Hoshizaki F-500BAJ Service Manual page 20

a) Control Switch – CB K9 #1 (W/BK) and CB K9 #2 (W/BK): 5VDC is present
between CB white K5 connector, pin closest to CB red K4 connector and CB K9
#1 (W/BK) at all times. If 5VDC is not present, replace CB. When the control switch is
in the "ICE" position, the control switch contacts are open. 0VDC is present between
CB white K5 connector, pin closest to CB red K4 connector and CB K9 #2 (W/BK).
When in the "ICE" position, 5VDC is present between CB K9 #1 (W/BK) to CB K9
#2 (W/BK). When the control switch is in the "DRAIN" position, the control switch
contacts are closed. 5VDC is present between CB white K5 connector, pin closest
to CB red K4 connector, to CB K9 #1 (W/BK) or #2 (W/BK). If 5VDC is not present,
replace CB. 0VDC is present from CB K9 #1 (W/BK) to CB K9 #2 (W/BK).
b) High-Pressure Switch – CB K9 #3 (Y) and CB K9 #4 (Y): 5VDC is present between
CB K5 connector, pin closest to CB red K4 connector and CB K9 #3 (Y) at all times.
When the high-pressure switch is closed, 5VDC is present between CB K5 pin
closest to CB K4 connector to CB K9 #3 (Y) and CB K9 #4 (Y). If 5VDC is not
present, replace CB. When the high-pressure switch is closed, 0VDC is present at
CB K9 #3 (Y) to CB K9 #4 (Y). When the high-pressure switch is open, 5VDC is
present at CB K9 #3 (Y) to CB K9 #4 (Y). If the high-pressure switch is open and
CB is not in alarm, replace CB. If 5VDC is present at CB K9 #3 (Y) and not at CB
K9 #4 (Y), the high-pressure switch is open and CB sounds a 3-beep alarm. Check
continuity across the high-pressure switch (CB K9 #3 (Y) and CB K9 #4 (Y)).
c) Compressor Control Relay (CCR) – CB K9 #5 (W/O) and CB K9 #6 (W/O):
5VDC is present from CB white K5 connector, pin closest to CB red K4 connector
to CB K9 #5 (W/O) at all times. If 5VDC is not present, replace CB. When CCR
terminals #3 (W/O) and #4 (W/O) are open (CCR de-energized), 5VDC is present
between CB K9 #5 (W/O) and CB K9 #6 (W/O). When CCR terminals #3 (W/O) and
#4 (W/O) are closed (CCR energized), 5VDC is present between CB K9 #5 (W/O)
and CB K9 #6 (W/O). When CCR terminals #3 (W/O) & #5 (W/O) are open CB may
be in an 8-beep alarm. See "III.A.2. LED Lights and Audible Alarm Safeties."
d) Bin Control – CB K8 #3 (GY) and CB K8 #4 (GY): 5VDC is present from CB white
K5 connector, pin closest to CB red K4 connector to CB K8 #3 (GY) at all times.
If 5VDC is not present, replace CB. When BC is closed (calling for ice), 5VDC is
present from CB white K5 connector, pin closest to CB red K4 connector, to CB K8
#3 (GY) and CB K8 #4 (GY). If 5VDC is not present to either CB K8 #3 (GY) or CB
K8 #4 (GY), replace CB. If 5VDC is present at CB K8 #3 (GY) and not to CB K8 #4
(GY), BC(2) is open. See "II.D. Bin Control Check."
e) Float Switch (LFS and UFS) – CB K8 #5 (BK) (common), CB K8 #6 (R) (upper),
and CB K8 #7 (BU) (lower): 5VDC is present from CB white K5 connector pin closest
to CB red K4 connector to CB K8 #5 (BK) (common) at all times. If not, replace CB.
5VDC is present from CB white K5 connector pin closest to CB red K4 connector
to CB K8 #6 (R) (upper) and CB K8 #7 (BU) (lower) when FS is open. If 5VDC
is present between CB K8 #5 (BK) and CB K8 #6 (R) (upper) or CB K8 #7 (BU)
(lower), FS is open. For further FS diagnostics, see "II.E. Float Switch Check and
Cleaning."
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