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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
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BUNN-O-MATIC COMMERCIAL PRODUCT WARRANTY Bunn-O-Matic Corp. (“BUNN”) warrants equipment manufactured by it as follows: 1) All equipment other than as specified below: 2 years parts and 1 year labor. 2) Electronic circuit and/or control boards: parts and labor for 3 years. 3) Compressors on refrigeration equipment: 5 years parts and 1 year labor. 4) Grinding burrs on coffee grinding equipment to grind coffee to meet original factory screen sieve analysis: parts and labor for 3 years or 30,000 po
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Contents Trouble Shooting .............................................................................................................. 4 Component Acess ......................................................................................................... 10 Control Thermostat ........................................................................................................ 10 Limit Thermostat .........................................................................................
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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 per formed only by qualified ser vice person- nel. • All electronic components have 120 volt ac and low voltage dc potential on their terminals
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TROUBLESHOOTING (cont.) PROBABLE CAUSE REMEDY PROBLEM Brew cycle will not start (cont.) 3. ON/OFF Switch Refer to Service - ON/OFF Switch for testing. 4. Start Switch Refer to Service - Start Switch for testing procedures. 5. Timer Refer to Service - Timer for test- ing procedures. 6. Solenoid Valve Refer to Service - Solenoid Valve for testing procedures. 7. Water strainer/flow control (A) Direction of flow arrow must (If equipped) be pointing towards brewer. (B) Remove the str
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TROUBLESHOOTING (cont.) PROBLEM REMEDY PROBABLE CAUSE 1. Strainer /flow control (A) Direction of flow arrow must Inconsistent beverage level in dispenser (If equipped) be pointing towards the brewer. (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 CAUTION - Tank and tank com- excessive lime deposits. Delime
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TROUBLESHOOTING (cont.) PROBLEM PROBABLE CAUSE REMEDY Spitting or excessive steaming 2. Control Thermostat Refer to Service - Control Ther- (cont.) 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 CAUTION - Tank and tank com- excessive lime deposits. Delime ponents should be delimed as required. regularly depending on local water conditions. Excessi
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TROUBLESHOOTING (cont.) PROBLEM PROBABLE CAUSE REMEDY Weak beverage 1. Filter Type BUNN® paper filters must be used for proper extraction. 2. Coffee Grind A fine or drip grind must be used for proper extraction. 3. Sprayhead 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 Place an empty funnel on an empty dispenser benea
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TROUBLESHOOTING (cont.) PROBLEM PROBABLE CAUSE REMEDY Brewer is making unusal noises 4. Tank Heater Remove and clean lime off the (cont.) tank heater. 41722 070209 Page 9
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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 specifi
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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. If voltage is present as described, reinstall the capillary 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. Disconne
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SERVICE (cont.) LIMIT THERMOSTAT If continuity is present as described, the limit thermostat 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
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SERVICE (cont.) TANK HEATER HEATER RESISTANCE 1680W-120V 7.9 - 9.2 1680W-100V 5.5 -6.4 1680W-230V 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
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SERVICE (cont.) Removal and Replacement: LIGHTED ON/OFF SWITCH (TB3/TB3Q) 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
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SERVICE (cont.) ON/OFF SWITCH-TB6/Q (Sweetner ½ Batch Option-TB3/Q) WHI/VIO BLACK PINK optional ½ batch P/N 03356.0003 GRAY Non Lighted 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. BRN/WHI 3. Check for continuity across the center and right and across center and left terminals in
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SERVICE (cont.) START SWITCHES WHI/YEL to Timer T5 WHI/ORN to Timer T3 P/N 37079.0000 P/N 37080.0001 Non Lighted 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 Test Procedure: to Timer T5 1. Disconnect the brewer from the power source. 2. Remove the wires from all four terminals. GREEN 3. Check for continuity across the two terminals on the right side of the switch when
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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
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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 s
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SERVICE (cont.) BREW/DILUTION TIMER (TB3 & TB6) (cont.) FIG. 19-1 BREW/DILUTION TIMER TRIACS Triacs: TH-1/MV-1 Brew solenoid TH-2/MV-2 Dilution solenoid 41722 070209 Page 19
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SERVICE (cont.) to the power source, turn on the "ON/OFF" switch DIGITAL BREW TIMER (TB3Q & TB6Q) 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 Re
