Bunn cdbcf 15 User Guide
Page 12
Location:
The Control Board is located inside the top cover
behind the front face plate.
Test Procedures:
The test procedures for the control board will vary
depending upon the problems experienced by the
brewer. Refer to the Troubleshooting section which
is divided into three sections, Refi ll Circuit, Heating
Circuit, and Brewing Circuit.
brewer. Refer to the Troubleshooting section which
is divided into three sections, Refi ll Circuit, Heating
Circuit, and Brewing Circuit.
Check for Power to board:
1. Insert one meter lead in J1-pin 1 and the other
lead in J1-pin 2.
2. With the power connected to brewer, the voltage
reading to the board should be the line voltage rated
for that model.
If no voltage is present, check wiring to the board.
If voltage is present, and brewer does not power
on, replace board.
1. Insert one meter lead in J1-pin 1 and the other
lead in J1-pin 2.
2. With the power connected to brewer, the voltage
reading to the board should be the line voltage rated
for that model.
If no voltage is present, check wiring to the board.
If voltage is present, and brewer does not power
on, replace board.
Removal and Replacement:
1. Disconnect brewer from power source.
2. Disconnect the wires from the relay on the control
board.
3. Disconnect the 10-pin connector (main harness)
and the 3-pin connector (level probe harness) from
the control board.
4. Disconnect the 10-pin connector (ribbon cable)
from the control board.
1. Disconnect brewer from power source.
2. Disconnect the wires from the relay on the control
board.
3. Disconnect the 10-pin connector (main harness)
and the 3-pin connector (level probe harness) from
the control board.
4. Disconnect the 10-pin connector (ribbon cable)
from the control board.
FIG. 12-1 CONTROL BOARD
5. Remove the two screws and two nylon washers
securing the control board to the front face plate.
6. Tilt the control board inward to clear the display
section.
7. Place the bottom edge of the new control board
in the two cradles, tilt the board forward, and secure
with the two screws and nylon washers to the front
face plate.
NOTE: The nylon washers must be installed under
the heads of the two screws to prevent a possible
shorting of the control board circuits.
8. Re-install wires & connectors.
securing the control board to the front face plate.
6. Tilt the control board inward to clear the display
section.
7. Place the bottom edge of the new control board
in the two cradles, tilt the board forward, and secure
with the two screws and nylon washers to the front
face plate.
NOTE: The nylon washers must be installed under
the heads of the two screws to prevent a possible
shorting of the control board circuits.
8. Re-install wires & connectors.
BEFORE REPLACEMENT:
If a triac or MOV is visibly burned, it was most likely
caused by an external sources such as a shorted wire
or damaged solenoid coil. Use the triac map below to
trace the circuit in question, and repair/replace the
component before replacing control board.
If a triac or MOV is visibly burned, it was most likely
caused by an external sources such as a shorted wire
or damaged solenoid coil. Use the triac map below to
trace the circuit in question, and repair/replace the
component before replacing control board.
FIG. 12-2 TRIACS
CONTROL BOARD
39132 041708
Triac Map:
TH1
TH1
Warmer
TH2/MOV-1 Brew
solenoid
TH3
Warmers
TH4/MOV-2
Refi ll solenoid
TH5
Main warmer
@ J1-7
@ J1-10
@ J1-4&8
@ J1-5
@ J1-6
@ J1-10
@ J1-4&8
@ J1-5
@ J1-6
TH5
TH4
TH3
TH2
TH1
MOV2
MOV1