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SA-WS350/WSD35
Ver. 1.4
NOTES ON CHIP COMPONENT REPLACEMENT
•
Never reuse a disconnected chip component.
•
Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
SAFETY CHECK-OUT
After correcting the original service problem, perform the following
safety check before releasing the set to the customer:
Check the antenna terminals, metal trim, "metallized" knobs,
screws, and all other exposed metal parts for AC leakage.
Check leakage as described below.
LEAKAGE TEST
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 microamperes.). 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 manufacturers' 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 "limit" 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 2 V AC range are suitable. (See Fig. A)
To Exposed Metal
Parts on Set
0.15 μF
Fig. A. Using an AC voltmeter to check AC leakage.
SAFETY-RELATED COMPONENT WARNING!
COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE
WITH MARK 0 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
À LA SÉCURITÉ!
LES COMPOSANTS IDENTIFIÉS PAR UNE MARQUE 0 SUR
LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES
PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ DE FONC-
TIONNEMENT. NE REMPLACER CES COMPOSANTS QUE
PAR DES PIÈCES SONY DONT LES NUMÉROS SONT DON-
NÉS DANS CE MANUEL OU DANS LES SUPPLÉMENTS
PUBLIÉS PAR SONY.
3
AC
1.5 kΩ
voltmeter
(0.75 V)
Earth Ground
TABLE OF CONTENTS
1.
2.
2-1. Disassembly Flow ..............................................................
2-2. AMP Block ........................................................................
2-3. AC Cord ............................................................................. 10
2-4. MAIN Board ...................................................................... 11
2-5. POWER Board ................................................................... 12
2-6. KEY Board, Button ............................................................ 13
2-7. MINI JACK Board ............................................................. 14
2-8. BT Module (SW) ............................................................... 15
2-9. FFC Cable (6 Core), FFC Cable (12 Core) ........................ 16
2-10. LED Board, Front Panel Assy (CA1_SW) ........................ 17
2-11. Speaker Unit (CA1_SW) ................................................... 18
3.
3-1. Block Diagram ................................................................... 19
3-2. Printed Wiring Board - MAIN Board - .............................. 21
3-3. Schematic Diagram - MAIN Board (1/4) - ........................ 22
3-4. Schematic Diagram - MAIN Board (2/4) - ........................ 23
3-5. Schematic Diagram - MAIN Board (3/4) - ........................ 24
3-6. Schematic Diagram - MAIN Board (4/4) - ........................ 25
3-7. Printed Wiring Board - MINI JACK Board - .................... 26
3-8. Schematic Diagram - MINI JACK Board - ....................... 26
3-9. Printed Wiring Board - LED Board - ................................. 27
3-10. Schematic Diagram - LED Board - .................................... 27
3-11. Printed Wiring Board - KEY Board -................................. 28
3-12. Schematic Diagram - KEY Board - ................................... 28
3-13. Printed Wiring Board - POWER Board - ........................... 29
3-14. Schematic Diagram - POWER Board - ............................. 30
4.
4-1. Speaker Section .................................................................. 31
4-2. AMP Section ...................................................................... 32
5.
Sony CONFIDENTIAL
For Authorized Servicer
................................................
................................. 33
4
8
9
SYS SET
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