setting for AN5390+032 Cont +027 Fixed Sub contrast setting+033 Bright +022 Fixed Sub brightness setting+034 DriveR +152 ADJSTBL R-drive adjustment of white-balance+035 DriveB +160 ADJSTBL B-drive adjustment of white-balance+036 CutofG +050 RECOMD G-cut off adjustment of white-balance+037 CutofR +063 RECOMD R-cut off adjustment of white-balance+038 CutofB +042 RECOMD B-cut off adjustment of white-balance+039 BYGinPA +035 Fixed B-Y gain setting (PAL)+040 RYAnglPA +000 Fixed R-Y angle setting (PAL)+041 MatrxPA +003 Fixed G-Y matrix ratio setting (PAL)+042 BYGinNT +037 Fixed B-Y gain setting (NTSC)+043 RYAnglNT +000 Fixed R-Y angle setting (NTSC)+044 MatrxNT +002 Fixed G-Y matrix ratio setting (NTSC)+045 BYGinSE +037 Fixed B-Y gain setting (SECAM)+046 RYAnglSE +000 Fixed R-Y angle setting (SECAM)+047 MatrxSE +002 Fixed G-Y matrix ratio setting (SECAM)+048 TintSW +009 Fixed Tint setting fro AN5390+049 ABLACL* +000 Fixed ABL/ACL defeat switch and other setting+050 Black +104 Fixed Setting of operational point and gain for black expansion function+051 Gamma +240 Fixed Setting of gamma compensation (o: minimum, 240: maximum)+052 White +032 Fixed Setting of slice level for white peak and adder value to B signal+053 ABL +095 Fixed Setting of ABL operational point and gain+054 ACL +207 Fixed Setting of ACL operational point and gain+055 VMGain +012 Fixed Gain setting of VM+056 SW12 +000 Fixed Y/C delay value setting for AN5390+057 DCSGain +220 ADJSTBL Gain setting of DSC+058 Sharp +004 Fixed Sub sharpness adjustment
+059 DGain +120 Fixed Sharpness setting of small signal part+060 DCore +125 Fixed Coring setting of Dgain+061 DCoreSNR +000 Fixed Change Dcore value according to TDA9143 noise detection (0: No correction)+062 Sepetn +100 Fixed Setting of Dgain and aperture control value
Adjustment Items and data Table
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-11-Service Manual EH1 chassis
+063 Xtal +002 Fixed Xtal setting, 0:3.58+3.58, 1:3.58, 2:4.43, 3:4.43+3.58+064 System +224 Fixed Sub address setting 01 of TDA9134+065 TintTDA +016 Fixed Tint setting of TDA9143+066 YDelyPA +010 Fixed Y/C phase setting for PAL (sub address setting 18 of TDA9143)+067 YDelyNT +010 Fixed Y/C phase setting for NTSC (sub address setting 18 of TDA9143)+068 YDelySE +010 Fixed Y/C phase setting for SECAM (sub address setting 18 of TDA9143)+069 Country +001 ADJSTBL 0: auto search 1: ATS
+070 WideOpt +001 Fixed 0: 16:9 mode off 1: 16:9 mode on+071 TxBrit +040 Fixed Black level setting of teletext mode+072 TxCont +062 Fixed Contrast setting of teletext
Notes:+ The initial value that the CPU writes down the CPU ROM data to the memory when replaced the memory IC. TV
set does not operate correctly with this initial value.+ The items which are shown with fixed in the status column in the table above are preset by factory as standard.
So do not change value otherwise the set may not operate properly.+ The items which are shown with RECOMD are normally not requied for re-adjustment but it may change the value
to implove the performance.+ The items which are shown with ADJSTBL should be re-adjusted following steps.
STEREO SEPARATION ADJUSTMENT1. Enter to the service mode.2. Select item 000 and set data to +000, select item 001
and set data to -006.
VERTICAL CENTRING ADJUSTMENT1. Receive circular pattern.2. Enter to the service mode.3. Select Item 5 and adjust the vertical centre.
