10/24/2016
XML Service Manual
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7.5 Simple way of H.V. Inverter/magnetron
troubleshooting
Purpose:
Simple way (3/23 seconds rule) of identifying whether it’s Magnetron, Inverter or others.
Setup:
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:
Ammeter
reading is:
To do:
Remedy:
Power will:
Ammeter
reading is:
To do:
Remedy:
Shut
off
in
23
seconds after “Start”.
1. Between 0.5A
and 1.0A.
Check and repair open magnetron circuit
Open magnetron wiring between Inverter and
magnetron terminal.
2. Between 1.0A
and 2.0A.
Check continuity of D702 in Inverter PCB.
1. D702 shorted
Replace H.V.Inverter
(F606YM300GP)
2. D702 is OK
Replace magnetron
Shut off in 3 seconds
after “Start”
1. Less than
0.5A
Check open circuit: Latch Switch, DPC,
Power Relay and CN701
Replace defective component(s), or correct
switch, cables and connectors.
7.6 How to check the semiconductors using an OHM
meter
