Panasonic NN-ST651B - Special Cooking Features; Popcorn Cooking Feature; Adjusting Cook Time (More;Less)

5.5. Inverter power supply (U)
DO NOT try to REPAIR H.V. Inverter power supply (U).
Replace complete H.V. Inverter(U) Unit.
WARNING: HIGH VOLTAGE
Test if failure codes H95, H97 or H98 appear when performing
the following procedure. It is recommended to use an AC line
input current ammeter for testing.
Test 1
1. With the oven unit’s AC power supply cord is unplugged
from the wall outlet, unplug the 2 pin H.V. connector CN703
from the magnetron tube.
2. Place 1 liter of water load into oven cavity.
3. Plug in the oven’s AC power supply cord into outlet.
4. Program DPC.
For SD691S & SD671S models
a. Press Clock
button once.
b. Press Timer
button once.
c. Press Start
button once.
d. Press Power Level
button once.
For except SD691S & SD671S models
a. Press Timer/Clock
pad twice.
b. Press Start
pad once.
c. Press Power Level
pad once.
5. Program oven at High power for 1 minute and press [Start]
pad.
a. After approximately 23 seconds, oven stops operating.
b. During oven operation, the input current is
approximately 0.5 to 1A. If both a and b are OK,
proceed to test 2.
INPUT CURRENT FAILURE CODE
Unplug CN703 0.5 to 1A Oven stops in 23
seconds after started.
Test 2
Continued from Test 1
1. Unplug the oven’s AC power supply cord from outlet.
2. Unplug 3 pin connector CN701. CN703 remains unplugged.
3. Plug in the oven’s AC power supply cord into outlet.
4. Program DPC.
For SD691S & SD671S models
a. Press Clock
button once.
b. Press Timer
button once.
c. Press Start
button once.
d. Press Power Level
button once.
For except SD691S & SD671S models
a. Press Timer/Clock
pad twice.
b. Press Start
pad once.
c. Press Power Level
pad once.
5. Program oven at High power for 1 minute and press [Start]
pad.
a. After approximately 3 seconds, oven stops operating.
b. During oven operation, the input current is
approximately 0.4A.
INPUT CURRENT FAILURE CODE
Unplug CN701 0.4A Oven stops in 3
seconds after started.
If both a and b check OK, the Inverter Power Supply (U) can be
determined to be OK.
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NN-SD691S / NN-ST681S / NN-SD671S / NN-ST671S / NN-ST661S / NN-ST661B / NN-ST661W / NN-ST651B / NN-ST651W