Hoshizaki DCM-271BAH-OS Service Manual page 18

(3) 5VDC CB K7 Connector: See Figs. 3, 4, 5, and 6.
a) Water Dispense
1. Push Button Model
CB K7 pin #3 (W/BK) and pin #8 (P): "WTRDP" LED is on: Before engaging the
water dispense switch, 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 water dispense switch. "WTRDP" LED
turns on. If not, confirm that the water dispense signal VDC matches the "Engaged"
column in the table below. If not, check the water dispense switch continuity when
engaged (closed). If the water dispense switch is open when engaged, replace the
water dispense switch. If the VDC matches the "Engaged" column below and the
"WTRDP" LED does not turn on, replace CB.
Component
5VDC Power Supply
Water Dispense Signal
Red test lead
to CB red
K4 pin #1 (pin
closest to CB
black K3)
5VDC CB K7 Connector
Pin # (Wire Color) To CB VDC Ground
#3 (W/BK)
#8 (P)
Multimeter
5VDC
Red Test Lead
Water Dispense (Y) or (P)
(switch signal)
Fig. 3
Red K4 pin #1
To (closest to CB
black K3)
Black Test Lead
Control Board K7 Connector
Water Dispense (W/BK)
(5VDC power supply)
18
Disengaged Engaged
5VDC 5VDC
0VDC 5VDC