Opti Serve (Os) Sensors - Hoshizaki CUBELET ICEMAKER/DISPENSER DCM-750BAH Service Manual

Problem
[] Abnormal noise.
[3] No water dispensed. a) Power Supply

5. Opti Serve (OS) Sensors

Be sure to check all items in section "IV.C.4. Dipsensing" prior to using this chart. Use
the following charts along with the wiring diagram to troubleshoot the OS sensors.
Problem
[] No ice dispensed.
Possible Cause
a) Gear Motor or Gear
Head
b) Auger Mechanism
c) Dispense Water
Solenoid
b) Water Supply
c) Dispensing Water
Valve
d) Control Board
e) Water Dispense Switch . Opti Serve sensor
Possible Cause
a) OS Sensor
b) Dispense Mode Switch . Wrong setting.
c) Control Board
. Bearing worn out.
. Bad alignment of
auger.
. Foreign matter
interrupting agitator.
. Vibration due to
loosening screws.
. "OFF" position.
. Water supply off or
pressure too low.
. Coil winding open.
. Wiring to dispensing
water valve.
. Defective.
defective. (OS only)
. Bad contacts. (push
button only)
. Dirty sensor.
. Defective.
. Bad contacts.
3. Loose connection.
. Loose connection.
. Defective.
44
Remedy
. Replace.
. Realign.
. Remove foreign matter.
. Apply thread sealant to
the parts and tighten.
. Move to "ON" position.
. Check and get
recommended pressure.
. Replace.
. Check for loose or open
connection. Repair or
replace.
. See "II.D.4. Control
Board Check Procedure."
. See "5. Opti Serve (OS)
Sensors."
. Check for continuity and
replace.
Remedy
. Clean, using Scale Away
(6 fl. oz. (0.8 l) per  gal.
(3.8 l) of water) or other
non-abrasive cleaner.
. See chart 5a and 5b
below.
. Move to desired setting.
. Check for continuity and
replace.
3. Tighten.
. Tighten.
. See "II.D.4. Control
Board Check Procedure"
and chart 5a and 5b
below.