MODELS BH2-MJL TROUBLESHOOTING

(FOR ELECTRICAL SYSTEM)

CONTENTS

............................................... A . GENERAL DESCRIPTION f

......................................... B . DEFlNlT ION OF TERMS USED 2 C . PAR'TS LAYOUT ....................................................... 3

.......................... 1 . UYPB74 and Revolving Nosepiece Drive DC Motor 3 .......................................... 2 . UY PB75 and Primary Side P a m 4

D . CIRCUIT DIAGRAMS .............................................. 5

........................................................... 1 . UYPB74 5

........................................................... 2 . UYPB75 6 ...................... E . REVOLVING NOSEPIECE AND ASSOCIATED PARTS 8

1 . Nosepi-doesnotR-e ............................................. 8 ........................................ 2 . Nosapiece d m not stop Retating 9

................................. 3 . Ncsepiece does not Click Stop in Position 9 ...................................... 4 . Lack of Power to Rotate Nosepiece t O

............................... S . Unintended Romtion at Switching On or Off 10 ........................................... 6 . FOOTSW d w not Function 11

F . LAMPS ............................................................... 12

1 . LRlmpdoasnotLight ................... ............ ............ 12 .......................................... 2 . Impossibleto Adjustlntensity 14

................................................ 3 . Lamp Filament Breaks 16 ...................................................... 4 . LampFlickers 16

G . POWER SOURCE ...................................................... 17 .......................... 1 . Equipment does not Operate with Msin SWIM On 17

A. GENERAL DESCRIPTION

1. This troubleshooting guide is written in the form of a flow chart. So, p d with troubleihooting and repair along each srrow mark indicated.

2. In this troubleshooting flow chart, connector terminal numbers and IC pin numbers are enclosed in n =III,191.

3. For example, 5V indicated in + for power check and level J l r k mans to imply that is taken as GND side and 1 as the HOT side. In this case, indicates that 6V is being =fit out to .

4. ICAI used in this troubleshooting guide refers to the suspectad cauae of trouble insofar as the corres- ponding item is concerned.

5. The meter used for this troubleshooting is only the volt-ohm milliammeter {VOM) {e.g. u-70D, etc.)

6. I- marked @ , @ , @ . . . . ouEeide item blmks in the process of checks correspond to the same marks given either to the right of the item blocks or to the right of those on the next page where the details of check are described.

B. DEFINITION OF TERMS USED

2. HOT

3. DC Motor

Q Reference potential in electronic circuits. The potential is OV.

The line which supplies power voltage to "GND" is referred to as "HOT".

+ This refers to a DC motor which starts upon DC power.

4. Primary Side Q This is also known as the input circuit. When two coils, L1 and L2, are linked by mutual inductance M (magnetic coupling), L1 of the input side is called either the primary side or the primary circuit, and L2 is called the secondary side or the secondary circuit.

M

5. Slit

Primary Secondary side

Q This refers to a cut-in point. Here, a part of the light shading plate blocking a transmissive type sensor light is used as slit. This slit allows the transmissive type sensor light to plass through it, thereby turning the sensor on. But i f the slit is too wide, the period of time in which the sensor is on may prolong. Care should therefore be taken as the nosepiece may stop a t a point somewhat away from the click position.

, Slit Motor

This is a connector for inserting an AC cord with a noise filter built in. With this, the noise coming in from the power line can be cut.

4 This refers to the bidirectional thyristor. It is turned on when either a positive or negative pulse is applied to the gate electrode. The application of the triac is the control of the AC power in a broad range of applications from household electric apptiances to industrial equipment where high reliability is called for. Typical uses are in a light adjusting circuit and a temperature control circuit.

Switch

C. PARTS LAYOUT

1. UYP074 and Revolving Nosepiece Drive OC Motor

C

OUK 26X8SA

2. UYPB75 and Primary Side Parts

0. CIRCUIT DIAGRAMS

1. UYPB74

E. REVOLVING NOSEPIECE AND ASSOCIATED PARTS

1. Nosepieoe d~ not Rotate

RIGHT

SW105 J201 JZ02 [ LEFT UYPB75

SWIM

P l O l J107 - XJ30t XJ302

UYP874 J106

Check motor voltage "7V" at both ends of C218 in UYPB75. I t

Check the primary side voltage of AC 9V on transformer Tl Ot (DL052800 IZOOV), DL052900 (200V)) according to

- 0fJ104. 1 nwr

Replace transformer TlOl with a new one and check the operation of the new transformer.

OK! + NO

Replace UYPB76 and check operation.

Does the voltage Mween and 1 of J2M in UYPB75vary as gimn below? Check this with the VOM.

R IGHT SW-ON I -7V 7V I LEFT W-ON I 7V I -7V I

@I. Nosepi- drive SW is defectlw.

2, Motor is defdve. 3. N q i w drive control

circuit of UYP675 is defective.

