TB3/TB6 Series
Including: TB3; TB3-LP;
TB3Q; TB3Q-LP; TB6; TB6Q
STARTING WITH SERIAL NUMBER: TU00020000
SERVICE & REPAIR MANUAL
BUNN-O-MATIC CORPORATION
POST OFFICE BOX 3227
SPRINGFIELD, ILLINOIS 62708-3227
PHONE: (217) 529-6601 FAX: (217) 529-6644
41722.0000A 07/09 ©2009 Bunn-O-Matic Corporation
Contents
Trouble Shooting.............................................................................................................. 4
Component Acess ......................................................................................................... 10
Control Thermostat........................................................................................................ 10
Limit Thermostat............................................................................................................ 12
Tank Heater.................................................................................................................... 13
Lighted ON/OFF Switch.................................................................................................. 14
Non Lighted ON/OFF Switch........................................................................................... 15
Start Switches................................................................................................................ 16
Inlet Solenoids............................................................................................................... 17
Dual Timer (TB3/TB6) .................................................................................................... 18
Digital Timer (TB3Q/TB6Q) ............................................................................................ 20
Schematic Wiring Diagrams.......................................................................................... 22
41722 070209
Page 3
TROUBLESHOOTING
A troubleshooting guide is provided to suggest probable causes and remedies for the most likely problems
encountered. If the problem remains after exhausting the troubleshooting steps, contact the Bunn-O-Matic
Technical Service Department.
•
•
•
Inspection, testing, and repair of electrical equipment should be performed only by qualified service person-
nel.
All electronic components have 120 volt ac and low voltage dc potential on their terminals. Shorting of
terminals or the application of external voltages may result in board failure.
Intermittent operation of electronic circuit boards is unlikely. Board failure will normally be permanent. If
an intermittent condition is encountered, the cause will likely be a switch contact or a loose connection at a
terminal or crimp.
•
•
Solenoid removal requires interrupting the water supply to the valve. Damage may result if solenoids are
energized for more than ten minutes without a supply of water.
The use of two wrenches is recommended whenever plumbing fittings are tightened or loosened. This will
help to avoid twists and kinks in the tubing.
•
•
Make certain that all plumbing connections are sealed and electrical connections tight and isolated.
This brewer is heated at all times. Keep away from combustibles.
WARNING – • Exercise extreme caution when servicing electrical equipment.
• Unplug the brewer when servicing, except when electrical tests are specified.
• Follow recommended service procedures
• Replace all protective shields or safety notices
PROBLEM
PROBABLE CAUSE
REMEDY
Brew cycle will not start
1. No water
Water lines and valves to the
brewer must be open.
2. No power or incorrect voltage
to the brewer
(A1) Check the wire crimps for
120 volts across the black and
white terminals on two wire 120
volt brewers.
(A2) Check the wire crimps for
200 volts on "B Series" brewers
or 230 volts on "A Series" brew-
ers across the red and black
terminals.
(B) Check circuit breakers or
fuses.
41722 070209
Page 4
TROUBLESHOOTING (cont.)
PROBLEM
PROBABLE CAUSE
REMEDY
Brew cycle will not start (cont.)
3. ON/OFF Switch
Refer to Service - ON/OFF
Switch for testing.
4. Start Switch
5. Timer
Refer to Service - Start Switch
for testing procedures.
Refer to Service - Timer for test-
ing procedures.
6. Solenoid Valve
Refer to Service - Solenoid Valve
for testing procedures.
7. Water strainer/flow control
(If equipped)
(A) Direction of flow arrow must
be pointing towards brewer.
(B) Remove the strainer/flow
control and check for obstruc-
tions. Clear or replace.
Water is not hot
1. (A) Limit Thermostat
Refer to Service - Limit Ther-
mostat for testing procedures.
Thermal Cut-Off for testing
procedures.
(B) Thermal Cut-Off (230V)
CAUTION - Do not eliminate
or bypass limit thermostat or
thermal cut-off. Use only BOM
replacement parts.
2. Control Thermostat
3. Tank Heater
Refer to Service - Control Ther-
mostat for testing procedures.
Refer to Service - Tank Heater
for testing procedures.
41722 070209
Page 5
TROUBLESHOOTING (cont.)
PROBLEM
REMEDY
PROBABLE CAUSE
1. Strainer /flow control
(If equipped)
(A) Direction of flow arrow must
be pointing towards the brewer.
Inconsistent beverage level in
dispenser
(B) Remove the strainer/flow
control and check for obstruc-
tion. Clear or replace.
