Table Of Contents; Model Identification; Safety Check-Out; Leakage Test - Sony TC-R303 Service Manual

TC-R303
QQ
3 7 63 1515 0
Title Description
Specifications.
Model
Section 1
Location And Function Of Controls.
Section 1. Block
Section 2. Adjustments.
Section 3. Diagrams
3-l. Mounting Diagram.
Schematic Diagram
3-2.
Section 4. Exploded Views And Parts List.
Electrical Parts List
Section 5.
Trouble Checks,
TE
L 13942296513
,
,
SAFETY CHECK-OUT (US Model)
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 microampres).
c u r r e n t c a n b e m e a s u r e d b y a n y o n e o f t h r e e
methods.
www
1.
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 2 4 5 digital multimeter is suitable for
this job.
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TABLE OF CONTENTS

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Identification
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Diagram
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Leakage
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US, Canadian Model: AC: 120 V
Q Q
AEP Model: AC: 220 V ~ 50/60 Hz 20 W
3 6 7 1 3
UK Model: AC: 240 V ~ 50/60 Hz 20 W
!
3. Measuring the voltage drop across a resistor by
means of a VOM or battery-operate d 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
0.15µF
u163
.
Fig.
A. Using an AC voltmeter to check AC leakage.
2 9 9 4 2 8
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60 Hz 20 W
1 5 0 5 8 2 9 9 4
A C
m
voltmeter
(0.75 V)
co
Earth Ground
9 9
2 8 9 9