Panasonic NN-L530BF, NN-S560BF Troubleshooting of Inverter Circuit U and Magnetron NEW H.V

Troubleshooting of Inverter Circuit (U) and Magnetron NEW H.V.

This oven is programmed with a self diagnostics failure code system which will help for troubleshooting. H97, H98, and H99 are the provided failure

codes to indicate magnetron and inverter circuit problem areas. This section explains failure codes of H97, H98, and H99. First, you must program

the DPC by pressing Clock , Time , Start , Power Level . Program unit for operation. H97, H98, H99 appears in display window a short time after start

key is pressed and there is no microwave oscillation.

H97, H98, or H99 appears in display window

Check magnetron filament continuity		Open	Magnetron*
OK	refer to componenet test
	procedures
Check Inverter input AC voltages at		OV	DPC board
CN702			Loose relay wiring
AC 120V	unplug CN702 and measure
	at lead wire harness side
		OV
Check inverter control signal at			DPC board
CN701, pin 1 and 2
AC3V	unplug CN701 and measure at
	lead wire harness side
			H.V. Inverter (U)
			(SEE NOTE)
NOTE: After check, unplug unit to reset to normal operation mode.

NOTE: DO NOT try to repair this Inverter Power Supply (U) and also DO NOT RE-ADJUST PRESET VOLUME on the board. It is very dangerous to repair or adjust without sufficient test equipment because this circuit han- dles very high voltage and very large current. Off alignment of inverter board operation is dangerous. Operating a misaligned Inverter cir- cuit is dangerous due to the very high voltage and current that is produced by this board. Defective boards must be replaced with a new one.

*Check magnetron filament for open or short to casing before proceeding to determine a good magnetron.

Alternate way to troubleshoot oven with AC Ampere meter used

H97, H98, H99 appears in display window a short time after start key is pressed and no microwave oscillation with AC Ampere

meter used for troubleshooting

H97, H98, or H99 appears in display window

Check oven input AC amperes			0.4-0.8A
measure at oven plug
		more than 1A
			Open
Check	magnetron filament
continuity
OK		refer to component test
		procedures

DPC board

Loose wiring

Magnetron*

NOTE: If filament is opened, AC input Amperes 1 to 1.7A will flow

STOP!

If all the above are OK up to this point, there may be a H.

V. Inverter problem (SEE NOTE)

NOTE: DO NOT try to repair this Inverter Power Supply (U) and also DO NOT

RE-ADJUST PRESET VOLUME on the board. It is very dangerous to repair or adjust without sufficient test equipment because this circuit han- dles very high voltage and very large current. Off alignment of inverter board operation is dangerous. Operating a misaligned Inverter cir- cuit is dangerous due to the very high voltage and current that is produced by this board. Defective boards must be replaced with a new one.

*Check magnetron filament for open or short to casing before proceeding to determine a good magnetron.

NOTE: After check, unplug unit to reset to normal operation mode.

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