Replace the SW and check the operation.

Replace UYPS75 I

2. Nosepiece does not Stop Rotating

RIGHT

Wl05 '--

J201 J202 [ LEFT UYPB75

SW1 W

Does continuous rotation stop, in about two seconds?

NO YES +

Replace UY P875 and check operation.

providad on the motor.

@ Replace UY PB75, &just slit I position, and check operation. I

Replace UYP375 B 3. Nosapieee does not Click Stop in Position

@ 1. Position of slit is not correct.

2, Revolver stop signal of UYPB74 Is abnormal.

3. Motor control circuit of UY P875 is dekiive.

@ Refer to the Repair Manual.

RIGHT

SW106 - I J202 [

@ I Adjust the position of the slit pmuidd on the momr. I

LEFT

J105

Replace UYPB74, adjust the slit psition, and check the operation.

wo f OK1 I V 1

UYPBSS is defective

E!b

--

@ I . Slit position is not

UY PB75

correct. 2. Nogepiece stop signal

UYPB74 is abnormal, 3. Motor mnhtml circuit of UYPB75 is defective.

-

Manual

4. Lack of Power to Roam Nosepiem

PI01 RIGHT

XJ301 XJ302 SW I06 - UYPB74

LEFT

MI04

.. Check motor voltage '7V" at both ends of C218 in UYPB75. Adjust RV202 if found abnormal.

NO OK!

I

I Check the raarndaryaide A C ~ ~ V voltage of transformer TI01 I I (DL052800 (100~1, DL052900 (ZWV)) according to

- ofJ104. I 1 R e p l w transformer TI 01 and check operation. I

a K l 1

Replace UY PB75 and Go+ Motor IDM047600) Is check operation.

@ 1. Mww circuit supply voltage is defective.

2. Motor is defective.

6. himendad Rotation at Switching On or Off PI 01

RIGHT XJ301 XJ302

SWlO6 JaOl J202 - UYPB74

LEFT UYP1375

SWIM

JlOS

-. . . . - - .

is defective.

I

6. FOOT-SW does not Function

RIGHT

UYPB75

defective. 2. UYPB75 is defective. 3. Motor is defective.

Is operation made by SW (DY0740001 of the equipment body?

NO YES

t Check the motor drive voltage by means of 3202 of UYPB75 when either the SW of the equipment body

KI

6 4 Check operation after replacing the motor

@ Check motor voltage "7Vr' at both / ( ~ ~ 0 4 7 6 0 0 ) . ends of C218 in UYPB75.

NO

Check operation after replacing

, the FOOT-SW. or FOOT-SW is presed. 1 R l G H T S W 4 ~ m ~ ? m ~ ?

(D LO52800 ( 1 O W ) , OLE2900 t200V)I according

I Replace transformer f 101 and check operation. I 1

Replace UYPB75 LEFT SW-ON

1 I

Replace UYPB75 and check operation.

Check operation after replacing UYPB75.

7v -7v ,

1 Check the condition of the FOOT- on J109 usina the VOM.

Check operation after replacing the FOOTSW.

F. LAMPS

1. Lamp Dam Not light J I M

SWtOl SWlM

HI01 773 (200V Svst:m)

Tl O l

Is rasimnce at both endl of lamp + 0 ohm?

Is AC11.5V coming b w e m W201 and W202.of UY P8761

1 ~eplw the trim and I I

revolving nosepiece drive SW

YES h i Fleplaee transformer TI 01 (DL052800 (100V), DL052900 (200V) and then check operation.

Check the AC cord for electrical @I continuitv.

1 I Replace the AC cord and check I /

Check the AC inlet (DF011800).

OK! NO

Heplace the AC inlet and check operation.

@ Check the main switch SW101 ( D Y ~ S C U I ( ioov) , D Y ~ O O ( 2 0 0 ~ ) .

Replace the main switch and cheek

@ Check the primary voltage select switch SW-102 (DY007500 (100V), DY007600 (200V)I.

OK I NO

Replace the primary voltage select switch and check operation.

OK1

-- -

Replace transformer T I 01 (0 LO52800 (1 OW), DL0529M1(200V)I.

@ 1. Lamp filament burned out. 2. Triac QIOI is defective. 3. Light adjusting circuit of UYPB75 is

defective. 4. Light control is defective. 5. Transformer T l 01 is defective. 6. Primary side is defective.

@ If the resistance value among three terminals of the triac is as shown below, it is okay. It will be easier to make this measurement using W129, W136, and Wt37. "["'I- 80" fzj ; U U G W138 Brown

T i TI G 00

@ Remove J111 and cheek i f the resistance between W140 and W141 smoothly change from 0 ohm to 250 kohms with the light control knob slid.

@ It is satisfactory i f electrical continuity is established between the terminals shown below.

