ProGram wrote:

Did you renew the pinch roller? Often they get spherical and cannot work evenly.

My first thought too.
Clean tape path, capstan, pressure roller, heads etc.?
Good quality tapes?
And did you fit correct belts or some cheap stuff from China or Portugal? A motor overload can cause this too.

Martin

the pinch roller seems to be "normal" i don't change it, 

I test with 4 tapes and i test with an other player, tapes works

I take belts from china

Correct spare parts for Bang & Olufsen from China?  Ehh....
The (toy-) belts sold there and in large numbers on Ebay are usually nothing but standard sizes and typically far too tight.
If your motor bearings aren't already worn out from a too high sideways pull (it happens fast with the delicate sinter bronze bearings), I suggest you grab a set of correct belts (beoparts-shop.com) and try again. If the motor has suffered, I may be able to find a good original replacement. 

Sorry, but I have seen this hundreds of times with all kinds of different outcomes.
Read more here: /forum/imported-unmapped/excerpts-from-the-passing-week - actually, a case similar to yours is also found there.

Martin 

Ok thanks a lot for answers. 
i will see it when i have more time.  

in fact i have a little variation of volt at the motor.

my normal measure at the motor is 13,81 - 13,83 Volt (sound is ok)

sometimes the volt down to 13,68 - 13,75 for 1 seconds , it's when the sound become strange (a little slow)

I make some tests and measure and i am asking me if 13,8V is normal because it's indicated 14,3V

the transistor TR4 is ok ? or maybe he is a little too old ?

I check C1 / c2 / c3 / R3 / r4 / r5 / r6 / r7 / r9

I change c4 / c5 / c6 / c208 / C408 and R2 / R8

thanks a lot

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13.8V is a little low, but should be OK for the motor, - but it should run stabile and the voltage shouldn't drift like this.

Sounds like the motor is (or has been) running rough, (over-)loading the power supply.
Wrong belts?... 

Has R8 burned? That would be a clear sign of overloading (ref. the mentioning of this exact component in the link in my post above).

I suggest you replace R8 (note: it's a safety component, must only be replaced with a similar type), fit known correct belts (Beoparts-shop) and lubricate the motor bearings - if not already to late.
If the motor has been damaged PM me or ask at Beoparts for a replacement, - R8 too and any other part you may need.

Martin

Hi Martin thanks a lot for your answer.

Yes R8 has burned and i replace it by same caracteristic 

Before change motor and belt... even if i am not really sure to do this. Because i don't really need to play audio tape, i just like to have something who works fine :) and actually it's work but not totally fine :p

How can "lubricate the motor bearings" ?

Thanks for your time

Where to get a belts set for Beocord 2000 tape recorder ?????

Vytautas