2. Syphon System
The brewer must be level or
slightly lower in front to syphon
properly.
3. Lime Build-up
Inspect the tank assembly for
excessive lime deposits. Delime
as required.
CAUTION - Tank and tank com-
ponents should be delimed
regularly depending on local
water conditions. Excessive min-
eral build-up on stainless steel
surfaces can initiate corrosive
reactions resulting in serious
leaks.
4. Water Pressure
The water pressure to the brewer
must be at least 20 psi (138kPa)
and minimum 1.0 gpm flow rate.
1. Timer
Timer dial must indicate at least
two minutes and fifteen seconds.
Refer to Operating Manual.
Consistently low beverage level
in the dispenser
2. Strainer/flow Control
(If equipped)
(A) Direction of flow arrow must
be pointing towards brewer.
(B) Remove the strainer/flow
control and check for obstruc-
tions. Clear or replace.
1. Lime Build-up
Spitting or excessive steaming
CAUTION - Tank and tank com-
ponents should be delimed
regularly depending on local
water conditions. Excessive min-
eral build-up on stainless steel
surfaces can initiate corrosive
reactions resulting in serious
leaks.
Inspect tank assembly for exces-
sive lime deposits. Delime as
required.
41722 070209
Page 6
TROUBLESHOOTING (cont.)
PROBLEM
PROBABLE CAUSE
REMEDY
Spitting or excessive steaming
(cont.)
2. Control Thermostat
Refer to Service - Control Ther-
mostat for testing procedures.
Dripping from sprayhead
1. Syphon System
The brewer must be level or
slightly lower in front to syphon
properly.
2. Lime Build-up
Inspect the tank assembly for
excessive lime deposits. Delime
as required.
CAUTION - Tank and tank com-
ponents should be delimed
regularly depending on local
water conditions. Excessive min-
eral build-up on stainless steel
surfaces can initiate corrosive
reactions resulting in serious
leaks.
3. Solenoid Valve
Remove the solenoid valve and
clear any obstructions. Rebuild
or replace the valve if necessary.
Water flows into tank continu-
ously (ON/OFF Switch "ON")
1. Timer
Refer to Service - Timer for test-
ing procedures.
Water flows into tank continu-
ously (ON/OFF Switch "OFF")
1. Solenoid Valve
Remove the Solenoid Valve and
clean any obstruction. Rebuild
or replace the valve if necessary.
Beverage overflows dispenser
1.Dispenser
2. Timer
The dispenser must be com-
pletely empty before starting a
brew cycle.
Refer to Service - Timer for test-
ing procedures.
3. Solenoid Valve
Page 7
Remove the Solenoid Valve and
clean any obstruction. Rebuild
or replace the valve if necessary.
41722 070209
TROUBLESHOOTING (cont.)
PROBLEM
PROBABLE CAUSE
REMEDY
1. Filter Type
Weak beverage
BUNN® paperfiltersmustbeused
for proper extraction.
2. Coffee Grind
3. Sprayhead
A fine or drip grind must be used
for proper extraction.
A six-hole stainless steel spray-
head must be used for proper
extraction.
4. Funnel Loading
The BUNN® paper filter must be
centered in the funnel and the
bed of ground leveled by gentle
shaking.
5. Water Temperature
Placeanemptyfunnelonanempty
dispenser beneath the sprayhead.
Initiate a brew cycle and check the
water temperature immediately
below the sprayhead with a ther-
mometer. The reading should not
be less than 200°F (93°C). Adjust
the control thermostat to increase
the water temperature. Replace if
necessary.
1. Funnel Loading
1. Solenoid
Dry coffee grounds remain in the
funnel
The BUNN® paper filter must be
centered in the funnel and the
bed of grounds leveled by gently
shaking.
Brewer is making unusal noises
The nut on the solenoid must
be tight or it will vibrate during
operation.
2. Plumbing Lines
3. Water Supply
Plumbing lines should not resting
on the counter top.
(A)Thebrewermustbeconnected
to a cold water line.
(B) Water pressure to the brewer
must not exceed 90 psi (620 kPa).
Install a regulator if necessary to
lower the working pressure to ap-
proximately 50 psi (345 kPa).
41722 070209
Page 8
TROUBLESHOOTING (cont.)
PROBLEM
PROBABLE CAUSE
REMEDY
4. Tank Heater
Remove and clean lime off the
tank heater.
Brewer is making unusal noises
(cont.)
