Hoshizaki KM-350MAJ, Service Manual

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Fig. 3
Bin Control Lens
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.
Cycle at Bin
Control Activation Shutdown
Fill Cycle 15 sec. after activation.
Harvest Cycle If engaged 15 sec. or longer, at the end of harvest cycle.
Freeze 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.
Ice Level in Bin Control Board
"BC OPEN/CLOSED" LED Bin Control Controller
Green "LED 1" LED
Empty OFF ON
Full ON OFF
C
ALP
X1
X4
X3
X2
BC OPEN BC CL
OSED
1 2 3 4 5 6 7 8 910
ON
1 2 3 4 5
ON
S4
1
S3
ALARM RESET OUTPUT TEST
K7
K6
K3
K4
K5
K1
K2
S5
POWER OK
LED 2
LED 3
LED 4
LED 1
P/N 2A3792-01
BLA
CK
RED
WHITE
10 9 8 7 6 5 4 3 2 1
S2
1
3
3 2
2
1
3
2
1
3
2
CB
Bin Control
Control Board K4 Bin Control Connector
Bin Empty (closed)
Pin # Wire Color VDC
#1 to #2 R to BK 1VDC
#1 to #3 R to W 5VDC
#2 to #3 BK to W 5VDC
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.