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R-209(SL)
R-209(W)
10
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
I
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.
terminals as described in the table below.
Table: Resistance of Motor
Motors
Resistance
Fan motor
Approximately 400
Ω
Turntable motor
Approximately 14.5 k
Ω
If incorrect readings are obtained, replace the motor.
CARRY OUT 4R CHECKS.
CARRY OUT 4R CHECKS.
J
HIGH VOLTAGE FUSE F2 TEST
CARRY OUT 3D CHECKS.
If the high voltage fuse is blown, there could be a short in the high voltage rectifier or the magnetron.
Check them and replace the defective parts and the high voltage fuse.
If the high voltage fuse is blown, there could be a short in the high voltage rectifier or the magnetron.
Check them and replace the defective parts and the high voltage fuse.
CARRY OUT 4R CHECKS.
CAUTION: ONLY REPLACE HIGH VOLTAGE FUSE WITH THE CORRECT VALUE REPLACE-
MENT.
CARRY OUT 3D CHECKS before any of the following timer tests.
TIMER SWITCH- CONTACTS
Disconnect the leads from terminals described at following table. Connect an ohmmeter across
terminals described at following table.
Advance the timer and check that a short circuit reading is obtained on the meter.
Turn the timer back to the zero (0) position and check that an open circuit reading is obtained on the
meter. If these readings are not obtained then replace the timer.
Disconnect the leads from terminals described at following table. Connect an ohmmeter across
terminals described at following table.
Advance the timer and check that a short circuit reading is obtained on the meter.
Turn the timer back to the zero (0) position and check that an open circuit reading is obtained on the
meter. If these readings are not obtained then replace the timer.
Disconnecting and checking terminals
1 and 2
TIMER - MOTOR
Disconnect the leads from terminals described at following table. Connect an ohmmeter across the
timer motor winding, terminals are described at following table, and check that a reading of resistance
described at following table is indicated.
If this reading is not obtained then the timer is probably defective and should be replaced.
Disconnect the leads from terminals described at following table. Connect an ohmmeter across the
timer motor winding, terminals are described at following table, and check that a reading of resistance
described at following table is indicated.
If this reading is not obtained then the timer is probably defective and should be replaced.
Disconnecting and checking terminals
3 and 4
Resistance of motor winding
approximately 22.2 kohms
CARRY OUT 4R CHECKS after any of the above tests.
K
TIMER MOTOR TEST
L
CONTROL UNIT TEST
CAUTION: DO NOT TOUCH THE ELECTRICAL PARTS AND THE PRINTED WIRING BOARD
TO PREVENT AN ELECTRIC SHOCK. BECAUSE THE CONTROL UNIT IS “
TRANSLESS CIRCUIT ” AND ALL ELECTRICAL PARTS ARE USED AT A.C. LINE
VOLTAGE.
TRANSLESS CIRCUIT ” AND ALL ELECTRICAL PARTS ARE USED AT A.C. LINE
VOLTAGE.
The control unit consists of circuits including semiconductors such as LSI, etc. Therefore, unlike
conventional microwave ovens, proper maintenance can not be performed with only a voltmeter and
ohmmeter.
conventional microwave ovens, proper maintenance can not be performed with only a voltmeter and
ohmmeter.
M
4
2
3
1
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