Microwave Performance Test; Humidity Sensor Test; Microwave Leakage Test - GE SCB2000 Technical Service Manual

Microwave Performance Test

This test will verify that the microwave oven high
voltage and magnetron circuits are operating to
performance specifications.
1. Using only a WB64XO073 beaker, place a
standard test load of 1 liter (1000 ml) of water
in the beaker. Measure and record the water
temperature prior to making the test. The
water temperature should be between 59°F
and 75°F.
2. Place the beaker in the center of the oven on
the white ceramic microwave cooking tray.
3. Close the oven door. At the front control panel,
select "Microwave, Time Cook, 2:03 Minutes,
Power Level 10." Press START to begin
microwave cooking.
Select COOK TIME
2:03 M=10
OVEN LOCKED SELECT
4. At the end of the cooking cycle, remove the
beaker of water, and measure and record the
temperature.
5. The minimum difference between the initial
and ending temperatures should be 32°F at
240 volts.
If the water temperature rose but did not reach the
32°F minimum, suspect a problem with the line
voltage (test under full load) or magnetron tube/
high voltage circuit.
If the water temperature did not rise at all, suspect
a problem in the high voltage circuit.

Humidity Sensor Test

Note: Oven should be plugged in at least 5
minutes before test.
• Room temperature should not exceed 95°F.
• Be sure the exterior of the cooking container
and the interior of the oven are dry.
• No sensor cooking is available during 5 minutes
immediately after speedcook.
The humidity sensor can be tested from the front
control panel area using the following diagnostic
procedure:
1. Disconnect the humidity sensor connector
2. Using an ohmmeter, set the scale to Rx1000,
MUTE TIMER
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Microwave Leakage Test

Caution: This test should not be performed
during a speedcook operation. This test should
only be performed during microwave-only
operation.
To perform a microwave leakage test:
1. Place 275 ml of water in a 600 ml beaker
2. Place the beaker in the center of the white
3. Set the leakage meter to the 2450 MHz scale.
4. Program the microwave for 5 minutes (power
5. Hold the probe perpendicular to the surface
– 44 –
from the smart board (CN4, 3 pin - red
connector plug located at the top of the smart
board).
and confirm the following approximate
resistance readings:
a. BLK - RED = 6.2K ohms
b. RED - WHT = 3.1K ohms
c. BLK - WHT = 3.1K ohms
1
2
3
(WB64X5010).
ceramic tray.
level 10) and press START.
being tested and scan surfaces at a rate of
one inch/sec. Scan the following areas:
• Entire perimeter of door and control panel
• Viewing surface of door window
• Exhaust vents
BLK
RED
WHT
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