Help me troubleshoot an amp using STK461 chip - diyAudio
Go Back   Home > Forums > Amplifiers > Chip Amps

Chip Amps Amplifiers based on integrated circuits

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 1st July 2006, 05:37 PM   #1
diyAudio Member
 
Join Date: Mar 2004
Location: Hobart, Tasmania
Send a message via MSN to noodle_snacks
Default Help me troubleshoot an amp using STK461 chip

I have aquired an amplifier with one working chanel, and one channel that seems to stick to one power supply rail (DC voltage). It uses an STK461 chip amp and the number and structure of the components inside looks relatively simple. Whilst i can aquire a replacement chip i am wondering what other tests i should run or common faults to look for before i go buying a chip that i don't need. Any pointers or links to tutorials etc?

Click the image to open in full size.

Click the image to open in full size.
  Reply With Quote
Old 2nd July 2006, 03:22 AM   #2
jaycee is offline jaycee  United Kingdom
diyAudio Member
 
Join Date: Apr 2004
Location: Norwich, UK
There's very little externally to go wrong with these chips. The only thing I can think of is to check that the DC isn't coming from a preamp stage (eg a missing rail to one of the opamps). This is unlikely though.

It is likely the chip is damaged possibly due to a short on the channel. Replacing the chip is the most likely fix.
  Reply With Quote
Old 3rd July 2006, 03:49 AM   #3
Leolabs is offline Leolabs  Malaysia
diyAudio Member
 
Leolabs's Avatar
 
Join Date: Dec 2004
Location: Bukit Mertajam
Send a message via MSN to Leolabs
Maybe you need this.
Attached Files
File Type: pdf stk461.pdf (66.5 KB, 155 views)
  Reply With Quote
Old 3rd July 2006, 12:24 PM   #4
sasmit is offline sasmit  India
diyAudio Member
 
Join Date: May 2006
Send a message via Yahoo to sasmit
The chip is damaged,I have had simmilar experiences with STK series IC's ~ STK 459 and 4141 ,these chips are very sensitive to shorts in the output.But I doubt if you will be able to obtain a genuine STK 461 as these became obsolete arnd 10 years back...
  Reply With Quote
Old 3rd July 2006, 12:33 PM   #5
ostie01 is offline ostie01  Canada
diyAudio Member
 
Join Date: Mar 2005
Location: quebec
The chip you're looking for is available at http://pacificsemi.com/search.php for $6.00 each.

Just an advice, when you install those kind of chip, place an alligator clip with a wire at each pin ,hook up to the ground .Just move the clip from pin to pin when you touch the pin with the iron.These are very sentitive to static.
  Reply With Quote
Old 5th July 2006, 02:46 AM   #6
diyAudio Member
 
jamesjung21's Avatar
 
Join Date: Dec 2003
Location: New Zealand
Quote:
These are very sentitive to static.
Mine was seriously abused with static energy but worked perfectly fine.

Watch out for counterfeit STKs by the way folks

James
  Reply With Quote
Old 5th July 2006, 10:37 PM   #7
diyAudio Member
 
Join Date: Mar 2004
Location: Hobart, Tasmania
Send a message via MSN to noodle_snacks
my supplier says they sell STK461, I will buy a replacement chip, remove the old one and see how i go. The old one has lots of pins, is the best way to remove it to snip the pins at the base then remove, then pull the pins out individually?
  Reply With Quote
Old 5th July 2006, 10:53 PM   #8
ostie01 is offline ostie01  Canada
diyAudio Member
 
Join Date: Mar 2005
Location: quebec
Ya, cut those with wire cutter, will be a lot easier,but again, be careful with the iron when you touch the pins from the new IC, ground those pins
  Reply With Quote
Old 5th July 2006, 11:44 PM   #9
diyAudio Member
 
Join Date: Mar 2004
Location: Hobart, Tasmania
Send a message via MSN to noodle_snacks
What is the best way to ground the pins? Run an alligator clip to somewhere (where), or do i just keep them all connected (so no voltage between the pins)? Sorry for being a tad ignorant.
  Reply With Quote
Old 5th July 2006, 11:58 PM   #10
ostie01 is offline ostie01  Canada
diyAudio Member
 
Join Date: Mar 2005
Location: quebec
Just connect to case or body of the amp
  Reply With Quote

Reply


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
System Troubleshoot: Need Help ronfi Analogue Source 2 17th October 2008 11:07 PM
Help me troubleshoot this design, please teemuk Solid State 19 7th August 2006 11:07 PM
Technics SL-J90 troubleshoot Samson Analogue Source 1 30th December 2004 10:53 AM
My P68 sub amp just went poof - help me fix/troubleshoot it! Jonathan M Solid State 21 23rd December 2002 08:08 PM
Help - Troubleshoot arkay Tubes / Valves 16 5th January 2002 06:53 AM


New To Site? Need Help?

All times are GMT. The time now is 03:22 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2