Panasonic NN-8508 - Page 29

NN-8508, NN-8558
NN-8808, NN-8858
NN-8808P Se
CHECK CAUSE
Voltage of iC1, Pin No.
19 (at operation)
SYMPTOM
Heater does not turn on.
Abnormal!
Normal {| DC 5V
Voltage of IC3, Pin No.
12 (at operation)
Normal | OV
Check Q5 (NOTE 1)
Normal
Abnormal
Abnormal
IC2, RYD (4)
Voltage of IC1, Pin No.
20, 21 (at High power
operation)
Normal }| SV
Check Q6 (NOTE 1)
Normal
Abnormal
No microwave oscillation
at any power setting
Abnormal
IC2, RYB (2)
NOTE 1: Refer to page 30.
Short circuit across the
sensor terminals and
check the operation
Oven stops it's operation
30 seconds after the start
pad is tapped.
Humidity sensor heater
stays on (Red Glows)
for 30 seconds.
Oven operates
TO
BE
CONTINUED
FOR
HUMIDITY
SENSOR
MODELS
(Refer
to
schematic
diagram
on
page
39.)
continuously
until
cancel pad is tapped.
Heater shut off by itself.
C6, Q3, IC1
Normal Open heater of humidity
AC 52 10V sensor.
No voitage
Still oven stops operation
at 30 seconds
Voltage across the
Humidity sensor heater
heater terminals (NOTE)
does not heat up at all.
No voltage
Voitage of L.V.T.,
between S1 and S2
NOTE: This voltage appeares
while refreshing time ool.
Refer Fig. 14A on page 14
AC 10~20V
D20 (Triac), IC1,Q2