That is a common behavior when there is something wrong with the Beocord. It senses a fault and immediately retracts. There could be a number of things that cause that. Most likely there is some physical blockage. Check that the brake pads on the reels (especially the one on the right) are correctly in place and there isn't one stuck where it is blocking the reel. Another possibility is the small metal clip that presses onto the cassette when the heads try to engage. Make sure it isn't bent where it can't clear the cassette housing.

Jesper Nielsen wrote:

Well, now I really need some input before I go Nuts.😕

I have this Beocord 8000 where the head clamp-in when pressing play but retracts immediately.

No FF or REW.

 

Belts are changed and all axels are cleaned and regreased with no positive result.

Changed PCB 4 (the one under the drive) with another (in fact two) which is known to work.

Changed the drive with one which is known to work.

Checked all connections and fuses (including the one under the keyboard)

 

So, I’m lost –I must have said something to the damn thing that it dislikes J

Does anyone have an idea.

Does the motor run in the damn thing?
If not, check the stupid fuse on the silly board underneath the annoying motor. 

Martin

Yes, its running silently like a charm 🤫🙂

Does the take-up reel (the right reel) run while playing?

Martin

It does not Play at all, it retracts at once - also with another drive installer.

/jesper

Check the solder joints for the large connector to the mech. section.
That's the one you plug the large white plug into.

Martin 

Will do, tomorrow - but I have tried with another PCB.

I'll be back :-)

/jesper

Checked all solderjoints on all connectors (resoldered)

Changed C4 and C8 on PCB4

Still the same;

When pressing Play it engages and then retract

When pressing FF or REW it makes one or two turns, then stops.

@sonavor: I have tried with 3 different mecs. all with the same behavior so it is most likely not a mechanical problem, but rather electronic.

/jesper

Could be that the Eject signal is too high, but you already replaced 4C8.
Check 4TR16

Martin