7-15
TEST AND CHECKOUT PRECEDURES AND TROUBLESHOOTING
A. TEST PROCEDURES
- CAUTIONS -
- DISCONNECT THE POWER SUPPLY CORD
FROM THE WALL OUTLET WHENEVER
REMOVINGING THE CABINET FROM THE UNIT.
PROCEED WITH THE TESTS ONLY AFTER
DISCHARGING THE HIGH VOLTAGE CAPACITOR
AND REMOVING THE WIRE LEADS FROM THE
PRIMARY WINDING OF THE HIGH VOLTAGE
TRANSFORMER. (SEE FIGURE 24)
- ALL OPERATIONAL CHECKS WITH MICROWAVE
ENERGY MUST BE DONE WITH A LOAD (1 LITER
OF WATER IN CONTAINER) IN THE OVEN.
COMPONENTS TEST PROCEDURES RESULTS
NOTE: A MICROWAVE ENERGY LEAKAGE TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS
SERVICED FOR ANY REASON.
MAGNETRON
(Wire leads are
removed)
HIGH-VOLTAGE
TRANSFORMER
(Wire leads are
removed)
1. Remove wire leads. Install the magnetron
seal in the correct position. Check that the
seal is in good condition.
2. Measure resistance. (ohm meter scale:Rx1)
• Filament terminal
3. Measure resistance. (ohm meter scale:Rx1000)
• Filament to chassis
1. Remove wire leads.
2. Measure resistance. (ohm meter scale: Rx1)
• Primary winding
• Secondary winding
• Filament winding
3. Measure resistance. (ohm meter scale:
Rx1000)
• Primary winding to ground
• Filament winding to ground
Normal reading:
Less than 1 ohm.
Normal reading:
Infinite ohms.
NOTE: Replace the magnetron, if the
magnetron checks and all of the
high voltage component tests are
good, but the unit still does not heat
a load.
Normal readings:
Approx. 0.3 to 0.5 ohm.
Less than 0.1 ohm.
Approx. 65 to 120 ohms.
Normal readings:
Infinite ohms.
Infinite ohms.
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