T C - R 3 0 3
TABLE OF CONTENTS
Title
Description
Section 1
Section 1.
Section 2.
Section 3.
3-l.
3-2.
Section 4.
Section 5.
Specifications.
. . . . . . . . . . . . _
Model Identification
. . . . . . . . . .
Location and Function of Controls.
Block Diagram
. . . . . . . . . . . . . . .
Adjustments.
. . . . . . . . . . . . . . . .
Diagrams
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1
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2
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3
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5
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.ll
Mounting Diagram.
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12
Schematic Diagram
............ . . . . . . . . . .
.15
Exploded Views and Parts List.
.... . . . . . . . . . . . .
19
Electrical Parts List
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.24
Trouble Checks,
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
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Page
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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
,
, ,,
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-operate
volt-
perform the following safety check before releasing
meter. The “limit” indication is 0.75V, so
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
Check leakage as described below.
is suitable. Nearly all battery operated digital
multimeters that have a 2V AC range are
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
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.
1.
A c o m m e r c i a l l e a k a g e t e s t e r , s u c h a s t h e
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.
suitable. (See Fig. A)
To Exposed Metal
Parts on set
0.15µF
A C
voltmeter
(0.75 V)
Earth Ground
Fig.
A. Using an AC voltmeter to check AC leakage.
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