Check
SiUS041111
116
Service Diagnosis
5. Check
5.1
Thermistor Resistance Check
Check No.01
Disconnect the connectors of the thermistors from the PCB, and measure the resistance of each
thermistor using tester.
The relationship between normal temperature and resistance is shown in the table and the graph
below.
For the models in which the thermistor is directly mounted on the PCB, disconnect the
connector for the PCB and measure.
Thermistor temperature (°C / °F)
Resistance (k
)
Room temperature thermistor for
09/12 class model
Other thermistors
–20 / –4
73.4
211.0
–15 / 5
57.0
150.0
–10 / 14
44.7
116.5
–5 / 23
35.3
88.0
0 / 32
28.2
67.2
5 / 41
22.6
51.9
10 / 50
18.3
40.0
15 / 59
14.8
31.8
20 / 68
12.1
25.0
25 / 77
10.0
20.0
30 / 86
8.2
16.0
35 / 95
6.9
13.0
40 / 104
5.8
10.6
45 / 113
4.9
8.7
50 / 122
4.1
7.2
(R25°C (77°F) = 10 k
,
B = 3435 K)
(R25°C (77°F) = 20 k
,
B = 3950 K)
(11906)
Other thermistors
Room temperature thermistor
for 09/12 class model
5
32
59
86
113
(˚C)
(˚F)
5
32
59
86
113 (˚F)
(˚C)
50
25
0
–15
0
15
30
45
(k
Ω
)
(k
Ω
)
Tester
Resistance range
(R11906)
RTH1
Tester
(R3460)
