soundstream picasso PCA2.260 dont turn on - diyAudio
Go Back   Home > Forums > General Interest > Car Audio

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 17th July 2012, 12:05 AM   #1
diyAudio Member
 
Solosound's Avatar
 
Join Date: Jun 2008
Unhappy soundstream picasso PCA2.260 dont turn on

I have now an Asian design sound stream Picasso pca2.260
Click the image to open in full size.
The amplifier don't turn on
I found damaged the 2 next transistors
Click the image to open in full size.
I changed but the amplifier continue death

the voltages from the TL494cn
1 1.45
2 3.10
3 4.67
4 0.04
5 1.5
6 3.4
7 0.00
8 11.7
9 0.0000
10 0.0035
11 11.7
12 11.7
13 4.97
14 4.97
15 4.97
16 5.8
I need a little help from my friends
  Reply With Quote
Old 17th July 2012, 12:36 AM   #2
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Pin 16 is being driven high. That's shutting the pulses down. Find what's driving pin 16. If it's a transistor, remove the transistor to see if the amp will power up and produce audio. Be careful because this will disable the protection circuit for the amp.
  Reply With Quote
Old 26th July 2012, 12:22 AM   #3
diyAudio Member
 
Solosound's Avatar
 
Join Date: Jun 2008
Greetings to all.
Thanks to Perry's tutorial, I found the diagram of the amplifier:
Click the image to open in full size.
following clues I find the problem, the transistor Q208. KEM Part C3198, which is leaking.

This leaking part cause variation of feeding of Operational Amplifiers, activating the protection (see 16 and voltages on pin 3 of PWM) and sending DC to the audio output ....

When I remove it, everything returned to normal, now just put a new one.
Here is a bit difficult to get parts KEM.
Is there somewhere to help us with their equivalents?

Thank you very much everyone for your comments and help

Last edited by Solosound; 26th July 2012 at 12:41 AM.
  Reply With Quote
Old 26th July 2012, 07:38 AM   #4
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
That's just a generic schematic. It's the basic circuit used by many of the budget amplifiers (with slight variations). If you look at item 33 on the power supply troubleshooting page, there are several links to schematics for common circuits. Each one lists indicators that help you identify the type of circuit.

The part isn't going to be critical. Virtually any NPN transistor with the same pin configuration and greater or equal voltage/current ratings will work.
  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
anyone have soundstream reference picasso schematic clear version russdeanlee Car Audio 4 30th March 2012 07:29 AM
soundstream reference picasso russdeanlee Car Audio 6 18th February 2012 08:40 PM
soundstream picasso class a amp question russdeanlee Car Audio 4 24th December 2011 07:15 PM
Soundstream PCA2.760 mike49504 Car Audio 2 11th June 2011 04:13 AM
Soundstream Picasso 1.1700D mike49504 Car Audio 1 2nd November 2010 09:56 PM


New To Site? Need Help?

All times are GMT. The time now is 03:00 AM.


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