Sony STR-V333ES Service Manual page 5

SAFETY CHECK-OUT
(US model only)
After correcting the original service problem, perform the fol-
lowing safety checks 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
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 2V AC range are suitable. (See Fig. A)
• CHANGE OF BOARDS
Printed wiring boards have been changed.
Printed wiring boards and schematic diagrams of new type, and changed parts list are described in this service manual
NEW TYPE IDENTIFICATION
Model Destination
STR-V333ES US,CND
STR-V444ES US,CND
STR-V555ES US,CND
STR-V555ES AEP,UK,AUS (MY,SP,HK,CIS,EE)
STR-V555ES E2 (PX,EA)
STR-V555ES E3 (PX,EA)
STR-V555ES TW,CH
• Abbreviation
CND : Canadian model
AUS : Australian model
CH : Chinese model
EE : East European model
EA : Saudi Arabia model
SP : Singapore model
TW : Taiwan model
MY : Malaysia model
HK : Hong Kong model
0.15 µF
Fig. A. Using an AC voltmeter to check AC leakage.
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.
FORMER TYPE
Serial number
8,804,451 to 8,806,754
8,806,228 to 8,808,351
8,804,862 to 8,806,241
55,502,861 to 5,504,150
4,400,001 to 4,400,010
3,300,001 to 3,300,209
––––––––––––––––––
Ver 1.2 2002.01
To Exposed Metal
Parts on Set
AC
Voltmeter
1.5 kΩ
(0.75 V)
Earth Ground
NEW TYPE
Serial number
8,806,755 and later
8,808,352 and later
8,806,242 and later
5,504,151 and later
4,400,011 and later
3,300,210 and later
From first production
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