Checking The Controller Board - Hoshizaki KM-280MAH-E Service Manual

f) Bin Control
(1) Models with Thermostat
When the ambient temperature is below 7°C, the bin control thermostat
operates to stop the icemaker even if the ice storage bin is empty. When the
thermostat is set in the prohibited range, the icemaker operates continuously
even if the ice storage bin is filled with ice. Setting in the prohibited range
might cause severe damage to the icemaker resulting in failure.
No adjustment is required under normal use, as the bin control is factory-adjusted.
Adjust it, if necessary, so that the icemaker stops automatically within 10 seconds after
ice contacts the bin control thermostat bulb.
(2) Models with Mechanical Bin Control
Dip switch no. 7 must be set to the ON position. If no. 7 is set to the OFF
position, the machine will run continuously, causing a freeze-up condition.
No adjustment is required. The bin control is factory-adjusted.

5. Checking the Controller Board

1) Visually check the sequence with the icemaker operating.
2) Visually check the controller board by using the following procedures:
(i) Adjust the defrost timer to minimum position.
Disconnect the thermistor (K3) from the controller board.
Connect a 1.5 kΩ - 3.5 kΩ resistor to the connector K3 (pins #1 and #2), and energize
the unit.
After the 1 minute ± 5 second water supply cycle and the 2 minute ± 10 second defrost
cycle, the unit should start the freeze cycle.
CAUTION
CAUTION
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