Hoshizaki DCM-271BAH-OS Service Manual page 17

(2) 5VDC CB K8 Connector: See Fig. 2.
a) Bin Control (BC)
CB K8 pin #3 (GY) and pin #4 (GY): When BC is closed (icemaking), 5VDC is present
between CB K8 pin #3 (GY) and pin #4 (GY) to CB red K4 pin #1 (pin closest to CB
black K3). 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."
b) Float Switch (FS): Upper (UFS) and Lower (LFS):
CB K8 pin #5 common (BK), pin #6 UFS (R), and pin #7 LFS (BU): 5VDC is present
between CB K8 pin #5 common (BK) and CB red K4 pin #1 (pin closest to CB
black K3) at all times. If 5VDC is not present, replace CB. For further float switch
diagnostics, see "II.E. Float Switch Check and Cleaning."
Red test lead
to CB red
K4 pin #1 (pin
closest to CB
black K3)
Lower Float Switch (LFS) (BU)
5VDC CB K8 Connector
Component
Bin Control (BC)
Float Switch (FS) Common #5 (BK) Common
Upper Float Switch (UFS)
Lower Float Switch (LFS)
Red Test Lead
Float Switch (FS) Common (BK)
Upper Float Switch (UFS) (R)
Fig. 2
17
Pin # (Wire Color)
#3 (GY) and #4 (GY)
#6 (R)
#7 (BU)
Multimeter
5VDC
Black Test Lead
Bin Control (GY)
Control Board K8 Connector