Hoshizaki MWH KM-515MAH ユーザーズマニュアル

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This appliance uses a lever-actuated proximity switch to control the ice level in the 
storage bin. No adjustment is required. 

To check TBC, follow the steps below.

1) Turn off the power supply.
2) Remove the front panel, then move the control switch to the "OFF" position.
3) Remove the control box cover and base cover, then clear any 

ice away from MBC.

4) Check MBC wire harness connections. See Fig. 1.
5) Disconnect MBC connector from CB K4 connector.
6) Check for continuity across the wires of 

MBC connector. When the actuator paddle 
is not engaged, MBC switch is closed. 
If open, check that the wire harness 
connector is properly connected and that 
the actuator paddle is not sticking. Clean if 
necessary. See "II.D.2.b) Mechanical Bin 
Control Cleaning." If MBC switch still reads 
open, replace MBC. 

7) Press and hold the actuator paddle; check for continuity across the wires of MBC 

connector. When the actuator paddle is engaged, MBC switch is open. If closed, check 
that the actuator paddle is not restricted. Clean if necessary. See "II.D.2.b) Mechanical 
Bin Control Cleaning." If MBC switch still reads closed, replace MBC.

8) Reconnect MBC connector to CB K4 connector, then move the control switch to the 

"ICE" position. Turn on the power supply.

9) Check that CB green "BC CLOSED" LED is on.

10) Allow the icemaker to cycle on. Press and hold the actuator paddle. CB yellow 

"BC OPEN" LED should turn on and the icemaker should shut down according to the 
chart below. If it does not, replace CB.

Fill Cycle

15 sec. after activation.

Harvest Cycle

At the end of the harvest cycle, or up to 15 sec. into the freeze cycle if activated at the 
end of the 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. 

Legend: 

MBC–mechanical bin control; CB–control board 

Actuator 
Paddle

MBC

MBC Connector 
(to control 
board K4 (red) 
connector)

MBC Wire 
Harness (white) 
Connector