Soundstream Ref.405 turn-off pop only in subchannel - 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 29th June 2010, 02:54 PM   #1
diyAudio Member
 
gisewhcs's Avatar
 
Join Date: Sep 2007
Default Soundstream Ref.405 turn-off pop only in subchannel

Because I can't change the topic, I started this new threat.
It somehow starts here: Soundstream Ref.405 railvoltage at sub-ch.

The Problem is described there, I have a Ref.405 with a turn-off pop only in the subchannel.
Bad chassis ground or the radio can't be the problem, as I already tested another radio and checked the ground connections.
I read something about a relais in an old threat about a MC245 and Perry said there was something similar in an threat about a Ref.705, but I can't find that one!

I hope somebody already had similar problem with a Ref. amp and can offer some tricks.
  Reply With Quote
Old 29th June 2010, 03:03 PM   #2
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
It was probably the MC245 that I was thinking about. Too many amps... too few working brain cells.

Does it pop with no signal input?

Does it pop no matter the position of the various switches?

What is the DC offset before and after the pop?

Do any of the op-amps in the sub channel have any significant DC offset (more than a few millivolts)?
  Reply With Quote
Old 29th June 2010, 03:35 PM   #3
diyAudio Member
 
gisewhcs's Avatar
 
Join Date: Sep 2007
I will test the things you mentioned in the next days.
I will have to take the amp out of my girlfriends car first.
And I believe she will not be very happy without music...

But I don't believe that it will be caused by one of the switches,
because I set the subchannel now to fullrange (active x-over in HU) and it got it's own input, it's no longer daisy-chained from the other inputs.
That were all switches in the subchannel, right?

I had another closer look at the schematic, and saw a 100F/16V cap right in the input for the subchannel,
if this one dried out/shorted itself, whatever, could that be the culprit?

And do you know the value of the mini-el-cap on the FEB?
The schematic lists a 100F/16V cap somewhere there, but I don't believe that such a small cap will have 100F.
  Reply With Quote
Old 29th June 2010, 05:47 PM   #4
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
There is a 10uF on the FEB board. The 100uF is on the main board.

I asked about the switches because, often, the switches will rout signals through other op-amps and if the noise is only in one position, it can help you narrow down the problem.
  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
Soundstream Ref.405 railvoltage at sub-ch. gisewhcs Car Audio 4 24th June 2010 07:43 AM
SAE 2400 turn on/turn off pop Glen B Solid State 16 31st July 2006 01:32 AM


New To Site? Need Help?

All times are GMT. The time now is 03:48 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