Table Of Contents; Safety Check-Out; Leakage Test; A. Using An Ac Voltmeter To Check Ac Leakage - Sony PCM-R500 Service Manual

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SAFETY CHECK-OUT

After correcting the original service problem, perform the follow-
ing 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
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 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 pas-
sive VOM that is suitable. Nearly all battery operated digital
multimeters that have a 2 V AC range are suitable. (See Fig. A)
TE
L 13942296513
0.15 µ F
Fig. A. Using an AC voltmeter to check AC leakage.
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
www
SONY PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB-
LISHED BY SONY.
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http://www.xiaoyu163.com
To Exposed Metal
Parts on Set
AC
1.5 k Ω
voltmeter
(0.75 V)
Earth Ground
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TABLE OF CONTENTS

1. General
2. Disassembly
3. Adjustments
4. Diagrams
4-1. Block Diagrams ................................................................. 26
4-2. Printed Wiring Board – RF Section – ................................ 33
4-3. Schematic Diagram – RF Section – ................................... 35
4-4. Printed Wiring Boards – MD Section – ............................. 38
4-5. Schematic Diagram – MD Section – ................................. 41
4-6. Printed Wiring Boards – DIGITAL Section – ................... 45
4-7. Schematic Diagram – DIGITAL Section – ........................ 49
4-8. Schematic Diagram – AUDIO Section – ........................... 53
4-9. Printed Wiring Boards – AUDIO Section – ....................... 57
4-10. Printed Wiring Boards – DISPLAY Section – ................... 61
4-11. Schematic Diagram – DISPLAY Section – ....................... 65
4-12. IC Pin Function Description .............................................. 72
5. Exploded Views
6. Electrical Parts List
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ATTENTION AU COMPOSANT AYANT RAPPORT
LES COMPOSANTS IDENTIFIÉS PAR UNE MARQUE !
SUR LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE
DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ
DE FONCTIONNEMENT. NE REMPLACER CES COM-
POSANTS QUE PAR DES PIÈCES SONY DONT LES
co
NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.
.
– 3 –
9 4 2 8
..................................................................... 4
............................................................ 15
.......................................................... 19
................................................... 83
.................................... 91
0 5 8 2 9 9 4 2 8
À LA SÉCURITÉ!
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