41722 070209
Page 9
SERVICE
This section provides procedures for testing and
CONTROL THERMOSTAT
replacing various major components used in this
brewer should service become necessary. Refer to
Troubleshooting for assistance in determining the
cause of any problem.
WARNING - Inspection, testing, and repair of electri-
cal equipment should be performed only by qualified
service personnel. The brewer should be unplugged
when servicing, except when electrical tests are re-
quired and the test procedure specifically states to
plug-in the brewer.
COMPONENT ACCESS
WARNING - Disconnect the brewer from the power
source before the removal of any panel or the replace-
ment of any component.
FIG. 10-2 CONTROL THERMOSTAT
Location:
The control thermostat is located in the hood.
All components are accessible by the removal of
the top cover, front inspection panel, and rear panel.
Test Procedures:
1. Disconnect the brewer from the power source.
2. Locate the blue wire on the control thermostat.
3. Check the voltage across the blue/black wire on
the control thermostat and the white wire on the
tank heater on 120V models or red wire on the
tank heater on two wire 200V or 230V models
with a voltmeter. Connect the brewer to the power
source. The indication must be:
a) 120 volts ac for two wire 120 volt models.
b) 200 to 230 volts ac for two wire 200 or 230
volt models.
4. Disconnect the brewer from the power source.
If voltage is present as described, proceed to #5.
Ifvoltageisnotpresentasdescribed,refertothewiring
diagrams and check the brewer wiring harness.
5. Locate the black wire on the control thermostat.
6. Gently remove the capillary bulb and grommet
from the tank.
7. Check the voltage across the black wire of the
control thermostat and the white wire on the tank
heater on 120V models or red wire on the tank
heater on two wire 200V or 230V models with a
voltmeter when the control thermostat is turned
fully clockwise. Connect the brewer to the power
FIG. 10-1 COMPONENT ACCESS
(CONTINUED)
41722 070209
Page 10
SERVICE (cont.)
CONTROL THERMOSTAT (cont.)
source. The indication must be:
a) 120 volts ac for two wire 120 volt models.
b) 200 to 230 volts ac for two wire 200 volt or 230
volt models.
8. Disconnect the brewer from the power source.
Ifvoltageispresentasdescribed,reinstallthecapillary
tube into the tank to the line 4.5" above the bulb, the
control thermostat is operating properly.
If voltage is not present as described, replace the
thermostat.
Removal and Replacement:
1. Disconnect the control thermostat wires.
2. Remove the thermostat capillary bulb by firmly
pulling-up on the capillary at the tank lid. This will
disengage the grommet from the tank lid.
3. Remove the one #6-32 screw securing the control
thermostat to the component bracket inside the
hood.
FIG. 11-1 CONTROL THERMOSTAT TERMINALS
4. Slide the grommet to the line 4.5" above the bulb
on the new capillary tube.
5. Insert the capillary bulb through the hole in the
tank lid and press the grommet firmly and evenly
so that the groove in the grommet fits into the tank
lid.
6. Carefully bend the capillary tube so that the tube
and bulb inside the tank are in the vertical posi-
tion.
NOTE - The capillary tube must be clear of any electri-
cal termination and not kinked.
7. Usingone#6-32screw,securethecontrolthermo-
stat to the component bracket inside the hood.
8. Adjust the control thermostat as required.
FIG. 11-2 REPLACEMENT CONTROL THERMOSTAT
41722 070209
Page 11
SERVICE (cont.)
LIMIT THERMOSTAT
Ifcontinuityispresentasdescribed,thelimitthermostat
is operating properly.
If continuity is not present as described, replace the
limit thermostat.
Removal and Replacement:
1. Remove all wires from limit thermostat termi-
nals.
2. Carefully slide the limit thermostat out from under
the retaining clip and remove limit thermostat.
3. Carefully slide the new limit thermostat into the
retaining clip.
4. Refer to the schematics when reconnecting the
wires.
Lead from
Control Thermostat
to Tank
Heater Switch
FIG. 12-1 LIMIT THERMOSTAT
Location:
The limit thermostat is located inside the rear of
the hood on the tank lid.
Test Procedures:
1. Disconnect the brewer from the power source.
2. Disconnect the blue and black wires from the limit
thermostat.
FIG. 12-2 LIMIT THERMOSTAT TERMINALS
3. Check for continuity across the limit thermostat
terminals with a ohmmeter.
41722 070209
Page 12
SERVICE (cont.)
TANK HEATER
HEATER
1680W-120V
1680W-100V
1680W-230V
RESISTANCE
7.9 - 9.2
5.5 -6.4
29.0 -33.7
TERMINAL TO SHEATH - INFINITE (OPEN)
If resistance is not present as described, replace the
tank heater.
