Hoshizaki FD-1001MWH(-C) EN - Manual (Page 66)

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D. Bin Control Check
1. Infrared Sensor Check
IMPORTANT
Make sure S1 dip switch 7 is in the "ON" position. This allows the control board
to monitor the infrared sensor along with the mechanical bin control.
1) Turn off the power supply.
2) Remove the front panel, top panel, and control box cover.
3) Confirm that S1 dip switch 1, 2, & 3 are in the proper position for your application. See
"II.C.4.b) Infrared Sensor Shutdown Delay (S1 dip switch 1, 2, & 3)."
4) Confirm that the infrared sensor is connected to the K6 connector on the control board.
Wipe down the infrared sensor lens with a clean, warm, damp cloth.
5) Move the control switch to the "ICE" position, then move the power switch to the "ON"
position.
6) Turn on the power supply to start the automatic icemaking process. Check that the
infrared sensor green LED is on. This green LED confirms 20VDC power from the
K6 connector on the control board to the infrared sensor and remains on constantly.
Diagnosis: If the green LED is not on, check DC voltage at K6 connector dark blue
(DBU) to brown (BR). If 20VDC is not present the control board is bad and must be
replaced. If 20VDC is present and the green LED is off, the infrared sensor is bad and
must be replaced.
7) Make sure the "GM" LED on the control board is on. There is a delay of at least
30 seconds before the "GM" LED turns on after power-up. After the "GM" LED turns
on, press the "SERVICE" button on the control board to bypass the 5-minute ice purge
cycle. See "II.C.1. Control Board Layout."
WARNING! Risk of electric shock. Care
should be taken not to touch live terminals. The "COMP" LED turns on.
8) "GM" and "COMP" LEDs are on. Use an object to cover the infrared sensor lens at
the bottom of the icemaker. If the bottom of the icemaker is not accessible in your
application, remove the thumbscrew securing the infrared sensor housing, remove
the housing from the base, then cover the infrared sensor lens. See Fig. 7. The yellow
LED on the infrared sensor turns on (flashing or steady). The yellow LED flashes when
ice is at the outer limit of its range and turns steady as ice nears. After the yellow LED
turns on (flashing or steady), the infrared sensor shutdown delay timer starts . See
"Infrared Sensor Shutdown Delay (S1 dip switch 1, 2, and 3)." The compressor should
de-energize immediately after the shutdown delay timer expires. Five minutes later,
the gear motor and fan motor should de-energize.
Diagnosis: If the yellow LED is not
on after covering the lens, the infrared sensor is bad and must be replaced. If the unit
remains on after the infrared sensor shutdown delay timer expires and the 5-minute
ice purge timer expires, the control board is bad and must be replaced. If the infrared
sensor fails to shut down the icemaker and the level of ice activates the mechanical
bin control, the icemaker shuts down within 10 seconds of the mechanical bin control
opening and a 9-beep alarm sounds. To reset, turn the power off, and then on again.