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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. 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.
MODEL IDENTIFICATION
Ñ Back Panel Ñ 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.
Parts No.
3-018-941-0p: US, Canadian model
3-018-941-1p: AEP, UK model
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TABLE OF CONTENTS
1. SERVICING NOTE
........................................................... 4
2. GENERAL .......................................................................... 5
3. DISASSEMBLY
3-1. Case ..................................................................................... 14
3-2. Cassette Window ................................................................. 14
3-3. Mechanism Deck ................................................................ 14
3-4. Cassette Holder Assembly .................................................. 14
3-5. Cassette Compartment Motor (M901), Pulley,
Driving Gear and Slider ...................................................... 15
3-6. Drum Drive Board and Driving Chassis ............................. 15
3-7. Drum ................................................................................... 16
3-8. Capstan Motor (M902) ....................................................... 16
4. ADJUSTMENTS ............................................................ 17
5. DIAGRAMS
5-1. Circuit Boards Location ..................................................... 21
5-2. Block Diagrams
¥ MD Section ...................................................................... 22
¥ Main Section .................................................................... 23
¥ Display/Power Section ..................................................... 25
5-3. Schematic Diagram Ñ MD Section Ñ .............................. 26
5-4. Printed Wiring Board Ñ MD Section Ñ ........................... 29
5-5. Printed Wiring Board Ñ Main Section Ñ ......................... 32
5-6. Schematic Diagram Ñ Main Section (1/3) Ñ ................... 35
5-7. Schematic Diagram Ñ Main Section (2/3) Ñ ................... 38
5-8. Schematic Diagram Ñ Main Section (3/3) Ñ ................... 41
5-9. Printed Wiring Board Ñ Dispaly Section Ñ ..................... 44
5-10. Schematic Diagram Ñ Display Section Ñ ...................... 47
5-11. IC Block Diagrams ........................................................... 49
5-12. IC Pin Functions ............................................................... 53
6. EXPLODED VIEWS
6-1. Case and Back Panel Section .............................................. 59
6-2. Front panel Section ............................................................. 60
6-3. Chassis Section ................................................................... 61
6-4. Cassette Compartment Section ........................................... 62
6-5. Chassis L/R Section ............................................................ 63
6-6. Mechanism Section-1 (DATM-110A) ................................ 64
6-7. Mechanism Section-2 (DATM-110A) ................................ 65
6-8. Mechanism Section-3 (DATM-110A) ................................ 66
7. ELECTRICAL PARTS LIST ........................................ 67 SAFETY CHECK-OUT
After correcting the original service problem, perform the following
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 re-
turn 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 digi-
tal 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 passive 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.
AC
voltmeter
(0.75V) 1.5k W 0.15 mF
Earth Ground To Exposed Metal
Parts on Set
