III. Controls and Adjustments | Hoshizaki dcm-75ibah specification

III. Controls and Adjustments

•A Hoshizaki exclusive control board is employed in the DCM-751 series.

•All models are pretested and factory set.

•For a control board check procedure, see "II.C. Control Board Check."

NOTICE

•Fragile, handle very carefully.

•The control board contains integrated circuits, which are susceptible to failure due to static discharge. It is especially important to touch the metal part of the appliance when handling or replacing the control board.

•Do not touch the electronic devices on the control board or the back of the control board.

•Do not change wiring and connections. Do not misconnect terminals.

•Do not short out power supply to test for voltage.

•Always replace the whole control board assembly if it goes bad.

32

Image 32

Hoshizaki dcm-75ibah service manual III. Controls and Adjustments

Contents

DCM-751BAH-OS DCM-751BWH-OS Hoshizaki AMERICA, INC Contents Page Important Safety Information Page Construction and Water/Refrigeration Circuit Diagrams DCM-751BAH-OS DCM-751BWH-OS Ice Making Unit Water/Refrigeration Circuit Diagrams Spout Inlet Water Valve Water Supply Float Control Board Sequence Flow Chart DCM-751BH-OS ChartOperation Diagnosis Ice Production Check Service DiagnosisDiagnostic Procedure Page Page Page Page Control Board Check 5VDC CB K9 Connector Component Pin # Wire Color 5VDC CB K9 Connector See FigHigh-Pressure Switch HPS 5VDC CB K8 Connector See Fig 5VDC CB K8 Connector Component Pin # Wire ColorGear Motor Protect Relay Gmpr Bin Control BC 5VDC 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 Closed Bin Control Check Float Switch Cleaning Float Switch Check and CleaningFloat Switch Check Page No Ice Production Possible Cause Startup Diagnostic TablesNo Ice Production No Ice Production Possible Cause Shutdown Ice/Water Dispensing Ice Dispense-Push ButtonIce Dispense-Opti-Serve Water Dispense-Push Button III. Controls and Adjustments Control Board Layout DCM-751BH K2 Connector Drain Valve #10 W/BU DCM-751BH-OS LED Lights and Audible Alarm Safeties No. of Beeps Type of Alarm Reset Options Every 5 secIcemaking Sequence Sequence Step Energized Components Min Max Settings and Adjustments Default Dip Switch SettingsInfrared Sensor Shutdown Delay S1 dip switch 1, 2 Drain Frequency Control S1 dip switch Continuous Dispensing Timer S1 dip switch 5 Bin Control Selector S1 dip switchBin Control Shutdown Delay S1 dip switch Factory Use S1 Dip Switch 9 Power Switch, Control Switch, and Dispense Mode Switch ICEOFF Drain Portion Dispense Mode SwitchContinuous IV. Removal and Replacement of Components Service for Refrigerant Lines Evacuation and Recharge R-404A Refrigerant RecoveryBrazing Important Notes for Component Replacement Evaporator Assembly Components. See Fig Evaporator Assembly Icemaking Unit Upper Bearing Wear Check Removal and Replacement of Extruding Head Removal and Replacement of Auger Removal and Replacement of Evaporator 5b. Lower Housing Removal and Replacement of Gear Motor Dispense and Agitating Motors Dispense ComponentsDispense Auger and Agitator Frequency Area Task MaintenanceMaintenance Schedule VI. Preparing the Appliance for Periods of Non-Use Page VII. Disposal VIII. Technical Information Specification Sheets DCM-751BAH Design without prior DCM-751BWH Potable Water WATER-COOLED Condenser 779 758 Reference without *marks 738 719 Performance Data ICE Production 800 363 Wiring Diagrams DCM-751BH-OS