[E] Checking Controller Board - Hoshizaki KM-280MAF-E Service Manual

6) Bin Control
When the ambient temperature is below 45°F (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.
[e] 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 K ohm - 3.5 K ohm 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.
(ii) After the above step (i), disconnect the Float Switch leads (K5) from the Controller
Board within the first 5 minutes of the freeze cycle.
The unit should go into the defrost cycle after the first 5 minutes ± 20 seconds of
the freeze cycle.
(iii) During the defrost cycle reconnect the Float Switch Connector to the Controller
Board. After completion of the first 5 minutes of the next freeze cycle, disconnect
the Float Switch leads from the Controller Board.
At this point, the unit should start the defrost cycle.
CAUTION
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