Manuals / Bunn / Kitchen Appliance / Coffeemaker

Bunn ITB/ITCB CONTROL BOARD -1 CONTROL BOARD Location, Test Procedures, Check for Power to board

Models: ITB/ITCB ICB/TWIN

1 30

Download 30 pages 63.74 Kb

Page 11

CONTROL BOARD

CONTROL BOARD

FIG. 11-1 CONTROL BOARD

Location:

The Control Board is located inside the top cover behind the front face plate.

Test Procedures:

The test procedures for the control board will vary depending upon the problems experienced by the brewer. Refer to the Troubleshooting section which is divided into three sections, Reﬁll Circuit, Heating Circuit, and Brewing Circuit.

Check for Power to board:

1.Insert one meter lead in J17-pin 9 and the other lead in J17-pin 11 (TR-2 to TR-5 ITB only).

2.With the power connected to brewer, the voltage reading to the board should be the line voltage rated for that model.

If no voltage is present, check wiring to the board. If voltage is present, and brewer does not power on, go to step 3

3.Check for line voltage at J15-1 BLK to J15-2 WHI (J14-1 to 2 ITB only)

If no voltage is present, replace the control board. If voltage is present, go to step 4

4.Check for 12VAC at J15-4 to J15-2 Yellow wires (J14-4 to J14-5 ITB only)

If no voltage is present, replace the trans- former. If voltage is present, and brewer does not power on, replace the control board.

Removal and Replacement:

1.Disconnect brewer from power source.

2.Disconnect the wires from the relay on the control board.

3.Disconnect all of the connectors from the control board.

4.Remove the two nuts securing the control board to the hood.

5.Tilt the control board inward to clear the display section.

6.Place the bottom edge of the new control board in the cradle, tilt the board forward, and secure with the two nuts to the hood.

7.Re-install connectors.

Faceplate Removal and Replacement:

1.Disconnect brewer from power source.

2.Disconnect the ribbon cable from the control board.

3.Models with faucet: Drain tank to below faucet outlet ﬁtting. Remove hose, nut and washer from faucet. Remove faucet assembly.

4.Remove the four screws securing the face plate to the hood.

5.Carefully pull the ribbon cable through the front opening of the hood.

6.Installation is the reverse order.

FIG. 11-2 FACEPLATE REMOVAL

11	42461 0911809

Image 11

Bunn ITB/ITCB CONTROL BOARD -1 CONTROL BOARD Location, Test Procedures, Check for Power to board, Removal and Replacement

Contents

BUNN-O-MATIC CORPORATION SERVICE & REPAIR MANUALITB/ITCB ICB/TWIN Infusion SeriesBUNN-O-MATIC COMMERCIAL PRODUCT WARRANTY INTRODUCTION CONTENTSReplace all protective shields or safety notices TROUBLESHOOTINGExercise extreme caution when servicing electrical equipment Follow recommended service proceduresRemove Level Probe and check TROUBLESHOOTING cont REFILL CIRCUIT PROBLEMPROBABLE CAUSE REMEDYInspect probe and tank assembly TROUBLESHOOTING cont HEATING CIRCUITPROBLEM Lime build up on temperatureNOTE Volume adjustments must be TROUBLESHOOTING cont BREWING CIRCUITPROBLEM disable the brew lockout featurePROBABLE CAUSE TROUBLESHOOTING contBREWING CIRCUIT cont PROBLEMREMEDY DIAGNOSTICSMESSAGE PROBABLE CAUSEFIG. 10-3 ICB TWIN COMPONENT ACCESS COMPONENT ACCESSFIG. 10-1 ICB COMPONENT ACCESS FIG. 10-2 ITB/ITCB COMPONENT ACCESSFaceplate Removal and Replacement Test ProceduresCheck for Power to board Removal and ReplacementTest Procedures MEMBRANE SWITCHFIG. 12-1 MEMBRANE SWITCH Location FIG. 12-2 MEMBRANE SWITCH CONTINUITYFIG. 13-2 EXPLODED VIEW BREW VALVE EARLY MODELS AND BYPASS VALVE ON ALL ICBsFIG. 13-1 EARLY BREW VALVE Location If no sound is heard as described, proceed to #4Removal and Replacement BREW VALVE LATE MODELS FIG. 14-1 LATE MODEL BREW VALVE LocationFIG. 14-2 LATE MODEL BREW VALVE Test ProceduresIf the sound is not heard as described, pro- ceed to # DisassemblyREFILL VALVES FIG. 15-1 REFILL VALVES Location If voltage is present, proceed to #CURRENT ICB & & ITB REFILL VALVESEARLY ICB EARLY ITCBTest Procedures TANK HEATERSFIG. 17-1 ICB TWIN TANK HEATERS Location FIG. 17-2 DV TANK HEATERSThe limit thermostat is located on the tank lid on the LIMIT THERMOSTATFIG. 18-1 LIMIT THERMOSTAT LocationTest Procedures TEMPERATURE PROBE FIG. 19-1 TEMPERATURE PROBE LocationFIG. 19-2 TEMPERATURE PROBE FIG. 19-3 TESTING TEMPERATURE PROBE Removal and Replacement CONTINUEDFIG. 20-2 CALIBRATION TEMPERATURE PROBE Removal and ReplacementCalibration FIG. 20-1 CALIBRATE TEMP PROBERemoval and Replacement VOLTAGE SELECTOR SWITCH FIG. 21-1 VOLTAGE SELECTOR SWITCH LocationTest Procedure FIG. 21-2 VOLTAGE SELECTOR SWITCH TERMINALSRemoval and Replacement POWER SWITCH FIG. 22-1 POWER SWITCH ICB SHOWN LocationFIG. 22-2 ROCKER SWITCH Test ProcedureSINGLE PHASE SCHEMATIC WIRING DIAGRAM iTCBA, iTCBB200V AC 2 WIRE 230V AC 2 WIRE120/208V AC 3 WIRE SCHEMATIC WIRING DIAGRAMITCB-DV & ITCB-C-DV 120V AC 2 WIREITCB-DV & ITCB-C-DV WITH FACTORY SWEETENERSCHEMATIC WIRING DIAGRAM 120V AC 2 WIRE 120/208V AC 3 WIRE 120/240V AC 3 WIRE SINGLE PHASE120V AC 2 WIRE 120/208V AC 3 WIRE 120/240V AC 3 WIRE SINGLE PHASE SCHEMATIC WIRING DIAGRAM ICB-DV120/208 OR 120/240 SCHEMATIC WIRING DIAGRAM ICB TWIN3 WIRE + GND SINGLE PHASE200V AC 2 WIRE 230V AC 2 WIRE SINGLE PHASE SCHEMATIC WIRING DIAGRAM iCBA, iCBB230 VOLTS AC SCHEMATIC WIRING DIAGRAM ICB TWIN 230V Chassis Ground TERM2 WIRE + GND SINGLE PHASE SINGLE & DUAL DILUTION MODELS AND MODELS w/OPTIONAL SWEETENER SCHEMATIC WIRING DIAGRAM ITB120V AC 2 WIRE + GROUND SINGLE PHASE