[B] Before Checking Controller Board [B] Before Checking Controller Board - Hoshizaki IM-240DME Service Manual

[b] BEFORE CHECKING CONTROLLER BOARD [b] BEFORE CHECKING CONTROLLER BOARD
Check the power source voltage and the components as shown in the table below. Check the power source voltage and the components as shown in the table below.
Component Component
1. Actuator Toggle 1. Actuator Toggle
Switch Switch
COM. . COM
N.O. N.O.
N.C. N.C.
DEFROST DEFROST FREEZE FREEZE
2. Thermistor 2. Thermistor
(on Evaporator) (on Evaporator)
Holder Holder
Screw Screw
Evaporator Evaporator
Thermistor Thermistor
3. Bin Control Switch 3. Bin Control Switch
Procedure Procedure
Manually set the switch in the FREEZE Manually set the switch in the FREEZE
and DEFROST positions, and check the and DEFROST positions, and check the
continuity. continuity.
CAUTION CAUTION
Thermistor Sensor part is fragile, Thermistor Sensor part is fragile,
glass sealed. Handle with care. glass sealed. Handle with care.
* Disconnect the Connector K4 on the * Disconnect the Connector K4 on the
board. board.
* Remove the screw and the Thermistor * Remove the screw and the Thermistor
Holder on the Evaporator. Holder on the Evaporator.
* Immerse the Sensor part in a glass * Immerse the Sensor part in a glass
containing ice and water for 5 minutes. containing ice and water for 5 minutes.
* Check the resistance between K4 * Check the resistance between K4
Connector Pins. Connector Pins.
* Replace the Thermistor in its correct * Replace the Thermistor in its correct
position. position.
* Connect K4. * Connect K4.
Manually set the Micro Switch in the Manually set the Micro Switch in the
TRIP and RESET positions, and check TRIP and RESET positions, and check
the period. the period.
16 16
Normal Normal
DEFROST DEFROST
COM-NO COM-NO Open Open
COM-NC COM-NC Close Close
FREEZE FREEZE
COM-NO COM-NO Close Close
COM-NC COM-NC Open Open
5 -7 kilohms 5 -7 kilohms
Approx. Approx.
TRIP(Closed) 10 sec. TRIP(Closed) 10 sec.
RESET(Open) 80 sec. RESET(Open) 80 sec.
E1CG4880210 E1CG4880210