Hoshizaki dcm-75ibah service manual 0VDC

Page 22

g. Opti-ServeModel–"WTRDP" LED is on: Before engaging the water dispense

Opti‑Serve sensor, check for the correct VDC from the locations given in the "Disengaged" column in the table below. If the VDC is different than in the table, replace CB. If the VDC is correct, engage the Opti‑Serve sensor. "WTRDP" LED turns on. If not, confirm that the water dispense signal VDC matches the "Engaged" column in the table below. If not, replace the Opti-Serve sensor. If the VDC matches the "Engaged" column below and the "WTRDP" LED does not turn on, replace CB.

5VDC CB K7 Connector

	Component	Pin # (Wire Color)	To	CB VDC Ground	Disengaged	Engaged
	VDC Sensor Ground	#7 (R)		Red K4 pin closest	0VDC	0VDC
	Water Dispense Signal	#8 (W)	To		0VDC	5VDC
				to black K3
	5VDC Power Supply	#9 (BK)			5VDC	5VDC

Red positive test lead to red K4 connector pin closest

to black K3

Red Positive Test Lead

Multimeter

5VDC

Black Negative
Test Lead	Control Board K7 Connector

connector

Water Dispense (BK)
(5VDC power)
Water Dispense (W)	Water Dispense (R)
(switch signal)	(VDC GND)

Fig. 4

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Contents DCM-751BAH-OS DCM-751BWH-OS Hoshizaki AMERICA, INC Contents Page Important Safety Information Page Construction and Water/Refrigeration Circuit Diagrams DCM-751BAH-OSDCM-751BWH-OS Ice Making Unit Water/Refrigeration Circuit Diagrams Spout Inlet Water Valve Water Supply Float Operation Control Board Sequence Flow Chart DCM-751BH-OSChart DiagnosisDiagnostic 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 Gear Motor Protect Relay Gmpr 5VDC CB K8 Connector See Fig5VDC CB K8 Connector Component Pin # Wire Color Bin Control BC5VDC 0VDC Portion Signal #5 R Red K4 pin closest 5VDC Power Supply #3 W/BK 24VAC CB K2 Connector Connector Pin # Wire Color Neutral LBU Open ClosedBin Control Check Float Switch Check Float Switch Check and CleaningFloat Switch Cleaning Page No Ice Production Diagnostic TablesNo Ice Production Possible Cause Startup No Ice Production Possible Cause ShutdownIce Dispense-Opti-Serve Ice/Water DispensingIce Dispense-Push Button Water Dispense-Push ButtonIII. Controls and Adjustments Control Board Layout DCM-751BHK2 Connector Drain Valve #10 W/BU DCM-751BH-OSIcemaking Sequence Sequence Step LED Lights and Audible Alarm SafetiesNo. of Beeps Type of Alarm Reset Options Every 5 sec Energized Components Min MaxInfrared Sensor Shutdown Delay S1 dip switch 1, 2 Settings and AdjustmentsDefault Dip Switch Settings Drain Frequency Control S1 dip switchBin Control Shutdown Delay S1 dip switch Continuous Dispensing Timer S1 dip switch 5Bin Control Selector S1 dip switch Factory Use S1 Dip Switch 9OFF Power Switch, Control Switch, and Dispense Mode SwitchICE DrainContinuous Dispense Mode SwitchPortion IV. Removal and Replacement of Components Service for Refrigerant LinesBrazing Refrigerant RecoveryEvacuation and Recharge R-404A Important Notes for Component Replacement Evaporator Assembly Components. See FigEvaporator Assembly Icemaking Unit Upper Bearing Wear CheckRemoval and Replacement of Extruding Head Removal and Replacement of AugerRemoval 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 VIII. Technical Information Specification Sheets DCM-751BAHDesign without prior DCM-751BWH Potable Water WATER-COOLED Condenser779 758 Reference without *marks 738 719 Performance Data ICE Production800 363 Wiring Diagrams DCM-751BH-OS