VERTICAL HEIGHT ADJUSTMENT1. Receive circular pattern.2. Enter to the service mode.3. Select Item 6 and adjust the vertical height.
HORIZONTAL CENTRING ADJUSTMENT1. Receive circular pattern.2. Enter to the service mode.3. Select Item 9 and adjust the horizontal centre.
HORIZONTAL WIDTH ADJUSTMENT1. Receive circular pattern.2. Enter to the service mode.3. Select Item 10 and adjust the horizontal width.
WHITE BALANCE ADJUSTMENT1. Receive white pattern.2. Enter to the service mode.3. Adjust white balance using the following items,
Item 034 R drive adjustmentItem 035 B drive adjustment
DCS GAIN ADJUSTMENT1. Enter to the service mode.2. Select item 059 and set data to 100.
AUTO SETUP OPTION SETTING1. Enter to the service mode.2. Select item 057 and set data as follows;
Value +000 : Auto search mode for UK and IrelandValue +001 : ATS mode for W. Europe countries.
SERVICE ADJUSTMENTS-1
After replacing the memory IC, IC802, folllowing service adjustments must be carried out.
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-12-Service Manual EH1 chassis
VCO ADJUSTMENT1. Receive the circular pattern.2. Adjust the picture to obtain the best picture by using
T103.
B1 POWER SUPPLY ADJUSTMENT1. Set VR641 to be mechanical centre before pressing
the main switch.2. Receive the circular pattern.3. Set brightness and contrast controls to normal.4. Connect digital V-meter to TP453 on the sub/def.
board.5. Adjust voltage to be 1370.5V DC by using VR641 on
the sub/def. board.
AFT ADJUSTMENT1. Receive the clearest station.2. Adjust AFT to obtain the best picture by using T102.
AGC ADJUSTMENTNOTE: Do not attempt this adjustment with weak signal.1. Receive the clearest station.2. Set AGC VR(VR101) in direction which causes snow
noise to appear, then in the opposite direction untilsnow noise just disappears.
FM DETECTOR ADJUSTMENT(UK/Ireland only)1. Receive the monaural station of system I.2. Connect voltmetre between TPC and TPE.3. Adjust the voltage to be 6.00.2V DC by using T101.
PILOT ADJUSTMENT(Europe only)1. Receive the A2 stereo signal
Carrier :5.5MHz + 5.74MHz
Deviation :27kHz2. Connect oscilloscope between TP34A(pin 5 of IC3401)
and TP34E.3. Adjust the amplitude to be maximum by using T3401.
VIDEO AMPLITUDE ADJUSTMENT(Europe only)1. Receive the PAL colour bar pattern.2. Connect oscilloscope between JT1201(+) and
JT1201E(-) on the back board.3. Adjust the video amplitude to be 1.0Vp-p0.05V by
using VR1201 on the back board.
DOUBLE SCAN ADJUSTMENTReceive the PAL colour bar pattern. Adjustment points
are on the double scan borad.
[PLL ADJUSTMENT]1. Connect oscilloscope between C7226-(TPOSC)(+)
and GND(-).2. Adjust voltage to be 2.5V DC by using T7201.
[CLAMP ADJUSTMENT]1. Connect voltmetre between pin 52 of IC7201(+) and
pin 48 of IC7201(-).2. Adjust voltage to be 2.0V DC by using VR7201.
[OUTPUT LEVEL ADJUSTMENT-Y]1. Connect oscilloscope between pin 6 of K73C(+) and
GND(-).2. Adjust the Y signal amplitude to be 0.7Vp-p by using
VR7351.
0.7Vp-p
2.5V DC
DC=0
1.0Vp-p
100% white level
SERVICE ADJUSTMENTS-2
Please refer to the Component Locations for the adjustments and test points.
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-13-Service Manual EH1 chassis
[OUTPUT LEVEL ADJUSTMENT-R-Y]1. Connect oscilloscope between pin 10 of K73C(+) and
GND(-).2. Adjust the R-Y signal amplitude to be 0.7Vp-p by using
VR7352.
