Troubleshooting Guide - Panasonic NN­GS595A Service Manual

10/24/2016
7 TROUBLESHOOTING GUIDE
DANGER HIGH VOLTAGES
DO NOT RE­ADJUST PRESET CONTROL on the H.V.Inverter (U). It is very dangerous to repair or adjust without proper test
1. equipment because this circuit handles very large current and high voltage. Operating a misaligned inverter circuit is
dangerous.
2. Ensure proper grounding before checking for trouble.
3. Be careful of the high voltage circuitry, taking necessary precautions when troubleshooting.
4. Discharge high voltage remaining in the H.V.Inverter (U).
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. To do otherwise may result in a false reading or damage to your meter. When
5.
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.
Do not touch any parts of the circuitry on the digital programmer circuit, since static electric discharge may damage this control
6.
panel. Always touch yourself to ground while working on this panel to discharge any static charge in your body.
220/240V AC is present on the digital programmer circuit (Terminals of power relay's and primary circuit of Digital Programmer
7.
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.
Self diagnostic display
Oven has self diagnostic function but it will not be activated in normal operation mode.
To show self diagnostic result, please take the following steps.
1. Firstly, you must program the DPC into TEST MODE (Plug­in oven → press Timer/Clock pad twice → press Start pad
once → press Micro Power pad once.)
2. Keep pressing Steam Shot pad for more than 2 seconds until buzzer beeps.
3. Press Start pad twice, oven will show error code.
NOTE:
1. If any error was observed, it will be kept in memory up to 3 errors in the past. If there are more than 4 cases,
the memory will renew the lastest 3 errors codes.
2. Press Start pad again, one more older error code will be displayed.
3. If the oven is ok, it will show "000" and blinking.
4. Error cod list
H** Hardware problem, oven itself has problem.
U** Usage problem such as run out of water and oven itself works well.
Error code
H99 Inverter on/off control error
H98 Magnetron no oscillation error
H97 Inverter input error
H96 Inverter custom IC error
H95 Inverter input failure
H90 Power down controlled by Inverter thermistor
H68 IR sensor failure
H61 IR thermistor open/short
H60 IR sensor error
H44 Key board switch failure
H39 Steam heater thermistor failure
H32 Magnetron thermistor failure
H30 Oven thermistor failure
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Cause for error
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