6.5.4REPLACING THE HEATER PLATE THERMISTOR

If the device has shown a thermistor fault, the resistance of the thermistor(s) can be checked at known temperatures against the resistance-temperature table (Table 8 below).

Table 8: Thermistor resistance temperature table

 

 

 

Temperature

 

 

Resistance

 

 

Temperature

 

 

Resistance

 

 

 

 

 

 

 

 

 

 

 

 

 

 

°C

 

 

°F

 

 

Ω

 

°C

 

 

°F

 

 

Ω

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5

 

41.0

 

22916

 

32

 

89.6

 

7676

 

 

 

10

 

50.0

 

18422

 

33

 

91.4

 

7398

 

 

 

15

 

59.0

 

14922

 

34

 

93.2

 

7133

 

 

 

20

 

68.0

 

12174

 

35

 

95.0

 

6878

 

 

 

21

 

69.8

 

11698

 

40

 

104

 

5756

 

 

 

22

 

71.6

 

11244

 

45

 

113

 

4843

 

 

 

23

 

73.4

 

10810

 

50

 

122

 

4098

 

 

 

24

 

75.2

 

10396

 

55

 

131

 

3484

 

 

 

25

 

77.0

 

10000

 

60

 

140

 

2977

 

 

 

26

 

78.8

 

9622

 

65

 

149

 

2556

 

 

 

27

 

80.6

 

9263

 

70

 

158

 

2204

 

 

 

28

 

82.4

 

8915

 

75

 

167

 

1908

 

 

 

29

 

84.2

 

8584

 

80

 

176

 

1660

 

 

 

30

 

86.0

 

8268

 

85

 

185

 

1449

 

 

 

31

 

87.8

 

7965

 

90

 

194

 

1269

 

6

NOTE: Heater plate thermistor(s) will be required (part number 095 428 870).

1.Open the case and remove the PCB (refer to § 6.2).

2.Remove the heater plate (§ 6.5.2). Refer to Figure 8.2 for the exploded diagram.

3.Cut the two cable ties securing the thermistors (refer to Figure 6.7).

4.Remove the screw holding the heater plate thermistors (refer to Figure 6.8).

5.Place the new heater plate thermistor and screw it down.

Orientation of cable tie closest to Heater Plate

Heater Plate harness cable

ties

Thermistor cable tie

Figure 6.7: Location of cable ties securing heater plate harness

24

MR810 Technical Manual Rev C REF 185042601