Troubleshooting guide

Bunn-O-Matic Corporation
15
Connectors and pump speed dials not present on JDF-2 S, CBA (BUNN P/N: 40177.1001)
• J-12
• J-13
• J-15
Pump Speed Dial 3 and 4
Refrigeration Switch (F)
The refrigeration switch is located behind the splash panel next to the circuit board. This switch
passes 120VAC power to the water bath pump and compressor K1 relay contact terminal.
Program Switch (G)
The program switch is located near the main control board next to the refrigeration switch.
Theprogramswitchisusedtoentertimedllmode,brixtestmodesandtoaccessthesemi-
automaticsanitizemodewhilethedispenselockoutswitchisintheONposition.
Step Down Transformer for Lighted Display (H)
This step down transformer is rated for 115 Primary/24 Secondary volts with a 40 VA rating. The
maximum current on the secondary winding is 1.6 Amps. Transformers are power rated in VA
(volts x amps) and applies to both the primary and secondary winding. The secondary voltage
24VACgoestoarectierbeforegoingtoasingleortwoballastslocatedontheinnerdoorpanel.
Rectier (I)
Therectierreceivesthe24VACfromthestepdowntransformerandconvertsthe24VACoverto
24VDC before going on to the door light ballasts rated at 24VDC.
Door Assembly
Thedoorgasketismountedandfoamedinplacetotheinnerdoor.Earlymodelswithuorescentlampsmaycontain
one or two ballasts mounted on the inner door panel or the latest version being LED lighting. See BUNN service
bulletin175aboutconvertinguorescentlightingtoLEDlighting.Theswitchcircuitboard,whichcommunicateswith
the main CBA, is isolated and mounted to the inner door panel. The portion control switch membranes connect to
the switch board in logic order from left to right. The user can initiate a portion dispense of product or has the ability
to set the small, medium and large
buttons as press and hold during
setup. When a membrane switch is
depressed a low input signal is sent to
the switch circuit board. The input is
then communicated to the CBA where
appropriate output voltages are distrib-
uted to the components used during
dispense.
Note: Switch circuit board is not used
or present on juice machine that use
mechanical switch buttons in the outer
door cover.
Dual Ballast Doors
Early Models with Flourescent Bulbs
Door Gasket
Door Latch
LED Lights
Inner
Door
Door Harness
Slot
LED Circuit
Board
Circuit Board
Label Holder
Bezel
P/C Switch
Membrane