Rectifier/Diode, Thermal Cutouts - GE SpaceMakerXL JMV1420 Technical Service Manual

Checking with a high ohm scale, if the high voltage capaci-
tor is normal, the meter will indicate continuity for a short
time and should indicate an open circuit once the capacitor
is charged. If the above is not the case, check the capacitor
with an ohmmeter to see if it is shorted between either of the
terminals and case. If it is shorted, replace the capacitor.
To Replace Capacitor:
1. Disconnect power. Remove grille.
2. Discharge capacitor and disconnect leads.
3. Remove mounting screw that secures capacitor bracket.
4. Slide mounting bracket out of slot and pull out capacitor.
RECTIFIER/DIODE
The rectifier is located in the upper right hand portion of the
service area next to the capacitor. It can be checked for
continuity in one direction and an open in the opposite
direction (meter must be able to forward bias rectifier). If a
short is indicated in both directions, or if an infinite resis-
tance is read in both directions, the rectifier is probably
defective and should be replaced.
To Replace Rectifier/Diode:
1. Disconnect power. Lower control to service position.
2. Discharge capacitor and disconnect leads to capacitor.
3. Remove mounting screw that secures capacitor bracket
and diode ground screw.
4. Slide mounting bracket out of slot and pull out capacitor/
diode assembly.
5. Remove diode which is mounted to capacitor with one
screw.
THERMAL CUTOUTS (TCO'S)
There are 4 different thermal cutouts in this unit with 4
different purposes.
They are:
1. Oven thermal cutout (flame sensor), on cavity top.
2. Hood thermal cutout, inside control area on duct.
3. Bottom thermal cutout, on floor of control area.
4. Magnetron thermal cutout, on rnagnetron.
OVEN THERMAL CUTOUT (FLAME SENSOR)
The Oven Thermal cutout (Cavity TCO) is located on the top
side of the oven cavity, to the left of the humidity sensor by
the cavity exhaust. The thermal cutout is rated at 212
0
(100 C) and is nonresettable. If thermal cutout opens, look
for cause. If there was a fire in the cavity all wiring must be
inspected to insure that insulation from the wires was not
burned or melted away.
1. Remove screw holding cover and remove cover.
2. Slide cutout from retaining clip and remove wiring.
NOTE: if this cutout opened there would only be power up to
lead from the fuse. Everything behind it would be dead.
HUMIDITY
SENSOR
STIRRER
MOTOR
ALL COMPONENTS REPLACEABLE WITHOUT
REMOVING OUTER CASE
0
F.
BOTTOM THERMAL
CUTOUT
21
WHITE WIRE
TO HV
TRANSFORMER
REMOVE COVER TO
ACCESS STIRRER
MOTOR AND THERMAL
CUTOUT
CAVITY THERMAL
CUTOUT
HOOD FAN
THERMAL
CUTOUT