Arcam Alpha 5 Plus CD Player. - diyAudio
Go Back   Home > Forums > Source & Line > Digital Source

Digital Source Digital Players and Recorders: CD , SACD , Tape, Memory Card, 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
Reply
 
Thread Tools Search this Thread
Old 16th May 2005, 05:23 PM   #1
Umberto is offline Umberto  United Kingdom
diyAudio Member
 
Join Date: May 2005
Location: uk
Default Arcam Alpha 5 Plus CD Player.

Please Help.

I have distorted audio output when playing my CD's, i've checked the lazer to see if it was dirty and it seems to be ok. After some further investigation I've also manged to check the +/- 25ve rail and they both seem to be ok. I susupect it's a problem with the D-A circuit.
Has anyone experienced the same fault?
  Reply With Quote
Old 16th May 2005, 06:54 PM   #2
tubenut is offline tubenut  South Africa
diyAudio Member
 
tubenut's Avatar
 
Join Date: Nov 2002
Location: South Africa, Jhb
Check all PSUs... But, it can be a dodgy DAC chip, on the Arcam 5 it is permanently powered up btw and I have seen 2 players with a faulty DAC. Gets worse the longer you play. After an hour or 2 of rest it seems ok again..
  Reply With Quote
Old 17th May 2005, 08:48 AM   #3
Umberto is offline Umberto  United Kingdom
diyAudio Member
 
Join Date: May 2005
Location: uk
Default DAC Chip. (Arcam 5 CD Player)

Thanks for your reply mate, which IC is it? I don't have a manual i'm affraid.
  Reply With Quote
Old 17th May 2005, 09:09 AM   #4
diyAudio Moderator
 
pinkmouse's Avatar
 
Join Date: Apr 2002
Location: Chatham, England
Umberto, email Arcam customer support for a service manual, they are very helpful, and usually mail a pdf back within a day or so.
__________________
Rick: Oh Cliff / Sometimes it must be difficult not to feel as if / You really are a cliff / when fascists keep trying to push you over it! / Are they the lemmings / Or are you, Cliff? / Or are you Cliff?
  Reply With Quote
Old 17th May 2005, 12:10 PM   #5
Franz G is offline Franz G  Switzerland
diyAudio Member
 
Franz G's Avatar
 
Join Date: Jun 2004
Location: Bern / Switzerland
Umberto

I have here the complete boards out of an Arcam 5 player. The only fault: main tranny burned and no transport.

I got it to scavenge and to build my own external DAC...

So, what seems most suspect on this board, what I would check in your case: the two nonpolar 100uF caps near the output jacks on the smaller board. They sit fully in the signal path and they could be aged.

Should you receive a service manual, could you send it to me per mail? (franz.gysi@tiscalinet.ch, please subject "Arcam" or something like this (Spamfilter).

Should you not succed with the reparation, I could offer you my boards, but take it as your second chance

Kind regards
Franz

/Edit: I realized to late: my boards are not from the plus version and I don't know about the differences. I am very sorry! But I am quite sure, you will find the two grey caps, I mentioned. Check them!
  Reply With Quote
Old 17th May 2005, 05:40 PM   #6
Franz G is offline Franz G  Switzerland
diyAudio Member
 
Franz G's Avatar
 
Join Date: Jun 2004
Location: Bern / Switzerland
Boahh, I already got a service manual!

Many thanks, Martijn!

Franz
  Reply With Quote
Old 17th May 2005, 06:43 PM   #7
Franz G is offline Franz G  Switzerland
diyAudio Member
 
Franz G's Avatar
 
Join Date: Jun 2004
Location: Bern / Switzerland
Umberto

Here a picture of the DAC/Audio Board showing the mentioned caps (red arrows).

After looking at the schematics, this is the most possible reason for your problem!

After isolating the problem (you can try a lower value than 100uF, possibly loosing some bass, but the distortion should disappear), you could check, if the attached device (pre- or integrated amp) has some input caps.

If yes, you dont need the output caps in the player and you can replace them by a wire.

In this case, I may suggest you also to remove the output mute transistors (Q2/Q102) and the output resistors (R14/R114). See blue arrows.
Attached Images
File Type: jpg arcam_alpha_5_dac_audio_board.jpg (61.7 KB, 611 views)
  Reply With Quote
Old 17th May 2005, 08:37 PM   #8
tubenut is offline tubenut  South Africa
diyAudio Member
 
tubenut's Avatar
 
Join Date: Nov 2002
Location: South Africa, Jhb
The DAC chip is the TDA1541A...
  Reply With Quote
Old 17th May 2005, 08:46 PM   #9
diyAudio Moderator Emeritus
 
jean-paul's Avatar
 
Join Date: Sep 2002
Location: Germany
Big chance it is the one causing the distortion......
__________________
It's only audio. Official member of the Norske Brillegeit Gang.
  Reply With Quote
Old 18th May 2005, 11:09 AM   #10
Umberto is offline Umberto  United Kingdom
diyAudio Member
 
Join Date: May 2005
Location: uk
Default Arcam CD Player

Thanks guys for all your help so far I will keep you posted.
  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
Arcam alpha plus cd player help Scrappydoo Digital Source 29 1st March 2010 07:31 AM
spare part Arcam Alpha 5 cd player paul_g Digital Source 7 3rd September 2006 09:06 AM
Arcam Alpha 5 cd player paul_g Digital Source 5 21st December 2005 10:55 PM
Anyone installed a TentLabs XO on an Arcam Alpha 5 Plus Player dewdrop Digital Source 13 29th March 2004 06:18 PM
Arcam Alpha 5 CD Player paulcurrie Digital Source 0 31st January 2004 12:47 PM


New To Site? Need Help?

All times are GMT. The time now is 12:43 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