Bunn 41722.0000A manual Digital Brew Timer TB3Q & TB6Q, Terminals ½ batch connector

SERVICE (cont.)

DIGITAL BREW TIMER (TB3Q & TB6Q)

FIG. 20-1 DIGITAL TIMER

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 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:

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.

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.

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.

5.With a voltmeter, check the input start voltage across terminals TL2 and TL5. Connect the brewer

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:

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.

	TRM-1
	TRM-2
SW1	TRM-3
J-2	TRM-4
J-1	TRM-5

FIG. 20-2 DIGITAL TIMER

Terminals:

J-2 ½ batch connector

J-1 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

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