Simple Way Of H.v. Inverter/Magnetron Troubleshooting; How To Check The Semiconductors Using An Ohm Meter - Panasonic NN-SF564W Service Manual

NN-SF564W
9.5.

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".
9.6.

How to check the semiconductors using an OHM meter

Ammeter reading is:
Check and repair open magnetron circuit
CN703.
Check continuity of D702 in Inverter PCB.
1. D702 shorted
2. D702 is OK
Check open circuit: Interlock Switch,
DPC, Power Relay, CN701 and CN702.
To do:
22
Remedy:
Open magnetron wiring between Inverter
and magnetron terminal.
Replace H.V.Inverter(F606YBH20GP)
Replace magnetron
Replace defective component(s),
correct switch, cables and connectors.
or