Dillen wrote:

The last 4-5 mm or so up to the lead-in groove is travelled at a lower voltage (slower speed) and the
tonearm is not lowered until the correct number of pulses from the threaded shaft opto has been reached.
My theory is that the servo motor hasn't got enough power to do this with the lower voltage. This is usually caused
by dust and dirt (or wrong lubrication) on the threaded shaft and carriage nylon bushing and/or a too tight servo belt.
Can you measure if the servo motor has any DC voltage across it when the tonearm hovers like this ?

Another thing is the adjustments for the << and >> buttons.
DC voltages are mentioned in the service manual, worth checking!

Martin

Okay, so back to the bench with the Beogram.  I measured the DC voltage at pins 1 and 2 of P1 of the main board.  That is for the arm motor.
I get the following measurements -
Stby : 0v
Play : -7.4v until it stops and plays, then -0.3v (arm down)
Play (when the problem causes it to stop short) : -7.4v, then it stops and drops to -0.06v (arm up)
Note: That is because the arm doesn't try to drop into play mode. It is still in the raised position.

Arm Raised
Stop : 7.1vForward  : -3.6 to -4v
Fast Forward  : -7.6v
Reverse  : +3.6v
Fast Reverse : +6.6v

On the << and >> adjustment in the service manual, all I found was this procedure. 

Does the manual want the voltage measurement between P5-4 and P5-6 or the voltage measurements from -

P5-4 to P5-3 (gnd)
and
P5-6 to P5-3 (gnd)

I am guessing it is P5-4 to 3 for one adjustment screw
and
P5-6 to 3 for the other

Here is the P5-6 to P5-3 measurement after my adjustment

Good news this morning.  The first thing I did was pop on a record and press play.  The Beogram went perfectly to the set down position and began playing.  A few hours later and I repeated the test again with the same, good result.  So far so good.  I have the Beogram reconnected to the Beomaster 6000 system and will continue using it for a while.  If nothing else happens, I should be able to give this system back to its owner. I enjoyed this repair as I was able to gain some more valuable information on restoring these turntables.  I have a couple more 8002 decks waiting for me and one 8000 so I will see what issues they have and post anything this thread hasn't covered.

As said, good news!

Yes indeed. I would like to thank Martin again for sourcing parts and sharing his repair experience. I really appreciate it.

It's Phil, and I'm connecting some dots.

I hadn't seen this thread until your link to it about the grounding spring on Rajod's 8002 thread. And I bet I know you from VE and you have a PX-2 Yamaha as well? And we both nibbled on a PX-1 that left a bitter taste in my mouth? You're in Oregon? I'm in NJ

How can I get either a printed or digital copy that you mention here? I am going over my VE printed copy which resembles the Beo copy (in that much is illegible or barely so) and copying from yours some of the "cues"

And, I haven't completely read through all, but I bet it's in the processor can! I was just coaching Rajod to set up an 8002 "test bench" so he could substitute known good parts and verify things. Seems every time i go on a wild goose chase, it's the processor.

And, I am awed by your diagnostic skills and determination! These threads remind me of the two 8002s and one 8000 I should finish up and sell!

This IS a great read!! I'm up to pg 13 now.

Pg13/Dillen: 

"The Beogram 6006 and 8000 CPUs are interchangable.
The 8002 is not.
Apparent differences are that it supports the two little arrows on the sensor arm and it has
a different coding to support multiple play repeats but there are other things too."Don't expect it to work and - to be on the safe side - don't do it. Those CPUs are quite sensitive and not too plentiful."

I have swapped an 8000 processor can into an 8002 and, except for losing the multi play and pause differences, all has been good for years (after reflow and recap including processor) I sold it recently; perhaps the arrows in the sensor arm didn't light-I don't recall, but expect I would have noticed. I do believe that one CPU leaves the arm parked/paused for a good while, then returns it to the garage and shuts off; pressing play re-starts it and it goes back to the point it was paused at and drops there-nice! And I think the other just remains paused a long time, then shuts off?? But am not certain-maybe it pauses forever?

I have not had the courage to swap the 40pin micro-controller from 8000 can to 8002 can..... But I'd love somebody to do so and report.