JBL Speaker PC 600 User Manual

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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