Panasonic NN-H264SFR, Service Manual

Page: 13 / 83

4 SIMPLE WAY OF H.V. INVERTER/MAGNETRON
TROUBLESHOUTING
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
(F606Y6G00AP/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
(F606Y6G00AP/F606Y6G00CP)
Ref. No. Part No. Part Name & Description Pcs/Set Remarks
C707 ECWH30822JUA CAPACITOR 1 8200PF,3000VDC
C706 ECWH30562JUA CAPACITOR 1 5600PF,3000VDC
D701,D702 B0FBAZ000001 DIODE SI 2
DB701 B0FBBS000001 BRIDGE DIODE 1 20A,600V
L701 F50206G00AP CHOKE COIL 1
Q701 B1JAGV000008 TRANSISTOR SI 1 900V
T701 A609A6G00AP H.V. TRANSFORMER 1
13
NN-P295 NN-H275 / NN-S255 NN-S245 / NN-H264SFR / NN-H264BFR / NN-H264WFR / NN-S254SFR / NN-S254BFR / NN-S254WFR