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:
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
(F606YBA00GP)
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.
9.5. How to check the semiconductors using an OHM meter
24
NN-GD391S / NN-GD371M
Summary of Contents for NN-GD371M
Page 2: ...2 NN GD391S NN GD371M ...
Page 3: ...3 NN GD391S NN GD371M ...
Page 5: ...1 FEATURE CHART 2 CONTROL PANEL 5 NN GD391S NN GD371M ...
Page 6: ...3 SCHEMATIC DIAGRAM 3 1 NN GD371M KTE PTE 6 NN GD391S NN GD371M ...
Page 7: ...3 2 NN GD391S ZPE GD371M ZPE 7 NN GD391S NN GD371M ...
Page 16: ...6 Remove 2 screws holding H V inverter on the inverter bracket 16 NN GD391S NN GD371M ...
Page 26: ...10 EXPLODED VIEW AND PARTS LIST 10 1 EXPLODED VIEW 26 NN GD391S NN GD371M ...
Page 34: ...11 DIGITAL PROGRAMMER CIRCUIT 11 1 SCHEMATIC DIAGRAM 34 NN GD391S NN GD371M ...
Page 35: ...35 NN GD391S NN GD371M ...
