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 model
s
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.
17
NN-SD691S / NN-ST681S / NN-SD671S / NN-ST671S / NN-ST661S / NN-ST661B / NN-ST661W / NN-ST651B / NN-ST651W
Summary of Contents for Inverter NN-ST651W
Page 2: ...2 NN SD691S NN ST681S NN SD671S NN ST671S NN ST661S NN ST661B NN ST661W NN ST651B NN ST651W ...
Page 3: ...3 NN SD691S NN ST681S NN SD671S NN ST671S NN ST661S NN ST661B NN ST661W NN ST651B NN ST651W ...
Page 38: ...38 NN SD691S NN ST681S NN SD671S NN ST671S NN ST661S NN ST661B NN ST661W NN ST651B NN ST651W ...
Page 40: ...40 NN SD691S NN ST681S NN SD671S NN ST671S NN ST661S NN ST661B NN ST661W NN ST651B NN ST651W ...
