Problem cd-304 MKII

[pisky]

Hi,
I have problem with my friend's cd-player.
He has a philips cd-304 mkII and when I push Play the CD start but after 2 second it stop. Evrytime when I push Play, the cd start for 2 second and after that it stop.
What's append?

 

[poynton]

hi, What does the display say?
andy

 

[pisky]

On the display, when the discis moving I read 00, when it stp nothing..... only the number of track, but not the real track on the CD, evry led of track from 1 to 20 are on.

 

[pisky]

I have open it, and the problem is that the laser arm does not move. For these reason after 2 second the disc is stopped.
Now, how I can resolv these problem?
Somebody have the service manual?

Bye

 

[poynton]

Hi,
When you say 'doesnt move' - do you mean stuck fast / jammed? or you saw no movement?
Andy

 

[pisky]

No movement, but the arm is not jammed.
Usually I know when you turn on the player, the arm go to the begin, read the cd and then the palyer is ready for play the CD.
In this case no, if I move the arm in the middle and then I turn on the cd-player, the arm remains in the middle

 

[poynton]

Hi,

Service manual is available via EBay from CAS Eur.10.95

I have found them very quick.

Early Philips cd players suffered from poor soldering on the ground plane which resulted in various faults. Look for what appear to be jumpers with a blob of solder on them. They connect through to the other side of the board. You need to solder a fine wire through the hole, soldering both sides. while you are at it, check for obvious dry joints.

If you can get hld of another cdm1 mechanism, eg from a cd104, you can check the tracking motor by substituting

Andy.

 

[pisky]

Ok, I have another CDM1 from cd-84, I can try to change but the connectors are a little bit different.
Tomorrow I will check all soldering.

Thanks

 

[pisky]

I have check all the weldings with no result.

 

[tony.garner]

Hi Pisky,

think here is a Philips 104 manual on UK ebay at the moment. should help.

 

[Extreme_Boky]

Hi,

You probably have faulty tracking servo / bad contact / solder joint.

Move the arm in the middle and then turn on the cd-player. Measure the tracking servo signal - it should be substantial - around 2 - 3V to allow for pickup assembly to move close to the center of the CD where TOC is. The CD spins which means that all the switches that have to be open / closed are okay ( T ).

And, check the ribbon cable connecting main PCB and mechanism. It looses connectivity with time - sometimes to a point where mechanism stops working.

Extreme_Boky

 

[pisky]

Measure the tracking servo signal - it should be substantial - around 2 - 3V to allow for pickup assembly to move close to the center of the CD where TOC is

Ok where exactly?

And, check the ribbon cable connecting main PCB and mechanism. It looses connectivity with time - sometimes to a point where mechanism stops working.

Ok I will check also this

Thanks

 

[Extreme_Boky]

There are usually 2 IC's in servo section. One does "calculation" of error, compares it with reference, and generates correction signal. The other is purely high current drive IC - basically low noise OP amplifier(s). There should be at least 3 servo signals going to the mechanism.

I can't tell you "where exactly" to measure servo signals without circuit diagram.

See if anyone on forums has it and is keen to e-mail you the diagram.

Regards,
Extreme_Boky

 

[pisky]

I have found the service manual only in german language.
Is there anybody that have the service manul in English? I can share a lot of service manual, include also marantz cd-94

Bye