Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

jbl gto75.4 in protect
jbl gto75.4 in protect
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 23rd August 2010, 01:17 PM   #1
ampjunkielikeme is offline ampjunkielikeme  United States
diyAudio Member
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.


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.
  Reply With Quote
Old 23rd August 2010, 04:14 PM   #2
Perry Babin is offline Perry Babin  United States
diyAudio Member
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...).
  Reply With Quote
Old 26th August 2010, 03:57 AM   #3
ampjunkielikeme is offline ampjunkielikeme  United States
diyAudio Member
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.
  Reply With Quote
Old 29th August 2010, 08:55 PM   #4
ian33 is offline ian33
diyAudio Member
Join Date: Jun 2010
for that to happen i think you have a shot in that area or a leaky diode
  Reply With Quote


jbl gto75.4 in protectHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Horn enclosures w/ JBL 2226 and JBL 375. burtcheca Swap Meet 0 2nd August 2010 01:21 PM
specs of jbl 046TI-1S and jbl 726gs panduro Multi-Way 2 21st June 2010 07:45 PM
speaker protect norstar815 Solid State 4 1st June 2008 04:40 AM
protect light is on can you help? lilchriscustoms Solid State 4 18th May 2007 08:53 AM
Amplifier protect WayneB Solid State 1 18th June 2003 10:01 PM

New To Site? Need Help?

All times are GMT. The time now is 03:17 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio