Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Digital Source Digital Players and Recorders: CD , SACD , Tape, Memory Card, etc.

Audio Alchemy DDS-PRO Transport
Audio Alchemy DDS-PRO Transport
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 13th April 2012, 08:04 AM   #21
regal is offline regal  United States
diyAudio Member
 
Join Date: Jan 2004
Location: MD
The AA I2S has either the wordclock or the bitclock inverted from phillips spec, I forgot which. I am also a fan of the AA DDE DAC's sound, the PMD100-AD1862 combo is a winner. One review I read years ago found that the i2s input had higher jitter than anything they had meaured, if you look at the schematic it goes thru a ton of glue ic's I guess because I2s wasn't meant for long distance.

I'm considering trying iancanadas fifo i2s to the AA DDE, but what AA did with the I2s inside the DDE is so confusing. I've got the schematics for both the v3.0 and v2.1 if anyone is interested. My gut is that a short direct I2s from a fifo or the waveio removing the unnecessary input section and one could have a big upgrade over the dti/transport i2s.

Also Colin Toole had a sectret I/V board project to upgrade these DAC's a few years ago.
  Reply With Quote
Old 24th April 2012, 04:30 PM   #22
marko1 is offline marko1  Slovenia
diyAudio Member
 
Join Date: Jan 2010
Location: Ljubljana
Hi, I need help with my dear DDS Pro ! So far its great transport up today ! I turn it on today and its not working ? One month was resting and today I was nicely surprised ! He shows on the screen power but it wont take any commands. Aider from remote or on the DDS Pro !?????
I have switch it off and on many times, same result not working. Only difference is that every time I switch on it shows different digits on screen !??? Looks like it went MAD !!!???? Dose any one have experienced something similar ??? I'm desperate !
Thanks
  Reply With Quote
Old 24th April 2012, 04:55 PM   #23
SoNic_real_one is offline SoNic_real_one  United States
diyAudio Member
 
Join Date: Jan 2008
Location: Virginia
The reset capacitor probably got dry and now doesn't have enough time to reset properly.
Keep it plugged and turned on, some times the electrolytic capacitors will regenerate their insolation under nominal voltage. If still is not working, needs te be replaced.
  Reply With Quote
Old 24th April 2012, 05:18 PM   #24
marko1 is offline marko1  Slovenia
diyAudio Member
 
Join Date: Jan 2010
Location: Ljubljana
SoNic_real_one,

Thanks for a advise ! I did keep transport on, maybe not long enough ! I will do it again and see what will happen ! Even if I need to replace the capacitor its great as long is not something more complicated. I really, really hope that's all. I was concerned that is some control chip !!! Other wise I change all power supply capacitors, rise each to 10.000uF and bridged with mkp Vishay. Screen was deem before that. After upgrade shines like hell ! More energy show nice sonic improvement too !
Do you now by any chance where is placed RESET CAPACITOR ?
  Reply With Quote
Old 24th April 2012, 05:20 PM   #25
stephensank is offline stephensank  United States
diyAudio Member
 
Join Date: Oct 2006
Quote:
Originally Posted by marko1 View Post
Hi, I need help with my dear DDS Pro ! So far its great transport up today ! I turn it on today and its not working ? One month was resting and today I was nicely surprised ! He shows on the screen power but it wont take any commands. Aider from remote or on the DDS Pro !?????
I have switch it off and on many times, same result not working. Only difference is that every time I switch on it shows different digits on screen !??? Looks like it went MAD !!!???? Dose any one have experienced something similar ??? I'm desperate !
Thanks
I have been repairing a lot of DDS-Pro's in the last year. It seems that the majority of these were built with a number of caps installed on the clock/power board that are rated 16V, but are fed a continuous 24V, and they are now rapidly dying, sometimes causing severe overheating to the point of making resistors in the regulator circuits flame out & damage the stock servo board above it. The only reason these 16V caps have lasted this long is that they were Nichicons. This is your problem, with virtually no doubt at all. If you have the skill to do the work yourself, and it involves desoldering a double-side board with plate-through holes, so not easy, then PM me, and I will go through the schematic & write you a list of the caps to replace & with what to replace them.
  Reply With Quote
Old 24th April 2012, 05:37 PM   #26
marko1 is offline marko1  Slovenia
diyAudio Member
 
