Hoshizaki dcm-75ibah Ice/Water Dispensing, Ice Dispense-Push Button, Ice Dispense-Opti-Serve

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2. Ice/Water Dispensing

	Ice Dispense-Push Button

1. Power Supply	a) Off, blown fuse, or tripped breaker.

2. Control Board	a) Ice dispense switch circuit open or no power (5VDC) from control
	board.
	b) No power (115VAC) to ice dispense solenoid, ice dispense motor, or
	agitating motor.

3. Ice Dispense Switch	a) Defective.

4. Dispense Mode Switch	a) Defective.

5. Ice Dispense Motor	a) Motor windings.
	b) Mechanical failure.

6. Ice Dispense Solenoid	a) Defective or loose connection.

7. Shutter Assembly	a) Defective.

8. Agitating Motor	a) Motor windings.
	b) Mechanical failure.

	Ice Dispense-Opti-Serve

1. Power Supply	a) Off, blown fuse, or tripped breaker.

2. Control Board	a) No power to dispense mode switch.

	b) Dispense mode switch circuit open.
	c) No power to ice dispense solenoid, ice dispense motor, or agitating
	motor.

3. Infrared Sensor	a) Defective.

4. Dispense Mode Switch	a) Defective (open).

5. Ice Dispense Motor	a) Motor windings.
	b) Mechanical failure.

6. Ice Dispense Solenoid	a) Defective or loose connection.

7. Shutter Assembly	a) Defective.

8. Agitating Motor	a) Motor windings.
	b) Mechanical failure.

	Water Dispense-Push Button

1. Power Supply	a) Off, blown fuse, or tripped breaker.

2. Water Dispense Switch	a) Defective.
3. Water Dispense Valve	a) Water supply turned off.

	b) Defective.

	Water Dispense-Opti-Serve

1. Power Supply	a) Off, blown fuse, or tripped breaker.
2. Infrared Sensor	a) Defective.

3. Control Board	a) No power to infrared sensor.

	b) No power to water dispense valve.

4. Water Dispense Valve	a) Water supply turned off.
	b) Defective.

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Image 31

Contents DCM-751BAH-OS DCM-751BWH-OS Hoshizaki AMERICA, INC Contents Page Important Safety Information Page DCM-751BAH-OS Construction and Water/Refrigeration Circuit DiagramsDCM-751BWH-OS Ice Making Unit Water/Refrigeration Circuit Diagrams Spout Inlet Water Valve Water Supply Float Diagnosis Control Board Sequence Flow Chart DCM-751BH-OSChart OperationDiagnostic Procedure Service DiagnosisIce Production Check Page Page Page Page Control Board Check High-Pressure Switch HPS 5VDC CB K9 Connector See Fig5VDC CB K9 Connector Component Pin # Wire Color Bin Control BC 5VDC CB K8 Connector See Fig5VDC CB K8 Connector Component Pin # Wire Color Gear Motor Protect Relay Gmpr5VDC 0VDC Portion Signal #5 R Red K4 pin closest 5VDC Power Supply #3 W/BK Connector Pin # Wire Color Neutral LBU Open Closed 24VAC CB K2 ConnectorBin Control Check Float Switch Check Float Switch Check and CleaningFloat Switch Cleaning Page No Ice Production Diagnostic TablesNo Ice Production Possible Cause Startup Shutdown No Ice Production Possible CauseWater Dispense-Push Button Ice/Water DispensingIce Dispense-Push Button Ice Dispense-Opti-ServeIII. Controls and Adjustments DCM-751BH Control Board LayoutDCM-751BH-OS K2 Connector Drain Valve #10 W/BUEnergized Components Min Max LED Lights and Audible Alarm SafetiesNo. of Beeps Type of Alarm Reset Options Every 5 sec Icemaking Sequence Sequence StepDrain Frequency Control S1 dip switch Settings and AdjustmentsDefault Dip Switch Settings Infrared Sensor Shutdown Delay S1 dip switch 1, 2Factory Use S1 Dip Switch 9 Continuous Dispensing Timer S1 dip switch 5Bin Control Selector S1 dip switch Bin Control Shutdown Delay S1 dip switchDrain Power Switch, Control Switch, and Dispense Mode SwitchICE OFFContinuous Dispense Mode SwitchPortion Service for Refrigerant Lines IV. Removal and Replacement of ComponentsBrazing Refrigerant RecoveryEvacuation and Recharge R-404A Evaporator Assembly Components. See Fig Important Notes for Component ReplacementEvaporator Assembly Upper Bearing Wear Check Icemaking UnitRemoval and Replacement of Auger Removal and Replacement of Extruding HeadRemoval and Replacement of Evaporator 5b. Lower Housing Removal and Replacement of Gear Motor Dispense Auger and Agitator Dispense ComponentsDispense and Agitating Motors Maintenance Schedule MaintenanceFrequency Area Task VI. Preparing the Appliance for Periods of Non-Use Page VII. Disposal DCM-751BAH VIII. Technical Information Specification SheetsDesign without prior Potable Water WATER-COOLED Condenser DCM-751BWH779 758 Reference without *marks 738 719 ICE Production Performance Data800 363 Wiring Diagrams DCM-751BH-OS