NOTE- If any resistance is read between sheath and
either terminal, remove and inspect heater for
cracks in the sheath.
Removal and Replacement:
1. Disconnect the brewer from the power supply.
2. Disconnect the water supply from the brewer.
3. Disconnect the wires from the limit thermostat.
4. Disconnect the wires from the tank heater termi-
nals.
5. Remove sprayhead and the hex nut securing the
sprayhead tube to the hood. Set aside for reas-
sembly.
FIG. 13-1 TANK HEATER
Location:
The tank heater is located inside the tank and
secured to the tank lid.
6. Remove the six #10 screws securing the tank lid
to the tank.
7. Remove the tank lid with limit thermostat, spray-
head tube and tank heater.
8 Remove the two hex nuts securing the tank heater
to the tank lid. Remove tank heater with gaskets
and discard.
9. Install new tank heater with gaskets on the tank
lid and secure with two hex nuts.
10. Install tank lid with limit thermostat, sprayhead
tube and tank heater using six #10 screws.
11. Secure sprayhead tube to hood using hex nut
removed in step 4.
Test Procedures:
1. Disconnect the brewer from the power supply.
2. Turn on thermostat. Check the voltage across the
black and white wires on 120 volt models or the
black and red wires for 200 volt models and 230
volt models with a voltmeter. Connect the brewer
to the power source. The indication must be:
a) 120 volts ac for two wire 120 volt 20 amp
models .
b) 200 to 230 volts ac for two wire 200 or 230 volt
models.
3. Disconnect the brewer from the power source.
12. Install sprayhead.
15. Reconnect the wires to the limit thermostat and
tank heater.
If voltage is present as described, proceed to #4
If voltage is not present as described, refer to the Wir-
ing Diagrams and check wiring harness.
16. Reconnect the water and power supply.
4. Disconnect the wires from the tank heater termi-
nals.
5. Checkresistancevalueacrosstankheaterterminals
and compare to chart.
If resistance is present as described, reconnect the
wires, the tank heater is ok.
41722 070209
Page 13
SERVICE (cont.)
LIGHTED ON/OFF SWITCH (TB3/TB3Q)
Removal and Replacement:
1. Remove the wires from the switch terminals.
2. Compress the clips inside the hood and gently
push the switch through the opening.
3. Push the new switch into the opening and spread
the clips to hold the switch captive in the hood.
4. Refer to FIG. 14-2 when reconnecting the wires.
P/N 37080.0000
Orange light
FIG. 14-1 LIGHTED ON/OFF SWITCH
Location:
The ON/OFF switch is located in the front of the
hood, above and to the left of the brew funnel.
Test Procedure:
Brewers W/Out Half Batch or Sweetener Options
1. Disconnect the brewer from the power source.
2. Remove the wires from all four terminals.
3. Check for continuity across the two terminals on
the lower right of the switch (as shown). Continuity
must be present across these terminals in the ON
position.
BLACK
WHITE
If continuity is present as described, reconnect the
wires, the switch is operating properly. If continuity
is not present as described, replace the switch.
WHT/VIO
P/N 37080.0000
2 WHT/VIO
NOTE: No continuity will show across the upper
left terminals of the lighted switch since the light is
neon.
FIG. 14-2 LIGHTED ON/OFF SWITCH TERMINALS
41722 070209
Page 14
SERVICE (cont.)
ON/OFF SWITCH-TB6/Q (Sweetner ½ Batch Option-TB3/Q)
WHI/VIO
BLACK
PINK
optional
½ batch
P/N 03356.0003
Non Lighted
GRAY
Optional
½ batch
FIG. 15-1 NON LIGHTED ON/OFF SWITCH
FULL/OFF/HALF-TB3/TB3Q
WHI/VIO
Location:
The switch is located on the front control panel.
WHITE
Test Procedure:
1. Disconnect the brewer from the power source.
2. Disconnect the wires from switch terminals.
3. Check for continuity across the center and right
and across center and left terminals in rows one
through four when the switch is in the oposite
position.
BRN/WHI
WHI/GRN
BLACK
If continuity is not present as described, replace the
switch.
If continuity is present as described, replace the wires
the switch is operating properly.
WHI/VIO
UNSWEET/OFF/SWEET-TB3/TB3Q
w/SWEETENER & EMPTY DETECT
Removal and Replacement:
WHI/VIO
1. Remove the wires from the switch terminals.
2. Remove the clips on the switch bezel inside the
hood and gently push the switch through the
opening.
