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15
Cooking Updates
Ø If 120 volts is present and the MW relay 4903 does not close (send the 120
volts to the inverter boards), unplug microwave oven or disconnect power.
Replace PCBA, and go to Step 14.
8. If 120 volts are supplied through the relay to the inverter:
Ø Check for 5 VDC (microwave oven o) and 2.4 VDC (microwave oven
running) at connector P23-3 to P23-2 of the PCBA.
Ø If a reading of 0.15 VDC is measured, the source of the problem is either the
magnetron or the inverter board.
9. Unplug microwave oven or disconnect power.
10. Test the magnetron for a short or open per the instrucons in the “Component Tests”
secon of tech sheet. If magnetron tests fail, replace the magnetron. Go to Step 14.
11. Check for 1.3-3.5 VDC at the Printed Circuit Board Assembly (PCBA) connector P23-1 to
P23-2 by compleng the following steps:
12. Unplug microwave oven or disconnect power.
13. Plug in microwave oven or reconnect power.
Ø If voltage reading is incorrect, unplug microwave oven or disconnect power,
and replace the PCBA. Go to Step 14.
Ø If 1.3-3.5 VDC is measured, unplug microwave oven or disconnect power,
and replace the inverter. Go to Step 14.
14. Replace all parts and panels before operang.
15. Plug in microwave oven or reconnect power.