Control Board - Bunn TU3QF-EZ Operating & Service Manual

SERVICE (cont.)

Control Board

FIG. 20 CONTROL BOARD
Location:
The control board is located inside the hood on
the right front behind the start switch.
Test Procedure:
The test procedures for the control board will vary
depending upon the problems experienced by the
brewer. Refer to the Troubleshooting guide beginning
on page 8. The troubleshooting guide is divided into
three sections, Refill Circuit, Heating Circuit, and Brew-
ing Circuit.
Removal and Replacement:
1. Disconnect the black wire (RL2) to the cord set.
2. Disconnect the blue wire (RL1) to the limit ther-
mostat.
3. Disconnect the 8-pin connector (J-1) and the 6-
pin connector (J-5) from the main wiring harness.
4. Disconnect the 2-pin connector (J-7) from the
ready indicator LED.
5. Remove the four #6-32 screws securing the con-
trol board to the component mounting bracket.
6. Remove the four spacers from the old control
board and attach them to the new control board.
7. Install a new control board and secure with the
four #6-32 screws to the component mounting
bracket.
8. Connect the 2-pin connector from the ready indi-
cator LED.
9. Connect the 8-pin connector and the 6-pin con-
nector from the main wiring harness.
10. Connect the blue wire (RL1) from the limit ther-
mostat and the black wire (RL2) from the cord
set.
11. Refer to Adjustments and Optional Settings (Page
7) to program the new control board.
P2159.40
Page 25
FIG. 21 BOARD WIRING
P2151.50
33030 052600