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R-90GCH
PROCEDURE
LETTER
1) CARRY OUT 3D CHECKS.
2) If the Fuse 1 is blown, replace the power unit.
3) Make a visual inspection of the varistor. Check for burned damage and examine the touch
control transformer with a tester for the presence of layer short-circuit (check the primary coil
resistance which is approximately 275Ω ± 10%). If any abnormal condition is detected, replace
the touch control transformer or power unit.
4) CARRY OUT 4R CHECKS.
2. Follow the troubleshooting guide given below, if indicator does not light up after above check and
repairs are finished.
1) CARRY OUT 3D CHECKS.
2) Disconnect the leads to the primary of the high voltage transformer.
3) Ensure that these leads remain isolated from other components and oven chassis by using
insulation tape.
4) After that procedure, re-connect the power supply cord.
5) Follow the troubleshooting guide given below for repair.
STEPS
6) CARRY OUT 4R CHECKS.
TEST PROCEDURES
OCCURRENCE
1
The rated AC voltage is not present to power
terminal of CPU connecter (CN-D).
2
The rated AC voltage is present at primary
side of low voltage transformer.
COMPONENT TEST
CAUSE OR CORRECTION
Check supply voltage and oven power cord.
Low voltage transformer or secondary circuit defective.
Check and repair.
22
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