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Beogram TX/6002 arm moving too slow

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citronix
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citronix posted on Fri, Oct 16 2015 10:12 AM

When I hit "play" everything works as intended, but the tangential arm itself is moving too slow , After playing 1/3 of a record, the pickup arm is angled towards the center og of the record, maybe 10 to 15 degrees!!!

I cann see, that the spindel itself (the one advancing the tone arm towards the center) is moving in small steps, maybe 1/3 to !/2 a revolution at a time - is that correct or should it be a contious motion?

All buttons on the interface are working correct, but sometimes, the arm takes an extra journiy from back and forth from the start to the end point of travel, when I hit "stop" - could the issues be related?

So far I have replaced both belts, cleaned/lubricated and adjusted everything around the tonearm acording to the service manual.

what am I missing?

 

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Dave Farr
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This sounds similar to this thread this week.  

http://forum.beoworld.org/forums/t/16819.aspx

Have you checked over the comments 'Dillen' makes on that thread?  If you have cleaned and adjusted everything else then these are worth investigating.  The step motion is normal as far as I'm aware as all my decks do the same.  If you use the 'Left' button, does the carriage move freely all the way to the centre?  Or, does it pause at about the same point you mention?  There may be a physical block to the carriage movement, rails not aligned, clip broken etc.

Dave.

citronix
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citronix replied on Fri, Oct 16 2015 10:48 AM

I have clened everything, and there is no bumps or dirt on the spindel - it would also have been my first thought. When pressing the left or right button the arm moves freely, without haning anywhere .

 

maybe the spindel is slighty bend? Then I need to know how to dismantle it?

 

Luckely I have an almost complete second deck for spares

Dave Farr
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If the carriage moves freely, then I suspect 'Dillens' thought on the detector/lamp is what to look at.

Dave.

citronix
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citronix replied on Fri, Oct 16 2015 11:13 AM

Sounds reasoanble - but what shall I look fore - the light is ON on the tone arm.

I suspect that LDR is short for Light Dependent Resistor - but thats as far as I get

 

Bad tracking, either the lamp or the LDR or both.

Dillen
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Dillen replied on Fri, Oct 16 2015 11:23 AM

Was the fault present before you replaced the servo motor belt ?

Martin

citronix
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citronix replied on Fri, Oct 16 2015 11:43 AM

I do not  know, the old belt was broken :-(

citronix
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citronix replied on Fri, Oct 16 2015 11:44 AM

I have opend the unit now, should there be visible light at the LDR? 

Dave Farr
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Where did you buy the new belt?

Dave.

citronix
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citronix replied on Fri, Oct 16 2015 11:51 AM

local - its not original, and as far as I remember its diameter is 100 mm and wit 1,8 mm - its rather tight - could that make a difference?

citronix
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citronix replied on Fri, Oct 16 2015 12:14 PM

further research has revield, that if I manually turn the tonearm towardss the center, (thaht is I push the tonearm all the way to the left, so it touches the other arm) the whole carriage is mooving too :-) Whitch must mean, that the motor gets its signal too late - now I only need to know how to adjust it.  :-)

anyone???

citronix
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citronix replied on Fri, Oct 16 2015 12:44 PM

A small adjustment of the "second" arm, towards center, did the trick - its not 100% parralel to the tonearm anymore, but its hardly visible, and the unit is playing as expected - thanks for all the input.

Dave Farr
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They will only be parallel at rest as the tonearm is offset to the left during playing anyway.  Glad it's sorted.  Well done.

Dave.

Dillen
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Dillen replied on Fri, Oct 16 2015 3:13 PM

Adjusting the opto would have been the right way.
The LDR is obviously getting weak and it will only become worse.
When you replace the LDR you will have to adjust the opto - now after having adjusted the sensorarm first.

Martin

danielshen
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Dear Citronix, I have exactly the same problem with yours; Could you kindly send me the picture about the "second arm" mentioned in your solution? You can send me the email to danielshenmail@163.com; I desperately need such solution. Many thanks!

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