Rejuvenating+moding Grundig CD-9000 - Page 2

djacco · 8th May 2010, 10:25 PM

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...

lor.e.s · 9th May 2010, 04:56 PM

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

djacco · 14th February 2013, 03:24 PM

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 ?

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8th May 2010, 10:25 PM	#11
djacco 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...

9th May 2010, 04:56 PM	#12
lor.e.s 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

14th February 2013, 03:24 PM	#13
djacco 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 ?