[OUTPUT LEVEL ADJUSTMENT-B-Y]1. Connect oscilloscope between pin 8 of K73C(+) and
GND(-).2. Adjust the B-Y signal amplitude to be 0.7Vp-p by using
VR7353.
SCREEN ADJUSTMENT1. Receive the PAL colour bar pattern.2. Connect oscilloscope between JTP47G(+) and
JTP47E(-) on the CRT unit.3. Adjust colour control to minimum, brightness to centre
and contrast to minimum.4. Adjust the black level to be 165V DC5V by using
SCREEN VR on the FBT.
HIGH VOLTAGE CONFIRMATION1. Receive the white pattern.2. Set brightness and contrast controls to maximum.3. Connect digital V-meter between TP451 and
TP452, and high voltage meter to CRT anode.4. Confirm high voltage to be 28.5 1 KV at beam
current 1.8, and less than 32.5 KV at 0 beam current.
FOCUS ADJUSTMENTBy using FOCUS VR, adjust focus control for welldefined scanning lines.
165V DC
DC=0
Black level
0.7Vp-p
0.7Vp-p
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-14-Service Manual EH1 chassis
MAIN BOARD (Component side)
A 1 0 1
A
I C 1 0 1
IC
I C 2 0 4
IC
I C 2 0 2
IC
I C 3 4 5 1
IC
I C 3 4 0 1
IC
I C 3 8 0 0
IC
I C 2 0 1
IC
S C A N
C ON V E R T E R
U N I T
S
C
N
U
T
I C 2 0 5
IC
K 2 P O
K
PO
K 2 V I
K
V
K 2 P L
K
P
K 2 K K
K
K 2 L K
K2W2WK2Y2Y
I C 3 4 3 1
ICI C 3 5 3 1
ICI C 3 5 0 0
IC
I C 8 0 1
IC
IC3521C3521
I C 6 7 4
I C 6 7 8
T P A
T P E
A 1 0 1
T P D
V R 1 0 1
A G C T 1 0 1
T 1
0 2 I C 1 0 1
T 1 0 3
I C 2
0 4
I C 2 0 2
I C 3 4 5 1
I C 3 4 0 1
I C 3 8 0 0
T P
3 4 A
T 3 4 0 1
I C 2 0 1
I C 2 0 7
I C 6 7 3
S C A N
C ON V E R T E R
U N I T
I C 2 0 5
I C 2 0 6 V I D
E O U N I T
TP2CTP2BTP2A
K 2 P
O
K 2 V I
K 2 P L
K 2 K
K 2 L
K2WK2Y
I C 6 7 7
I C 3 4 3 1
I C 3 5 3 1
I C 3 5 0 0
I C 6 7 1
I C 3 5 0
I C 8 0 2 I C
8 0 1
IC3521
I C 0 0 1
I C 6 7 5
I C 6 7 6
T P
C
T P
3 4 E
I C 2
0 3
A F T
P I L
OT
V C O
A G C
F M
COMPONENTLOCATIONS
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-15-Service Manual EH1 chassis
MAIN BOARD (Circuit side)
A 1 0 1
Q1 0 3 Q1 0 2
Q1 0 1
Q1 0 4
Q1 1 4
Q1 1 5
Q1 1 2
Q1 1 1
Q1 3 1
Q1 0 7
I C 1 0 1
Q2 1 1 Q2 1 2 Q
2 1 3
I C 2 0 2
I C 2 0 4
Q2 1 4
I C 2 0 6
I C 3 4 5 1
Q 3 4 8 3
Q 3 4 8 1
Q 3 4 1 2
Q 3 4 1 1
Q 3 4 8 2
I C 0 0 1
I C 3 5 2 1
Q 3 4 3 1
I C 3 4 3 1
Q 3 4 3 2
I C 3 5 3 1
I C 3 5 0 0
Q 8 7 3
Q 8 5 1 I C
8 0 1 Q 8 0 4
Q 8 0 3
Q 8 0 2
I C 3 8 0 0
I C 3 4 0 1
I C 2 0 1
I C 2 0 7
I C 2 0 5
Q 8 3 5
Q 8 3 6
Q 8 3 1
Q 8 3 2
Q 8 3 3
Q 3 4 8 4
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-16-Service Manual EH1 chassis
I C 6 5 2
V R
6 4 1
Q 6 4 1
Q 6 6 1
Q 6 6 4
D 6 1 5
Q 6 1 1
Q 6 1 2
Q 6 1 3
T 6 1 1
C onv er t er
t r an s .
