[D] Control Board Check Procedure; [E] Control Board Replacement - Hoshizaki KMD-410MWH Service Manual

[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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