Hoshizaki DCM-270BAH Service Manual page 18

2c) 5VDC CB K7 Connector: See Figs. 3, 4, 5, and 6.
a) Water Dispense
1. Push Button Model
CB K7 connector pins #3 (W/BK) and #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 positive
test lead to red
K4 connector
pin closest
to black K3
connector
5VDC CB K7 Connector
Pin # (Wire Color) To CB VDC Ground
#3 (W/BK)
To
#8 (P)
Multimeter
5VDC
Red Positive
Test Lead
Water Dispense (P)
(switch signal)
Fig. 3
18
Disengaged Engaged
Red K4 pin closest
to black K3
Black Negative
Test Lead
Control Board K7 Connector
Water Dispense (W/BK)
(5VDC power supply)
5VDC 5VDC
0VDC 5VDC