T 4 0 3
C h ok
e t r an s .
T 4 0 2
F l y b a c k
t r an s .
I C 6 5 3
Q4 2 2
Q4 7 4
I C 5 0 1
V er t i c al
o u t p u t
Q 5 7 2 Q
5 5 5 Q 5 5 4
Q 5 5 6
Q4 6 1
Q4 7 3
Q4 7 2
Q4 7 1
Q4 0 1
H or i z on t al o u t p u t
Q4 3 1
I C 4 3 1
Q4 0 2
LIVE SIDE
+B V
OL T
T P 4 E
T P 4 5 3
T P 4 5 2
T P 4 5 1
S C R E E
N
POWER DEF BOARD (Component side)
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-17-Service Manual EH1 chassis
K23N K23M
J23HW
H-SIZESW
IC2331
IC361
VR391H-OSC
Q2314
Q2312
IC2201
IC2101
IC2203IC2102
IC2206
IC2204
IC2202
IC2205
Q2207
Q2206
Q2204
Q2205
Q1751
Q2202 Q1752
Q1753
Q1755
Q2105Q2106Q2110
Q2109
Q2108 Q2107
Q2161
Q2102 Q2101
Q2103
Q2104
Q2201
K20PL K20VI K20PO
SUB DEF BOARD (Component side)
VIDEO BOARD (Component side)
IC2351
IC2341
IC2311
IC2371 IC2391
IC2381
IC2361
Q2341Q364
Q2313
Q361
Q2311
SUB DEF BOARD (Circuit side)
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-18-Service Manual EH1 chassis
IC7203
IC7204
IC7201
VR7201REF TOP
Q7304Q7338
Q7308
Q7301
Q7307
Q7306
Q7359 Q7355 Q7351
IC7223
IC7206
IC7222
IC2101
Q7360
Q7362 Q7361
VR7353
Q7356
Q7358 Q7357
VR7352
Q7352
Q7354 Q7353
VR7351
IC7215
IC7212
IC7207
IC7214
IC7301
K73AK73CK73B
T7201
CLAMP
PLL
R-Y
B-Y
Y
DOUBLE SCAN BOARD (Component side)
IC7211
IC7208
IC7205 IC7209 Q7201 IC7202
DOUBLE SCAN BOARD (Circuit side)
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-19-Service Manual EH1 chassis
K1001
K1002
K1003
VR1201Video Level
Q1231
Q1232
Q1002Q1205
Q1206Q1203
Q1204Q1202
Q1208
Q1201
Q1207
IC1201
Q1001
K10Y K10W
JT1201
J T 1 2 0 1 E
VIDEO AMP
Q702Q703
Q721
Q701
Q731
Q711
IC711B-OUT
IC721G-OUT
IC731R-OUT
K701
JTP47E
JTP47G
BACK BOARD (Component side)
CRT BOARD (Component side)
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-20-Service Manual EH1 chassis
T 6 0 2
T
T 6 8 1
T
S W
6 0 1
M ai n s S Wi t c h
F 6 0 1
F u s e A 1 9 0 1
S W1 9 0 1
S W1 9 0 2
S W1 9 0 3
S W1 9 0 4
P r o g +P r o g-
V ol +
V ol -
F / MP T
S Y
S
T 6 0 2
T 6 8 1
S W1 9 0
5 S W1 9 0 6
S W1 9 0 7
Q 6 8 2
Q 6 8 8
Q1 1 1 1
Q1 1 2 1
Q1 1 3 1
K 1 1 0 1
K 0 0 1
FRONT BOARD (Component side)
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-21-Service Manual EH1 chassis
This TV set allows you to set up the following specialfunctions.
s Maximum volume setting and prohibition of presetting
ITEM-1Sets the current volume as the maximum volume level and
prohibition of presetting.
