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Parts
Oven lamp
does not
illuminate,
when door
is Open.
or cooking
tray does
not rotate.
Sparking
(or arcing in
cavity)
Microwave
during
cooking
cycle.
Cause
1) Fuse blown out
2) Poor contact of
power cord
3) Lamp blown out
;4) Oven and or
magnetron
thermostat open
5) Defective
cook relay
6) Defective
door opening
monitor switch
1) Defective blower
motor
Blower motor; 2) Defective drive
motor
3) Poor drive of the
roller or turning
shaft
1) Carbonized
dust in oven
1) Too small load of
food
2) Defective
magnetron
thermostat
Table 4
Diagnosis
Check fuse in fuse holder.
Check power cord for continuity.
Also check
power leads are securely wired.
Check lamp.
Lamp does not illuminate, even after replacing
lamp when door is open.
Check continuity for
terminals for thermostat with end-stripped wires by
using multimeter.
If there is no continuity between
terminals, thermostat is defective.
If the terminals A and B of cook relay are electri-
ally not continued when the door is opened, the
relay is defective.
If the door monitor switch is ON condition when
door is open, switch is defect.
If motor does not operate with 220V applied to
motor terminals, motor may be faulty.
Check to see if 220V exists at motor terminals.
If so, motor will be defective.
Check to see if dust lays on roller or —
turning shaft.
| Check if dust lays on spatter
shield or on its support.
If small amount of food is heated for a long time,
microwave is turned off during operation.
Check thermostat terminals for continuity with end
stripped wires by using multimeter.
If there is no
continuity, thermostat is defective.
Replace fuse and
check the parts as
directed on page 29 "2
Fuse is blown out".
Adjust or replace
power cord.
Replace lamp.
Replace thermostat.
Replace.
Replace or adjust.
Replace motor.
Replace drive motor
Clean roller or
turning shaft.
Clean oven cavity.
To increase load,
place a glass of water
in the oven with food.
Replace thermostat.
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