Hoshizaki Modular Cubelet Serenity Series Service Manual page 23

4) 5VDC Output Checks:
CB K9 Connector: Control Switch (CB K9 #1 and #2) (open contacts for icemaking,
closed contacts for drain), Jumper (CB K9 #3 and #4), Compressor Control Relay
(K9 #5 and #6).
Float Switch (K8 #5 (common), #6 (upper), and #7 (lower)).
When checking 5VDC control voltage, always place the red positive test lead from
the multimeter to the CB white K5 pin closest to the CB red K4 connector. See Fig. 2.
Then place the black negative test lead from the multimeter to the corresponding pin to
complete the 5VDC check.
Red positive test lead to white
K5 connector pin closest to
red K4 connector
Red Positive
Test Lead
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 from CB K9 #1 (W/BK) to 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. 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 #5 (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 #5 (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."
5VDC
Black Negative
Test Lead
Multimeter
Control Board K9 Connector
Fig. 2
23
Control Switch
white/black (W/BK)
Yellow Jumper (Y)
Compressor Control Relay
(terminals #3 and #5)
white/orange (W/O)