Simple Way Of H.v. Inverter/Magnetron Troubleshooting; How To Check The Semiconductors Using An Ohm Meter - Panasonic NN-GD391S Service Manual

NN-GD391S / NN-GD371M
9.4.

Simple way of H.V. Inverter/magnetron troubleshooting

Purpose:
Simple way (3/23 seconds rule) of identifying whether it's Magnetron, Inverter, or others.
Set-up:
The unit under question is connected through the Ammeter as shown below.
Procedure:
Follow the matrix table below to identify the problem source.
Note:
Do not replace both Inverter board and Magnetron simultaneously and automatically without going through this
procedure.
Power will:
Shut off in 23 seconds 1. Between 0.5A and 1.0A.
after "Start".
2. Between 1.0A and 2.0A.
Shut off in 3 seconds 1. Less than 0.5A
after "Start"
9.5.

How to check the semiconductors using an OHM meter

Ammeter reading is:
Check and repair open magnetron circuit Open magnetron wiring between Inverter
Check continuity of D702 in Inverter PCB.
1. D702 shorted
2. D702 is OK
Check open circuit: Latch Switch, DPC,
Power Relay and CN701
To do:
24
Remedy:
and magnetron terminal.
Replace H.V.Inverter
(F606YBA00GP)
Replace magnetron
Replace defective component(s),
correct switch, cables and connectors.
or