Bunn TWF service manual Digital Brew Timer

SERVICE (cont.)

DIGITAL BREW TIMER (HOT COFFEE -Late Models)

P2198.50

FIG. 8 DIGITAL BREW TIMER

Location:

The timer is located inside the hood on the left side.

Test Procedure.

NOTE: Do not remove or install wires while timer board is installed. Pressure applied to one side may cause damage to the board.

1.Disconnect the brewer from the power source and remove the front access panel.

2.Remove the two #8-32 screws securing circuit board to the mounting bracket.

3.Remove circuit board and spacers (as required).

4.With a voltmeter, check the voltage across termi- nals TL1 and TL2 when the "TEA/OFF/COFFEE" switch is in the "COFFEE" position. Connect the brewer to the power source. The indication must be 120 volts ac for two wire 120 volt models and three wire 120/208 volt models.

5.Disconnect the brewer from the power source.

If voltage is present as described, proceed to #6.

If voltage is not present as described, refer to the Wiring Diagrams and check the brewer wiring har- ness.

6.With a voltmeter, check the voltage across termi- nals TL1 and TL4 when the "TEA/OFF/COFFEE" switch is in the "COFFEE" position. Connect the brewer to the power source. The indication must be 0 volts.

If voltage is as described, proceed to #7.

If voltage is not as described, disconnect the brewer from the power source and replace the timer.

7.With a voltmeter, check the voltage across termi- nals TL1 and TL4 when the "TEA/OFF/COFFEE" switch is in the "COFFEE" position. Connect the brewer to the power source and press the START switch. The indication must be 120 volts ac for two wire 120 volt models and three wire 120/208 volt models.

If voltage is present as described, the brew timer is operating properly. Reset the timer as required, to obtain the desired brew volume.

If voltage is not present as described, disconnect the brewer from the power source and replace the timer.

Removal and Replacement:

1.Remove the two #8-32 screws securing circuit board to the mounting bracket.

2.Remove circuit board and spacers (as required).

3.Remove all wires from the timer.

4.Attach all wires to the replacement timer board prior to installation to the component mounting bracket. Refer to FIG. 9 when reconnecting the wires.

5.Install new circuit board with spacers (as re- quired) to the component mounting bracket.

6.Adjust the timer as described below.

Timer Setting:

NOTE: Prior to setting or modifying volumes, check that the brewer is connected to water supply, the tank is properly filled, and a funnel and server are in place. NOTE: All volume settings must be done with the sprayhead installed.

Page 18 10510 071000