Bunn JDF-4S service manual Problem Probable Cause

TROUBLESHOOTING (cont.)

PROBLEM PROBABLE CAUSE REMEDY

Unit is not working 1. Step-down transformer.

Check for 120/24 or 230/24 vac. If no 24vac reading, replace step-down transformer.

	2. Main control board.	If 24 vac present and no LED’s lit,
		replace control board..
Difficulty brixing and/or weak bev-	1. Product viscosity or too cold.	Thorough thaw of product before
erage		use (35° - 40°)
	2. Low water pressure.	Maintain 20 psi or higher and a
		minimum flow rate of 3 fl oz/sec.
	3. High water pressure.	Over 100 psi, install a pressure
		regulator and set to 50 psi.
	4. Dispense valve adjustment set-	A) Perform 3 second water dispense
	ting.	test. Factory setting is 1.0 oz/sec.
		Acceptable water flow rate is .-0.8
		to 1.5 oz/sec depending on the mix
		ratio (4+1).
		B) Adjust water to proper mix ratio.
		Once water is set, adjust motor
		speed to achieve brix %.
	5. Brix ratio.	Check for proper brix ratio per prod-
		uct using Total Dispense method
		and or refractometer method.
Difficulty brixing and/or weak bev-	1. Pump tubing.	Inspect, clean, or replace tubing
erage		and pump rotor/rollers for ease of
		rotation.
	2. Use of portable water pump.	A) Follow plumbing requirements
		for pressure and flow rate.
		B) Source another portable pump
		or water supply that meets require-
		ments.
Difficulty brixing bag-in-box	Vacuum leak	Inspect all lines and connections
		from bag-in-box connector to bottle
		adapter assembly.

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