Service Manual
ManualsBrandsHoshizaki ManualsCommercial Countertop Ice Makers and DispensersDCM-751BAH 35" Stanitary Cubelet Ice Machine and Dispenser with 801 lbs. Daily Ice Production, Built-In 70 lbs. Ice Storage, Corrosion Resistant Stainless Steel Exterior, Advanced CleanCycle24 Design, and Push Button Operation: Stainless Steel
Table Of Contents
- Important Safety Information
- I. Construction and Water/Refrigeration Circuit Diagrams
- II. Sequence of Operation and Service Diagnosis
- III. Controls and Adjustments
- A. Control Board Layout
- B. LED Lights and Audible Alarm Safeties
- C. Settings and Adjustments
- 1. Default Dip Switch Settings
- 2. Infrared Sensor Shutdown Delay (S1 dip switch 1, 2, 3)
- 3. Drain Frequency Control (S1 dip switch 4)
- 4. Continuous Dispensing Timer (S1 dip switch 5 & 6)
- 5. Bin Control Selector (S1 dip switch 7)
- 6. Bin Control Shutdown Delay (S1 dip switch 8)
- 7. Factory Use (S1 Dip Switch 9 & 10)
- D. Power Switch, Control Switch, and Dispense Mode Switch
- IV. Removal and Replacement of Components
- V. Maintenance
- VI. Preparing the Appliance for Periods of Non-Use
- VII. Disposal
- VIII. Technical Information
29
F. Diagnostic Tables
Before consulting the diagnostic tables, check for correct installation, proper voltage per
appliance nameplate, and adequate water pressure (10 to 113 PSIG). Check control
board using the steps in "II.C. Control Board Check."
1. No Ice Production
No Ice Production - Possible Cause
Startup
1. Power Supply a) Off, blown fuse, or tripped breaker.
b) Loose connection.
c) Not within specications.
2. Power Switch a) "OFF" position.
b) Defective.
3. Safety Switch a) Safety switch not engaged.
b) Defective.
4. Power Protect Relay a) Energized. Voltage not within specications.
b) Defective.
5. Control Transformer a) Coil winding open or shorted.
6. 1A 24VAC Fuse (Control Box) a) Blown.
7. Control Board
See "II.C. Control Board Check"
a) In alarm. See "III.B. LED Lights and Audible Alarm Safeties."
b) Defective.
8. Control Switch a) In "DRAIN" position.
b) Bad contacts.
9. Bin Control a) Tripped with bin lled with ice.
b) Proximity switch defective.
c) Actuator paddle does not move freely.
10. High-Pressure Switch a) Control board in 3 or 4-beep alarm. See "III.B. LED Lights and
Audible Alarm Safeties."
Fill Cycle
1. Control Board a) No power to inlet water valve.
b) No power to oat switch or not reading oat switch condition.
2. Inlet Water Valve a) Screen or orice clogged.
b) Coil winding.
3. Water Supply a) Water supply off or improper water pressure.
b) External water lters clogged.
4. Float Switch a) Float does not move freely.
b) Defective.
5. Drain Valve a) Sticking.
Ice Purge Cycle
1. Control Board a) No power to gear motor.
b) No power to gear motor protect relay circuit (5VDC).
2. Gear Motor a) 3A fuse blown.
b) Internal protector open.
c) Motor winding.
d) Mechanical failure.
3. Coupling a) Defective.
4. Gear Motor Protect Relay a) Defective.