SAFETY CHECK-OUTTABLE OF CONTENTS
After correcting the original service problem, perform the follow-
1. SERVICING NOTE..........................................................4
ing safety checks before releasing the set to the customer:
Check the antenna terminals, metal trim, Ometallized� knobs, screws,
2. GENERAL..........................................................................5
and all other exposed metal parts for AC leakage. Check leakage as
described below.
3. DISASSEMBLY
LEAKAGE3-1. Loading Panel ....................................................................... 7
The AC leakage from any exposed metal part to earth Ground and3-2. Front Panel ........................................................................... 7
from all exposed metal parts to any exposed metal part having a3-3. TC Mechanism Deck ............................................................ 8
return to chassis, must not exceed 0.5 mA (500 microampers). Leak-3-4. CD SW Board , Panel Board................................................. 8
age current can be measured by any one of three methods.3-5. Disc Tray ............................................................................. 9
1. A commercial leakage tester, such as the Simpson 229 or RCA
WT-540A. Follow the manufacturersO instructions to use these4. MECHANICAL ADJUSTMENTS ..........................10
instruments.
2. A battery-operated AC milliammeter. The Data Precision 2455. ELECTRICAL ADJUSTMENTS...............................10
digital multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by means of a 6. DIAGRAMS VOM
or battery-operated AC voltmeter. The Olimit� indica6-1. Circuit Boards Locationtion is 0.75...................................................... 16
V, so analog meters must have an accurate low-v6-2. Brock Diagramsoltage scale.
The Simpson 250 and Sanwa SH-63Trd are examples of a pas-Y Tuner Section ................................................................... 17
sive VOM that is suitable. Nearly all battery operY Deck Sectionated digital.................................................................... 19
multimeters that have a 2V AC range are suitable. (See FY CD Sectionig. A)....................................................................... 21
Y Main Section .................................................................... 23
6-3. Printed Wiring Board NTuner Section N.......................... 25
To Exposed Metal
6-4. Schematic Diagram N Tuner Section N............................ 26
Parts on Set6-5. Printed Wiring Board N Main Section N.......................... 28
6-6. Schematic Diagram N Main Section N ............................ 31
6-7. Schematic Diagram N Deck Section N ............................ 36
6-8. Printed Wiring Board N CD Motor Section N.................. 39
6-9. Schematic Diagram N CD Motor Section N .................... 40
AC
0.15?F1.5kWvoltmeter6-10. Schematic Diagram N CD Section N ............................. 42
(0.75V)6-11. Printed Wiring Board N CD Section N .......................... 45
6-12. Printed Wiring Board N Panel Section N....................... 47
6-13. Schematic Diagram N Panel Section N ......................... 49
6-14. IC Pin Functions ............................................................... 51
Earth Ground6-15. IC Block Diagrams ........................................................... 55
Fig. A. Using an AC voltmeter to check AC leakag7.e. EXPLODED VIEWS
7-1. Case Section ........................................................................ 59
7-2. Front Panel Section 1 .......................................................... 60
7-3. Front Panel Section 2 .......................................................... 61
7-4. Back Panel Section ............................................................. 62
7-5. CD Mechanism Section 1 (CDM38-5BD19)...................... 63
7-6. CD Mechanism Section 2 (CDM38-5BD19)...................... 64
7-7. Base Unit Section (BU-5BD19).......................................... 65
7-8. TC Mechanism Section 1 (TCM-YSW47C24)................... 66
7-9. TC Mechanism Section 2 (TCM-YSW47C24)................... 67
7-10. TC Mechanism Section 3 (TCM-YSW47C24) ................ 68
8. ELECTRICAL PARTS LIST........................................69
SAFETY-RELATED COMPONENT WARNING !!ATTENTION AU COMPOSANT AYANT RAPPORT
� LA S?CURIT?!!
COMPONENTS IDENTIFIED BY MARK ! OR DOTTED LINELES COMPOSANTS IDENTIFI?S PAR UNE MARQUE ! SUR
WITH MARK ! ON THE SCHEMATIC DIAGRAMS AND INLES DIAGRAMMES SCH?MATIQUES ET LA LISTE DES
THE PARTS LIST ARE CRITICAL TO SAFE OPERATION.PIéCES SONT CRITIQUES POUR LA S?CURIT? DE
REPLACE THESE COMPONENTS WITH SONY PARTSFONCTIONNEMENT. NE REMPLACER CES COMPOSANTS
WHOSE PART NUMBERS APPEAR AS SHOWN IN THISQUE PAR DES PIéCES SONY DONT LES NUM?ROS
MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.SONT DONN?S DANS CE MANUEL OU DANS LES
SUPPL?MENTS PUBLI?S PAR SONY.
N 3 N |
ACEC
