Panasonic NN-J993 Service Manual page 21

NN-J993
9.4. Inverter Power supply (U) (NEW H.V.)
DO NOT try to REPAIR this H.V. Inverter power supply (U).
9.5. Inverter Power Supply (U)
(NEW H.V.)
DANGER HIGH VOLTAGE
Test 1
1. Place 1 liter of water load into oven cavity.
2. Unplug 2 pin H.V. lead wire connector CN703 from
magnetron tube.
3. Program oven at High power for 1 minute and press start.
a. After approx. 23 seconds, oven stops.
b. During oven operation, input current is approx. at 0.5 to 1.0A.
For 110v model and 0.2 to 0.5A for 220/240V models. If input
current is OK, please proceed to test 2.
Test 2
If both 1 and 2 are OK, the Inverter Power Supply (U) can be
determined OK.
Replace as whole H.V. Inverter (U) Unit.
Refer to warning on page 2.
9.6. Temperature thermistor
Those sensor monitors the heat produced by the heater circuit
and maintains the oven temperature uhich user had selected.
Normal room temperature of 10℃ to 30℃, the reading across
the thermistor should be as follows.
If the resistance reading is out of the range stated here, the
sensor is detective and must be replaced.
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