Troubleshooting Guide
MD24 and MD30
5-13
#824820 - Revision A - December, 2013
HIGH VOLTAGES ARE PRESENT AT HIGH VOLTAGE TERMINAL, SO DO NOT
ATTEMPT TO MEASURE FILAMENT AND HIGH VOLTAGE WHILE ENERGIZED.
M
MD TRANSFORMER TEST:
1. Disconnect power supply cord.
2. Open drawer and block it open.
3. Discharge high voltage capacitor.
4. Disconnect primary input terminals and measure resistance of the MD trans-
former with an ohmmeter. Check for continuity of coils with an ohmmeter. On
the R x 1 scale, resistance of primary coil should be less than 1 ohm and
resistance of high voltage coil should be approximately 90 ohms; resistance
of filament coil should be less than 1 ohm.
5. Reconnect all leads removed from components during testing.
6. Reassemble unit.
7. Reconnect power supply cord.
8. Run oven and check all functions.
COMPONENT TESTPROCEDURE LETTER
N
NOISE FILTER:
1. Disconnect power supply cord, and then remove outer case.
2. Open drawer and block it open.
3. Discharge high voltage capacitor.
4. Disconnect leads to the primary of the MD transformer.
5. Using an ohm-meter, check between terminals as described in following table:
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