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Old 13th June 2011, 04:09 PM   #1
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Default JBL GTO 14001

Theres a part in this that appears to be a thermal switch

The board location is SW1 The part number on it is JUC-21F and says 80 degress C


Wondering if anyone know where i can get one of theese or a good replacement part?
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Old 13th June 2011, 07:02 PM   #2
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Location: Louisiana
Is the one in the amp missing?
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Old 13th June 2011, 07:44 PM   #3
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The one in the amp is defective the back plate is missing
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Old 13th June 2011, 07:53 PM   #4
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Location: Louisiana
The original part should be available from JBL. If it's not, post a photo of it.
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Old 17th June 2011, 02:28 PM   #5
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Ok got the new part from JBL and put it in..

It appears that the driverboard for the power supply has been messed with ..


Amp will not power up at all no lights no nothing


I get 0 volts on all pins of the 595 besides the ones that have the battery voltage Like Pin 8 I think Pin 11 and 1 other one..

Any ideas on what to look for?
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Old 17th June 2011, 03:42 PM   #6
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You'll need to post the voltage on all pins of the 494.

Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:
Pin 9:
Pin 10:
Pin 11:
Pin 12:
Pin 13:
Pin 14:
Pin 15:
Pin 16:
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Old 17th June 2011, 03:55 PM   #7
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Ok found 1 problem there is a broken solder connection on 1 of the pins for the driverboard and will have to pull it and look..

Once i wiggle the board around i get the amps light to come on but it draws excessive current..
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Old 17th June 2011, 04:47 PM   #8
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Join Date: Nov 2003
Location: Louisiana
If someone pulled the driver board before and the main board is double-sided, there may be multiple damaged vias. If you pull the driver board, photograph the traces under it (unless you can remember them) so you can confirm that all of the top traces have continuity with the pins on the board.
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Old 17th June 2011, 05:48 PM   #9
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Yes the Vias is damaged on atleast 4 of them..

Whats the best way to try and repair them?
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Old 17th June 2011, 06:18 PM   #10
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Location: Louisiana
There's no single best way to reestablish the connections. I like drilling and using a jumper wire looped around the leg of the connector but that requires a small drill bit (#66-#60) and a bit of thought to make sure that you don't drill through other traces. You end up with something like the jumpers in the attached images.
Attached Images
File Type: jpg IMG_7322bx.jpg (60.1 KB, 27 views)
File Type: jpg IMG_7629bx.jpg (112.4 KB, 25 views)
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