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B. Control Board Check
Before replacing CB 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. Always choose a white neutral wire to establish a good neutral connection
when checking voltages.
Alarm Reset: If CB is in alarm (beeping), press the "ALARM RESET" button on CB while
it is beeping. WARNING!Risk of electric shock. Care should be taken
not to touch live terminals. Once reset, the unit starts at the 1-minute ll
cycle. For audible alarm information, see "II.C.2. LED Lights and Audible
Alarm Safeties."
1) Check the dip switch settings to assure that S4 dip switch 3, 4, 7, 8, 9, 10 and
S5(KM-1601SAH/3 "G"CB) dip switch 1 through 5 are in the factory default position.
S4 dip switch 1, 2, 5, 6 are cleaning adjustments and the settings are exible. For
factory default settings, see "II.C.3.a) Default Dip Switch Settings."
2) Move the control switch to the "ICE" position. If CB red "POWER OK" LED is on, the
control voltage is good. If CB red "POWER OK" LED is off, clear ice away from TBC
bulb in the storage bin area. If no ice is near TBC bulb or CB red "POWER OK" LED
does not turn on even after clearing away ice, check TBC. See "IV.C. Bin Control
Check." If TBC is okay (closed) and CB red "POWER OK" LED is off, check the fuse,
control switch contacts, HPS, and CT secondary circuit. CT output is 10.5V at 115V
primary input. If the secondary circuit has proper voltage and CB red "POWER OK"
LED is off, CB is bad and should be replaced.
If CT secondary circuit does not have proper voltage, check the CT primary circuit.
Check for 115V at CB K1 ten-pin connector. Check the #10 pin (BR wire) to a white
neutral wire for 115V. For additional checks, see "IV.G.1. No Ice Production."
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. For the correct
lighting sequence, see the table below. Note that the order of the LEDs from the outer
edge of CB is 1, 4, 3, 2. Components (e.g., compressor) will cycle during the test.
Model
Control
Board
Correct LED
Lighting Sequence
KM-1601SAH/3 "G" 1, 4, 3, 2
KM-1601SWH/3, KM-1601SRH/3 "E" 2, 3, 4, 1
Following the test, the icemaker resumes operation. If the LEDs do not turn on as
described above, CB is bad and should be replaced.
4) To verify voltage output from CB to the components, slide CB K1 ten-pin connector
out far enough to allow multimeter lead contact. With the unit in the cycle to be tested,
check output voltage from the corresponding pin on CB K1 ten-pin connector to ground.
If output voltage is not present and the appropriate LED is on, CB is bad and must be
replaced.
Legend: CB–control board; CT–control transformer; HPS–high-pressure switch;
TBC–thermostatic bin control