Hoshizaki dcm-75ibah Gear Motor Protect Relay Gmpr, 5VDC CB K8 Connector See Fig, Bin Control BC

c. Gear Motor Protect Relay (GMPR)

CB K9 connector pins #5 (W/O) and #6 (W/O): When GMPR is de‑energized, GMPR terminals #3 and #5 are open and 5VDC is present between

CB K9 connector pin #5 (W/O) and CB red K4 connector pin closest to CB black K3 connector. If 5VDC is not present, replace CB. When GMPR is energized, GMPR terminals #3 and #5 are closed and 5VDC is present between CB K9 connector pin #5 (W/O) and pin #6 (W/O) to CB red K4 connector pin closest to CB black

K3 connector. If GM is energized and GMPR terminals #3 & #5 are open, an 8-beep alarm occurs. See "III.B. LED Lights and Audible Alarm Safeties."

•5VDC CB K8 Connector: See Fig. 2.

5VDC CB K8 Connector

Component	Pin # (Wire Color)
Bin Control (BC)	#3 (GY) and #4 (GY)
Float Switch (FS) Common	#5 (BK) Common
Upper Float Switch (UFS)	#6 (R)
Lower Float Switch (LFS)	#7 (DBU)

d. Bin Control (BC)

CB K8 connector pins #3 (GY) and #4 (GY): When BC is closed (calling for ice), 5VDC is present between CB K8 connector pin #3 (GY) and pin #4 (GY) to CB red K4 connector pin closest to CB black K3 connector. If 5VDC is not present on either pin, replace CB. If 5VDC is present on pin #3 (GY) and not on pin #4 (GY), BC is open. See "II.D. Bin Control Check."

e. Float Switch (FS): CB K8 connector pins #5 common (BK), #6 UFS (R), and #7 LFS (DBU): 5VDC is present between CB K8 connector pin #5 common (BK) and CB red K4 connector pin closest to CB black K3 connector at all times. If 5VDC is not present, replace CB. For further float switch diagnostics, see "II.E. Float Switch Check and Cleaning."

Red positive test lead to red K4 connector pin closest

to black K3 connector

Red Positive Test Lead

Multimeter

5VDC

Black Negative

Test Lead

Control Board K8 Connector

Lower Float Switch (LFS) (DBU)	Bin Control (GY)
	Float Switch (FS) Common (BK)

Upper Float Switch (UFS) (R) Fig. 2

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