Motorola 53H1 Service Manual

Motorola
SERVICE MAN UAL
MODELS
53H1
53H2
53H3
53H4
CHASSIS
HS-337
GENERAL INFORMATION
TYPE - AC-DC tabLe model superheterodyne receiver with
loop antenna.
RECEIVER MODELS
Model Cabinet Color
53H1
Ebony
53H2 Gray
53H3 Green
53H4
Red
TUNING RANGE - 535 to 1620 Kc IF - 455 Kc
TUBE COMPLEMENT Type
F unction
12BE6 Converter
12BA6
IF Amplifier
12AT6 Det, A VC & 1st AF Amp
50C5 Power Amplifier
35W4 Rectifier POWER SUPPLY - 117 volts AC or DC. 35 watts
OPERATING INSTRUCTIONS
ON-OFF-VOLUME. The volume control and power switch
are combined and operated with the volume knob. NOTE:
Reverse the line cord plug in the wall outlet if radio does
not operate from DC. When operating from AC, reversing
the line cord plug in the wall outlet may sometimes improve
reception.
TUNING. Select stations with the tuning knob.
ANTENNA. A built-in loop antenna eliminates the need for
an outside antenna in most locations. When receiving a
weak station, rotate the receiver slightly for best signal
strength. If additional pick-up is necessary, connect an
external antenna to the radio by following the instructions
printed on the rear panel. CAUTION: Never connect the
radio chassis to a water pipe, radiator, or other ground.
SERVICE NOTES
The chassis of this receiver is isolated from the AC
power line circuit by a capacitor to eliminate the shock
hazard when handling the receiver. However, as an addi¬
tional precaution when aligning or servicing the receiver
from AC, an isolation transformer should be inserted be¬
tween the power line and the chassis.
TO REMOVE CHASSIS FROM CABINET:
1. Pull off the two radio control knobs.
2. Remove the four screws which hold the loop to the cabi¬
net.
3. Remove the screw that holds the interlock to the cabi¬
net.
4. Disconnect speaker leads from speaker.
5. Remove the four screws that hold the chassis to the
cabinet.
6. Slide the radio chassis from the cabinet.
LIST APPLICABLE BULLETINS & SUPPLEMENTS HERE:
MOTOROLA, INC. 4 5 4 5 AUGUSTA BLVD. CHICAGO 51, ILLINOIS
Part No.
68P630499 Price 10 Cents
Printed in U.S.A.