Panasonic NN-K593MF Service Manual page 16

NN-S453WF
6.5. Inverter power supply (U)
DO NOT try to repair H.V. Inverter Power Supply (U)
Replace complete H.V. Inverter(U) Unit.
DANGER HIGH VOLTAGE
Test if failure codes of H97 or H98 appear by doing the
following procedure. It is recommended to use an AC line input
current Ampere meter for testing.
Test1
1. Program DPC.
a. Tap Clock keypad
b. Tap Timer keypad
c. Tap Start keypad
d. Tap Micro Power keypad
2. Place 1 liter of water load into oven cavity.
3. Unplug 2 pin H.V. lead wire connector CN703 from
magnetron tube.
4. Program oven at High power for 1 minute and press start.
a. After approximately 23 seconds, oven stops.
b. During oven operation, input current is approximately
0.5 to 1A.
Unplug CN703
If both a and b are OK, proceed to test 2.
Test2
Continued from Test 1
1. Unplug 3 pin connector CN701. CN703 remains unplugged.
2. Program oven at High power for 1 minute and press start.
a. After approximately 3 seconds, oven stops.
b. During oven operation, input current is approximately
0.4A.
Unplug CN701
If both a and b check OK, the Inverter Power Supply (U) can
be determined to be OK.
INPUT AMPERE FAILURE CODE
0.5 to 1A Oven stops in 23
seconds after started.
INPUT AMPERE FAILURE CODE
<0.4A Oven stops in 3
seconds after started.
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