TC-R303
TABLE OF CONTENTS
Title
Description
Section
1
Section 1.
Section 2.
Section 3.
3-l.
3-2.
Section 4.
Section 5.
Specifications.
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Model Identification
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Location and Function of Controls.
Block Diagram
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Adjustments.
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Diagrams
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Mounting Diagram.
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Schematic Diagram
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.15
Exploded Views and Parts List.
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Electrical Parts List
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.24
Trouble Checks,
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Page
!
US, Canadian Model: AC: 120 V
60 Hz 20 W
AEP Model: AC: 220 V
~
50/60
Hz 20 W
UK Model: AC: 240 V
~
50/60
Hz 20 W
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SAFETY CHECK-OUT (US Model)
3.
Measuring the voltage drop across a resistor by
After correcting the original service problem,
means of a VOM or battery-operated AC
volt-
perform the following safety check before releasing
meter.
The “limit”
indication is
0.75V,
so
the set to the customer:
analog meters must have an accurate low-
Check the antenna terminals, metal trim, “metallized”
voltage scale. The Simpson 250 and Sanwa
knobs, screws, and all other exposed metal parts for
SH-63Trd are examples of a passive VOM that
AC leakage. Check leakage as described below.
is suitable. Nearly all battery operated digital
multimeters that have a
2V
AC range are
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).
Leakage
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 instru-
ments.
2.
A battery-operated AC
milliammeter.
The Data
Precision
245
digital multimeter is suitable for
this job.
suitable. (See Fig. A)
To Exposed Metal
Parts
on
set
0.15µF
AC
voltmeter
(0.75
V)
4
Earth Ground
1
Fig.
A. Using an AC voltmeter to check AC leakage.
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Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
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