Hoshizaki MODULAR CUBELET SERENITY SERIES FS-1022MLH-C - Manual (Page 33)

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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 backup bin control.
1) Remove the front panel.
2) Move the power switch to the "OFF" position, then unplug the unit from the electrical
outlet.
3) Remove the control box cover and access CB. Confirm that S1 dip switch 1, 2, 3 are in
the proper position for your application. See "II.C.3.b) Infrared Sensor Shutdown Delay
(S1 dip switch 1, 2, 3)."
4) Confirm that IS is connected to the K6 connector on CB. Wipe down the IS lens with
a clean, warm, damp cloth. If the bottom of the icemaker is not accessible in your
application, remove the thumbscrew securing the IS housing, then remove the housing
from the base. See Fig. 3.
5) Make sure the control switch is in the "ICE" position, then plug the icemaker into the
electrical outlet.
6) Move the power switch to the "ON" position to start the automatic icemaking process.
Check that the IS green LED is on. The green LED confirms 20VDC power from CB to
IS and remains on constantly.
Diagnosis: If the green LED is not on, confirm 20VDC at
K6 connector dark blue (DBU) to brown (BR). If 20VDC is present and the green LED is
off, IS is bad and must be replaced. If not, see step "3) IS Power Supply," under "IV.C.
Control Board Check."
7) Make sure the "GM" LED on CB 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 CB to bypass the 5-minute ice purge cycle.
WARNING! Risk of electric
shock. Care should be taken not to touch live terminals.
8) "GM" and "COMP" LEDs are on. Use an object to cover IS lens. The yellow LED on IS
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),
IS shutdown delay timer starts . See "II.C.3.b)Infrared Sensor Shutdown Delay (S1 dip
switch 1, 2, 3)." Comp and FMR should de-energize immediately after the shutdown
delay timer terminates. Five minutes later, GM should de-energize.
Diagnosis: If the
yellow LED is not on after covering the lens, IS is bad and must be replaced. If the unit
remains on after IS shutdown delay timer terminates and the 5-minute ice purge timer
terminates, CB is bad and must be replaced. If IS fails to shut down the icemaker and
the level of ice activates MBC, the icemaker shuts down within 10 seconds of MBC
opening and a 9-beep alarm sounds. To reset, move the power switch to the "OFF"
position, and then back to the "ON" position.