@ When the condition between terminals of AC inlet is checked on the resistance range of t h e VOM it is normal if as given in the table below. ",yf* ......,

c'

@ When the condition between terminals of the main switch is checked on the resistance

2. Impossible to Adjust Intensity

@ When the condition between terminals of the primary voltage select switch is checked on the resistance range of the VOM, it is normal if as given in the table below.

Blue Black Violet

115V I Z W I

'0, - Conductive

'x, - open

@I heck as triac 0101 (~-1. I ( Rsplke the t r ic an: check operation. 1 I

b

Replace UYPB75and check operation.

Adjust the lamp voltage as ckcrlbed in the Repair Manual.

@ 1. tight control knob is defective. 2. Triac 0101 is defective. 3. Light adjusting cirwit of UYPB75 is

dehtive. 4. hmp v o t w is improperly adjusted.

@ RemweJ111 ~ c h e c k i f t h e ~ ~ n c e beween W140 and W141 changes from 0 ohm to 250 kohms with the light control knob slid.

@J tt isokay if thereshncevalue amongthree terminals of the triac is as giwn below. It will b easier to make tfrls measuremen? using W 129, W 136, and W 137.

YT'\-- H ~ T ~ G

136 Brown U L l U -

T,Tz G

Reflected light 5102 04 -- JaW

- Lr-

QlOl RVlOl RVlO2 li&t

3. Lamp Filament Breaks Reflected light J1 SWlOl Sw102 5104 -- J2W

y-%p- (200V System)

UY PB75

TI 01 Q l O l RVlOf RV102 ligh

Check the trim Ql 0 1 (OS0340001. @ 1. Triac 0101 ir dewire. 2. Lamp volcap is improperly

OK I NO

Raplace the triac and check operation.

Adjust the lamp voltage in accordance with the Repair Manual.

OK I No

Replace UYPB75 and adjust the lamp voltage.

adjusted. 3. Li@ adjusting circuit of

UYPB75 is defective. @ It is okay if the resistance value among three

terminals of the triar: is as ggiven below. I t will be easier t o make this adjustment using W129, W136, and W137.

yT'ym H p j E F I T u G ?a Brown

m

T1 T,G

4. Lamp Flickers

SWIOt SWl02

H l O l

(200V System 1 Tl 01

@& I. Lamp making impgdect con- due to dirty mntact in the lamp hwse.

2. Triac QlOf is dektive. 3. Light adjusting cimit of UYPB75 is

faulty.

@ It is okay if the resistance value amang three terminals of the trim is aa given Mow. I t will be mier to make thb mamwment using W129, W136, and W137.

T1 Tz G W1

Replace UYPB76 and adjust the lamp voltage.

G. POWER SOURCE

1. Equipment 0- Not Operate Even With Main Switch ON

UYPB7S

I200V System) T 101

IUI11111 I I V I

NO YES

1

operation. k1

2. Trensformsr Tl 01 is defective. 3. AC inlet Is defectim. 4. Main swi&h h defective. 5. Primaw-side voltage aelm switch is

TlOl &wen J1W and W201.

IW m WI[W Q red 1 W m bleekJ104 m w h i t a ACBV 1M I4] white-W201 blue AC1 I V

@ Check the input voltqe h e e n terminals (blue and violet) of the primary4de voltage and terminal (white) of the main swiw.

a. Can AC 1W3V (AC220V) bemwumd betwen the violet line of the primary- side voltage select switch and terminal 2 {white line) of the main switch when the input voltaga is AC 100V (AC 2MV).

b. Can AC 1 1 SV IAC 240VJ be measured between the blue line of the prirnaw side voltage mielect switch and terminal 2 (white line) of the main switch when the input voltage is AC 11 5V {AC 240V).

@ The power is normal if electrical continuity is established &ween the terminals as

opention.

+ @

Rep@ the primaty-side voltage select switch and heck operation. I I

Check main switch SWl Ol o v m m ( I wv), ovoossoo (awv).

@

OKI NO I

Check primary-side vola* select switch SW102 IDY007M10 (1 WV), DYOO7&00 I2OOV)).

1

Replae the mnsfomer TI 01 and check operation.

Is the wtput of tra;lsforrner Tl01

( Replace UYPB75. I

@

@) When the condition btwem terminals of the AC inlet is checked on the resistance range of the VOM, the power is nwmal if as given in the table below. $76 ~yfmmfmm

c' m, rgJ -. Condwiw

b X O X r ~ A - Open e x X O

@ When the condition between termiwls of the main Mtch was checked on the mist- ance range, the power is normal if as given in the table below.

4 6 6

To1 + Conductive r*, -. - en 'x,- Open

@ When the condition between terminals of the primawside volcagm select swim is checked an the re9imnce ran*, the power is normal if w give in the mbfe belaw.

+

(Dm2m(100v,,D,a, (200V) 1 normal? 4 ON

OFF