Sony dvs 2000 c service manual

Page 2

SAFETY CHECK-OUT

After correcting the original service problem, perform
the following safety checks before releasing the set to
the customer:

Check the 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 ex-
posed metal part having a return to chassis, must not
exceed 3.5mA. Leakage current can be measured by
any one of three methods.

|. A commercial leakage tester. such as the
Simpson 229 or RCA WT-540A. 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 5.25V so
analog meters must have an accurate low-
vnltage 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 20V AC range are
suitable. (See Fig A)

DVS-2000C
828-2010

828-2020

828-2090

BKDS-2010
BKDS-2020
BKDS-2021
BKDS-2022
BKDS-2031
BKDS-2032
BKDS-2041
BKDS-2050
BKDS-2060
BKDS-2061
BKDS-2062
BKDS-207O
BKDS-2071
BKDS-2072

Serial No.
Serial No.
Serial No.
Serial No.
Serial No.
Serial No.
Serial No.
Serial No.
Serial No.
Serial No.
Serial No.
Serial No.
Serial No.
Serial No.
Serial No.
Serial No.
Serial No.
Serial No.

10001 and Higher
10001 and Higher
10001 and Higher
10001 and Higher
10001 and Higher
10001 and Higher
10001 and Higher
10001 and Higher
10001 and Higher
10001 and Higher
10001 and Higher
10001 and Higher
10001 and Higher
10001 and Higher
10001 and Higher
10001 and Higher
10001 and Higher
10001 and Higher

Ta Exposed Metal
Pans on set

AC
voltmeter
(5. 25 V)

o. ISuF I g 1 5k /

._l

'7' Earth Ground

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