JBL PC 600 Center Performance Series
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 wiring diagram and 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 VIEW
CABINET
(NOT FOR SALE)
1
2
20
3
4
5
6
7
21
20
8
19
9
10
11
12
16
18
17
15
13
14
ITEM
NO.
ITEM
NO.
DESCRIPTION
QTY.
PART NO.
DESCRIPTION
QTY.
PART NO.
1. SCREW, .25-20 x .75, MS, BHXS, BLK
2. MOUNTING BRACKET, WALL
3. TWEETER GASKET
4. SCREW, 6-32 x .38, MS, PPH, ZINC
5. TWEETER
6. TWEETER FACEPLATE
7. SCREW. 6x.75, PB, HXS, ZINC
8. GRILLE CUP
9. MIDRANGE GASKET
10. MIDRANGE DRIVER
11. SCREW, 6x.75, PB, HXS, ZINX
12. JBL LOGO
2
2
1
2
1
1
4
4
1
1
4
1
1
8
2
902301-012
336774-001
336613-001
900302-006
335663-001
335695-001
908302-012
333249-001
335656-001
336327-001
908302-012
335470-002
336629-001
903802-016
335899-001
16. WOOFER GASKET
17. SCREW, #6x.75 PPHD, PB, BLK
18. NETWORK
19. GASKET, TERMINAL CUP
20. SCREW, #6x.75, PB, HXS, BLK
21. TERMINAL CUP
22. OWNERS MANUAL
23. SURVEY CARD
24. PAD, END TOP & BOTTOM
25. CARTON, KIT
26. CARTON, MASTER
27. BUMPER
28. WRENCH, ALLEN
29. WARRANTY CARD
2
4
1
1
6
1
1
1
2
1
1
4
1
1
335657-001
63563
336773-001
351317-001
908301-012
336616-001
336608-001
331384-001
336632-001
337058-001
336631-001
301821-001
336600-001
331994-001
13. GRILLE
14. SCREW, #8x1, PB, HXS, ZINC
15. WOOFER
Note: A Phillips screwdriver and Allen wrench (hex key) 7/64" and 5/32" sizes are required to service this product
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