Sensor Detection Test, Probe, Blower - GE SpaceMakerXL JMV1420 Technical Service Manual

SENSOR DETECTION TEST
1. Place 1/3 cup tap water in oven.
2. Touch VEGETABLE (jvm1660), oven starts immediately.
POPCORN (jvm1650)
3. Control beeps and shuts off.
4. Touch CLEAR/OFF
A) Test OK--Normal
B) Test Fails--Check Sensor. (see quick test previous page)
PROBE RECEPTACLE
Receptacle is located on right hand side of cavity. The probe
is a sensor that has a thermistor swagged in the tip of a
stainless steel tube. The probe can be checked by using an
ohmmeter. If inserted into a container of hot water the
resistance will visibly drop.
To remove probe receptacle:
1. Disconnect power, put touch control in service position.
2. Remove black access cover (2 screws).
3. Remove nut from inside cavity.
4. Unplug wiring from smart board and remove.
THE FOLLOWING COMPONENTS REQUIRE
REMOVAL OF MICROWAVE OVEN FROM
INSTALLATION FOR SERVICING.
VENT EXHAUST BLOWER SERVICE
The blower is a two speed (HI-LO) capacitor run blower
assembly located on top of the spacemaker. The blower is
operated by relays located on the smart board.
The blower motor has 3 windings which can be tested for
continuity from the front by removing the top grille and
opening the control panel.
To Test Blower Windings:
1. Disconnect power and remove grille.
2. Open control panel and discharge capacitor.
3. Disconnect two wires to run capacitor. Continuity test
across the two wires should be approximately 75 ohms of
resistance. This test allows you to read across all three
windings at the same time.
To Remove Vent Blower:
1. Remove unit from its installation.
2. Remove 1 screw under damper, and 2 screws on
rear.(1400 series).
3. Remove 1 screw under damper and 1 screw on rear (1600
series).
3. Disconnect blower plug.
NOTE: Place blower wires in routing slots to avoid pinching
of wires.
HANDLE
CABLE
END
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SENSOR