Service Manual
Table Of Contents
- Important Safety Information
- I. Construction and Water/Refrigeration Circuit Diagrams
- II. Sequence of Operation and Service Diagnosis
- III. Controls and Adjustments
- A. Control Board Layout
- B. LED Lights and Audible Alarm Safeties
- C. Controls and Adjustments
- 1. Default Dip Switch Settings
- 2. Infrared Sensor Shutdown Delay (S1 dip switch 1, 2, 3)
- 3. Drain Frequency Control (S1 dip switch 4)
- 4. Continuous Dispensing Timer (S1 dip switch 5 & 6)
- 5. Bin Control Selector (S1 dip switch 7)
- 6. Bin Control Shutdown Delay, Agitation, and Ice Purge Timer (S1 dip switch 8)
- 7. Bin Control Shutdown Delay (S1 dip switch 9)
- 8. Factory Use (S1 Dip Switch 10)
- D. Switches
- IV. Refrigeration Circuit and Component Service Information
- V. Maintenance
- VI. Preparing the Appliance for Periods of Non-Use
- VII. Disposal
- VIII. Technical Information
19
• "DRAIN" Position: When control switch is in the "DRAIN" position, CB K9 pin
#1(W/BK) and pin #2(W/BK) are closed. 0VDC is present between CB K9 pin
#1(W/BK) and CB K9pin #2 (W/BK). If 5VDC is present, check control switch
position and continuity. If open, replace control switch. Next, conrm 5VDC is present
between both CB K9 pin #1(W/BK) and pin #2 to CBK4pin #1 (pin closest to CB
black K3). If5VDC is not present at both locations and control switch continuity is
closed, replace CB.
b) High-Pressure Switch (HPS)
When HPS is closed, 0VDC is present between CB K9 pin #3 (Y) and CB K9 pin #4(Y).
5VDC is present between CB K9 pin #3 and pin #4 to CB K4 pin #1 (pin closest to CB
black K3). Conrm 5VDC from CB K9 pin #3 (Y) to CB K4 pin #1(pin closest to CB
black K3). If5VDC is not present, replace CB. If 5VDC is present at CB K9 pin #3(Y)
and not on CB K9pin #4 (Y), HPS is most likely open. CB sounds a 3-beep alarm.
Check HPS continuity. See "II.B.2.7) HPS Diagnosis." If HPS is open and CB is not in
alarm, replace CB. If 5VDC is present at CB K9 pin #4 (Y) and icemaker doesn't start
and/or CB sounds a 3-beep alarm, replace CB.
c) Compressor Control Relay (CCR)
CB K9 pin #5 (W/O) and pin #6(W/O): When CCR is de-energized (GM off),
CCRterminal #3 and terminal #5 are open and 5VDC is present between CBK9pin #5
(W/O) and CBK9pin #6(W/O). If5VDC is not present, check CCR continuity between
terminal #3 and terminal #5. If closed and CCR is de-energized, replace CCR. If open,
check for 5VDC at CB K9 pin #5 (W/O) to CB K4 pin #1 (pin closest to CB black K3).
If 5VDC is not present, replace CB. When CCR is energized, CCR terminals #3 and
#5close and 0VDC is present between CB K9 pin #5 (W/O) and pin #6(W/O). 5VDC is
present between CB K9 pin #5 (W/O) to CB K4 pin #1 (pin closest to CB black K3) and
CB K9 pin #6 (W/O) to CB K4 pin #1 (pin closest to CB black K3). If GM is energized
and CCR terminals #3& #5 are open, an 8-beep alarm occurs. See "III.B. LED Lights
and Audible Alarm Safeties." If CCR terminals #3 and #5 are closed, Comp delay timer
starts. IfComp does not energize after Comp delay timer terminates, replace CB.
5VDC CB K9 Connector
Component Pin # (Wire Color)
"DRAIN" Position Through Control Switch #1 (W/BK) and #2 (W/BK)
High-Pressure Switch (HPS) #3 (Y) and #4 (Y)
Compressor Control Relay (CCR)
(CCR relay terminals #3 W/O and #5 W/O)
#5 (W/O) and #6 (W/O)
Red test lead to
CB K4 pin #1
(pin closest to CB black K3)
Fig. 1
Control Board K9 Connector
Red Test Lead
Black Test Lead
Multimeter
5VDC
"DRAIN" Position on
Control Switch
(W/BK)
High-Pressure Switch (HPS) (Y)
Compressor Control Relay (CCR)
(CCR relay terminals
#3 W/O and #5 W/O)