Rejuvenating+moding Grundig CD-9000 - Page 2 - 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 8th May 2010, 11:25 PM   #11
djacco is offline djacco  Netherlands
diyAudio Member
 
Join Date: May 2010
I see this is an old thread but I like some information on this player. I bought one which is broken and just found out why. There's a couple of smd resistors missing !!! (part numbers R3395 - R3396 on the back of the board right behind part 6312) I tried to find these in the service manual I got from the web but can not find these parts ... who can help me identify these resistors so I can use my player again...
  Reply With Quote
Old 9th May 2010, 05:56 PM   #12
lor.e.s is offline lor.e.s  Norway
diyAudio Member
 
Join Date: Feb 2009
Hello dejacco.

You find these resistors if you look at the PCB layout.
Studying the schematics you will discover that part nr.6312 ( headphone amp njm4560) is not in use. The signal is routed to a separat headphone board contaning amplifier RC4556. Output from njm4560 is cut by removing/omitting resistors R3395 and R3396.

The mainboard (with njm4560) is probably also used in other cd-players with only a fixed headphone output. Thus the option to add output resistors R3395 and R3396 (often 150ohm).

Some experienced members could probably lead you through some faultfinding, and to do that they will need more info from you.

Regards
  Reply With Quote
Old 14th February 2013, 04:24 PM   #13
djacco is offline djacco  Netherlands
diyAudio Member
 
Join Date: May 2010
Hello I have not come to repair my player yet, it has a hum when playing cd's which sounds like a ground problem but I can figure out where to start to fix this. Is there someone who has had a similar problem ?
  Reply With Quote
Old 14th February 2014, 01:07 AM   #14
diyAudio Member
 
hifisucks's Avatar
 
Join Date: Apr 2009
Location: Germany,17039 Wulkenzin OT Neuendorf
Still have your hum problem? I solved mine changing two voltage regulators: 7815 and 7915...! Have fun!
  Reply With Quote
Old 14th February 2014, 08:17 AM   #15
djacco is offline djacco  Netherlands
diyAudio Member
 
Join Date: May 2010
Default grundig cd 9000

Quote:
Originally Posted by hifisucks View Post
Still have your hum problem? I solved mine changing two voltage regulators: 7815 and 7915...! Have fun!
Thanks for the reply, I haven't had time to fix but I will check out your solution. Can you maybe point out where these component are located? (a picture would be fantastic )
  Reply With Quote
Old 18th March 2014, 03:05 PM   #16
diyAudio Member
 
Join Date: Feb 2013
What opamps did you use? If i replace those original opamp with let say OPA2132 then they should work or it needs some modifications?
  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
Grundig A-9000 broken :( mat_one Solid State 9 26th November 2008 03:01 PM
moding P Daniel's NOS DAC? cuibono Digital Source 2 7th February 2008 04:53 AM
Moding Sony CDP to non-OS? kiwi_brian Digital Source 3 11th September 2007 12:45 AM
Moding Car Amp Superblunt Car Audio 1 23rd April 2005 07:38 PM
Is it worth moding? SteveG Digital Source 14 15th March 2002 08:08 AM


New To Site? Need Help?

All times are GMT. The time now is 08:55 AM.


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