YELLOW
3. Push the new switch into the opening from inside
the hood and secure into place by pressing the
bezel through the front of the hood. Make sure
the clips on the switch bezel are locked around
the switch housing and spread the clips to hold
the switch captive in the hood.
BLACK
BRN/BLK
LEFT/OFF/RIGHT-TB6
4. Refer to FIG. 15-2 when reconnecting the wires.
FIG. 15-2 ON/OFF SWITCH TERMINALS
41722 070209
Page 15
SERVICE (cont.)
START SWITCHES
WHI/YEL
to Timer T5
WHI/ORN
to Timer T3
P/N 37079.0000
Non Lighted
P/N 37080.0001
Green ready light
FIG. 16-1 START SWITCHES
P/N 37079.0000
Location:
The start switch is located in the front of the hood,
above and to the right of the brew funnel.
WHI/YEL
to Timer T5
Test Procedure:
1. Disconnect the brewer from the power source.
2. Remove the wires from all four terminals.
3. Check for continuity across the two terminals on
the right side of the switch when it is held in the
lower position. Continuity must not be present
across these terminals in the upper position.
4. Check for continuity across the two terminals on
the left side of the switch when it is held in the
lower position. Continuity must not be present
across these terminals in the upper position.
If continuity is not present as described, replace the
switch.
GREEN
WHI/ORN
to Timer T3
RED
P/N 37079.0000
If continuity is present as described, reconnect the
wires, the switch is operating properly.
If continuity is not present as described, replace the
switch.
WHI/YEL
to Timer T5
NOTE: No continuity will show across the left terminals
of the lighted switch since the light is neon.
BLK
to T. Stat
Removal and Replacement:
WHI/ORN
to Timer T3
1. Remove the wires from the switch terminals.
2. Compress the clips inside the hood and gently
push the switch through the opening.
3. Push the new switch into the opening and spread
the clips to hold the switch captive in the hood.
4. Refer to Fig. 16-2 when reconnecting the wires.
BLU/BLK
to T. Stat
P/N 37080.0001
FIG. 16-2 START SWITCH TERMINALS
41722 070209
Page 16
SERVICE (cont.)
INLET VALVES
three wire 120/240 volt models.
b) 200 to 230 volts ac for two wire 200 or 230 volt
models.
7. Disconnect the brewer from the power source,
If voltage is present as described, proceed to #8
If voltage is not present as described, refer to Wiring
Diagrams and check brewer wiring harness.
8. Check for continuity across the solenoid termi-
nals.
If continuity is present as described, reconnect the
white and black wire from the timer.
If continuity is not present as described, replace the
solenoid valve.
FIG. 17-1 INLET VALVES
Location:
The solenoid valve(s) are located inside the trunk
onthelowercenterpartofthecomponentbracket. So-
lenoids in the early models are located in the hood.
Removal and Replacement:
1. Disconnect the brewer from the power source.
2. Turn off the water supply to the brewer.
3. Remove the wires from the solenoid.
4. Disconnectthewaterlinestoandfromthesolenoid
valve.
5. Remove the two screws securing the solenoid
mounting bracket to the component bracket.
6. Install new solenoid valve to the component
bracket.
Test Procedures:
1. Check the solenoid valve for coil action. With "ON/
OFF" switch in the "ON' upper position press start
switch and listen carefully in the vicinity of the
solenoid valve for a" clicking" sound as the coil
magnet attracts.
7. Securely fasten the water lines to and from the
solenoid valve.
2. Disconnect the brewer from the power source.
8. Refer to schematics when reconnecting the
wires.
If the sound is heard as described and water will not
pass through the solenoid valve, there may be a block-
age in the water line before the solenoid valve or, the
solenoid valve may require inspection for wear, and
removal of waterborne particles.
If the sound is not heard as described, proceed to
#3.
3. Disconnect the brewer from the power source.
4. Connect a voltmeter across the solenoid terminals
(leave wires connected).
5. Connect the brewer to the power source. With the
"ON/OFF" switch in the "ON" upper position press
the start switch.
6. Check the voltage across the solenoid. The indica-
tion must be:
a) 120 volts ac for two wire 120 volt models and
41722 070209
Page 17
SERVICE (cont.)
BREW/DILUTION TIMER (TB3 & TB6)
If voltage is present as described, the timer is operat-
ing properly.
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 #6-32 screws, lock washers and
spacers securing timer to bracket.
