67
4. Troubleshooting
4-2 Electrical Malfunction
FIGURE
TESTS MEASURE
RESULTS
Low Voltage Transformer
Low Voltage Transformer
*
Measure resistance of Primary and
secondary coil .
*
Measure secondary voltage .
*
Make sure whether connector or wire
of low voltage transformer has been
damaged or not .
Approx
Primary coil(white) : 75 ~ 80Ω
secondary coil :
Red : 1.8~2.2Ω, AC 13.5V
yellow: 0 .8~1 .2V, AC 8V
*
Replace or repair if wire of
connetor has been damaged .
Door plunger switch
Door plunger switch
*
Check the state of working of switch .
*
Make sure whether wire, housing
and terminal is connected with switch
has been damaged or not .
Nomal open : 0Ω
Nomal close : Ω
*
Replace or repair if wire or
terminal has been damaged .
Oven Sensor
Oven Sensor
*
Check whether the resistance values
of oven sensor is same with a chart’s
one .
*
Check whether wire or housing has
been loosen or disconnected .
Approx.
at the room temperature
:1080Ω
Oven sensor resistance (Temperature vs . Sensor resistance)
Ro = 1000 Ohms (0˚C), RP = 2757 Ohms, Up = 5V, a = 0.00375
degree F
degree C
ohms
degree F
degree C
ohms
0
-17 .8
932 .12
113
45
1170 .17
14
-10
961 .86
122
50
1188 .93
23
-5
980 .95
212
100
1374 .93
32
0
1000 .00
302
150
1558 .01
41
5
1019 .02
392
200
1738 .06
50
10
1038 .02
482
250
1915 .39
59
15
1056 .99
572
300
2089 .69
68
20
1075 .92
662
350
2261 .07
77
25
1094 .83
752
400
2429 .52
86
30
1113 .71
842
450
2595 .05
95
35
1132 .56
932
500
2757 .65
104
40
1151 .38
1000
538
2878 .57
∞
