MD24 and MD30
Troubleshooting Guide
5-14
#824820 - Revision A - December, 2013
COMPONENT TEST
PROCEDURE LETTER
N - continued
NOISE FILTER CONTINUED:
If fuse is open, replace fuse.
If incorrect readings are obtained, replace noise filter board.
6. Reconnect all leads removed from components during testing.
7. Re-install outer case.
8. Reconnect power supply cord after outer case is installed.
9. Run oven and check all functions.
O
HIGH VOLTAGE RECTIFIER TEST:
1. Disconnect power supply cord, and then remove outer case.
2. Open drawer and block it open.
3. Discharge high voltage capacitor.
4. Isolate rectifier from circuit. Using highest ohm scale of meter, read resistance
across terminals and observe, reverse leads to rectifier terminals and observe
meter reading. If a short is indicated in both directions, or if an infinite resistance
is read in both directions, rectifier is probably defective and should be replaced.
5. Reconnect all leads removed from components during testing.
6. Reinstall outer case.
7. Reconnect power supply cord after outer case is installed.
8. Run oven and check all functions.
NOTE: Be sure to use an ohmmeter that will supply a forward bias voltage of
more than 6.3 volts.
P
DIODE TEST (for RY1, RY2, RY3, and RY4):
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 primary of the MD transformer.
5. Ensure that these leads remain isolated from other components and oven
chassis by using insulation tape.
6. After insolating primary wires, re-connect the power supply cord.
7. Set your multimeter to mid-range ohm.
8. Place your leads on each end of diode.
The reading will be High Resistance or Low Resistance.
9. Reverse meter leads. You should read opposite of first reading.
10. If reading is same for both lead positions, diode is bad - replace PSU-Drawer
board.
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