Hoshizaki DCM 300BAH(-OS) service manual Ice Dispense Controls

•Icemaking Control Circuit: The icemaking control circuit consists of WCR, CS, and

BC. The icemaking control circuit activates once UF/S closes. Once CB reads a closed circuit through WCR, CS, and BC, CB then starts the 60-sec. ice purge cycle (GM operation). Once UF/S closes, WCR energizes, closing contacts between WCR terminals #4 (GY wire) and #6 (O wire). CS must be in the "ICE" position (O wires). BC proximity switch must be closed (O and V wires) to complete the icemaking circuit between CB K4 connector pin #3 (GY wire) and #4 (V wire). Diagnosis: Confirm UF/S has closed and WCR energizes. Next, check for 5VDC from CB K4 connector pin

#3 (GY wire) and CB K4 connector pin #4 (V wire) to CB K3 connector pin #1 (open). If 5VDC is not present on CB K4 connector pin #3 (GY wire) or pin #4 (V wire), replace CB. If 5VDC is present on one and not the other, check continuity on WCR terminals #4 and #6, CS, and BC.

•Freeze Protect Circuit (GMPR): Once 60-sec. ice purge cycle starts, GM and

GMPR energize, closing GMPR pins #3 (BR wire) and #5 (DBU wire). CB circuit

K2 connector pin #1 (DBU wire) and #2 (BR wire) is now closed. Once 60-sec. ice purge timer terminates, CB energizes Comp. If this circuit is open, Comp cannot energize. Diagnosis: Check for 5VDC at CB K2 connector pin #1 (DBU wire) and CB K2 connector pin #2 (BR wire) to CB K3 connector pin #1 (open). If 5VDC is not present on either pin, replace CB. If 5VDC is present on one and not the other, confirm GMPR is energized and terminals #3 and #5 contacts are closed. If 5VDC is present on both, once 60-sec. ice purge timer terminates, Comp and FM start. If not, replace CB.

•Ice Dispense Controls:

a)Push Button Model – "DM" and "AM" LEDs are on: Ice Dispense Switch, Dispense Mode Switch ("CONTINUOUS" or "PORTION")–When the ice dispense mode switch is pressed, "DM" LED is on. Circuit is closed between CB K4 connector pin #6 (BK wire) and #8 (BK wire) to #7 (GY wire) or #5 (P wire) depending on dispense mode switch ("CONTINUOUS" or "PORTION"). Diagnosis: Check for 5VDC from CB

K4 connector pin #6 (BK wire) or pin #8 (BK wire) to CB K3 connector pin #1 (open). If 5VDC is not present, replace CB. If 5VDC is present, press and hold the ice dispense button. DS and DM should energize. If not, check for 115VAC at CB K2 connector pin #6 (LBU wire) to a neutral (W wire). If 115VAC is not present, check as outlined below. If 115VAC is present, check DS, DM winding, and DM auger for binding.

(1)"CONTINUOUS" Mode: Engage the ice dispense button, then check for 5VDC from CB K4 connector to pin #5 (P wire) to CB K3 connector pin #1 (open). If 5VDC is not present, check ice dispense switch and DMS continuity.

(2)"PORTION" Mode: Engage the ice dispense button, then check for 5VDC from CB K4 connector pin #7 (GY wire) to CB K3 connector pin #1 (open). If 5VDC is not present, check the ice dispense switch and DMS continuity.

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