Bunn Beverage Dispenser FMD-5 User Manual

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If voltage is present as described, proceed to step 7.

If voltage is not present as described, refer to the wiring 

diagram and check the dispenser wiring harness. 

7.   While pressing the appropriate switch, check for 

continuity across the following pins of the digital 

touch control switch assembly’s multi-pin connec-

tor:

Note: Pin 1 of the connector is identified by an arrow 

embossed on the connector housing.

Left Small : pin 1 to pin 2

Left Medium: pin 2 to pin 3

Left Large: pin 1 to pin 3

Stop: pin 1 to pin 4

Center Small: pin 1 to pin 5

Center Medium: pin 5 to pin 6

Center Large: pin 1 to pin 6

Right Small: pin 1 to pin 7

Right Medium: pin 7 to pin 8

Right Large: pin 1 to pin 8

Hot Water: pin 1 to pin 13

Left Small : pin 1 to pin 2

Left Medium: pin 2 to pin 3

Left Large: pin 1 to pin 3

Stop: pin 1 to pin 4

Right Small: pin 1 to pin 5

Right Medium: pin 5 to pin 6

Right Large: pin 1 to pin 6

Hot Water: pin 1 to pin 7

If continuity is present as described, the membrane 

switch assembly is operating properly.

If continuity is not present as described, replace the 

membrane switch assembly.

P1631

Location:
The digital touch control switch is located on the lower 

outside of the dispenser door.

Test Procedure:

1.   Disconnect the dispenser from the power source.

2.   Open dispenser door and remove the bottom door 

cover.

3.  Disconnect the wires from the door interconnect 

wiring harness to the digital touch control switch 

assembly.

4.   With a voltmeter, and using pin 1 of the multi-pin 

connector of the door interconnect wiring harness  

as a reference (-), check for voltage at each of the 

other pins of the connector. Connect the dispenser 

to the power source. The indication must be +5 

volts dc.

5.  On dispensers with a hot water valve, with a volt-

meter, and using pin 1 of the multi-pin connector 

of the door wiring harness as a reference (-), check 

for voltage at pin 13 (blue/red wire). Connect the 

dispenser to the power source. The indication must 

be approximately 37 volts dc.

6.   Disconnect the dispenser from the power source.

FIG.18 DIGITAL TOUCH CONTROL SWITCH

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