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Fabricar: Hoshizaki Tamaño del archivo: 3.03 mb Nombre del archivo: Idioma del manual:

Counter Reset Button (not used in this application) Portion Control Timer "WTR" LED (X5 Relay) Dispensing Water Valve "FLUSH" LED (X6 Relay) Drain Valve 4V Supply Out Microprocessor (board revision level indicated by last digits on label) "ICE" LED (X4 Relay) Shutter Solenoid, Dispensing Auger Motor 4V In 5V In Drain Valve 4V In 4V Out Dispensing Dispensing Motor Water Valve 5V Out 4V Out Bin Control, Control Switch, Low Water Safety High Pressure Switch "AM" LED (X3 Relay) Agitating Motor "COMP" LED (X Relay) Compressor, Fan Motor "POWER" LED (lights when power is supplied to the board) "GM" LED (X Relay) Gear Motor 5V In 5V In Circuit Gear Motor Agitating Motors 5V Out 5V Out Gear Motor Protect Relay 0.5V Transformer Control Board Part Number A 649-0 2. Features The control board provides the following safeguards: • Provides component protection during low water supply. • Purges remaining ice in the evaporator at startup and shutdown. • Provides short cycle protection for the compressor. a) LED Lights The "POWER" LED indicates control voltage and will remain on unless a control voltage problem occurs. An LED illuminates for each relay as it is energized. For more information, see "II.C. Sequence of Operation." Icemaking Cycle (Relay) LED Energized Components Time LEDs are On Frequency LEDs are On Fill POWER only WV N/A As Needed Ice Purge (X ) GM GM, HTR 60 seconds N/A Freeze (X , X ) GM, COMP GM, HTR, Comp, FMS N/A N/A Drain Valve (X6) FLUSH DV 0 Minutes Every Hours Dispensing Relay LED Energized Component Time LEDs are On Frequency LEDs are On Ice Dispense (X4) Push Button DM IDM 60 seconds maximum N/AOpti Serv ICE Agitating Motors (X3) AM AM .6 seconds Every seconds of accumulative dispense time Water Dispense (X5) (Opti Serv Only) WTR WTR N/A N/A Legend: AM–agitating motors, Comp–compressor; DV–drain valve; FMS–self-contained fan motor; GM–gear motor; HTR–extruding head heater; IDM–ice dispensing motor, shutter solenoid; WTR–dispensing water valve; WV–inlet water valve 7 18 3. Controls and Adjustments a) Portion Control When the dispense mode switch is placed in the "PORTION" position, a variable resistor (located on the control board) controls the ice dispense time. The figures on the label indicate dispensing time (sec.). When shipped, the portion control is set at the minimum dispensing time (0.6 sec.). DCM-750BAH(-OS), DCM-750BWH(-OS). . . . . . .Approximately 0.72 oz. Amount of ice dispensed per second. DCM-750BAH(-OS), DCM-750BWH(-OS) . . . . . . Approximately 1.2 oz. 4. Control Board Check Procedure Before replacing a control board that does not show a visible defect and that you suspect is bad, always conduct the following check procedure. This procedure will help you verify your diagnosis. a) Power Supply 1. Move the control switch to the "ICE" position. The "POWER" LED should come on. If the "POWER" LED is off, check that the power supply is on, the power switch is in the "ON" position, the door switch is engaged, and the control switch is in the "ICE" position. Check the transformer 10.5V secondary circuit and fuse. If the 10.5V secondary circuit (K4 pins 1 and 2) has proper voltage and the "POWER" LED is off, the control board is bad and should be replaced. If the secondary circuit does not have proper voltage, see "IV.C.1.[1] The icemaker will not start (Fill Cycle)" for further details. b) Ice Making Components 1. Confirm the reservoir is full of water. If no water is in the reservoir, make sure that the control switch is not in the "DRAIN" position and that the unit is not in the 12 hour drain cycle. Also check the water supply line, water shutoff valve, and water filters. In the fill cycle, the "POWER" LED is the only LED lit on the control board. If no water is filling the reservoir, check for 24V at connector K2 terminal 7 to neutral and connector K3 (DBU) to neutral. If there is 24V at connector K2 terminal 7 to neutral and no voltage at K3 (DBU) to neutral, the control board is bad and should be replaced. See "IV.C.1.[1] The icemaker will not start (Fill Cycle)" for further details. 2. When the reservoir is full, the "GM" LED comes on and the gear motor starts. If the "GM" LED does not come on or the gear motor does not start, check that the following safety circuits are closed: a) high pressure switch (DCM-750BAH and DCM.750BWH, connector K4 terminals 9 and 10, DCM-750BAH-OS and DCM-750BWH.OS, connector K4 terminals 5 and 6), b) low water safety/bin control/ice making switch circuit (connector K4 terminals 3 and 4). Next, check for 11 5/12 0V at connector K1 "COM" and K1 "NO" on the control board to neutral. If the "GM" LED is on and there is voltage at K1 "COM" to neutral and no voltage at K1 "NO" to neutral, the control board is bad and should be replaced. See wiring diagram "III.C.2. Ice Purge Cycle" for further details. 3. 60 seconds after the "GM" LED comes on, the "COMP" LED comes on, and the compressor and fan motor start. If the "COMP" LED does not come on 60 seconds after...

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