Dear Friends,

My name is Frank and I live in Holland. One of my collections is 60ties and 70ties stereo. A few weeks ago I bought the 8000 series: Beomaster 8000, Beogram 8000, Beocord 9000 and Beovox MS150. The Beovox ( four new foam surrounds ) and the Beocord ( new belts and inside cleaning ) are working now.  The last two weeks I worked on the Beogram 8000. It did not work at all. I replaced all the capacitors and a number of the transistors ( TR18,19,20,21,29,30 ) IC3; D25,26; all the rectifier diodes. It has come to life a little: the 5 and 15 volts are working but the table spinning anti-clockwise and to fast; the arm does not move; the red light of the arm  is on and the display shows: 0000

Now I have come to the point, that I do not trust the transformer: T56.I will give You the data ( with the Begram plugged in ) :

P7-4 and P7-2: 5 volts AC

P7-1 and P7-7: 17 volts AC

P7-8:  0.7 volts AC

P7-5: 8 volts AC

P7-11: 30 volts AC

Is this any good?

A complication is that I do not have the right service manual: the main PCB is not the same as on the schematics. Mine is the one with the two mini- PCBs attached to the main PCB.

P4-4 reads 0.04V That can't be good?, because there are two zener diodes 47V (D37 and D38 ) The result is that P4-1 reads 8V AC  and P4-2 23V AC plus 5V DC; P4-3 is 30V AC.

Who can help me any further?

Greatings from Holland

Frank

Welcome to Beoworld !

Do you have the platter mounted ?
If not, the initial startup and braking sequence could easily see the
platter rotating backwards.

Is the display showing anything ?

Which transistors did you replace, with what and why did you replace them ?

Martin

Dear Martin and Members,

Thank you for the reply.

Yes I mounted the platter.

The display says 0.0.0.0.

I replaced: 0TR1; 0IC1; TR18; TR19; TR20; TR 21; TR29; TR30; IC3; D25 and D26.

Why? : because they are involved with the 5 and 15V and with the drive of the platter. And to make a start from not working to working.

But what is to say about the transformer?

Greatings

Frank

Hi Frank (and others), just a general piece of advice on this way of ''repairing'': replacing parts before finding the fault or establishing the problem is imho not a wise thing: if you replace a part with a replacement, or (accidentally) make a mistake the apparatus won't work still/again and you'll be lost with a possible double fault.

I'd advice always to locate and replace only the broken part first, make the apparatus work and if you feel the need, than start replacing things. (some people seem to see a point in just recapping anything they can...).

In this way you won't get lost...