Thermistor Check - Hoshizaki KMD-450MAH Service Manual

E. Thermistor Check
To check thermistor resistance, follow the steps below.
1) Turn off the power supply.
2) Remove the front panel, then move the control switch to the "OFF" position.
3) Remove the control box cover.
4) Disconnect the wire connector from the control board K1 nine-pin connector. See "II.
C.1. Control Board Layout." Make sure the thermistor connection on the side of the
control box is secure.
5) Remove the plastic cable ties, foam insulation, thermistor holder, and thermistor. See
Fig. 9.
6) Immerse the thermistor sensor portion in a glass containing ice and water for 2 or
3 minutes.
7) Check the resistance between the orange wires (6 & 7) of the wire connector. Normal
reading is within 4.7 to 6.2 kΩ. If outside the normal reading, replace the thermistor.
See "V.J. Removal and Replacement of Thermistor." If inside the normal reading,
continue to the next step.
8) Scrape away the old sealant on the thermistor holder and the suction pipe.
9) Wipe off any moisture on the suction pipe.
10) Smoothly apply recommended sealant (KE4560RTV, Part Code 60Y000-11 or
4A0683-01) to the thermistor holder concave.
11) Attach the thermistor to the suction pipe in the same position as previous. Be very
careful to prevent damage to the leads. Secure it using the thermistor holder and foam
insulation.
12) Secure the insulation using plastic cable ties.
13) Reconnect the wire connector to the control board K1 nine-pin connector, then replace
the control box cover in its correct position.
14) Move the control switch to the "ICE" position.
15) Replace the front panel in its correct position, then turn on the power supply.
16) Once the harvest cycle starts, begin timing the harvest cycle.
17) The harvest timer should expire and terminate the harvest cycle within 2 to 3 minutes.
If the harvest timer does not expire and terminate the harvest cycle, the harvest timer is
bad and the control board should be replaced. See "V.N. Removal and Replacement of
Control Board."
Cable Tie
Fig. 9
Foam Insulation
41
Thermistor Holder
Thermistor Lead