SET 0 NOSET 1 YES
s Start up programme position
ITEM-2Presets the programme position when the set is switched on.
SET 0 Last programme position startSET 1 Programme position "1" startSET 2 Programme position "2" startSET 3 Programme position "3" startSET 4 Programme position "4" startSET 5 Programme position "5" startSET 6 Programme position "6" startSET 7 Programme position "7" startSET 8 Programme position "8" startSET 9 "AV1" start
SETTING PROCEDURE
1 Press and hold the button on the Remote controlhandset and then press the Pv button on the TV set .
2To select the "ITEM" number, press the button on
the remote control handset .
3 To select the "SET" number,press the orbutton repeatedly.4 To return to the normal TV mode, press thebutton .
i The setting conditions of all items can be confirmed.i Special functions are not cancelled if the TV set is switched
off or the mains disconnected.i
This mode is not available whilst in the AV mode.
F
ITEM-1 SET->0
SPECIALFUNCTIONS
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-22-Service Manual EH1 chassis
WAVEFORMS & VOLTAGES
On the CRT Boa rd
TP47B
50V/div. 10 s/div.
DC=0V
TP47R
50V/div. 10 s/div.
DC=0V
TP47G
50V/div. 10 s/div.
DC=0V
Q711E 3.6VC 0VB 3.0V
Q721E 3.6VC 0VB 3.0V
Q731E 3.7VC 0VB 3.1V
IC7111 3.3V 2 12.2V 3 3.3V 4 0V 5 6.4V 6 210V 7 138V 8 138V 9 137V
IC7211 3.3V 2 12.1V 3 3.3V 4 0V 5 6.4V 6 210V 7 141V 8 142V 9 140V
IC731
1 3.3V 2 12.1V 3 3.3V 4 0V 5 6.5V 6 210V 7 135V 8 136V 9 134V
On the Main Board(1)
IC0011 1.6V 2 0V 3 0V 4 0V 5 1.5V 6 9.4V 7 13.2V 8 5.0V 9 27.7V
10 0V 11 5.0V 12 12.7V
IC1011 11.1V 2 5.7V 3 6.8V 4 4.6V 5 4.7V 6 4.6V 7 0V 8 3.7V 9 12.1V
10 9.0V 11 4.1V 12 4.2V 13 6.8V 14 7.0V 15 11.2V 16 11.3V 17 4.6V 18 5.3V19 4.7V 20 5.3V 21 5.3V 22 10.1V 23 5.1V 24 2.0V
IC2011 8.1V 2 2.3V 3 2.3V 4 2.4V 5 4.1V 6 3.8V 7 2.3V 8 5.1V 9 0V
10 2.3V 11 2.2V 12 2.2V 13 0.7V 14 1.0V 15 0V 16 0.4V
On the Front Boa rd
Q681E 5.1VC 15.3VB 5.8V
Q682E 5.0VC 5.1VB 5.6V
Q1111E 4.5VC 12.2VB 5.1V
Q1121E 4.5VC 12.2VB 5.1V
Q1131E 4.5VC 12.2VB 5.1V
K7D-6
1V/div. 10 s/div.
DC=0V
K7D-4
50V/div. 10 s/div.
DC=0V
K7D-5
1V/div. 10 s/div.
DC=0V
TPIK
2V/div. 10 s/div.
