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Page 40
SERVICE (cont.)
DIGITAL TIMER (SecondType)
Location:
The timer is located inside the left front of the
brewer on the upper part of the component bracket.
Test Procedures:
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 panel.
2. Check the voltage across terminals TL1 and TL2
with a voltmeter 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, three
wire 120/208 volt models and three wire 120/240
volt models.
b.) 200 to 240 volts ac for two wire 200 or 240 volt
models.
3. Disconnect the brewer from the power source.
If voltage is present as described, proceed to #4.
If voltage is not present as described, refer to the
wiring diagrams and check the brewer wiring harness.
4. Disconnect the WHI/ORA wire from terminal TL3
and the WHI/YEL wire from terminal TL5. Check
for continuity across the two wires when the start
switch is pressed to the "START" position.
If continuity is present as described, reconnect the
wires and proceed to #5.
If continuity is not present as described, refer to the
wiring diagrams and check the brewer wiring harness.
5. Check the voltage across terminals TL1 and TL4
with a voltmeter when the "ON/OFF" switch is in the
"ON" position. Connect the brewer to the power
source. The indication must be zero volts.
If voltage indications are other than described, discon-
nect the brewer from the power source and replace the
timer.
6. Check the voltage across terminals TL1 and TL4
with a voltmeter when the "ON/OFF" switch is in the
"ON" position. Connect the brewer to the power
source and press the start switch. The indication
must be:
a.) 120 volts ac for two wire 120 volt models, three
wire 120/208 volt models and three wire 120/240
volt models.
b.) 200 to 240 volts ac for two wire 200 or 240 volt
models.
If voltage indications are other than described, discon-
nect the brewer from the power source and replace the
timer.
7. Remove the test equipment and connect all wires
as described below.
Removal and Replacement:
NOTE: Do not remove or install wires while timer board
is installed. Pressure applied to one side may cause
damage to the board.
1. Remove the four #6-32 screws securing circuit
board to component mounting bracket.
2. Remove circuit board and nylon spacers.
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 illustration below when recon-
necting the wires.
5. Install new circuit board with nylon spacers to
component mounting bracket using two #6-32
screws.
6. Adjust the timer as described below.
27118 100400
P999
TL5
TL4
TL3
TL2
TL1
J
2
J
1
S
E
T
L
O
C
K
LOCK
SET
BUNN
90 psig max operating pressure
Strainer/Flow Control # 22300.033 0
(Repl. Flow Washer #20526.0330)
(Repl. Screen #23721.0000)
.500 gpm FLOW