Please select To the mobile version | Continue to access the desktop computer version

Kaosun's CD Players

 Forgot password?
 Repair!
Search
View: 10238|Reply: 6

Reviving Sony D-90

[Copy link]

20

Threads

85

Posts

978

Credits

Senior Member

Rank: 4

Credits
978
Post time 2015-11-17 17:23:57 | Show all posts |Read mode
I got so excited by kaosun writeup on Toshiba player that, for this once, have decided to calibrate my D-90 the way it should be done. Borrowed the 'scope from the lab but no matter what I do, I just cannot get anything better than blurred and totally non-cynced image. CD plays beautifully, so I am running out of ideas... Disclaimer: I have never used these newer scopes in my life
Any thoughts?


This post contains more resources

You have to Login for download or view attachment(s). No Account? Register

x
Reply

Use magic Report

625

Threads

988

Posts

5915

Credits

Administrator

Rank: 9Rank: 9Rank: 9

Credits
5915
Post time 2015-11-18 20:19:23 | Show all posts
1: It seems your RF amplitude is 0.75Vp-p is right. Be aware of the Rf for CDR is 0.8Vp-p and 1.2Vp-p for commercial CDs. You can adjust the oscilloscope to align the pattern at the middle of the screen and make it larger.

2: Be sure to replace all the DIP capacitors whatever they're good or not. Furthermore, clean the PCB after removing the capacitors.

3: Follow the service manual to ensure the several voltage points have correct measurement and adjustment. Also, adjust TB and FB to make the RF big and clean enough. TG, FG and VCO are not needed to adjust. If necessary, adjust laser power VR on the iotical head to ensure the RF meets the requirement of 0.8/1.2Vp-p.

4: Lubrication mechanical parts and volume resistor are also necessary.

Good luck!
Reply Support Not support

Use magic Report

20

Threads

85

Posts

978

Credits

Senior Member

Rank: 4

Credits
978
 Author| Post time 2015-11-19 21:44:32 | Show all posts
Good folks at DIYaudio said that digital scope is a bad idea for getting an eye-pattern, that analogue scope should be used. I am still waiting for someone to send me the minimal specs for a digital scope for doing this but it seems that those in the know do not bother with such easy questions.
Meanwhile I found the option which is set as "default-ON" on my HP, it is called "Vectors ON/OFF" and once I set it to OFF the picture got recognizable as an eye-pattern.
I guess by DIP caps you meant SMD electrolytics? because they all gone bad
Reply Support Not support

Use magic Report

625

Threads

988

Posts

5915

Credits

Administrator

Rank: 9Rank: 9Rank: 9

Credits
5915
Post time 2015-11-28 23:08:14 | Show all posts
serge1996 2015-11-19 21:44
Good folks at DIYaudio said that digital scope is a bad idea for getting an eye-pattern, that analog ...

Yep, all DIP caps should be replaced whether or not they're working. It doesn't have too many SMD caps, maybe 3? replacing all would be the best.  

Yep again, never use a digital oscilloscope to observe an eye pattern. I tried several but none suitable for eye pattern. Don't know too  much about that. I'm using a Tektronix 2246 4*100M analog oscilloscope which works perfect for me.  
Reply Support Not support

Use magic Report

625

Threads

988

Posts

5915

Credits

Administrator

Rank: 9Rank: 9Rank: 9

Credits
5915
Post time 2015-11-28 23:17:25 | Show all posts
Your Vector on/off I though maybe something like trigger in Tektronix. Because the wave is dynamic, you have to set a trigger to capture the wave inside a window to display it. I might be wrong but pls refer to the operational manual.
Reply Support Not support

Use magic Report

20

Threads

85

Posts

978

Credits

Senior Member

Rank: 4

Credits
978
 Author| Post time 2015-11-29 18:25:22 | Show all posts
With vectors OFF it gives me an eye-pattern,... kinda... so I will continue using it for now... So far my success rate with D-90 restoration is three out of three fixed , thank you Master Gu for the inspiration!!! At some point I will have to sell some of them to recuperate the costs of this new hobby of mine. But first I am going to use my fine-scale-modelling skills to paint 'em in some unique colours, just for the heck of it
Modelling hobby is more rewarding, but this PCDP restoration is definitely more challenging, exactly what I need now.
Reply Support Not support

Use magic Report

625

Threads

988

Posts

5915

Credits

Administrator

Rank: 9Rank: 9Rank: 9

Credits
5915
Post time 2015-12-18 14:37:52 | Show all posts
Reply

Use magic Report

You have to log in before you can reply Login | Repair!

Points Rules

Archiver|Mobile|Dark room|Kaosun's CD players

2024-03-29 00:20 GMT-6 , Processed in 0.042536 second(s), 21 queries .

Powered by Discuz! X3.4

Copyright © 2001-2020, Tencent Cloud.

Quick Reply To Top Return to the list