onix oa21 + soap. - diyAudio
Go Back   Home > Forums > Design & Build > Parts
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Parts Where to get, and how to make the best bits. PCB's, caps, transformers, etc.

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 27th June 2009, 02:58 PM   #1
mangoy is offline mangoy  United Kingdom
diyAudio Member
Join Date: Jun 2009
Default onix oa21 + soap.

Help desperately needed. I have had this amp for over twenty years and have hardly given it any thought as it has been faultless. Now,however, I am stricken. The oa21 (e) has started blowing it's internal fuse. Anybody have a clue as to why or what to look at first? Does anyone have a schematic? Any help putting my amp back on it's feet would make me eternally grateful.
  Reply With Quote
Old 30th June 2009, 08:38 PM   #2
mjf is offline mjf  Austria
diyAudio Member
Join Date: Jan 2009
Location: Austria
probably the outputstage is damaged - that often happens......
i have no schematic (it is hard to find).
do you have a multimeter?
so you can measure the emitter res at the output transistors (0,22 ohm or so.....) and so on..............
perhaps there are three fuses,one for the mains and two for the output to speaker.............? which one is bad?
you can have a look if there are burnt parts or damaged (psu)elcos...........
  Reply With Quote
Old 1st July 2009, 12:15 AM   #3
mangoy is offline mangoy  United Kingdom
diyAudio Member
Join Date: Jun 2009
Well there is no schematic to be had. I have got an email from Tony Brady and he doesn't have one.The fuse that blows is the mains 2.5v time delay one. On advice received I disconnected the transformer from the pcb, fuse didn't blow and led on indicator remained dark. I have now to check the rectifier and output transistors. Hopefully it will be one of them that is faulty and i will only have to find suitable replacements for these old parts. Hopefully mr. Brady will reply to my last entreaty and recommend something.
  Reply With Quote
Old 1st July 2009, 12:15 AM   #4
mangoy is offline mangoy  United Kingdom
diyAudio Member
Join Date: Jun 2009
Also I have no multimeter and I cannot see any obvious damage.The next stage is to find someone to diagnose exactly what has occurred and then source replacements.
  Reply With Quote


Hide 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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Onix & soap needs a re-cap fatmarley Parts 28 7th December 2013 08:07 AM
ONIX OA21 and SOAP Connection cocktailpiano Solid State 1 22nd November 2009 09:44 PM
Onix OA21 + SOAP Compatibility BradNad Solid State 19 1st August 2006 12:26 PM
Output of Onix Soap PS kptseng Solid State 2 16th December 2005 12:12 AM

New To Site? Need Help?

All times are GMT. The time now is 05:37 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2