JBL owner manual JBL Northridge EC35, View, Wiring Diagram, Exploded

JBL Northridge EC35

JBL Loudspeaker Troubleshooting/Repair Tips

Most customers prefer to do simple loudspeaker repairs themselves. By following the steps below, a majority of loudspeakers can be returned to their original factory performance with minimum effort. Choose the example that best describes the problem you are experiencing.

Problem 1: No sound or distorted sound from one loudspeaker in a pair (or set)

Connect the dead/distorting loudspeaker to a different amplifier channel (one that had a functioning loudspeaker connected to it). If it functions normally, the problem is not loudspeaker-related. If the loudspeaker still makes no sound or sounds distorted, a wire may have become loose or disconnected, the network (also known as a crossover) may be defective, the drivers (woofer, tweeter, etc.) may be defective or, in very rare cases, all may be defective.

Refer to the exploded view below. The network is a small circuit board found on the inside of the terminal cup, or mounted to an inside wall of the enclosure. It sends low-frequency sounds to the woofer, high-frequency sounds to the tweeter and, if applicable, mid-frequency sounds to the midrange driver. Make sure all wires are secure and connected. Look for components on the network that look burnt, “bulged,” or abnormal. If everything looks normal, connect the network to the drivers from another matching loudspeaker. MAKE SURE you attach the correct wires to each driver – mid- and low-frequency sounds can damage the tweeter! If there is still no sound or distorted sound, the network is defective. If there is clean undistorted sound, the drivers are defective.

Problem 2: No sound or distorted sound from one or more (but not all) drivers in an enclosure

Remove the problem driver(s) from the enclosure and make sure all wires are secure and connected. If they are, proceed with the following test: Woofer or midrange driver – Connect the driver’s + and – input terminals directly to the loudspeaker wires from your receiver/amplifier and play some music at a reasonable volume. If the driver now sounds normal (produces a clean, undistorted sound), the network is most likely defective. Tweeter – Replace the tweeter with a functioning tweeter from another loudspeaker. If the tweeter now functions normally (produces clean, undistorted sound), the original tweeter is defective. If the replacement tweeter also sounds distorted or produces no sound, the network is most likely defective.

Problem 3: Loudspeakers distort, rattle or pop at higher volumes

This is usually NOT a loudspeaker problem. Common causes are too much power (playing the loudspeakers too loud and causing them to distort), an amplifier with not enough power (the amplifier can’t produce the required volume without distorting), excessive equalization (turning the tone controls too far clockwise, and/or engaging the loudness/bass boost button on your receiver) or some combination of the above. If only one loudspeaker is exhibiting the problem, and you’re confident that it’s not caused by too little power/too much power/excessive equalization, see solutions for Problems 1 and 2.

WIRING DIAGRAM					EXPLODED
	MIDRANGE				VIEW
	TRANSDUCER
	351771-001
					ORN/BLK
HIGH-FREQUENCY		YEL/BLK YEL	WHT/BLK	WHT	ORN
TRANSDUCER
338035-001
					LOW-FREQUENCY
	RED				TRANSDUCERS
					351770-001
	BLK
	RED				GRN/BLK
	BLK				GRN
		CROSSOVER NETWORK
		351615-001

10 (2) 15 (8) 6 7 14 18 8 9 (2)

EC35 Cabinet – Not for Sale

17 21 20 23 22

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19 13 16 (8) 25 12

ITEM				ITEM
NO.	DESCRIPTION	QTY.	PART NO.	NO.	DESCRIPTION	QTY.	PART NO.
1.	Outer Carton (Black)	1	351607-001	14.	Screw (tweeter)	2	905402-010
	(Beech)		351607-002		MS PHH H/L 6-19 x 5/8 ZNC
	(Cherry)		351607-003	15.	Screw (tweeter faceplate, midrange)	8	908302-012
2.	Owner’s Manual	1	350038-002		PB, HXS, #6 x 3/4 ZNC
3.	End Pad	2	351608-001	16.	Screw (term cup/xover)	8	882-41110-12
4.	Bump-On Foot	4	330104-001		6 x 3/4, PAN, PH, PB, BLK ZINC, LCS
5.	Warranty Card	1	338322-001	17.	Screw (woofer) PB, HXS, #8 x 3/4 ZNC	8	903802-012
6.	Tweeter	1	338035-001	18.	Tweeter Hold-Down Bar	1	338059-001
7.	Tweeter Gasket	1	339527-001	19.	Crossover Network	1	351615-001
8.	Tweeter Faceplate	1	350129-001	20.	Trim Ring (midrange)	1	351769-001
9.	Woofer	2	351770-001	21.	Midrange	1	351771-001
10.	Trim Ring (woofer)	2	351772-001	22.	Grille Retainer (Black mdl)	4	333249-001
11.	Grille	1	351613-001		(Beech/Cherry mdls)		333249-003
12.	Port Tube	1	350065-001	23.	Logo (cabinet)	1	350542-001
13.	Terminal Cup	1	351317-001	24.	Flower Pot, Plastic	1	351939-001
				25.	Shorting Straps (set)	1	CS06-6

Note: A Phillips screwdriver and Allen wrench (hex key) 7/64" and 5/32" sizes are required to service this product