Motorola 54X1 Service Manual

MODELS
SERVICE MANUAL
54X1
MAHOGANY
S4X2
IVORY
S4X3
LEAF GREEN
CHASSIS
HS-432
GENERAL INFORMATION
TYPE - AC/DC table model superheterodyne receiver with
plated circuit chassis and loop antenna.
TUBE COMPLEMENT - 12BE6 conv; 12BA6 IF amp; 12AV6
det, AVC, 1st AF amp; 50C5 pwr
amp; 35W4 rect.
TUNING RANGE - 535 to 1620 Kc IF - 455 Kc
POWER SUPPLY - 117 volts AC or DC; 35 watts
SERVICE NOTES
USE OF ISOLATION TRANSFORMER
The chassis of this receiver is connected directly to the
power line, however, the power cord circuit is broken by an
interlock when the cabinet rear cover is removed, When
servicing or aligning this chassis from AC, an isolation
transformer should be inserted between the power line and
the chassis.
NOTES:
1. Reverse the line cord plug in the wall outlet if radio
does not operate from DC. When operating from AC, re¬
versing the line cord plug in the wall outlet may sometime
improve reception.
2. CAUTION: Never connect the radio chassis to water
pipe, radiator, or other ground.
TO REMOVE CHASSIS FROM CABINET
1. Remove screws which hold the back cover and remove
cover completely.
2. Pull off the control knobs and dial pointer from the front
of the receiver.
3. Remove the Phillips head screw under tuning knob, on
the front of the receiver.
4. From the back, remove screw which holds the line cord
interlock plug.
5. Disconnect the speaker leads.
6. From the back, remove screw that mounts the chassis.
7. Remove chassis from the cabinet.
CIRCUIT DESCRIPTION
1. The circuit of this chassis is conventional - there are
no built-in resistors or capacitors. Leads are plated on
both sides of the chassis base, thereby replacing the usual
connecting wires and making wiring more uniform.
2. The metal plating extends through all the holes on the
chassis, connecting circuits on the front with those on the
rear.
3. Reference to the schematic diagram and to chassis will
permit the circuit to be traced easily.
SAFETY PRECAUTIONS
1. Do not service the chassis on a metal plate, because of
the possibility of a short circuit.
2. Use caution when handling the chassis with power ap¬
plied because all high voltage leads are exposed.
3. The outer edges of the chassis and various plated areas
are at ground potential.
COMPONENT REPLACEMENT
1. To prevent tube breakage, remove them before replac¬
ing components. CAUTION: Remove the tubes only by pull¬
ing them straight out. Wiggling a tube may bend a socket
clip causing poor contact with the tube pin.
T. WHEN REMOVING DEFECTIVE COMPONENTS USE
ONLY A SMALL SOLDERING IRON (60 WATTS OR LESS)
TO AVOID DAMAGE TO THE WIRING. DO NOT USE A
SOLDERING GUN. WARNING: THE LEADS ARE VERY
THIN, AND EXCESSIVE HEAT WILL BURN THEM OR
LOOSEN THEM FROM THE BASE MATERIAL.
3. Plated connections or leads, if damaged, may be re¬
placed with a jumper of regular hook-up wire.
4. It is recommended that multiple lug components be re¬
moved by immersing all the lugs simultaneously into a con¬
trolled temperature soldering pot. Motorola Part Number
66T632703. The component may then be lifted off the chas¬
sis easily. If a soldering pot is not available, heat each lug
LIST APPLICABLE BULLETINS & SUPPLEMENTS HERE:
MOTOROLA, INC. 4 5 4 5 AUGUSTA BLVD. CHICAGO 5 1, ILLINOIS
Part No.
68P632396 Price 5 Cents
Printed In U.S.A.