Join Date: Jan 2010
Location: Ljubljana
stephensank

Thats great to now. I fill much better now. I do and I did some soldering work before. Im not professional but I can do it. Its obvious that caps need to be changed with the higher value !
More uF and more voltage for sure! I have seen inside DDS Pro some green non polar Nichicons. So far I have great experience with Nichicons and I love them. Especially KZ !
By the way my DDS Pro is near 30 years old ! So I guess it was just question of time (minute) which capacitor will go first. I will take your suggestion seriously and change all
capacitors inside ! Its about the time to do it !
  Reply With Quote
Old 24th April 2012, 10:28 PM   #27
SoNic_real_one is offline SoNic_real_one  United States
diyAudio Member
 
Join Date: Jan 2008
Location: Virginia
Probably you are safer replacing all the electrolythic capacitors. If they are still "good", probably they have reduced capacity with all what derives from there.
I don't have the schematic of your DDS Pro, usually the reset capacitor is a 1-10uF in close proximity to the CPU that controlls the diplay, keys... maybe is a general use CPU like 87C51. Or a 74HC04 close by the same CPU...

Last edited by SoNic_real_one; 24th April 2012 at 10:33 PM.
  Reply With Quote
Old 24th April 2012, 10:56 PM   #28
marko1 is offline marko1  Slovenia
diyAudio Member
 
Join Date: Jan 2010
Location: Ljubljana
Quote:
Originally Posted by SoNic_real_one View Post
Probably you are safer replacing all the electrolythic capacitors. If they are still "good", probably they have reduced capacity with all what derives from there.
I don't have the schematic of your DDS Pro, usually the reset capacitor is a 1-10uF in close proximity to the CPU that controlls the diplay, keys... maybe is a general use CPU like 87C51. Or a 74HC04 close by the same CPU...
Yes I will definitely ! Its the easiest and probably clever thing to do after near 30 years of use. After replacing with new and better quality caps sound will improve too for sure! I will look inside DDS Pro and gate back to you with results concerning reset capacitor. But any way I'm planing as you suggest me to change
all electrolytic capacitors ! Woow it must be a loot ! Thanks for the great help. Report will follow.
  Reply With Quote
Old 25th April 2012, 04:45 AM   #29
stephensank is offline stephensank  United States
diyAudio Member
 
Join Date: Oct 2006
SONIC- YOU DON'T KNOW THIS MACHINE! Why are you arguing with me, when I very obviously know this unit extremely well?
The fact that you, Marko, are seeing green Nichicon Muse caps confirms that yours is one of the many that unfortunately has 100uf/16V caps before & after every one of the 11 or so regulators, with nearly half of those on the input side of the regs seeing a continuous 23-24VDC. It is a testament to Nichicon that these are only just now dying with a full 50% overload voltage after nearly 20 years service. As I said before, if you PM or email me, I will go through the schematics & tell you exactly which caps will positively need replacement. When I service them, I simply replace all of the input-side caps on all regs with 470uf/25V Fine Gold Nichicons, then 220uf-1000uf/16V FG caps on the post-reg side, depending on whether or not the particular reg is doing a job that actually affects audible performance, which is only about a third of them. Most of the new caps have to be mounted laying down, to fit in the very narrow space available.
You DO NOT need to go looking for reset circuit caps or anything to do with display/syscon processor. Your problem is absolutely going to be simply a matter of replacing the dying 100uf/16v caps on the clock/supply board.

Last edited by stephensank; 25th April 2012 at 04:48 AM.
  Reply With Quote
Old 25th April 2012, 10:25 AM   #30
SoNic_real_one is offline SoNic_real_one  United States
diyAudio Member
 
Join Date: Jan 2008
Location: Virginia
I don't know the DAC but your claim is hard to belive, that's it.
They put 24VDC in capacitors rated for and regs that are supposed to output probably 9-12V? What regs are those? 7805 for 9-12V range has a max input 27V...
Maybe the transformers where the issue in your US models. Based on the fact that is a Pioneer PD-S703, did they used the one for Japan market (100V) in US (120V)?
He probably has the model for 230-240V (european market).

Last edited by SoNic_real_one; 25th April 2012 at 10:29 AM.
  Reply With Quote

Reply


Audio Alchemy DDS-PRO TransportHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
FS Audio Alchemy DDS II guts barbarous Swap Meet 5 2nd December 2010 08:04 PM
FS- Audio Alchemy DTI PRO 32 leadcoma Swap Meet 2 18th February 2009 03:53 PM
FS: Audio Alchemy DTI Pro w/ Power station 4 supply silica Swap Meet 0 2nd March 2008 08:19 AM
For Sale: Audio Alchemy DDS PRO Mainboard hifi Swap Meet 0 26th February 2004 12:19 PM
Audio Alchemy CD transport problems Russell Sit Digital Source 12 29th April 2003 08:48 AM


New To Site? Need Help?

All times are GMT. The time now is 06:39 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki