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Mine starts,  shuts off after a half second. The right reel never rotates, while the left will feed it tape momentarily.  Do we still say that, that is belts.  I was told the clutch has a broken plastic part. Looking under the cassette tray, without reoving anything, I can see nothing broken.

Will the right reel rotate at wind/rewind ?
If not, it will need some servicing. The reels are lubricated with a thin grease, or at least
it was quite thin when applied, it dries in and hardens over the years, making the reel rotate less willingly.
It can also be a brake fault but that is rare, unless the deck was taken apart and put together the wrong way. The brake
system is not particularly easy to put together. You have to hold s couple of arms and levers in place while assembling.

I can supply new belts if needed but a frozen right reel does not necessarily mean bad belts.
The deck stops because it can't feel the tape running when the right reel is frozen, just as at tape end.

Martin

Hello,

The possibilities are many. Martin is of course right.

I've repaired four of these units, so I have seen different problems arise, and often a combination of them!

First of all, if the belts are present (!) a PSU problem can prevent the motor from being fed at all. For me, the 7915 regulator was defective.

Then, yes, the clutch (12135) will probably be bad, with a cracked bearing housing. This allow the sintered bronze bearings to slide inside the housing and this can cause many problems, because the pulley will rub on the housing hence creating a braking effect, itself the cause of a blown fuse (on some versions) or the aforementioned poor 7915 failure...

On the four Beocords I repaired it was cracked. This is fixable, but you will be careful to have the sintered bearings slightly out, I'd say by 0.2 mm.

Then many capacitors (the red ERO ones) will have to be replaced because they will be partly shorted, thus creating all sorts of strange behaviours.

The motor could of course be defective—was it noisy prior to failure?

By the way, web43 never came back to report... I find it sad that some won't bother posting when their problem is solved. That's just NOT how it works here!

I really appreciate the information.  Yes, the tape will wind and rewind, so the right wheel is not frozen. When you rewind, the tape counter blinks on and off with 4 small case letter c's  illuminating,.  Small case being only the lower half of the display ( cccc ).   When you fast forward, it blinks 4 backward small case letter c's.   When you stop it after a wind or rewind, the display is all 0's except the first digit is small case letter c that blinks and alternates between a and forward and backward letter c.  Turn the unit off then back on and the display reads 0's.
 
All of the leds appear to work, as, when you press any of keypad numbers, the counter  appears to display the various numbers as normal. 

I also have a BC8004. Can it donor mechanical mechanisms to the BC9000. 

I just turned Gold, so I will be looking at manuals

Thanks