Bunn TU3Q service manual Brew Timer Early Models, Wiring Diagram and check the wiring harness

SERVICE (cont.)	If continuity is not present as described, refer to the
BREW TIMER (Early Models)
	Wiring Diagram and check the wiring harness.

			6.	With a voltmeter, check the voltage across termi-
				nals TL1 and TL4 when the ON/OFF switch is in
				the ÒONÓ position and the START switch is mo-
				mentarily placed in the lower position. Connect
				the brewer to the power source. The indication
				must be:
	BUNN-O-	120		a) 120 volts ac for two wire 120 volt models for
	.
	MINUTES-MATICVAC
	P/N			approximately twenty seconds and then return
				to its previous indication.
				b) 230 volts ac for two wire 230 volt models for
				approximately twenty seconds and then return to
				is previous indication.
				c) 100 volts ac for two wire 100 volt models for
				approximately twenty seconds and then return to
				its previous indication.
			7.	Disconnect the brewer from the power source.
			If voltage is present as described, the timer is operat-
	FIG. 4 BREW TIMER	P2088.50	ing properly. Adjust the timer dial as required.
Location:			If voltage is not present as described, replace the timer.
	The brew timer is located in the hood. It consists		Removal and Replacement:
of the dial plate and circuit board.
			1.	Remove all wires from the timer.
Test Procedure:			2.	Remove the circuit board and dial plate from the
1.	Disconnect the brewer from the power source.			brackets.
2. Remove the wires from terminals TL3, TL4, & TL5			3.	Install new timer circuit board as described in Late
	of the timer and rotate the dial fully counterclock-			Model Timer section on the following pages.
	wise.		4.	Refer to Fig. 7 when reconnecting the wires.
3. With a voltmeter, check the voltage across termi-			5.	Install the Timer Setting decal, provided with the
	nals TL1 and TL2 when the ON/OFF switch is in			replacement timer kit, to the rear of the schematic
	the ÒONÓ position. Connect the brewer to the power			beneath the top cover.
	source. The indication must be:		6.	Adjust the timer as required. Refer to Late Model
	a) 120 volts ac for two wire 120 volt models.			Timer section on the following pages.

b)230 volts ac for two wire 230 volt models.

c)100 volts ac for two wire 100 volt models.

4. Disconnect the brewer from the power source. If voltage is present as described, proceed to #5.

If voltage is not present as described, refer to the Wir- ing Diagram and check the wiring harness.

5. Check for continuity across the white/orange and
white/yellow wires when the START switch is held
in the lower position.
If continuity is present as described, reconnect the
wires to terminals TL3, TL4, & TL5 of the timer board	OLD STYLE
and proceed to #6.
	FIG. 5 BREW TIMER TERMINALS	P2089.75
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