Panasonic NN-GD566M - Troubleshooting Guide

9. TROUBLESHOOTING GUIDE
DANGER HIGH VOLTAGES
1.
DO NOT RE-ADJUST PRESET CONTROL on the H.V.Inverter (U). It is very dangerous to repair
or
without sufficient test 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 remains in the H.V.Inverter (U).
5.
When checking the continuity of the switches or the H.V.Inverter, disconnect one lead wire
from
parts and then check continuity with the AC plug removed. To do otherwise may result in a
false
or damage to your meter. When disconnecting a plastic connector from a terminal, you must
hold
plastic connector instead of the lead wire and then disconnect it, otherwise lead wire may be
open
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 yourself to ground while working on this panel
to
any static charge in your body.
7.
230-240V AC is present on the digital programmer circuit (Terminals of power relay’s and
primary
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.
9.1. (Trouble) Oven stops operation during cooking
SYMPTOM CAUSE
CORRECTIONS
1. Oven stops in 3 seconds
after pressing start pad
No 230-240V AC is supplied to
H.V.Inverter (U) CN702 terminals
1. Latch Switch
2. Power relay RY-1
3. Loose lead wire
connector
CN701, CN702
Oven stops in 23 seconds
after pressing start pad
H.V.Inverter (U) operates by the
control signals from DPC but
magnetron is not oscillating
1. Magnetron
2. Loose lead wire
connector
CN703
Oven stops in 10 seconds
after pressing start pad
(Auto sensor cooking)
Steam sensor circuit does not
function
1. Steam sensor
2. DPC
3. Loose wiring
connector
2. No display and no operation
at all.
Fuse is blown.
Most probably loose connection of
connectors or door latch mechanism
is not adjusted properly
1. Allign door, Door
Latch
2. Loose wiring
connectors
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