Bunn TB6Q User Manual

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® paperltersmustbeused  
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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