Sharp Carousel R-3S56 Manuale di servizio - Pagina 13
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Stampa la paginaPROCEDURE
LETTER
If incorrect readings are obtained, replace the temp. fuse or thermal cut-out.
An open circuit temperature fuse (MAG.) indicates that the magnetron has overheated, this may be due
to resistricted ventilation, cooling fan failure.
An open circuit temperature fuse (OVEN) indicates that the oven cavity has overheated, this may be due
to no load operation.
An open circuit thermal cut-out 95˚C indicates that the fan motor winding has overheated, this may be
due to resisted ventilation or locked cooling fan.
H
MOTOR WINDING TEST
CARRY OUT 3D CHECKS.
Disconnect the leads from the motor.
Using an ohmmeter, check the resistance between the two terminals as described in the table below.
If incorrect readings are obtained, replace the motor.
CARRY OUT 4R CHECKS.
I
FUSE
CARRY OUT 3D CHECKS.
If the fuse is blown when the door is opened, check the 1st latch switch, 2nd latch switch, monitor switch
and monitor resistor.
If the fuse is blown by incorrect door switching replace the defective switch(s) and the fuse.
If the fuse is blown, there is a shorts or grounds in electrical parts or wire harness.
Check them and replace the defective parts or repair the wire harness.
CARRY OUT 4R CHECKS.
CAUTION: Only replace fuse with the correct value replacement.
J
TOUCH CONTROL PANEL ASSEMBLY TEST
The touch control panel consists of circuits including semiconductors such as LSI, ICs, etc. Therefore,
unlike conventional microwave ovens, proper maintenance cannot be performed with only a voltmeter
and ohmmeter.
In this service manual, the touch control panel assembly is in one unit, and troubleshooting by unit
replacement is described according to the symptoms indicated.
1. Tact Switch.
The following symptoms indicate a defective tact switch. Replace the tact switch.
a) When touching the tact switches, a certain tact switch produces no signal at all.
b) When touching the tact switches, sometimes a tact switch produces no signal.
2. Control Panel
The following symptoms may indicate a defective control unit. Before replacing the control unit,
perform the tact switch test (Procedure K) to determine if control unit is faulty.
2-1 In connection with tact switches.
a) When touching the tact switches, a certain group of tact switches do not produce a signal.
b) When touching the tact switches, no tact switches produce a signal.
2-2 In connection with indicators
a) At a certain digit, all or some segments do not light up.
b) At a certain digit, brightness is low.
c) Only one indicator does not light.
TEST PROCEDURES (CONT'D)
Table: Resistance of Motor
Motors
Fan motor
Turntable motor
COMPONENT TEST
Resistance
Approximately 330 Ω
Approximately 12 kΩ
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R-3S56