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2) 5VDC Output Checks: There are seven 5VDC circuits on the appliance, "DRAIN"
position through control switch, high-pressure switch (HPS), gear motor protect
relay(GMPR), bin control (BC), oat switch (FS), ice dispense switch, and water
dispense switch.
• 5VDC CB K9 Connector: See Fig. 1.
5VDC CB K9 Connector
Component Pin # (Wire Color)
"DRAIN" Position Through Control Switch #1 (W/BK) and #2 (W/BK)
High-Pressure Switch (HPS) #3 (Y) and #4 (Y)
Gear Motor Protect Relay (GMPR)
(terminals #3 and #5)
#5 (W/O) and #6 (W/O)
Red positive
test lead to
redK4 connector
pin closest
to black K3
connector
Fig. 1
Control Board K9 Connector
Red Positive
Test Lead
Black Negative
Test Lead
Multimeter
5VDC
"DRAIN" Position on
Control Switch
(W/BK)
High-Pressure Switch (HPS)
(Y)
Gear Motor Protect Relay (GMPR)
Terminals #3 and #5 (W/O)
a. "DRAIN" Position on Control Switch
CB K9 connector pins #1 and #2 (W/BK):
• When control switch is in the "ICE" position, CB K9 connector pin#1and pin #2are
open. 5VDC is present between CB K9 connector pin #1(W/BK) and pin
#2 (W/BK). If not, conrm 5VDC between pin#1 (W/BK) and CBred K4 connector,
pin closest to CBblack K3connector. If 5VDC is not present, replace CB.
• When control switch is in the "DRAIN" position, CB K9 connector pin #1 (W/BK)
and pin#2(W/BK) are closed. 5VDC is present between both CB K9 connector
pin #1(W/BK) and pin#2 (W/BK) to CBred K4connector, pin closest to CB black
K3 connector. If 5VDC is not present, replace CB.
b. High-Pressure Switch (HPS)
CB K9 connector pins #3 (Y) and #4 (Y): When HPS is closed, 5VDC is present
between both CB K9 connector pins #3 (Y) and pin #4 (Y) to CB red K4 connector
pin closest to CB black K3 connector. If5VDC is not present on pin #3 (Y) or pin
#4(Y), replace CB. If 5VDC is present on CBK9 connector pin #3 (Y) and not on
CB K9connector pin #4 (Y), HPS is most likely open. CB sounds a 3-beep alarm.
Check HPS continuity. If HPS is open and CB is not in alarm, replace CB.