Panasonic NNSN756B - MICROWAVE OVEN 1.6CUFT, Service Manual

Page: 12 / 29

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: 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
(F606Y6G00CP)
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.
5. H.V.INVERTER BOARD MAIN PARTS LIST
(F606Y6G00CP)
12