Bunn twf-ez service manual SERVICE cont CONTROL BOARD

SERVICE (cont.)

CONTROL BOARD

TRM2
	J1
J7	J3
	J4
		J2
	J6
	J5
		P1960.50
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 two sections, Heating Circuit and Brewing Circuit.

Removal and Replacement:

1.Disconnect the black wire (COM) to the cordset.

2.Disconnect the blue wire (N.O.) to the limit ther- mostat.

3.Disconnect the 8-pin connector (J-1) and the 6- pin connector (J-5) to the main wiring harness.

4.Disconnect the 2-pin connector (J-7) to the ready indicator LED.

5.Disconnect the 3-pin connector (J-3) to the wir- ing harness.

6.Remove the four #6-32 screws securing the con- trol board to the component mounting bracket.

7.Remove the four spacers from the old control board and attach them to the new control board.

8.Install the new control board and secure with the four #6-32 screws to the component mounting bracket.

9.Connect the 2-pin connector from the ready indi- cator LED.

10.Connect the 8-pin connector and the 6-pin con- nector from the main wiring harness.

11.Connect the blue wire (N.O.) from the limit ther- mostat and the black wire (COM) from the cord set.

12.Connect the 3-pin connector from the main wir- ing harness.

11.Refer to Adjustments and Optional Settings (Page 7) to program the new control board.

P1803.75

FIG. 21 CONTROL BOARD WIRING

Page 25 29466 061599