Hoshizaki KM-280MAF-E Service Manual page 35

(iv) After Step (iii), de-energize the unit and confirm that the Defrost Timer is in the
minimum position. Disconnect the resistor from the Controller Board, and ener-
gize the unit.
After the 1 minute water supply cycle, the defrost cycle starts.
Re-connect a 1.5 K ohm - 3.5 K ohm resistor to the Connector K3 (pins #1 and
#2) after the first 2 minutes of the defrost cycle.
The unit should start the freeze cycle after 1 minute ± 5 seconds from the resistor
connection.
3) Check the Controller Board by using test program of the Controller Board.
The Output Test Switch "S3" provides a relay sequence test. With power OFF, place
S3 on and switch power to ICE. The correct lighting sequence should be none, 2, 3, 4,
1, and 4, normal sequence every 5 seconds. S3 should remain in the "OFF" position
for normal operation.
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