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Subwoofer stops working after about an hour's use. Authorized repair technician could find nothing wrong.

Our JBL/JRX118/SP subwoofer stops working after about an hour. We just had it at an authorized repair center that could find nothing wrong with it after testing it and taking it completely apart. Any ideas?

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In case of a transistor which is faulty, could short the power supply in circuitry, and this happens after the transistor gets heated up. So you might wanna inspect the transistors on board to replace if found faulty.

--Sandy

Posted on May 30, 2009

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One year waranty period from JBL on the electronics.

To find the authorized JBL service center in your area:


  • Go to: www.jbl.com
  • Click on United States
  • Click on Support at the top
  • Click on Find My Product
  • Enter your Model Number or Select your Product from the drop down list; then SUBMIT or SEARCH
  • On the list on the left side, click on Service Center
  • Supply your zip code at the next screen, then FIND
  • A list of service centers in your area will come up.

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Depending of the type of Subwoofer that required your system.

A) Amplified Subwoofer. (With 110volts A.C. cord attached to the sub)
The subwoofer electronics circuit needs repair or change.
You will find a compatible subwoofer for this type of subwoofer in audio appliance stores.

B)Not amplified Subwoofer (No 110volts A.C. cord attached to the sub)

Bring your sound system to a technician to have the soldering remaked to the devices bolted on the main heatsink.
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This type of subwoofer can mostly be buy in kit with the satellites speakers.
And need to match thee impedance of the output of your system.

Search for ( 4 ohm or 6 ohm 8 ohm ) near the Sub outlet behind your system.

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This can be very difficult and could make for alot of expensive deposits. Running out of parts is an ongoing problem with all electronics and sometimes replacement is the most cost effective option.

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