Panasonic NE-1856 Service Manual

TROUBLESHOOTING GUIDE
CAUTION
1. Check grounding before checking for trouble.
2. Be cafeful of the high voltage ci
rcuito
3. Discharge high voltage capacitor.
4. When checking the continuity of the switches or the high voltage transformer, disconnect one lead wlre from
.
these pa rt~ and then check continuity with the AC plug removed. To do otherwise rnay result in a: false reading
or damage to your meter.
When disconnecting a plastic connector from a terminal, you must hold the plastic connector instead of the
lead wire and then disconnect it, otherwise lead wire may be open or the connector cannot be removed.
5. Be sure to ground any static electric charge built up in your body, before handling the D.P.C.
6. A 230-240V AC is present at the shaded area
~:::: :: :::~ of the power supply circu lt board (Terminals of power
relays and primary circuit of low voltage transformer). When troubleshootínqbs cautious of possible electrical
shock hazard.
•·.. ~ ..- , ••,'I;
First of all operate the microwave oven following the correct operating procedures described on pages 3 of this service manual in order to find the
exact cause of any trouble.
NOTE: If the unit shows faulty symptom as shown be low , check the parts listed in pos sible cause column depending on
failure indication e.g. F81 , F82 in the display.
[TROUBLE 1] Oven does not operate at all or oven does not start cooking.
DISPLAY
CONDITIONS
POSSIBLE CAUSE
TIMING OF FAILURE INDICATION
F33
Open temperature 1.Temperature sensor failure
lt is appeared when failure occured.
sensor (exhaust) 2.Digital programmer circuit failure
3.Loose connector CN4
F34 Short temperature 1.Temperature sensor failure
It is appeared when failure occured.
sensor (exhaust) 2.Digital programmer circuit failure
F44
1.Shorted power select switch
It is appeared 2 minuted after failure occured.
2.Shorted membrane switch
FD1
Exhaust temperature 1.Burning food in the 0v.endue to over cook
It is appeared when exhaust temperature exceeds
(With
continuOUS)
exceeds 120'C aboye 120'C
beepsounds
F05
Memory failure 1.Digital programmer circuit failure
No display
1.25A fuse blown 1.Switch failure SW4, SW5, SW6, SW7
2.Low-Voltage transformer failure
No display
1.25A fuse is OK
1.Switch failure SW1, SW2, SW3
2.Low voltage transformer failure
3.Digital programmer circuit failure
F81
No voltage supply
1.Relay failure RY
~ 3
It is appeared when cooking is completed.
to high voltage
2.1DAfuse open
transformer (uppsr)
3.Digltal programmer circuit failure
F82
No voltage supply
1.Relay failure RY-4
It is appeared when cooking is completed.
to high voltage
2.10A fuse open .
transformer (Iower)
3.Digital proqrarnrner circuit failure
F86
Shorted contacts of
1.Relay failure RY-3
It is appeared when failure occured.
RY-3
2.Digital programmer circuit failure
F87
Shorted contacts of
1.Relay failure RY-4 lt is appeared when failure occured .
RY-4
2.Digital programmer circuit failure
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1).:
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Panasonic NE-1856 Specifications

General

Brand	Panasonic
Model	NE-1856
Category	Microwave Oven
Language	English