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2. Opti-Serve Model
CB K8 connector pins #7 (R), #8 (P), and #9(BK): Before engaging the water
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 is correct, engage the OS sensor. "WTRDP" LED turns on.
If not, conrm that the water 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 "WTRDP" LED does not turn on, replace CB.
5VDC CB K7 Connector
Component Pin # (Wire Color) To CB VDC Ground Disengaged Engaged
VDC Sensor Ground #7 (R)
To
Red K4 pin closest
to black K3
0VDC 0VDC
Water Dispense Signal #8 (P) 0VDC 5VDC
5VDC Power Supply #9 (BK) 5VDC 5VDC
Red positive
test lead to red
K4 connector
pin closest
to black K3
connector
Fig. 4
Red Positive
Test Lead
Black Negative
Test Lead
Multimeter
5VDC
Control Board K7 Connector
Water Dispense (P)
(switch signal)
Water Dispense (R)
(VDC GND)
Water Dispense (BK)
(5VDC power)