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- Service & Repair Manual
Bunn TB3 Service & Repair Manual
Summary of TB3
Page 1
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 tb3/tb6 series including: tb3; tb3-lp; tb3q; tb3q-lp; tb6; tb6q starting with serial number: tu00020000
Page 2
Page 2 41722 012609 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) comp...
Page 3
Page 3 41722 070209 contents trouble shooting .............................................................................................................. 4 component acess ......................................................................................................... 10 control thermost...
Page 4
Page 4 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 ...
Page 5
Page 5 troubleshooting (cont.) brew cycle will not start (cont.) water is not hot probable cause remedy 3. On/off switch 4. Start switch 5. Timer 6. Solenoid valve 7. Water strainer/flow control (if equipped) 1. (a) limit thermostat (b) thermal cut-off (230v) caution - do not eliminate or bypass lim...
Page 6
Page 6 troubleshooting (cont.) inconsistent beverage level in dispenser consistently low beverage level in the dispenser spitting or excessive steaming 1. Strainer /flow control (if equipped) 2. Syphon system 3. Lime build-up caution - tank and tank com- ponents should be delimed regularly depending...
Page 7
Page 7 troubleshooting (cont.) spitting or excessive steaming (cont.) dripping from sprayhead water flows into tank continu- ously (on/off switch "on") water flows into tank continu- ously (on/off switch "off") beverage overflows dispenser 2. Control thermostat 1. Syphon system 2. Lime build-up caut...
Page 8
Page 8 troubleshooting (cont.) weak beverage dry coffee grounds remain in the funnel brewer is making unusal noises 1. Filter type 2. Coffee grind 3. Sprayhead 4. Funnel loading 5. Water temperature 1. Funnel loading 1. Solenoid 2. Plumbing lines 3. Water supply problem probable cause bunn® paper fi...
Page 9
Page 9 troubleshooting (cont.) brewer is making unusal noises (cont.) 4. Tank heater remove and clean lime off the tank heater. Problem probable cause remedy 41722 070209.
Page 10
Page 10 service this section provides procedures for testing and 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 equipmen...
Page 11
Page 11 service (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...
Page 12
Page 12 service (cont.) 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. 3. Check for continuity across the limit ...
Page 13
Page 13 service (cont.) tank heater location: the tank heater is located inside the tank and secured to the tank lid. 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 wir...
Page 14
Page 14 service (cont.) lighted on/off switch (tb3/tb3q) fig. 14-1 lighted on/off switch p/n 37080.0000 orange light fig. 14-2 lighted on/off switch terminals p/n 37080.0000 black 2 wht/vio white location: the on/off switch is located in the front of the hood, above and to the left of the brew funne...
Page 15
Page 15 service (cont.) on/off switch-tb6/q (sweetner ½ batch option-tb3/q) location: the switch is located on the front control panel. 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 a...
Page 16
Page 16 service (cont.) start switches location: the start switch is located in the front of the hood, above and to the right of the brew funnel. 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 termin...
Page 17
Page 17 service (cont.) inlet valves location: the solenoid valve(s) are located inside the trunk on the lower center part of the component bracket. So- lenoids in the early models are located in the hood. Test procedures: 1. Check the solenoid valve for coil action. With "on/ off" switch in the "on...
Page 18
Page 18 service (cont.) brew/dilution timer (tb3 & tb6) location: the timer is located in left side of the hood. 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 so...
Page 19
Page 19 service (cont.) brew/dilution timer (tb3 & tb6) (cont.) triacs: th-1/mv-1 brew solenoid th-2/mv-2 dilution solenoid fig. 19-1 brew/dilution timer triacs 41722 070209.
Page 20
Page 20 fig. 20-1 digital timer fig. 20-2 digital timer digital brew timer (tb3q & tb6q) service (cont.) location: the timer is located in left side of the hood. Test procedure note: do not remove or install wires while timer board is installed. Pressure applied to one side may cause damage to the b...
Page 21
Page 21 service (cont.) digital brew timer (tb3q & tb6q) (cont.) triacs: q-1/mv-2 brew solenoid output mv-1 line in fig. 21-1 digital timer triacs 41722 070209.
Page 22: Schematic Wiring Diagram
Page 22 41722 070209 schematic wiring diagram tb3q (optional) ready indicator blu/blk blk sw. & thermostat limit thermostat l1 blk blu/blk blk green tank heater n whi whi whi whi sw2 "keep warm heater" sw1 blk whi/vio whi/vio whi whi whi/ora whi/grn whi/yel sol 1 2 3 4 5 brew timer 37234.0001a 08/04...
Page 23
Page 23 41722 070209 schematic wiring diagram tb3, tb3b, tb3-lp optional ready indicator switch & thermostat limit thermostat "keep warm" heater on/off switch 37234.0007a 02/08 © 2008 bunn-o-matic corporation start switch dilution brew/dilution timer brew tank heater blu/blk blk blk blk 6 5 4 3 2 1 ...
Page 24: Schematic Wiring Diagram
Page 24 41722 070209 37234.0008b 10/08 © 2008 bunn-o-matic corporation schematic wiring diagram tb3b w/half-batch 100 volts ac 120 volts ac 2 wire + gnd single phase optional ready indicator switch & thermostat limit thermostat "keep warm" heater start switch brew/dilution timer tank heater blu/blk ...
Page 25
Page 25 41722 070209 limit thermostat blu/blk tank heater "keep warm" heater start l1 n blk whi blk brew timer whi whi green whi/yel whi/ora blk whi/grn whi/grn whi/vio whi brn/whi whi/vio whi whi whi/blk schematic wiring diagram tb3q w/sweetener & empty bag detect 120 volts ac 2 wire single phase t...
Page 26: Schematic Wiring Diagram Tb6
Page 26 schematic wiring diagram tb6 whi/orn brn/blk left/off/right switch sw1b sw1d sw1c sw1a tank heater blk blu/blk l1 whi blk blk whi sw. & thermostat whi 120 volts a c 2 wire single phase "keep warm" heater limit thermostat whi/vio whi/yel whi/blu timer 5 6 4 3 2 1 whi/grn whi n whi 41974.0000a...
Page 27
Page 27 schematic wiring diagram tb6q whi/orn brn/blk left/off/right switch sw1b sw1d sw1c sw1a tank heater blk blu/blk l1 whi blk blk whi sw. & thermostat whi 120 volts a c 2 wire single phase "keep warm" heater limit thermostat whi/vio whi/yel timer 5 4 3 2 1 whi/grn whi n whi 41975.0000a 03/09 © ...