Troubleshooting Guide - Panasonic NN-GD693S Service Manual

8 TROUBLESHOOTING GUIDE

1. DO NOT RE-ADJUST PRESET CONTROL on the H.V.Inverter (U). It is very dangerous to repair or adjust without proper test equipment
because this circuit generates very large current and high voltage. Operating a misaligned inverter circuit is dangerous.
2. Ensure proper grounding before troubleshooting.
3. Be careful of the high voltage circuitry, taking necessary precautions when troubleshooting.
4. Discharge high voltage remaining in the H.V.Inverter (U).
5. When checking the continuity of the switches or the H.V.Inverter, disconnect one lead wire from these parts and then check continuity with the
AC plug removed. Doing 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 damaged or the
connector cannot be removed.
6. Do not touch any parts of the circuitry on the digital programmer circuit, since static electric discharge may damage this control panel. Always
touch ground while working on this panel to discharge any static charge in your body.
7. 120V AC is present on the digital programmer circuit (Terminals of power relay's and primary circuit of Digital Programmer Circuit). When
troubleshooting, be cautious of possible electrical shock hazard.
Before troubleshooting, operate the microwave oven following the correct operating procedures in the instruction manual in order
to find the exact cause of any trouble, since operator error may be mistaken for the oven's malfunction.
H97 & H98 error code display
If 3 times H97 or 2 times H98 exist, microwave oven can not be used any more, even if the defective parts already be replaced &
un-plug and plug-in again.
How to reset for the service:
Please take the following steps
1. Plug-in oven.
2. Press Stop/Reset button once.
3. Open the door.
4. Keep pressing Start button for more than 2 seconds until buzzer beeps.
5. Press Stop/Reset button three times, oven will show the total usage time of magnetron.
6. Press Power Level button once, oven will show the total number of occurrence of H97 & H98.
7. Keep pressing Start button for more than 2 seconds (until buzzer beeps) to reset.
8. While finish resetting, one beeps, and show "end".
9. Press Stop/Reset to return to initial stage.
Magnetron usage time display
Oven has magnetron usage time display function but it will not be activated in normal operation mode.
To show magnetron usage time result, please take the following steps:
1. Plug-in oven.
2. Press Stop/Reset button once.
3. Open the door.
4. Keep pressing Start button for more than 2 seconds until buzzer beeps.
5. Press Stop/Reset button three times, oven will show the total usage time of magnetron.
(note1:the magnetron usage time is kept in L.S.I. memory.)
(note2:Magnetron usage time display is in hours.)
NOTE:
To delete the recorder of L.S.I. memory.
a. Press Start button for more than 2 seconds until buzzer beeps.
b. While finish deleting, one beeps and show "end".
c. Press Stop/Reset to return to initial stage.
DANGER: HIGH VOLTAGES
21
NN-GD693S