jbl gto75.4 in protect - diyAudio
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Old 23rd August 2010, 01:17 PM   #1
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Join Date: Feb 2009
Default jbl gto75.4 in protect

the amp is in protect... it doesn't seem to have any shorted outputs or bad power supply transistors.

tl494

pin1- 0.002
pin2- 4.995
pin3- 0.057
pin4- 4.986
pin5- 1.471
pin6- 3.650
pin7- 0.002
pin8- 12.59
pin9- 0.002
pin10- 0.002
pin11- 12.59
pin12- 12.59
pin13- 4.996
pin14- 4.996
pin15- 4.995
pin16- 3.93 reads this with or without the remote hooked up.
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Old 23rd August 2010, 04:14 PM   #2
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Join Date: Nov 2003
Location: Louisiana
Remove Q22 to see if the amp will power up and produce audio. This will disable the protection circuit so you'll need to have ALL power semiconductors clamped to the heatsink and have a 10 amp fuse in the B+ line BEFORE applying power to the amp. Post what problems you find (DC on speaker terminals, excessive current draw...).
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Old 26th August 2010, 03:57 AM   #3
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Join Date: Feb 2009
i pulled Q22 and it now powers up fine (pulls very little amperage)

it has sound out of the front channels. i dont get anything buy static out of the rear channels

and before i could check for dc on the speaker terminals , a transistor (Q452)in one of the rear channels just exploded...lol
the outputs dont read to be shorted.

Last edited by ampjunkielikeme; 26th August 2010 at 04:11 AM.
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Old 29th August 2010, 08:55 PM   #4
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Join Date: Jun 2010
lol
for that to happen i think you have a shot in that area or a leaky diode
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