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

Solid State Talk all about solid state amplification.

JVC JA-S55 amp troubleshooting
JVC JA-S55 amp troubleshooting
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 20th January 2005, 08:26 AM   #1
80sJunior is offline 80sJunior  United States
diyAudio Member
 
Join Date: Jan 2005
Location: Austin, Texas
Question JVC JA-S55 amp troubleshooting

Recently purchased an early 80s vintage JVC integrated amp. Very nice looking, but apparently had never been opened/cleaned during its life, very, very dusty. Upon initial power up, amp would shut down after about 5 seconds, everytime.

Went ahead and cleaned her out with compressed air and brushes. On one blast a small metal pin from a watch band flew out... Ahah! Theres my short... and when I powered her up after dusting, it played perfectly with the matching JVC tuner. That is until I started tuning down lower on the dial. Beyond half way, static, clicks and loud pops, and the amp would shut down.

Okay, now I'm thinking I have a tuner problem. Crack that open and clean it, but it is already very clean since as it is a sealed cabinet. Power up again and no change. Decide to use Deoxit 5 contact cleaner on all the amps pots and switches as recommended by folks on the Audiokarma forum. Only pots I did not spray where the speaker selector and balance adj since they are sealed.

Now when I power up, the amp instantly has dancing meters and pops, shutting down again and again. Even with a different source or no source at all, things have gotten worse with the cleaning. Turning dials and throwing switches, does not eliminate or increase the noise. The problem stays the same.

I now need assistance with where to go next. Is there some kind of amp troubleshooting decision tree that I can follow to isolate THE source of the problem? I see no visible signs of overheating, corosion or leaking caps. Do I open up all the pots and clean them by hand?

Tired of cleaning everything without knowing the source of the problem, as I am likely to make things worse... Ooops, too late I already have!


TIA,

Junior
Audiokarma member newbie and now a newbie over here!
  Reply With Quote

Reply


JVC JA-S55 amp troubleshootingHide 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
need help troubleshooting an amp emremeydan Solid State 12 28th January 2008 11:16 PM
Zen V8 Troubleshooting moe29 Pass Labs 13 20th March 2006 04:44 PM
Help troubleshooting Zen V4 ophilip Pass Labs 18 11th February 2006 01:39 AM
help troubleshooting this diy pre-amp zobsky Tubes / Valves 21 3rd November 2003 12:06 AM
Troubleshooting MikeBike Solid State 3 30th September 2001 05:19 PM


New To Site? Need Help?

All times are GMT. The time now is 06:31 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 16.67%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio
Wiki