First post for me. Trying to cleanup the worm gear under the tone arm assembly. I've seen pix of a unit with the tone arm removed but how do you remove the tone arm assembly? The unit is pretty old an I'd imagine those plastic parts are fragile.
What do I lube the worm gear with?
After that, it's a new belt and then onto fixing the dust cover mechanism.
Here's where I'm at..... Login to view image
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Beogram 8002 cleanup
18 replies
Hi and welcome to Beoworld.
I can't answer your question, but what I can advise is to remove and safely store the MMC3 before going any further in your work!
Location: Paris France
Hi Wallygator,
Here are three different posts that have detailed photos of the BG8002 spindle components.
Thanks, Sonavor.
I'll try to clean as best I can without removing the tonearm assemply. That last link had the best photos for this part of the job. If that doesn't fix the reluctant tonearm assembly, I'll have to dig a little deeper. Thanks for the info!
From your photo the spindle doesn't look bad.
When you say reluctant tonearm assembly what do you mean?
How old is the servo belt and did you get a proper one from Beoparts?
A worn or incorrect belt is the source of a lot of problems.
If you have an arm assembly that moves a short way then seems to hang up (and the belt is not the problem) then it is likely a problem with the electronics controlling the servo.
Old capacitors, bad connection somewhere and, sometimes, faulty photo sensors.
There are also two adjustments on the control button panel for the left and right scan control. The service manual specifies what the steady-state voltages need to be for those two controls. If they are not correct they will cause problems with the arm assembly movement. If you dive deeper into the related threads I linked to there should be some posts about those scanning sensors.
If the BG8002 is still operating on original electronic parts then circuits could be trying to operate with out of tolerance components (like electrolytic capacitors that are no longer in spec).
-sonavor
Hi
One thing I'd like to mention is that, if you're cleaning the wormgear be very carefull with solvents like contact cleaner, thinner or acetone, the black coating of the chassis is not very resistant against solvents and will be solved and looking very bad....
Put some papertowels under the wormgear and exchange from time to time while cleaning.
Don't ask me why I know this ;-))
Regards
Christian
Strange behaviors like that are common for Beogram 8000 and 8002 turntables that need restoration. It's difficult to say offhand what the fix for the symptom is because there can be several problems going on. The problems result from bad information from failing circuits reporting what is going on back to the Beogram microcomputer IC. For certain you want to begin with replacing the old electrolytic capacitors. While doing that you should reflow solder joints of all the board connectors. Once those things are done you can retry and see where your Beogram is at. It is a good idea at that point to measure all of the key power supply voltages and perform the service manual adjustments. I also like to check the health of the sensor signals (using an oscilloscope). Those steps should catch any problems. I hope you sourced your servo belt from Beoparts. -sonavorLooks like the sysmtoms you get if: Caps are not excanged, ALL incl. the 47uF in the CPU can. Just have one on the table where the 47 uF was divided into two parts. The Beogram made quiet funny moves ;-)) Lightbulb in the Control panel not working or weak, misadjusted voltage at the light sensors (620mV) for << and >> Fact is if you try to renew only some of the old caps nobody knows when the next will die, so please no "quick and dirty" restauration. look here for further information: https://beolover.blogspot.com/2016/02/beogram-8002-strange-behavior-after-play-arm-moves-2cm.html Here is a good example about Transistor HFE : https://beolover.blogspot.com/2019/12/beogram-8000-fun-evening-with-record-detection-mechansim.html Kind regards Christian
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