Hoshizaki CUBELET ICEMAKER/DISPENSER DCM-750BAH Service Manual page 45

Problem
[] No water dispensed. a) OS Sensor
5a. Ice Dispensing "Continuous" Mode
Component Control Board
Solenoid K Pin 6 LBU
Sensor K5 Pin 4 W/0
5b. Ice Dispensing "Portion" Mode
Component Control Board
Solenoid K Pin 6 LBU
Sensor K5 Pin  W/R
5c. Water Dispensing
Component Control Board
Solenoid K Pin 8 DBU
Sensor K5 Pin 7 R
Possible Cause
b) Dispense Mode Switch . Wrong setting.
c) Control Board
Sensor
- To
R To
Sensor
- To
R To
Control Board /Other
To K4 Pin  (LBU)
K5 Pin 8 WH
To
K5 Pin 9 BK
. Dirty sensor.
. Defective.
. Bad contacts.
3. Loose connection.
. Loose connection.
. Defective.
Control Board /Other
Neutral/GND
K5 Pin 5 Y
K5 Pin 6 W/BR
Control Board /Other
Neutral/GND
K5 Pin  W/BU
K5 Pin 3 W/BK
On
4VAC
5VDC
5VDC
45
Remedy
. Clean.
. See chart 5c below.
. Move to desired setting.
. Check for continuity and
replace.
3. Tighten.
. Tighten.
. See "II.D.4. Control
Board Check Procedure"
and chart 5c below.
Sensor On
- 0VAC 0VAC
WH 5VDC 0VDC
BK 5VDC 5VDC
Sensor On
- 0VAC 0VAC
WH 5VDC 0VDC
BK 5VDC 5VDC
Off
0VAC
0VDC
5VDC
Off
Off