2. Disconnect all wires from the timer.
3. Refer to schematic and reconnect wires.
4. Install new timer to bracket with the two #6-32
screws, lock washers and spacers.
5. Adjust the timer as required.
FIG. 18-1 BREW/DILUTION TIMER
Location:
The timer is located in left side of the hood.
SW1
Test Procedure:
NOTE:Donotremoveorinstallwireswhiletimerboard
is installed. Pressure applied to one side may cause
damage to the board.
1. Disconnect the brewer from the power source and
remove the top cover.
2. With a voltmeter, check the supply voltage across
terminals TL1 and TL2. Connect the brewer to the
power source. Turn on the "ON/OFF" switch. The
voltage must be:
J-1
TRM-1
TRM-2
TRM-3
TRM-4
TRM-5
TRM-6
a) 120 volts ac for two wire 120 volt models.
b) 200 to 230 volts ac on two wire 200 volt or
230 volt models.
3. Disconnect the brewer from the power source.
J-4
FIG. 18-2 TIMER TERMINALS
If voltage is present as described, proceed to #4.
If voltage is not present as described, refer to the Wir-
ing Diagrams and check the wiring harness.
Terminals:
J-1
J-4
½ batch connector
Dilution delay time 1-2 (NORMAL), 3-4 (2x)
4. With a voltmeter, check the BREW output voltage
across terminals TL2 and TL4; and the DILUTION
output voltage across terminals TL2 and TL6.
Connect the brewer to the power source, turn on
the"ON/OFF"switchandpressthe"START"switch.
The voltage must be:
SW-1 Programming Enable/Disable
TRM-1 White/Violet L1 in from ON/OFF switch
TRM-2 White (Red) Neutral (L2)
TRM-3 White/Orange Start switch
TRM-4 White/Green Brew solenoid
TRM-5 White/Yellow Start switch
a) 120 volts ac for two wire 120 volt models.
b) 200 to 230 volts ac for two wire 200 volt or 230
volt models.
TRM-6 White/Blue
Dilution solenoids
41722 070209
Page 18
SERVICE (cont.)
BREW/DILUTION TIMER (TB3 & TB6) (cont.)
FIG. 19-1 BREW/DILUTION TIMER TRIACS
Triacs:
TH-1/MV-1
TH-2/MV-2
Brew solenoid
Dilution solenoid
41722 070209
Page 19
SERVICE (cont.)
DIGITAL BREW TIMER (TB3Q & TB6Q)
to the power source, turn on the "ON/OFF" switch
and press the "START" switch. The indication must
be as follows:
a) 120 volts ac for two wire 120 volt models.
b) 200 to 230 volts ac on two wire 200 volt or
230 volt models.
If voltage is not present as described, refer to the
Wiring Diagrams and check the wiring harness to the
start switch.
If start voltage is present as described (but no output
voltage), replace the timer.
Removal and Replacement:
FIG. 20-1 DIGITAL TIMER
1. Remove the two #6-32 screws, lock washers and
spacers securing timer to bracket.
2. Disconnect all wires from the timer.
3. Refer to schematic and reconnect wires.
4. Install new timer to bracket with the two #6-32
screws, lock washers and spacers.
Location:
The timer is located in left side of the hood.
Test Procedure
NOTE:Donotremoveorinstallwireswhiletimerboard
is installed. Pressure applied to one side may cause
damage to the board.
5. Adjust the timer as required.
1. Disconnect the brewer from the power source and
remove the top cover.
2. With a voltmeter, check the supply voltage across
terminals TL1 and TL2. Connect the brewer to the
power source. Turn on the "ON/OFF" switch. The
voltage must be:
TRM-1
TRM-2
a) 120 volts ac for two wire 120 volt models.
b) 200 to 230 volts ac on two wire 200 volt or
230 volt models.
SW1
TRM-3
3. Disconnect the brewer from the power source.
J-2
TRM-4
If voltage is present as described, proceed to #4.
If voltage is not present as described, refer to the Wir-
ing Diagrams and check the wiring harness.
J-1
TRM-5
4. With a voltmeter, check the output voltage across
terminals TL1 and TL4. Connect the brewer to the
power source, turn on the "ON/OFF" switch and
press the "START" switch. The voltage must be:
a) 120 volts ac for two wire 120 volt models.
b) 200 to 230 volts ac for two wire 200 volt or 230
volt models.
If voltage is present as described, the timer is operat-
ing properly. If voltage is not present as described,
proceed to #5.
