Gas Sensor Test, Sensor Test - GE SpaceMakerXL JMV1420 Technical Service Manual

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SENSOR
The sensor is a plug-in device located in the air exhaust
duct, behind the grille on the left side.
To Service:
1. Remove grille.
2. Separate retainer from receptacle and unplug sensor.
GAS SENSOR TEST
Microwave sensor cooking uses a special gas sensor which
detects both humidity (steam) and hydrocarbons (food
odors) during the cooking process.
Checking the initial sensor cooking condition:
1. The oven should be plugged in at least five minutes
before sensor cooking.
2. Room temperature should not exceed 95'F (350C).
3. The unit should not be installed in any area where heat
and steam are generated, for example, next to a conven-
tional surface unit.
4. Exhaust vents are provided on the back of the unit for
proper cooling and air flow in the cavity. To permit adequate
ventilation, be sure to install so as not to block these vents.
There should be some space for air circulation.
5. Be sure the exterior of the cooking container and the
interior of the oven are dry. Wipe off any moisture with a dry
cloth or paper towel.
6. The Sensor works with food at normal storage tempera-
ture. For example, chicken pieces would be at refrigerator
temperature and canned soup at room temperature.
7. Avoid using aerosol sprays or cleaning solvents near the
oven while using Sensor settings. The sensor will detect the
vapor given off by the spray and turn off before food is
properly cooked.
8. After about 2 to 9 minutes if the sensor has not detected
the vapor of the food, ERROR will appear and the oven will
shut off.
SENSOR TEST (QUICK TEST)
1. With 2 fingers touch and hold the following pads at the
same time:
7 and 8
2. Observe diagnostic number in display (numbers approxi-
mate)
* 15-185 (Normal -verify with "detection test")
* 213 or higher (Sensor failed open, sensor unplugged,
wiring, or.smart board)
* Less then 6 (shorted sensor, or smart board)
NOTE: Only heater terminals (H) can be checked with
ohmmeter (30 Ohms).
CAUTION- DO NOT ATTEMPT TO CHECK
SENSOR TERMINALS (CAN DAMAGE SEN-
SOR).
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