Originally Posted by twincam
After a power failure, the colon “:” will be flashing. Press any key to end this indication. The colon will then be steady when in standby.
Keyboard Failure Replace membrane switch. If problem persists, replace control system assembly.
Connect a new sensor to the board (at P5). If no failure code appears when starting sensor function, replace old sensor. Otherwise, replace control system assembly.
1. Check that the oven temperature is not below 5°C (41°F) or above 60°C (140°F).
2. If problem persists, replace the control system assembly.
1. Unplug the oven for at least 40 seconds. Check to see if this solves the problem. (Possible reason: Over temperature protection for the magnetron operated earlier.)
2. Check the resistance of the magnetron thermostat. It should be close to 0 ohms.
3. Check wiring to the 1100W inverter and control system.
4. Replace 1100W inverter.
5. If problem persists, replace control system assembly.
Measure Oven Input Current
Connect an ammeter to measure the input
current of microwave oven when the power
level is set to Level 10 at the touch panel:
■ If more than 0.5A, the 1100W inverter
is probably OK. Check the magnetron
using test on page 9, and wiring.
■ If less than 0.5A, there is no input to the 1100W inverter.
Check for the following:
No AC voltage supply. Check Control System Assembly PCB and wiring.
No control signal. Check Control System Assembly PCB and wiring.
Checking the 1100W Inverter
NOTE: Do not try to repair the
inverter board, nor try to make
any adjustments to the board.
Check wiring to 1100W
1. Unplug the oven’s main
2. Visually inspect 4 connectors
on the 1100W inverter board:
CN701, CN702, CN703, E701
to see whether there are any
signs of failure due to loose
wires, bad crimping, signs of
Hope it helps