Alpine 3527S Repair - Page 3 - 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 9th August 2010, 05:33 AM   #21
myk777 is offline myk777  United States
diyAudio Member
 
Join Date: Feb 2009
Quote:
Originally Posted by Perry Babin View Post
With no RCAs plugged in, what's the resistance from the RCA shield to the non-bridging speaker terminals?
In the MegaOhm range like 5 or 6 MOhms, seemed the same to all speaker terminals regardless of bridging ones or not.
  Reply With Quote
Old 9th August 2010, 05:44 AM   #22
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
I think that the resistance from the RCA input shield to the non-bridging terminals should be near 0 ohms. Is the resistance between all of the RCA shields near 0 ohms?
  Reply With Quote
Old 9th August 2010, 05:56 AM   #23
myk777 is offline myk777  United States
diyAudio Member
 
Join Date: Feb 2009
Quote:
Originally Posted by Perry Babin View Post
I think that the resistance from the RCA input shield to the non-bridging terminals should be near 0 ohms. Is the resistance between all of the RCA shields near 0 ohms?
No, they all seem seperated they're also in the MOhm range. The meter keeps changing in one direction when I measure them, same as when I measured between the shield and the speaker terminal almost like they are ramping up?

I think I'll pull the board out again and have a closer look at the back side again.

Mike
  Reply With Quote
Old 9th August 2010, 06:09 AM   #24
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Some Alpine amps have balanced inputs and some have a common shield ground. If none of the RCA shields are connected (0 ohms), then there shouldn't be a connection from the shield to the non-bridging speaker terminals.

The secondary center-tap of the power transformer should be directly connected to the non-bridging speaker terminals, no matter the input RCA shield configuration.

When you pull the board, look for cracks and bad solder connections.
  Reply With Quote
Old 9th August 2010, 07:42 PM   #25
myk777 is offline myk777  United States
diyAudio Member
 
Join Date: Feb 2009
Well, I've scoured the thing over and over and just can't find anything that looks wrong. I might just install that 330pf ceramic capacitor between B- and one of the speaker leads as it seems to fix the idle current issue and see what happens long term, other than that I'm out of ideas. Perry, you don't happen to have a schematic for this one or possibly one of its close siblings do you?
  Reply With Quote
Old 10th August 2010, 01:56 AM   #26
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
I have one for the 3550 which may be somewhat similar. Email me if you want it.

babin_perry@yahoo.com
  Reply With Quote
Old 17th August 2010, 06:36 AM   #27
myk777 is offline myk777  United States
diyAudio Member
 
Join Date: Feb 2009
Update:

Well, right or wrong I ended up soldering that 330pf cap in between the B- and one of the speaker output terminals, stuck the amp back in the truck and it's been working fine for the last week, sounds great as usual.
  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
Alpine CDA 7969R Repair JonFennell Car Audio 1 5th March 2010 11:18 PM
alpine mrp m650 repair candyman122 Car Audio 6 21st November 2009 09:18 AM
Alpine mrd-m501 Repair dj_square- Car Audio 2 31st August 2009 05:15 AM
Alpine CDA-7995 Repair Q. ACraig Car Audio 6 14th May 2009 01:57 PM
Old School Alpine repair Nismoron Car Audio 9 21st December 2008 12:38 AM


New To Site? Need Help?

All times are GMT. The time now is 11:00 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