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Bunn U3A User Manual

Page 28

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Page 28

DIGITAL TIMER (Late Models)

FIG. 29 DIGITAL TIMER

P2212.55

SERVICE (cont.)

Location:

The timer is located on the front center of the

component bracket.

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.
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 "ON/OFF" switch is in
the "ON" position. Connect the brewer to the power
source. The indication must be 230 volts ac .

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 "ON/OFF" switch is in
the "ON" 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 "ON/OFF" switch is in
the "ON" position. Connect the brewer to the power
source and press the "START" switch. The indica-
tion must be 230 volts ac.

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. 30 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 support, funnel and
funnel cover are in place.

NOTE: All volume settings must be done with the
swing spout shield installed.

NEW STYLE

10060.3 070102