Bunn CDS-3 User Manual

30

FIG. 28 DOOR SWITCH

P1934

Location:

The door switch is located on the right side panel 

under the housing top cover.
Test Procedures:

1.  Disconnect the dispenser from the power source.

2.  Disconnect the twelve pin connector (J1) from the 

control board.

3.  Check continuity between pins 8 & 9 on the wiring 

harness using an ohmmeter. Continuity must be 

present when the door is closed. Continuity must 

not be present when the door is open.

4.  Reconnect the twelve pin connector to the control 

board.

5.  Gain access to the door switch using steps listed 

in Removal and Replacement.

6.  Disconnect the wires from the door switch.

7.  Check continuity between the N.O. and COM. ter-

minals of the switch using an ohmmeter. Continuity 

must  be  present  when  the  actuator  is  engaged. 

Continuity must not be present when the actuator 

is released.

If continuity is present as described, refer to wiring 

diagram and check the dispenser wiring harness.

If  continuity  is  not  present  s  described,  replace  the 

door switch.

Removal and Replacement:

1.  Disconnect the dispenser from the power source.

2.  Remove the hopper assembly from the dispenser.

3.  Remove the dispenser from the CDS machine and 

place it on a flat work surface.

4.  Disconnect the door lamp cord from the lamp con-

nector.

5.  Remove the two #8-32 screws securing the door 

hinge to the dispenser housing.

6.  Carefully pull the door forward until the door support 

arms come completely out of the dispenser housing 

and set aside.

7.  Remove the six #8-32 truss head screws securing 

the rear cover to the dispenser housing.

8.  Remove the six #8-32 round head screws securing 

the front of the housing to the side panels.

9.  Remove the six #8-32 truss head screws securing 

the back of the housing to the side panels.

10. Carefully lift and spread the housing to remove it 

from the rest of the dispenser.

11. Remove  the  door  switch  actuator  from  the  nylon 

standoff.

12. Noting the orientation of the door switch, remove the 

two #6-32 screws and the nylon standoff securing the 

switch mounting bracket to the dispenser housing. 

Remove the switch.

13. Attach the new door switch taking care to orient the 

switch correctly in the mounting bracket and secure in 

place with two #6-32 screws and nylon standoff.

14. Reconnect the wires to the door switch. Refer to Fig. 

29.

15. Install the door switch actuator orienting the notched 

side against the right side housing panel. Refer to 

Fig. 28.

16. Reassemble the dispenser top housing, rear panel, 

and door assembly to the dispenser.

FIG. 29 DOOR SWITCH TERMINALS

P1908

ORA to Control 

Board (J1-9)

GRN to Control 

Board (J1-8)

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