Troubleshooting Guide - Panasonic NE-3280 Service Manual

Output power performance test procedure.
1. Fill the beaker with exactly one litre of tap water. Stir the
water using the thermometer and note the temperature.
(Record as T1)
2. Place the beaker in the center of cook plate. Set the oven
for High power and heat for exactly one minute.
3. After completion of the heating cycle, stir the water again
with the thermometer and note the temperature. (Record as
T2)
The normal temperature rise (T2 — T1) at High power position
for each models is as shown in following table.
Model
NE-3280
NE-3240
NE-2180
NE-2140

17 TROUBLESHOOTING GUIDE

1. Check grounding before checking for trouble.
2. Be careful of high voltage circuit.
3. Discharge high voltage capacitor.
4. When checking the continuity of the switches or the high voltage transformer, disconnect one lead wire from these parts and then check
continuity with the AC plug removed. To do otherwise may 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/400V AC is present at the shaded area ( ) of the power supply circuit board (Terminals of power relays and primary circuit of low
voltage transformer). When troubleshooting, be cautious of possible electrical shock hazard.
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 below, check the parts listed in possible cause column depending on
failure indication e.g. F81, F82 in the display.
[TROUBLE] Oven does not operate at all or oven does not start cooking. NE-3280, NE-3240
DISPLAY CONDITIONS
F33 Open temperature
sensor (exhaust)
Temperature Rise
(1 liter — 1 Min.)
Min. 27.4°C
Min. 18°C
POSSIBLE CAUSE
1. Temperature sensor failure
2. Digital programmer circuit failure
3. Loose connector CN5
CAUTION
25
NE-3280 / NE-3240 / NE-2180 / NE-2140
TIMING OF FAILURE INDICATION
It is appeared when failure occurred.