7 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 adjust without proper 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 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. 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 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 yourself to ground while working on this panel to discharge any static charge in your body.
7. 230-240V 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.
7.1. (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
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. Align door, Door Latch Switches
2. Loose wiring connectors
16
NN-GD376S / NN-GD366M / NN-GD356W
Summary of Contents for NN-GD376S
Page 2: ...2 NN GD376S NN GD366M NN GD356W ...
Page 3: ...3 NN GD376S NN GD366M NN GD356W ...
Page 5: ...1 SCHEMATIC DIAGRAM 5 NN GD376S NN GD366M NN GD356W ...
Page 18: ...7 2 Trouble related to Digital Programmer Circuit 18 NN GD376S NN GD366M NN GD356W ...
Page 21: ...8 EXPLODED VIEW AND PARTS LIST 8 1 EXPLODED VIEW 21 NN GD376S NN GD366M NN GD356W ...
Page 27: ...9 DIGITAL PROGRAMMER CIRCUIT 9 1 SCHEMATIC DIAGRAM NN GD376S 27 NN GD376S NN GD366M NN GD356W ...
Page 28: ...28 NN GD376S NN GD366M NN GD356W ...
Page 29: ...9 2 SCHEMATIC DIAGRAM NN GD366M GD356W 29 NN GD376S NN GD366M NN GD356W ...
