Hoshizaki KM-350MWJ Service Manual page 23

4) BC controller green "LED 1" LED turns on and CB yellow "BC OPEN/CLOSED" LED is
off.
a) Bin Empty Diagnosis: If fill cycle does not start, confirm BC controller green "LED
1" LED is on. If not, with BC wire harness connected to CB K4 connector, check for
5VDC at CB K4 pin #3 (W) to CB K4 pin #2 (BK). If 5VDC is not present, replace CB.
If 5VDC is present, check that the BC wire harness is connected to the BC controller.
If the BC controller green "LED 1" LED is off, replace BC sensor and BC controller.
If BC controller green "LED 1" LED is on and icemaker does not start, check for
1VDC at CB K4 pin #1 (R) to CB K4 pin #2 (BK). If 1VDC is present, replace CB.
If 4VDC is present, confirm no object is obstructing BC sensor lens. If no obstruction,
replace BC sensor and BC controller.
Control Board K4 Bin Control Connector
Bin Empty (closed)
Pin # Wire Color
#1 to #2
#1 to #3
#2 to #3 BK to W
5) As water begins to fill the water tank (1-min. fill), place an object 5" to 7" (127 to
178 mm) away from the BC sensor lens. See Fig. 3. 15-sec. delay timer starts.
15-sec. delay timer terminates, BC controller green "LED 1" LED turns off and CB "BC
OPEN/CLOSED" LED turns on, and the icemaker shuts down. Remove the object from
the BC sensor lens. 30-sec. delay timer starts. 30-sec. delay timer terminates, CB "BC
OPEN/CLOSED" LED turns off, BC controller green "LED 1" LED turns on, and the
icemaker restarts. Note: In some cases, removing the BC sensor provides better access
when troubleshooting.
Cycle at Bin
Control Activation
Fill Cycle
Harvest Cycle
Freeze Cycle
Ice Level in Bin
Empty
Full
ALARM RESET
VDC
R to BK 1VDC
R to W 5VDC
5VDC
K2
Fig. 3
1 2 3
Shutdown
15 sec. after activation.
If engaged 15 sec. or longer, at the end of harvest cycle.
15 sec. after activation if activated at least 15 sec. before the 5-min. short cycle
protection timer terminates. Otherwise, at the end of the next harvest cycle.
Control Board
"BC OPEN/CLOSED" LED
OFF
ON
OUTPUT TEST
CB
Bin Control
ON
1 2 3 4 5
Bin Control Lens
Bin Control Controller
Green "LED 1" LED
ON
OFF
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