Troubleshooting Of Inverter Circuit (U) And Magnetron [New H.v.] - Panasonic NN-P295 Service Manual

SYMPTOM
H97/H98 appears in window
and ovenstops operation.
Program High powerfor 1
minute and conduct
following testquickly, unless
H97/H98 appears andoven
stops. [NEW H.V.]

13.2. 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] , [Timer] , [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.
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
STEP CHECK
1 Unplug CN702(2 pin)
connector and
measure voltage
between terminals
2 Unplug CN701(3 pin)
connector and
measure pin 1 voltage
38
RESULT CAUSE/CORRECTIO
0V
1. Latch Switch
2. DPC/Power Relay
AC line voltage
of 120V
0V DPC
Approx. AC 3V Magnetron
Step 2