Bunn OT Service Manual download pdf (Page 14)

Page 14

SET LOCK

DIGITAL BREW TIMER (Late Models)

P2201

FIG. 4 DIGITAL BREW TIMER

Location:

The timers are located inside the front of the trunk

on the upper right side of the component brackets.

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 one #8-32 screw 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:

a) 120 volts ac for two wire 120 volt models.

b) 200 or 240 volts ac for two wire 200 or 240

volt models and three wire 120/240 volt models.

c) 100 volts ac for two wire 100 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. Disconnect the white/blue wire from terminal TL3

and the blue/black wire from terminal TL5. With a

voltmeter, check for continuity across the two

wires when the "ON/OFF" switch is in the "ON"

position (upper) and the START switch is pressed.

Connect the brewer to the power source. The

indication must be:

a) 120 volts ac for two wire 120 volt models.

b) 200 or 240 volts ac for two wire 200 or 240

volt models and three wire 120/240 volt models.

c) 100 volts ac for two wire 100 volt models.

If continuity is present as described, reconnect the

wires and proceed to #7.

If continuity is not present as described, refer to the

Wiring Diagrams

and check the brewer wiring har-

ness.

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. The indication must be 0 volts.

If voltage is as described, proceed to #8.

If voltage is not as described, disconnect the brewer

from the power source and replace the timer.

8. 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 as follows:

a) 120 volts ac for two wire 120 volt models.

b) 200 or 240 volts ac for two wire 200 or 240

volt models and three wire 120/240 volt models.

c) 100 volts ac for two wire 100 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 one #8-32 screw securing circuit

board to the mounting bracket.

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

SERVICE (cont.)

10021 071700

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Bunn OT Service Manual Page 14

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