Just travelling on the seat of your car is enough to knock  the servo out of adjustment.

The method of adjustment is the same as all the 4000 series decks and can be found in the service manual which is available on this site.

You will need to get familiar with all the adjustments if you are to have a good relationship with your 4000

What do you mean by servo adjustment? I've read through the manual and can't identify which of the numerous adjustments you are referring to. Thanks a lot!

I've now opened the thing up and had a closer look. The motor stops entirely rotating as soon as the tone arm lowers.

Kai

I think the bulb has had it, or a solder somewhere along its feed. Can you see it glow in the dark?

Sorry, in the 4000 manual they call it the Diaphragm at the top of page 4-6. The sensitive adjustment is Screw B having loosened Screw C..

I can only speak from my own experience. This is the adjustment that has moved when I have supplied this type of deck through the courier system.

Of course Chartz could be correct and the bulb has gone altogether.

Which bulb are you talking about? The one in the sensor arm? This sounds interesting. When I first tried it, the lamp was completely out causing the tone arm not to lower. However, after cleaning and touching the thing, it suddenly went on again and the tone arm lowered as it should. However, there still is the problem that now the carriage doesn't move after the tone arm has lowered. Could that be caused by the light although the bulb in the sensor arm is on?

What I have also discovered: I followed tha advice from the manual and removed the drive belt. No matter how much I rotate the platter, the carriage doesn't move at all which it's apperently supposed to.

Any ideas?

Greetings,

Kai

As I suggested in my previous thread, have you checked the small belt that drives the arms along the track?

If this is worn or slipping, or not aligned properly, the arms will not move across.

So then, do you see the diaphragm bulb glow or not? To see it, remove the top plate and the platter. Just to make sure, verify that there is voltage at its legs. 

Sorry for asking but which one is the diaphragm bulb? The only bulb on the inside that I can see glow is the orange/red one next to the mirror.

I've changed th small belt with a new one I still had but nothing changes. So it's definitely not the belt.

Kai

That is the strobe light.

The diaphragm light is next to the arm pillar. The bulb is enclosed in a dark box so it is a bit difficult to see it. 

Ok, so it's not  the belt.

The orange bulb is the neon for the strobe: the bulb chartz is talking about is at the back and not obvious as it's under a black cover. However, you should still be able to see it, assuming it is working!

You will need to pull off the cover to access it, if it needs replacing.