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-23-Service Manual EH1 chassis
On the Main Board(2)
IC2021 0V 2 2.1V 3 2.4V 4 2.4V 5 4.1V 6 3.8V 7 8.0V 8 5.1V 9 0V
10 1.8V 11 0V 12 3.3V 13 2.6V 14 2.5V 15 0V 16 2.5V 17 0.3V 18 0.7V19 5.1V 20 5.0V 21 5.0V 22 3.3V 23 0.1V 24 4.0V 25 0V 26 3.8V 27 0V28 3.5V 29 5.0V 30 2.5V 31 2.7V 32 0V
IC2031 0V 2 0V 3 0V 4 0V 5 1.1V 6 3.2V 7 0.4V 8 8.0V
IC2041 5.1V 2 0V 3 0V 4 0V 5 7.1V 6 0V 7 4.2V 8 0V 9 5.2V
10 0V 11 2.9V 12 2.9V 13 0V 14 1.4V 15 0V 16 1.3VIC205
1 5.1V 2 0V 3 0.2V 4 5.0V 5 0V 6 5.0V 7 0V 8 5.1V 9 0V10 5.0V 11 0.2V 12 0V 13 5.1V 14 5.1V
IC2061 4.8V 2 0.2V 3 0.2V 4 4.8V 5 4.8V 6 0.2V 7 0V 8 5.0V 9 0V
10 4.8V 11 0.3V 12 5.0V 13 0V 14 5.1V
IC2071 0V 2 0V 3 0.1V 4 0V 5 4.8V 6 0V 7 0V 8 0.9 9 1.2V
10 0V 11 0.9V 12 0V 13 1.2V 14 5.1V
IC3501 9.9V 2 9.4V 3 9.4V 4 5.7V 5 0V 6 9.6V 7 0.3V 8 10.8V 9 12.1V
10 0V
IC671 IC672 IC6731 14.9V 2 0V 3 9.0V 1 8.1V 2 0V 3 5.1V 1 11.1V 2 0V 3 8.0V
IC674 IC675 IC6761 15.2V 2 0V 3 12.2V 1 9.1V 2 0V 3 5.1V 1 12.3V 2 0V 3 9.1V
IC6781 12.1V 2 0V 3 9.2V
IC8011 0.6V 2 0V 3 0V 4 0.6V 5 5.0V 6 5.0V 7 5.1V 8 0.1V 9 2.5V
10 0.6V 11 3.7V 12 3.1V 13 0V 14 0.1V 15 5.2V 16 5.1V 17 0.1V 18 0V19 5.1V 20 3.3V 21 0.1V 22 0V 23 2.1V 24 0.1V 25 2.0V 26 2.5V 27 0V28 0V 29 5.0V 30 0V 31 2.1V 32 0V 33 0V 34 0V 35 0V 36 0.3V37 0.1V 38 5.0V 39 5.0V 40 0.1V 41 2.4V 42 2.7V 43 0V 44 5.1V 45 4.6V46 0V 47 5.0V 48 5.0V 49 4.1V 50 3.6V 51 5.1V 52 5.1V
IC8021 0V 2 0V 3 0V 4 0V 5 5.1V 6 5.1V 7 0V 8 5.1V
IC34011 3.8V 2 3.4V 3 2.7V 4 2.7V 5 2.6V 6 2.6V 7 2.5V 8 2.5V 9 2.6V10 2.5V 11 2.5V 12 2.5V 13 2.5V 14 2.5V 15 2.5V 16 0V 17 2.5V 18 5.1V19 3.4V 20 4.0V
IC34311 4.1V 2 0.1V 3 4.0V 4 8.1V 5 4.0V 6 8.0V 7 4.0V 8 0V 9 4.0V
10 4.0V 11 4.0V 12 4.0V 13 4.0V 14 4.0V 15 4.0V 16 4.0V 17 3.7V 18 4.0V19 4.0V 20 4.0V 21 4.0V 22 4.0V 23 4.0V 24 4.0V 25 0V 26 4.0V 27 4.0V28 4.0V 29 4.0V 30 4.0V 31 0.1V 32 4.0V
IC34511 0V 2 2.4V 3 5.0V 4 0V 5 2.5V 6 2.5V 7 2.6V 8 2.5V 9 0V
