Page 1
Ñ 2 Ñ
CAUTION
Danger of explosion if battery is incorrectly replaced.
Replace only with the same or equivalent type recommended by
the equipment manufacturer.
Discard used batteries according to manufactureÕs instructions.
ADVARSEL!
Lithiumbatteri - Eksplosionsfare ved fejlagtig hŒndtering.
Udskiftning mΠkun ske med batteri af samme fabrikat og type.
LevŽr det brugte batteri tilbage til leverand¿ren.
ADVARSEL
Eksplosjonsfare ved feilakting skifte av batteri.
Benytt samme batteritype eller en tilsvarende type anbefalt av
apparatfabrikanten.
Brukte batterier katterier kasseres i henhold til fabrikantens
VARNIG
Explosionsfara vid felaktigt batteribyte.
AnvŠnd samma batterityp eller en likvŠrdig typ som rekommenderas
av apparattillverkaren.
Kassera anvŠnt batteri enligt gŠllande fšreakrifter.
VAROITUS
Parist voi rŠjŠhtŠŠ, jos se on virheellisesti asennettu.
Vaihda paristo ainoastaan laitevalmistajan suosittelemaan tyyppiin.
HŠvitŠ kŠytetty paristo valmistajan ohjeiden mukaisesti.
Notes on chip component replacement
¥ Never reuse a disconnected chip component.
¥ Notice that the minus side of a tantalum capacitor may be
damaged by heat.
Flexible Circuit Board Repairing
¥ Keep the temperature of soldering iron around 270ûC
during repairing.
¥ Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).
¥ Be careful not to apply force on the conductor when soldering
or unsoldering.
This appliance is classified as a CLASS 1
LASER product. The CLASS 1 LASER
PRODUCT MARKING is located on the
rear exterior.
The following caution label is located
inside the unit.
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous ra-
diation exposure.
The laser component in this product is
capable of emitting radiation exceeding
the limit for Class 1.
SAFETY-RELATED COMPONENT WARNING !!
COMPONENTS IDENTIFIED BY MARK ! OR DOTTED LINE
WITH MARK ! ON THE SCHEMATIC DIAGRAMS AND IN
THE PARTS LIST ARE CRITICAL TO SAFE OPERATION.
REPLACE THESE COMPONENTS WITH SONY PARTS
WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS
MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.ATTENTION AU COMPOSANT AYANT RAPPORT
Ë LA SƒCURITƒ!!
LES COMPOSANTS IDENTIFIƒS PAR UNE MARQUE ! SUR
LES DIAGRAMMES SCHƒMATIQUES ET LA LISTE DES
PIéCES SONT CRITIQUES POUR LA SƒCURITƒ DE
FONCTIONNEMENT. NE REMPLACER CES COMPOSANTS
QUE PAR DES PIéCES SONY DONT LES NUMƒROS
SONT DONNƒS DANS CE MANUEL OU DANS LES
SUPPLƒMENTS PUBLIƒS PAR SONY.
Page 2
Ñ 3 Ñ
To Exposed Metal
Parts on Set
0.15µF1.5k
W AC
voltmeter
(0.75V)
Earth Ground
SAFETY CHECK-OUT
After correcting the original service problem, perform the follow-
ing safety checks before releasing the set to the customer:
Check the antenna terminals, metal trim, ÒmetallizedÓ knobs, screws,
and all other exposed metal parts for AC leakage. Check leakage as
described below.
LEAKAGE
The AC leakage from any exposed metal part to earth Ground and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microampers). Leak-
age current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA
WT-540A. Follow the manufacturersÕ instructions to use these
instruments.
2. A battery-operated AC milliammeter. The Data Precision 245
digital multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by means of a VOM
or battery-operated AC voltmeter. The ÒlimitÓ indication is 0.75
V, so analog meters must have an accurate low-voltage scale.
The Simpson 250 and Sanwa SH-63Trd are examples of a pas-
sive VOM that is suitable. Nearly all battery operated digital
multimeters that have a 2V AC range are suitable. (See Fig. A)
Fig. A. Using an AC voltmeter to check AC leakage.
MODEL IDENTIFICATION
Ñ BACK PANEL Ñ
Parts No.
4-989-525-1
4-989-525-2
4-989-525-3
4-989-525-4
4-989-525-5
4-989-525-6
4-989-525-7
Parts No. Model
US model
Canadian model
AEP model
UK model
Singapore model
Hong Kong model
Tourist model Product country
MALAYSIA
MALAYSIA
MALAYSIA
MALAYSIA
MALAYSIA
MALAYSIA
JA PA N
TABLE OF CONTENTS
1. SERVICING NOTE
.......................................................... 5
2. GENERAL .......................................................................... 8
3. DISASSEMBLY
3-1. Front Panel ......................................................................... 22
3-2. Back Panel and Main Board ............................................... 23
3-3. Bracket (T), (L) and (R) ...................................................... 24
3-4. BD Board ........................................................................... 24
3-5. SUB Chassis ........................................................................ 25
3-6. Shutter Assembly ................................................................ 25
3-7. Over Write Head ................................................................. 26
3-8. Slider Complete Assembly .................................................. 27
4. TEST MODE ..................................................................... 28
5. ELECTRICAL ADJUSTMENTS ............................... 31
6. DIAGRAMS
6-1. Circuit Boards Location ...................................................... 36
6-2. Block Diagrams
¥ BD Section ....................................................................... 37
¥ Main Section .................................................................... 39
6-3. Printed Wiring Board Ñ BD Section Ñ ............................. 42
6-4. Schematic Diagram Ñ BD Section Ñ ............................... 45
6-5. Schematic Diagram Ñ Main Section Ñ ............................ 49
6-6. Printed Wiring Board Ñ Main Section Ñ .......................... 53
6-7. Schematic Diagram Ñ Panel Section Ñ ............................ 55
6-8. Printed Wiring Board Ñ Panel Section Ñ ......................... 57
6-9. IC Block Diagrams ............................................................. 60
6-10. IC Pin Functions ............................................................... 65
7. EXPLODED VIEWS
7-1. Main Section ....................................................................... 74
7-2. Front Panel Section ............................................................. 75
7-3. Mechanism Deck Section (1) (MDM-3B) .......................... 76
7-4. Mechanism Deck Section (2) (MDM-3B) .......................... 77
8. ELECTRICAL PARTS LIST ........................................ 78
