Control Board Check; Bin Control Check And Cleaning - Hoshizaki KM-230BAJ Service Manual

C. Control Board Check
Before replacing a control board that does not show a visible defect and that you
suspect is bad, always conduct the following check procedure. This procedure will help
you verify your diagnosis.
Alarm Reset: If CB is in alarm (beeping), press the "ALARM RESET" button on CB while
CB is beeping. WARNING! Risk of electric shock. Care should be
taken not to touch live terminals. Once reset, the icemaker starts at the
1-minute fill cycle. For audible alarm information, see "III.B. LED Lights
and Audible Alarm Safeties."
1) Remove the louver. Move the control switch to the "OFF" position, then unplug the
appliance. Access the control box.
2) Check the dip switch settings to assure that S1 dip switch 3, 4, 7, 8, 9, & 10 and S2
dip switch 1 through 6 are in the factory default position. S1 dip switch 1, 2, 5, & 6
are cleaning adjustments and the settings are flexible.
3) Plug in the appliance. Move the control switch to the "ICE" position and check for
proper control voltage. If the "POWER OK" LED is on, the control voltage is good.
If the "POWER OK" LED is off, check the control transformer circuit. If no voltage is
present, check the power supply circuit.
4) To perform a relay sequence test, move the control switch to the "ICE" position while
pressing the "OUTPUT TEST" button. WARNING! Risk of electric shock. Care
should be taken not to touch live terminals. The correct lighting sequence should
be 5, 6, 7, 8, 9, 4. Some components (e.g., the compressor) will cycle during test.
Each LED comes on for 5 seconds. LED 5 is on while LED 6 is on. Following the
output test sequence, the icemaker will resume normal operation beginning with the
1 minute fill cycle.
D. Bin Control Check and Cleaning
This machine uses a lever-actuated proximity switch (mechanical bin control) to control
the ice level in the storage bin. No adjustment is required.
The bin control is connected to the K1 connector (pins 4 & 5) on the control board. When
the bin control is calling for ice (proximity switch closed; "POWER OK" LED on), the
control board continues icemaking operations. When the bin control is activated in the
bin full position (proximity switch open; "POWER OK" LED flashing), the control board
drains and shuts down the unit. However, to prevent incomplete batches of ice from
forming on the evaporator, the control board will only shut down the machine during the
freeze cycle before the five minute timer expires. The five minute timer starts counting
down when the thermistor temperature reaches 36°F (2°C). If, during the freeze cycle,
ice pushes in the lever after the five minute timer expires, the control board will allow the
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