20
c. Gear Motor Protect Relay (GMPR)
CB K9 connector pins #5 (W/O) and #6(W/O): When GMPR is de-energized,
GMPR terminals #3 and #5 are open and 5VDC is present between
CBK9connector pin #5 (W/O) and CB red K4connector pin closest to CBblack
K3 connector. If 5VDC is not present, replace CB. When GMPR is energized, GMPR
terminals #3 and #5are closed and 5VDC is present between CB K9 connector
pin #5 (W/O) and pin #6(W/O) to CB red K4 connector pin closest to CB black
K3connector. If GM is energized and GMPR terminals #3 & #5 are open, an 8-beep
alarm occurs. See "III.B. LED Lights and Audible Alarm Safeties."
• 5VDC CB K8 Connector: See Fig. 2.
5VDC CB K8 Connector
Component Pin # (Wire Color)
Bin Control (BC) #3 (GY) and #4 (GY)
Float Switch (FS) Common #5 (BK) Common
Upper Float Switch (UFS) #6 (R)
Lower Float Switch (LFS) #7 (DBU)
d. Bin Control (BC)
CB K8 connector pins #3 (GY) and #4 (GY): When BC is closed (calling for ice),
5VDC is present between CB K8 connector pin #3 (GY) and pin#4(GY) to CB red
K4 connector pin closest to CB black K3 connector. If5VDC is not present on either
pin, replace CB. If 5VDC is present on pin#3(GY) and not on pin #4 (GY), BC is
open. See "II.D. Bin Control Check."
e. Float Switch (FS): CB K8 connector pins #5 common (BK), #6 UFS (R), and
#7LFS (DBU): 5VDC is present between CB K8 connector pin #5common (BK)
and CB red K4 connector pin closest to CB black K3connector at all times. If 5VDC
is not present, replace CB. For further oat switch diagnostics, see "II.E. Float Switch
Check and Cleaning."
Red positive
test lead to red
K4 connector
pin closest
to black K3
connector
Fig. 2
Red Positive
Test Lead
Black Negative
Test Lead
Multimeter
5VDC
Control Board K8 Connector
Bin Control (GY)
Upper Float Switch (UFS) (R)
Float Switch (FS) Common (BK)
Lower Float Switch (LFS) (DBU)