Hoshizaki DCM-270BAH Service Manual page 21

2. Opti-Serve Model
CB K8 connector pins #1 (W/R), #2 (Y), and #3 (W/BK): Before engaging the ice
dispense OS sensor, check for the correct VDC from the locations given in the
"Disengaged" column in the table below. If the VDC is different than in the table,
replace CB. If the VDC reading is correct, engage the OS sensor. "ICE" LED turns
on. If not, confirm that the ice dispense signal VDC matches the "Engaged" column
in the table below. If not, replace the OS sensor. If the VDC matches the "Engaged"
column below and the "ICE" LED does not turn on, replace CB.
Component
VDC Sensor Ground
Ice Dispense Signal
5VDC Power Supply
Red positive
test lead to red
K4 connector
pin closest
to black K3
connector
5VDC CB K7 Connector
Pin # (Wire Color) To
#1 (W/R)
To
#2 (Y)
#3 (W/BK)
Multimeter
5VDC
Red Positive
Test Lead
Ice Dispense (W/BK)
(5VDC power supply)
Fig. 6
21
CB VDC Ground Disengaged
Red K4 pin closest
to black K3
Black Negative
Test Lead
Control Board K7 Connector
Ice Dispense (W/R)
(VDC ground)
Ice Dispense (Y)
(ice dispense signal)
Engaged
0VDC 0VDC
0VDC 5VDC
5VDC 5VDC