Advertisement
SYMPTOM
Humidity sensor heater stay red
glows for 30 sec.
Humidity
sensor
heater
does
not heat up at all
Diode
Transistor
NPN Transistor
Digital Transistor
PNP Transistor
CHECK
ue
~ RESULT.
Short circuit across the sensor
terminals and check the opera-
tion
Heater terminals voltage
-LVT voltage between
$1 and S2
A
K
(ANODE)
-(CATHODE)
—j
(COLLECTOR)
8
(pase)™
E
ECB
(EMITTER)
—ecsB
Ec sB
ced
eaCa
EE |
:
Ee ue ee
EB
{C-B
|
SMALL
___._ FORWARD
_ _
10K
~30kKQ_
50kO~90kKQ
Oven
operates
con-
tinuously until cancel
pad is tapped.
Hea-
ter shut off by itself
-NN-9809, NN-9859, NN-9509
MQssgow, MQB869W
CAUSE/CORRECTIONS.
Humidity sensor
Still oven
stops
op-
eration
at
30
seconds.
Normal AC 5-10V
No voltage
No voltage
oe Normal AC 10~20V
~
AN OHM METER
C6, Q3, IC-1
Humidity sensor hea-
ter open
— STEP 2
D20 triac,IC-1, Q20
FORWARD
REVERSE
.
SMALL
FORWARD
SMALL
SMALL
po
ee
FORWARD
SMALL
40kQ~80kQ
REVERSE
REVERSE
;
REVERSE
10kQ ~30kQ
{
Advertisement
