Trouble) Oven Stops Operation During Cooking - Panasonic NN-V653WF Service Manual

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 these
parts and then check continuity with the AC plug removed. To do otherwise may result in a false
damage to your meter. When disconnecting a plastic connector from a terminal, you must hold the
connector instead of the lead wire and then disconnect it, otherwise lead wire may be open or the
connector cannot be removed.
6. Do not touch any parts of the circuitry on the digital programmer circuit, since static electric discharge
damage this control panel. Always touch yourself to ground while working on this panel to discharge
static charge in your body.
7. 230-240V AC is present on the digital programmer circuit (Terminals of power relay's and primary
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
1. Oven stops in 3 seconds after
pressing start pad
Oven stops in 23 seconds
after pressing start pad
Oven stops in 10 seconds
after pressing start pad
(Auto sensor cooking)
2. No display and no operation
at all.
Fuse is blown.
DANGER HIGH VOLTAGES
CAUSE
No 230-240V AC is supplied to
H.V.Inverter (U) CN702 terminals
H.V.Inverter (U) operates by the
control signals from DPC but
magnetron is not oscillating
Steam sensor circuit does not
function
Most probably loose connection of
connectors or door latch mechanism
is not adjusted properly
28
CORRECTIONS
1. Latch Switch
2. Power relay RY-1
3. Loose lead wire connector
CN701, CN702
1. Magnetron
2. Loose lead wire connector
CN703
1. Steam sensor
2. DPC
3. Loose wiring connector
1. Allign door, Door Latch
2. Loose wiring connectors