Hoshizaki KMD-410MWH, KMD-410MAH d CONTROL BOARD CHECK PROCEDURE, e CONTROL BOARD REPLACEMENT

[d] CONTROL BOARD CHECK PROCEDURE

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.

1)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.

2)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.

3)The output test button provides a relay sequence test. Make sure the control switch is in the "ICE" position, then press the "OUTPUT TEST" button. The correct lighting sequence should be 5, 6, 7, 8, 9, 4. Some components (e.g., the compressor) will cycle during the test. Each LED flashes three times in 5 seconds. LED 5 continues to flash while LED 6 flashes. Following the output test sequence, the icemaker will resume normal operation beginning with the 1 minute fill cycle.

[e] CONTROL BOARD REPLACEMENT

The dip switches should be adjusted to the factory default settings as outlined in this manual. S2 dip switch 5 must remain off.

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