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

Capacitor doubt
Capacitor doubt
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
Reply
 
Thread Tools Search this Thread
Old 29th September 2020, 12:31 PM   #1
imraneesa is offline imraneesa
diyAudio Member
 
Join Date: Apr 2016
Default Capacitor doubt

hi all,

I have this amp with shorted output transistors for one channel.
There is a capacitor that connecting rca input positive signal to the secondary ground via a resiator. The designation on the board shows as it is ceramic disk type capacitor but I found 10uf 16v caps. I found those caps burst for two channels. Others two values gone too low. I expecting if somebody had interfered with them or I dont know if it is factory itself. Attaching image of C301 and C401.
Please suggest what to use.
Attached Images
File Type: jpg 20200929_081953.jpg (740.7 KB, 75 views)
File Type: jpg 20200929_083033.jpg (561.0 KB, 76 views)
__________________
Scope, Multimeter, soldering, desoldering, hot air, 30v 50amp DC power supply.
  Reply With Quote
Old 29th September 2020, 12:37 PM   #2
Mooly is offline Mooly  United Kingdom
diyAudio Moderator
 
Mooly's Avatar
 
Join Date: Sep 2007
Capacitor doubt
A 10uF cap would never be found connecting an audio input to ground... it would short the audio.

Small value ceramics are reasonable and would be used to provide RF suppression.

Is this a car amp?
  Reply With Quote
Old 29th September 2020, 12:40 PM   #3
Mooly is offline Mooly  United Kingdom
diyAudio Moderator
 
Mooly's Avatar
 
Join Date: Sep 2007
Capacitor doubt
Quote:
Originally Posted by Mooly View Post

Is this a car amp?
Ignore that bit I thought it was posted somewhere else.
  Reply With Quote
Old 29th September 2020, 12:40 PM   #4
imraneesa is offline imraneesa
diyAudio Member
 
Join Date: Apr 2016
Yes it is car amplifier. Then this is very strange.
__________________
Scope, Multimeter, soldering, desoldering, hot air, 30v 50amp DC power supply.
  Reply With Quote
Old 29th September 2020, 12:41 PM   #5
Mooly is offline Mooly  United Kingdom
diyAudio Moderator
 
Mooly's Avatar
 
Join Date: Sep 2007
Capacitor doubt
Very strange... it does sound like it has been 'got at' then.
  Reply With Quote
Old 29th September 2020, 01:30 PM   #6
Perry Babin is offline Perry Babin  United States
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Post a photo showing about 1/4 of the bottom of the board, including the RCA jack corner of the board at one corner of the photo.
__________________
Anyone who purchased the repair tutorial, email me (babin_perry@yahoo.com) if you want to download the latest version.
  Reply With Quote
Old 29th September 2020, 03:18 PM   #7
imraneesa is offline imraneesa
diyAudio Member
 
Join Date: Apr 2016
Picture attached.
Attached Images
File Type: jpg 20200929_111718.jpg (892.1 KB, 58 views)
__________________
Scope, Multimeter, soldering, desoldering, hot air, 30v 50amp DC power supply.
  Reply With Quote
Old 29th September 2020, 03:57 PM   #8
Perry Babin is offline Perry Babin  United States
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Is this a JBL 75.4
__________________
Anyone who purchased the repair tutorial, email me (babin_perry@yahoo.com) if you want to download the latest version.
  Reply With Quote
Old 29th September 2020, 04:11 PM   #9
imraneesa is offline imraneesa
diyAudio Member
 
Join Date: Apr 2016
It is infinity Reference series amp.
__________________
Scope, Multimeter, soldering, desoldering, hot air, 30v 50amp DC power supply.
  Reply With Quote
Old 29th September 2020, 04:13 PM   #10
Perry Babin is offline Perry Babin  United States
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
For you or anyone asking for help, PLEASE do all you can to help those who are trying to help you and including the make/model number in the subject line would be a huge help.

What is the model?
__________________
Anyone who purchased the repair tutorial, email me (babin_perry@yahoo.com) if you want to download the latest version.
  Reply With Quote

Reply


Capacitor doubtHide 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
Upsample Doubt lduarte1973 miniDSP 0 27th March 2013 03:46 PM
KT88 doubt tidalweapon Tubes / Valves 7 17th April 2011 03:49 PM
doubt swaroopvg Power Supplies 0 1st July 2006 05:27 PM
EAS/ELF doubt rs1026 Chip Amps 8 9th November 2004 06:45 PM


New To Site? Need Help?

All times are GMT. The time now is 04:52 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Copyright ©1999-2020 diyAudio
Wiki