Hoshizaki DCM-271BAH Service Manual page 16

2a) 5VDC CB K9 Connector Continued:
a) Control Switch"DRAIN" Position
CB K9 connector pins #1 (W/BK) and #2 (W/BK):
• "ICE" Position: When the 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, check control switch position and
continuity (open). Replace as needed. Next, confirm 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.
• "DRAIN" Position: When control switch is in the "DRAIN" position, CB K9 connector
pin #1 (W/BK) and pin #2 (W/BK) are closed. 0VDC is present between pin
#1 (W/BK) and pin #2 (W/BK). If not, check control switch position and continuity.
Next, confirm 5VDC is present between both CB K9 connector pin #1 (W/BK) and
pin #2 to CB red K4 connector, pin closest to CB black K3 connector. If 5VDC is not
present on both pins, 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.
c) Compressor Control Relay (CCR)
CB K9 connector pins #5 (W/O) and #6 (W/O): When CCR is de-energized (GM off),
CCR terminals #3 and #5 are open and 5VDC is present between CB K9 connector
pin #5 (W/O) and CB K9 connector pin #6 (W/O). If 5VDC is not present, check CCR
continuity between terminals #3 and #5. If open, replace CB. When CCR is energized,
CCR terminals #3 and #5 close and 0VDC is present between CB K9 connector pin
#5 (W/O) and pin #6 (W/O). 5VDC is present between CB K9 connector pin #5 (W/O)
to CB red K4 connector pin closest to CB black K3 connector and CB K9 connector
pin #6 (W/O) to CB red K4 connector pin closest to CB black K3 connector. If GM is
energized and CCR terminals #3 & #5 are open, an 8-beep alarm occurs. See "III.B.
LED Lights and Audible Alarm Safeties." If CCR terminals #3 and #5 are closed and
0VDC is present between CB K9 connector pin #5 (W/O) and pin #6 (W/O), Comp
delay timer starts. If Comp does not energize after Comp delay timer terminates
(1-min. "F-A" CB E-0 (H) and later and "F-C" CB dip switch 8 off or 5-min. "F-A" CB
E-0 (G) and earlier dip switch 8 on), replace CB.
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