Hoshizaki SRC-14H 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/Gear
Motor Protect Relay (K9 #5 and #6).
CB K8 Connector: Bin Control 2 (K8 #3 and #4) and Float Switch (K8 #5 (common),
#6 (lower), and #7 (upper)).
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 connecotor
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 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/Gear Motor Protect Relay (CCR/GMPR) –
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/GMPR terminals #3 (W/O) and #4 (W/O) are open
(CCR/GMPR de-energized), 5VDC is present between CB K9 #5 (W/O) and CB K9
#6 (W/O). When CCR/GMPR terminals #3 (W/O) and #4 (W/O) are closed (CCR/
GMPR energized), 5VDC is present between CB K9 #5 (W/O) and CB K9 #6 (W/O).
When CCR/GMPR 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/
Gear Motor Protect Relay
(terminals #3 and #5)
white/orange (W/O)