Marantz CD63 & CD67 mods list - Page 29 - 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 January 2006, 05:46 PM   #281
6h5c is offline 6h5c  Netherlands
One Seriously Addicted to Audio and Electronics
diyAudio Member
 
6h5c's Avatar
 
Join Date: Apr 2004
Location: Heerhugowaard
Yep. It's very, very faint. If shorting the zener is not enough you can replace the 7918 by a 7915 and experiment a bit with other zeners.

Ray.
__________________
Gonna buy my little girl a pink soldering-iron
The new DOS-CFP board is out!
  Reply With Quote
Old 16th January 2006, 05:48 PM   #282
diyAudio Member
 
Fidelity Audio's Avatar
 
Join Date: Dec 2005
Location: Doncaster England
The reg and zener root is defo the easiest way to do it.

I'll also look into the processor side of things.

I always have mine at the lowest setting.
  Reply With Quote
Old 16th January 2006, 05:52 PM   #283
6h5c is offline 6h5c  Netherlands
One Seriously Addicted to Audio and Electronics
diyAudio Member
 
6h5c's Avatar
 
Join Date: Apr 2004
Location: Heerhugowaard
Quote:
Originally posted by rowemeister
I always have mine at the lowest setting.
Well, then I guess a 7906 will be more than enough

Ray.
__________________
Gonna buy my little girl a pink soldering-iron
The new DOS-CFP board is out!
  Reply With Quote
Old 16th January 2006, 05:55 PM   #284
diyAudio Member
 
Fidelity Audio's Avatar
 
Join Date: Dec 2005
Location: Doncaster England
LOL yeah it should be.
  Reply With Quote
Old 16th January 2006, 06:32 PM   #285
poynton is offline poynton  United Kingdom
diyAudio Member
 
poynton's Avatar
 
Join Date: Mar 2005
Location: A life on the ocean waves when I'm not at home in N. Wales (but I'm not Welsh so no sheep jokes!)
Quote:
Originally posted by 6h5c
Hi,

The display is turned off instantly at power-off by means of Q852...854, otherwise you would see it fade to dark. The -20V Vftd is switched to the heater voltage by Q852. You can insert a small switch there, or drive one of the transistors. It won't get rid of the controllers drive signals though.

I shorted D852 to make the display less bright (I have a fairly new player, you can read a book near the display...). Before that I always used to dim it one step. It also prolongs the life of the display.

Regards,

Ray.


So VF1 and VF2 are heater supply
and VFTD is the -24v supply for the display.
I would break the track close to the uP QF01/pin64 and fit a spst push switch in the redundant headphone socket.

Now to update the to-do list!

Andy

ps did the attachments read OK?
  Reply With Quote
Old 17th January 2006, 07:24 AM   #286
diyAudio Member
 
Fidelity Audio's Avatar
 
Join Date: Dec 2005
Location: Doncaster England
Hi Andy

The attachments are very useful cheers
  Reply With Quote
Old 17th January 2006, 08:24 AM   #287
6h5c is offline 6h5c  Netherlands
One Seriously Addicted to Audio and Electronics
diyAudio Member
 
6h5c's Avatar
 
Join Date: Apr 2004
Location: Heerhugowaard
Hi Andy,

Thanks for the article. Everything received o.k.
Guess I could have saved the money for that common-mode choke....

Quote:

So VF1 and VF2 are heater supply and VFTD is the -24v supply for the display.
I would break the track close to the uP QF01/pin64 and fit a spst push switch in the redundant headphone socket.

Do you think that will work? I thought the outputs of the uP are switching to ground, because the cathode voltage Vftd is already supplied through the heaters. It's like a direct heated tube

Ray.
__________________
Gonna buy my little girl a pink soldering-iron
The new DOS-CFP board is out!
  Reply With Quote
Old 17th January 2006, 08:38 AM   #288
poynton is offline poynton  United Kingdom
diyAudio Member
 
poynton's Avatar
 
Join Date: Mar 2005
Location: A life on the ocean waves when I'm not at home in N. Wales (but I'm not Welsh so no sheep jokes!)
Hi.

In my case, the jury is still out - I think/ know better improvement can be made in other areas first.

Like snake oil, green cd ink, stabiliser rings, hard feet, soft feet or even the 'demagnetising cd' I mentioned above, some will find benefit (real or imagined) and some will not.

The problem with some/most of the improvements are that they are hard to do an A/B comparison and secondly, the improvement/degradation may be very small and subtle. I am getting older now and I know my hearing is going at the top end!

Andy
  Reply With Quote
Old 17th January 2006, 08:47 AM   #289
diyAudio Member
 
Fidelity Audio's Avatar
 
Join Date: Dec 2005
Location: Doncaster England
2 years ago at a Kenwood seminar I and one or two thers could hear this constant high pitched noise, it was barely noticable but there.

After about an hour one of the Kenwood guys said 'Can anyone hear a high pitched noise'. To which a few said yes.

He unvailed a signal generator wired to one of their amps and speakers. 20Khz. And I could hear it. Just!!!

Most people started to hear it when it dropped below 18Khz.

One bloke (about 62 years old) who we knew was a little bit deaf on the top frequancies could only hear up to 9.5Khz LOL
  Reply With Quote
Old 17th January 2006, 08:52 AM   #290
6h5c is offline 6h5c  Netherlands
One Seriously Addicted to Audio and Electronics
diyAudio Member
 
6h5c's Avatar
 
Join Date: Apr 2004
Location: Heerhugowaard
That's a real bummer for DIY'ers like us...
I'm trying to preserve my hearing as long as possible. Always use earplugs at concerts and drilling and things like that.

Ray.
__________________
Gonna buy my little girl a pink soldering-iron
The new DOS-CFP board is out!
  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



New To Site? Need Help?

All times are GMT. The time now is 01:01 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