FIG. 20-2 DIGITAL TIMER
Terminals:
J-2
J-1
½ batch connector
Multi batch (NOT USED IN TB SERIES)
SW-1 Programming Enable/Disable
TRM-1 White/Violet L1 from ON/OFF switch
TRM-2 White (Red) Neutral (L2)
TRM-3 White/Orange Start switch
TRM-4 White/Green Brew solenoid
TRM-5 White/Yellow Start switch
5. With a voltmeter, check the input start voltage
acrossterminalsTL2andTL5. Connectthebrewer
41722 070209
Page 20
SERVICE (cont.)
DIGITAL BREW TIMER (TB3Q & TB6Q) (cont.)
FIG. 21-1 DIGITAL TIMER TRIACS
Triacs:
Q-1/MV-2
MV-1
Brew solenoid output
Line in
41722 070209
Page 21
SCHEMATIC WIRING DIAGRAM TB3Q
(OPTIONAL)
READY INDICATOR
GREEN
BLU/BLK
BLK
N
L1
LIMIT
SW. & THERMOSTAT
THERMOSTAT
TANK HEATER
WHI
BLK
BLK
BLU/BLK
WHI
BLK
WHI
WHI
WHI
"KEEP WARM HEATER"
SOL
SW1
WHI/VIO
SW2
WHI/VIO
WHI
WHI/ORA
WHI/GRN
WHI/YEL
1
2
3
4
5
BREW
TIMER
120 VOLTS AC
2 WIRE
SINGLE PHASE
37234.0001A 08/04 © 2004 BUNN-O-MATIC CORPORATION
SCHEMATIC WIRING DIAGRAM
TB3QA
GRN/YEL
L1
L2
SW. &
THERMOSTAT
LIMIT
THERMAL
FUSE
BLK
THERMAL
FUSE
THERMOSTAT
BLK
WHI
BLU/BLK
RED
TANK HEATER
WHI
RED
SW1
"KEEP WARM" HEATER
WHI/VIO
RED
WHI/ORN
WHI/GRN
WHI/YEL
BLK
WHI/VIO
WHI/GRN
BREW
TIMER
SOL
SW2
230 VOLTS AC
2 WIRE
SINGLE PHASE
37234.0003A 11/04 © 2004 BUNN-O-MATIC CORPORATION
41722 070209
Page 22
SCHEMATIC WIRING DIAGRAM TB3, TB3B, TB3-LP
L1
N
Earth Ground
GRN
SWITCH &
THERMOSTAT
LIMIT
THERMOSTAT
Chassis Ground
BLK
WHI
BLU/BLK
BLK
WHI
TANK HEATER
WHI
WHI
"KEEP WARM" HEATER
ON/OFF SWITCH
BLK
BREW/DILUTION
TIMER
6 5 4 3 2 1
WHI
WHI/VIO
WHI/VIO
OPTIONAL
READY
INDICATOR
DILUTION
WHI/BLU
WHI/GRN
SOL
BLU/BLK
BLK
BREW
START
SWITCH
WHI/VIO
SOL
WHI/ORN
WHI/YEL
100 VOLTS AC
120 VOLTS AC
2 WIRE + GND
SINGLE PHASE
37234.0007A 02/08 © 2008 BUNN-O-MATIC CORPORATION
41722 070209
Page 23
SCHEMATIC WIRING DIAGRAM
TB3B W/HALF-BATCH
L1
N
Earth Ground
GRN
SWITCH &
THERMOSTAT
LIMIT
THERMOSTAT
Chassis Ground
BLK
WHI
BLU/BLK
BLK
WHI
WHI
TANK HEATER
"KEEP WARM" HEATER
HALF/OFF/FULL SWITCH
BLK
SW1A
SW1B
SW1C
SW1D
½ BATCH
WHI/VIO
J1
1
BREW/DILUTION
TIMER
PNK
GRY
3
6 5 4 3 2 1
WHI
WHI/VIO
WHI/VIO
OPTIONAL
READY
INDICATOR
DILUTION
WHI/BLU
WHI/GRN
SOL
BREW
BLU/BLK
BLK
WHI/VIO
SOL
START
SWITCH
WHI/ORN
WHI/YEL
100 VOLTS AC
120 VOLTS AC
2 WIRE + GND
SINGLE PHASE
37234.0008B 10/08 © 2008 BUNN-O-MATIC CORPORATION
SCHEMATIC WIRING DIAGRAM TB3Q
POWER CORD
GRN
N
L1
Earth Ground
Chassis Ground
SWITCH &
THERMOSTAT
LIMIT
THERMOSTAT
BLU
BLK
WHI
BLU/BLK
BLK
TANK HEATER
WHI
BLK
WHI
WHI
WHI
SW1
"KEEP WARM HEATER"
WHI/VIO
OPTIONAL
READY
SOL
INDICATOR
WHI/VIO
WHI
WHI/ORA
WHI/GRN
WHI/YEL
1
2
3
4
5
BREW
TIMER
START SWITCH
120 VOLTS AC
2 WIRE
SINGLE PHASE
37234.0009B 06/08 © 2008 BUNN-O-MATIC CORPORATION
41722 070209
Page 24
SCHEMATIC WIRING DIAGRAM TB3Q
W/SWEETENER & EMPTY BAG DETECT
L1
GREEN
N
LIMIT
THERMOSTAT
THERMOSTAT
TANK HEATER
BLK
WHI
BLU/BLK
BLK
WHI
WHI
"KEEP WARM" HEATER
LOW PRESSURE
SWITCH
COM.
