Troubleshooting Guide
MD24 and MD30
5-7
#824820 - Revision A - December, 2013
PSU-DRAWER BOARD FUSE IS OPEN - Continued:
2. Follow troubleshooting guide given below, if indicator does not light up after
above check and repairs are finished.
• Disconnect power supply cord.
• Remove outer case cabinet.
• Open drawer and block it open.
• Discharge high voltage capacitor.
• Disconnect leads to primary of the MD Transformer.
• Ensure that these leads remain isolated from other components and oven
chassis by using insulation tape.
• After procedure, re-connect power supply cord.
• Follow troubleshooting guide given below for repair.
COMPONENT TESTPROCEDURE LETTER
E - continued
STEPS OCCURRENCE CAUSE OR CORRECTION
1
Check for 120 VAC between Pin 5
and 7 of the 4-pin connector CNA.
Check supply voltage and oven
power cord.
2
Check for 24 VDC present between
Pin 1 and 5 on CNC.
If there is 24 VDC then it is likely
PSU-Drawer board at fault. If no
voltage check harness and SW-
PSU-Drawer board.
• Reconnect all leads removed from components during testing.
• Re-install outer case.
• Discharge high voltage capacitor.
• Reconnect the power supply cord after outer case is installed.
• Run oven and check all functions.
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