Panasonic NN-GS595A, Руководство по обслуживанию

Страница: 28 / 47

10/24/2016 XML Service Manual
file:///C:/Users/sh.dehghani/Desktop/NN­GS595AOTSVC_PHAMOS0511035C3/viewing/SGML_VIEW_DATA/OT/NN­GS595A/SVC/PHAMOS0511035C3/inde… 3/6
SYMPTOM CAUSE CORRECTIONS
2. No display and no operation at
all.
Fuse is blown.
Check adjustment of primary,
secondary latch switch and short
switch including door.
2. Defective primary latch switch (NOTE 1)
3. Defective short switch (NOTE 1)
4. Defective Inverter Power Supply (U)
NOTE 1:
All of these switches must be replaced at the same time.
Check continuity of power relay B (RY­1)ʼs contacts (between 1 and 2) and if it has
continuity, replace power relay B (RY­1) also.
3.
Oven does not accept key input
(Program)
1. Key input is not in proper sequence Refer to operation procedure.
2.
Open or loose connection of membrane key pad to
DPC (Flat cable)
3. Shorted or open membrane key board
4. Defective DPC
Refer to DPC troubleshooting.
4.
Fan motor turns on when oven is
plugged in with door closed.
1.
Misadjustment or loose wiring of secondary latch
switch
Adjust door and latch switches.
2. Defective secondary latch switch
5.
Timer starts count down but no
microwave oscillation.
(No heat while oven lamp and
fan motor turn on)
1. Off­alignment of latch switches Adjust door and latch switches.
2.
Open or loose connection of high voltage circuit
especially magnetron filament circuit
NOTE:
Large contact resistance will cause lower
magnetron filament voltage and cause magnetron
to have lower output and/or be intermittent.
Check high voltage component
according to component test
procedure and replace if it is
defective.
3.
Defective high voltage component H.V. Inverter
Power Supply (u) Magnetron
Check high voltage component
according to component test
procedure and replace if it is
defective.
4. Open or loose wiring of power relay B (RY­1)
5. Defective primary latch switch
6. Defective DPC or power relay B (RY­1)
Refer to DPC troubleshooting
6.
Oven can program but timer
does not start countdown.
1. Open or loose wiring of secondary latch switch
2. Off­alignment of secondary latch switch
3. Defective secondary latch switch
7.
Microwave output is low. Oven
takes longer time to cook food.
1. Decrease in power source voltage Consult electrician
2.
Open or loose wiring of magnetron filament circuit.
(Intermittent oscillation)
3. Aging change of magnetron
8.
Fan motor turns on and turntable
rotates when door is opened.
1. Shorted primary latch switch
9.
Oven does not operate and
return to plugged in mode as
soon as start pad is pressed.
1. Defective DPC
Check grounding connector on
escutcheon base.
10.
Loud buzzing noise can be
heard.
1. Loose fan and fan motor
11. Heater does not turn on.
1. Open or loose wiring of heater
2. Defective heater
3. Defective power relay
4. Defective DPC
12.
Oven stops operation during
cooking.
1.
Open or loose wiring of primary and secondary
latch switch
Adjust door and latch switches.
2. Operation of thermal cutout
7.3 Troubleshooting of inverter circuit (U) and
magnetron NEW H.V.