10 0V 11 2.5V 12 0V 13 0V 14 0V 15 2.5V 16 2.5V 17 2.5V 18 4.8V19 0V 20 2.5V 21 2.6V 22 2.5V 23 2.5V 24 0V 25 2.6V 26 5.0V 27 2.5V
28 2.5V 29 2.5V 30 2.6V 31 2.5V 32 2.3V 33 2.5V 34 2.5V 35 2.5V 36 5.1V37 0V 38 5.1V 39 4.3V 40 3.6V 41 2.6V 42 0V 43 0.9V 44 0V 45 2.6V46 5.0V 47 4.7V 48 0.9 V 49 4.0V 50 4.0V 51 5.0V 52 0V
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-25-Service Manual EH1 chassis
On the Powe r/ Def. Boa rd
IC652 IC6531 15.7V 2 0V 3 12.2V 1 0V 2 -15.6V 3 -12.0V
IC5011 0V 2 -14.3V 3 0V 4 13.1V 5 0V 6 0V 7 0.8V 8 -12.2V 9 0V
10 0V
Q401E 0VC 32.0VB 0.5V
Q402E 0VC --B -1.6V
Q422E 2.1VC 12.3VB 2.8V
Q471E 0VC 11.8VB 0.6V
Q472E 12.5VC 0VB 0.7V
Q474E 0VC 0.1VB 0.7V
Q554E 0VC 51.7VB 0V
Q421E 135VC 57.4VB 134.5V
Q555E 53.8VC 13.2VB 0V
Q556E 54.7VC 13.2V
B 53.8V
Q572E 0VC 0V
B 0.6V
Q612E -0.2VC 0V
B -0.2V
Q613E 0VC --
B 0V
Q661E 0VC 5.3V
B 0V
Q611E 7.9VC -0.4V
B 7.5V
Q664E 0VC 37.8V
B 0.1V
Q641E 6.4VC 37.8V
B 7.0V
Q612-C
1V/div. 10 s/div.
Q613-C
200V/div. 10 s/div.
Q402-C
10V/div. 10 s/div.
Q401-C
250V/div. 10 s/div.
Q472-E
5V/div. 2ms/div.
IC501-pin3
10V/div. 2ms/div.
Q611-C
1V/div. 10 s/div.
On the Sub/ Def. Boa rd(1)
IC3611 8.0V 2 2.4V 3 3.8V 4 7.0V 5 7.0V 6 - 7 - 8 - 9 0V10 0.8V 11 13.1V 12 0.2V 13 0.2V 14 0V 15 0V 16 0V 17 4.0V 18 6.8V19 4.1V 20 0V 21 12.0V 22 3.7V
IC23311 0.7V 2 0V 3 0.3V 4 0.4V 5 4.0V 6 3.3V 7 0.4V 8 0V 9 0V
10 0V 11 9.1V 12 9.1V 13 9.1V 14 4.0V 15 4.1V 16 9.1V
Q361E 0VC 0.5VB 0.7V
Q364E 0.2VC 12.0VB 0.2V
Q2312E 0VC 1.6VB 0.2V
Q2313E 0VC 6.3VB 0V
Q2314E 0VC 0.9VB 0.4V
Q2311E 0VC 5.1VB -1.8V
Q2341E 0VC 4.5VB 0.1V
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-26-Service Manual EH1 chassis
On the Sub/ Def. Board(2)
IC361-pin1
2V/div. 10 s/div.
DC=0V
IC361-pin3
2V/div. 10 s/div.
DC=0V
IC361-pin10
2V/div. 10 s/div.
DC=0V
IC361-pin12
5V/div. 2ms/div.
DC=0V
IC361-pin18
2V/d iv. 2ms /d iv.
DC=0V
IC361-pin19
2V/d iv. 2ms /d iv.
DC=0V
IC2311-pin7
5V/div. 5 s/div.
