TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
If the fuse 13A is blown by incorrect door switching replace the defective switch(es) and the fuse 13A.
If the fuse 13A 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.
ITIMER MOTOR (WITH VARI-SWITCH) TEST
6 
CARRY OUT 3D CHECKS before any of the following timer tests.
1 
3 
M
Vari switch
5
2
4
Timer motor with Vari-Switch
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.
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.
| Disconnecting and checking terminals | 5 and 6 |
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| Resistance of motor winding | approximately 11.3 kΩ |
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CARRY OUT 4R CHECKS after any of the above tests. |
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JNOISE FILTER TEST CARRY OUT 3D CHECKS.
Disconnect the leads from the terminals of the noise filter. Using an ohmmeter, check between the terminals as described in the following table.
MEASURING POINT | INDICATION OF OHMMETER |
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Between IN1 and IN2 | Approx. 180 kΩ |
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Between terminal N and WHITE | Short circuit |
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Between terminal L and RED | Short circuit |
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If incorrect readings are obtained, replace the noise filter unit.
IN1
NOISE FILTER |
| IN2 |
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FUSE 13A
LINE CROSS CAPACITOR 0.22∝/ AC125V
VARISTOR 15G / 270 V
DISCHARGE RESISTOR 180 kΩ / 0.5 W
NOISE SUPPRESSION COIL
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LINE BYPASS CAPACITOR |
| LINE BYPASS CAPACITOR | |||
0.0022∝/AC250V |
| 0.0022∝/AC250V | |||
AC1 |
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| AC2 | |
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CARRY OUT 4R CHECKS.
KHIGH VOLTAGE FUSE 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.
CARRY OUT 4R CHECKS.
CAUTION: ONLY REPLACE HIGH VOLTAGE FUSE WITH THE CORRECT VALUE REPLACEMENT.
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