Troubleshooting Guide - Panasonic NN-K153WF Service Manual

the magnetron using the simple method outlined below.
Necessary Equipment:
- 1 liter beaker
- Glass thermometer
- Wrist watch or stopwatch
NOTE:
Check the line voltage under load.Low voltage will lower the
magnetron output. Take the temperature readings and heating time
as accurately as possible.
1. Fill the beaker with exactly one liter of tap water. Stir the water
using the thermometer and record the beaker's temperature.
(recorded as T1).
2. Place the beaker on the center of glass cook plate. / Set the oven
for High power and heat it for exactly one minute.
3. Stir the water again and read the temperature of the beaker.
(recorded as T2).
4. The normal temperature rise at High power position for each
model is as shown in table.
TABLE (1L-1min.test)
RATED OUTPUT
800W(IEC705-88)

11. 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
from these parts and then check continuity with the AC plug removed. To do otherwise may result
reading or damage to your meter. / When disconnecting a plastic connector from a terminal, you must
the plastic connector instead of the lead wire and then disconnect it, otherwise lead wire may be damaged
or the connector cannot be removed.
5. Do not touch any parts of the circuitry on the digital programmer circuit, since static electric discharge
may damage this control panel. / Always touch yourself to ground while working on this panel to discharge
any static charge in your body.
6. 230V-240V AC is present on the digital programmer circuit (Terminals of power relay's and primary
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 in order to
TEMPERATURE RISE
Min. 8°C
25
CAUTION