DC=0V
IIC2361-pin7
0.5V/div. 2ms/div.
DC=0V
IC2371-pin1
5V/div. 2ms/div.
DC=0V
IC2371-pin7
1V/div. 2ms /d iv.
DC=0V
IC2381-pin1
5V/d iv. 2ms /d iv.
DC=0V
IC2381-pin7
0.5V/div. 2ms/div.
DC=0V
IC2391-pin1
2V/d iv. 2ms/d iv.
DC=0V
IC2391-pin7
2V/div. 10 s/div.
DC=0V
On the Video Board
IC21021 0V 2 0.1V 3 3.7V 4 0V 5 4.5V 6 3.3V 7 7.6V 8 0V 9 0.1V
10 0.1V 11 0V 12 9.1V 13 9.1V 14 3.8V 15 4.2V 16 9.1V
IC22021 0.4V 2 0.4V 3 0.4V 4 0V 5 4.7V 6 4.7V 7 4.7V 8 5.1V
IC22031 0V 2 5.1V 3 5.1V 4 5.1V 5 0.2V 6 0V 7 5.0V 8 0V 9 0.1V
10 0V 11 5.1V 12 5.0V 13 0.1V 14 0V 15 5.0V 16 5.0V
IC22061 1.2V 2 0V 3 0V 4 0V 5 0.1V 6 2.2V 7 0.1V 8 0V
Q2101E 5.1VC 9.1VB 5.7V
Q2102E 5.1VC 9.1VB 5.7V
Q2104E 5.0VC 9.1VB 5.6V
Q2105E 4.1VC 9.1VB 4.8V
Q2106E 4.1VC 9.1VB 4.9V
Q2107E 3.6VC 0VB 3.1V
Q2108E 2.9VC 9.1VB 3.5V
Q2103E 5.0VC 9.1VB 5.6V
Q2109E 3.6VC 9.1VB 4.3V
Q2110E 3.8VC 7.4VB 4.4V
Q2111E 6.9VC 9.1VB 7.5V
Q2201E 4.3VC 9.1VB 5.1V
Q2203E 0VC 0.6VB 0.2V
Q2112E 4.3VC 9.1VB 4.8V
Q2204E 9.1VC 0VB 5.6V
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-27-Service Manual EH1 chassis
On the Back Board
IC12011 4.5V 2 4.5V 3 4.5V 4 4.5V 5 4.5V 6 0V 7 4.5V 8 4.5V 9 4.5V
10 4.5V 11 4.5V 12 0V 13 4.5V 14 4.5V 15 4.5V 16 4.5V 17 4.5V 18 0V19 4.1V 20 3.7V 21 0V 22 4.5V 23 4.5V 24 4.5V 25 4.5V 26 4.5V 27 4.5V28 4.5V 29 4.5V 30 4.5V 31 4.5V 32 4.5V 33 4.5V 34 0V 35 4.5V 36 0V37 4.5V 38 4.5V 39 4.5V 40 4.5V 41 4.5V 42 4.5V 43 4.5V 44 9.0V 45 4.5V46 4.5V 47 4.5V 48 4.5V
Q1001E 0.6VC 0VB 0V
Q1002E 3.9VC 9.1VB 4.5V
Q1201E 3.8VC 9.0VB 4.5V
Q1202E 3.8VC 0VB 4.5V
Q1203E 5.1VC 9.0VB 3.0V
Q1204E 4.5VC 9.0VB 5.1V
Q1205E 6.1VC 9.0VB 5.1V
Q1003E 6.6VC 9.0VB 7.4V
Q1206E 7.5VC 9.0VB 5.6V
Q1207E 2.6V
C 0VB 1.9V
Q1208E 2.6V
C 0VB 1.9V
Q1232E 4.0V
C 9.0VB 4.6V
Q1231E 4.0V
C 9.0VB 4.7V
IC1201pin47
0.2/div. 20 s/div.
IC1201-pin43
0.5/div. 20 s/div.
IC1201-pin40
0.5/div. 20 s/div.
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