N.O.
WHI/VIO
BLU
WHI
WHI
RELAY
2
UNSWEET/OFF/SWEET
WHI/VIO
BLK
WHI
SOLD OUT INDICATOR
7
WHI/VIO
5
BLK
START
WHI/VIO
WHI/BLK
WHI/ORA
WHI/GRN
WHI/YEL
1
2
3
4
5
BREW
TIMER
WHI/VIO
BRN/WHI
SOL
SOL
SOL
SWTNR
WHI/BLU
120 VOLTS AC
2 WIRE
SINGLE PHASE
37234.0010A 04/08 © 2008 BUNN-O-MATIC CORPORATION
SCHEMATIC WIRING DIAGRAM TB3A
Earth Ground
OPTIONAL
READY
INDICATOR
GRN
BLU
BLK
L1
N
SWITCH &
THERMOSTAT
THERMAL
FUSE
BLK
THERMAL
FUSE
LIMIT
THERMOSTAT
Chassis Ground
TANK HEATER
BLK
WHI
BLU/BLK
RED
WHI
RED
"KEEP WARM" HEATER
ON/OFF SWITCH
BLK
BREW/DILUTION
TIMER
6 5 4 3 2 1
WHI/VIO
WHI/VIO
WHI/VIO
DILUTION
RED
RED
WHI/BLU
SOL
2
START
SWITCH
WHI/ORN
WHI/YEL
WHI/GRN
SOL
1
BREW
230 VOLTS AC
2 WIRE
SINGLE PHASE
37234.0011A 10/08 © 2008 BUNN-O-MATIC CORPORATION
41722 070209
Page 25
SCHEMATIC WIRING DIAGRAM TB6
GRN
OPTIONAL
READY INDICATOR
Chassis Ground
Earth Ground
N
BLU
BLK
L1
SW. &
THERMOSTAT
LIMIT
THERMOSTAT
BLK
BLK
WHI
BLK
BLU/BLK
WHI
WHI
TANK HEATER
"KEEP WARM" HEATER
LEFT/OFF/RIGHT SWITCH
START SWITCH
SW2A
SW1A
SW1B
SW1C
SW1D
YEL
WHI/VIO
1
2
3
4
5
6
WHI
WHI
WHI/ORN
WHI/GRN
WHI/YEL
WHI/BLU
TIMER
SOL
BREW
YEL
SOL
SOL
LEFT
RIGHT
120 VOLTS A C
2 WIRE
SINGLE PHASE
DILUTION
41974.0000A 03/09 © 2009 BUNN-O-MATIC CORPORATION
41722 070209
Page 26
SCHEMATIC WIRING DIAGRAM TB6Q
GRN
OPTIONAL
READY INDICATOR
Chassis Ground
Earth Ground
N
BLU
BLK
L1
SW. &
THERMOSTAT
LIMIT
THERMOSTAT
BLK
BLK
WHI
BLK
BLU/BLK
WHI
WHI
TANK HEATER
"KEEP WARM" HEATER
LEFT/OFF/RIGHT SWITCH
START SWITCH
SW2A
SW1A
SW1B
SW1C
SW1D
YEL
WHI/VIO
1
2
3
4
5
WHI
WHI
WHI/ORN
WHI/GRN
WHI/YEL
TIMER
SOL
BREW
YEL
SOL
SOL
LEFT
RIGHT
120 VOLTS A C
2 WIRE
SINGLE PHASE
DILUTION
41975.0000A 03/09 © 2009 BUNN-O-MATIC CORPORATION
41722 070209
Page 27
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