Motorola 55C3 Panduan Servis - Halaman 2

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BEDTIME CONTROL AND AUTOMATIC OPERATIONS
COMBINED
By combining the bedtime control and automatic radio
operation, it is possible to turn the radio off automatically
and to turn it on again automatically.
Thus, you may go to
sleep at night with music and be awakened with music again
the following morning.
TO USE THIS FEATURE, SET CONTROLS AS FOLLOWS:
1.
Push in AUTO-TIME SET knob (on rear of radio) and
turn in a clockwise
direction until
RADIO ALARM SET
POINTER indicates time radio is to be turned on automati¬
cally.
2.
Turn OPERATION SELECTOR to OFF and then to AUTO
position.
Leave it in AUTO position.
3.
Turn BEDTIME
CONTROL clockwise to any period of
time from 0 to 60 minutes.
4.
Tune in desired station and adjust volume.
APPLIANCE OPERATION
The APPLIANCE OUTLET is located on the rear of the
set. .Coffee-maker, heating pads, lamps, or any other elec¬
trical appliances which operate from 117 volt AC and do not
consume more than 1100 watts may be plugged into the AP¬
PLIANCE OUTLET.
They will turn on automatically with
the radio.
To turn on the
appliance automatically at some pre¬
determined time, follow the AUTOMATIC
CLOCK-RADIO
OPERATION instructions.
The
radio will also come on
with the appliance, serving as a reminder that the appliance
has
been turned
on.
If radio reception is not desired to¬
gether with appliance operation, just turn VOLUME knob to
minimum.
Appliances may also be operated manually, by following
MANUAL RADIO OPERATION instructions. If radio recep¬
tion is not desired with appliance operation, just turn VOL¬
UME knob to minimum.
If radio is to be used alone, be sure to remove appliance
plug from APPLIANCE OUTLET.
SERVICE NOTES
TO REMOVE RADIO CHASSIS FROM CABINET
1.
Remove the four screws which hold the rear cover; dis¬
connect the antenna and appliance outlet leads and remove
the cover.
2.
Pull off the two control knobs from the front of the cabi¬
net.
3.
Remove the Phillips head screw under the tuning knob on
the front of the receiver.
4.
Disconnect the chassis power leads from clock.
5.
Disconnect speaker leads from chassis.
6.
From the back, remove the three screws that mount the
chassis to the cabinet,
7.
Remove the chassis from the cabinet.
TO REMOVE CLOCK FROM CABINET
1.
Remove the two speaker mounting screws and remove
speaker.
2.
Pull off the operation selector knobs on front of cabinet.
3.
Remove the four screws that hold the clock bracket to
the cabinet.
4.
Carefully remove the clock and clock bracket from the
cabinet.
5.
Unsolder
leads
and
remove
the
two
small nuts and
washers mounting the clock to the clock bracket.
CLOCK REPAIR INFORMATION
Duplex timers can be repaired at Duplex Clock Co. , Inc.
29 Cherry Avenue, Waterbury, Connecticut.
The timer should be removed from the radio cabinet and
packed carefully in order that no further damage results in
shipment.
An acknowledgement with a quotation and a request for
payment will be sent to the dealer before the repair is made.
The timer will be returned to the dealer on receipt of pay¬
ment. If the timer is within warranty, repairs will be made
on a no-charge basis.
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.
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.
2.
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 hookup 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
individually with a small soldering iron and shake or brush
off as muchmolten solder as possible. Then, by alternately
heating and loosening each lug, the entire component will be
freed.
5.
An individual tube clip may be removed by squeezing it
it with pliers and then unsoldering it.
The new clip snaps
into the hole.
6.
Resistors or capacitors may be removed by unsoldering
one end at a time.
CAUTION:
Clean all the solder from the holes before in¬
stalling a new component. Do not let the solder run onto an
adjacent lead, as a short circuit will be created.