Sony pcm 7010 service manual

Page 1

SONY;
DIGITAL AUDIO RECORDER

POM-7010

MAINTENANCE MANUAL

1st Edition

Serial No. 800001 and Higher (UC)
Serial No. 600001 and Higher (EK)
Serial No. 100001 and Higher (J)

Page 2

PCM-7010

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 return to chassis, must
not exceed 0.5 mA (500 microampers), Leakage
current can be measured by any one of three
methods.

1. A commercial leakage tester, such as the
Simpson 229 or RCA WT-S40A. Follow the
manufacturers instructions to use these instru-
ments.

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 volt-
meter, The limit indication is 0.75V, 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)

To Exposed Metal
Parts on Set

AC
0.75uF glint / voltmeter
(0.75 V}

"7' Earth Ground

Fig. A. Using an AC voltmeter to check AC leakage.

SAFETY-RELATED COMPONENT WARNING

COMPONENTS IDENTIFIED BY MARK A OR DDTTED
LINE WITH MARK A 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 PUB-
LISHED BY SONY.

ATTENTION AU_COMPOSANT AYANT RAPPORT
A LA SECURITEI

LES COMPOSANTS menrnnés PAR UNE MAROUE Ax
sua LES DIAGRAMMES SCHEMATIOUES ET LA LISTE
DES PIECES soNr CRITIQUES POUR LA sécumré
DE FONCTIONNEMENT. NE REMPLACER ces COM-
POSANTS cue PAR DES PIECES souv DONT LES
NUMEROS sour DONNés DANS cs MANUEL ou
DANS LES supnémems PUBLIES PAR SONY.

(fiatwafil
wnmfieHEfifiietmurgfimfififiaJufior
efirengwsush
$2 - fifiEtEfiwtm.
sfiETevo

Mffizmfine

_2._