ARCHIVED FORUM -- March 2012 to February 2022READ ONLY FORUM
This is the second Archived Forum which was active between 1st March 2012 and 23rd February 2022
Hello again, I made some progress with my new Beogram, I changed a bulb, lubricated all parts and so on. Last thing I need to do is adjust tonearm. It has two problems.
1) when the carriage lid is on, carriage completely misses start of the record and tonearm goes left until it hits detection arm. When the lid is off, it works fine. This is complete mystery for me I don't have a clue what could cause this. I made a video, please take a look: https://vimeo.com/118250981
2) Second problem is that after a record is detected, carriage continues for like another centimetre before it stops. Tonearm is being lowered correctly right after record is detected. This also happens when I press cue button up and then down. When cue down is pressed, tonearm starts to go down, but carriage moves centimetre left. I also made video of cueing up and down: https://vimeo.com/118255524
I appreciate every suggestion, thank you.
There could be several reasons for this, but I would start by fitting a correct sensor arm lamp, the 6V 40mA you fitted is far too weak, I'vetried this myself decades ago.Check the sensor output with a scope and you will see what I refer to.I'm not 100% sure but I seem to remember the tech notes gives the correct specs as 5V 63mA - and do yourself a favour and steerclear off the cheap chinese "toy-" lamps with only 200h lifespan, unless you really enjoy replacing lamps.
Martin
Thanks, I also bought 6V 60mA, so I can try that one. But do you really thing these issues can be related to a bulb? -Sensor arm seems to do exactly what it is supposed to do - solenoid is triggered at correct time. I am guessing that if the bulb was weak, photo cell wouldn't see light and tonearm wouldn't be lowered at all, would it? Even if bulb was the problem, why would carriage go just centimetre too far left and the then do what it's supposed to do?This is really beyond my understanding, but the truth is I am more of a digital person:)
I understand what you mean and there is some reason in it, but it sounds to me like a combination of more faults and insuch cases I like to eliminate as much as possible before diagnosing eventual remaining faults.Others may like to work differently, and each to their preference, but put a scope to the signals and youwill be able to see what happens and what doesn't.
Hello Martin (and anybody who could help), I finally finally received original bulb and new cartridge from the seller and I inserted it in (the bulb) and the problem was not resolved. So I opened the turntable and after adjusting the aperture (under the second bulb, below the tonearm) in the tracking sensor, tonearm lowered correctly at the the start of the record.
SADLY I did not stop there:( I found that tonearm and detector arm are not perfectly parallel so I adjusted it and now the tonearm wont move after it is lowered. Needle stays in the groove of the record for the a little while and then it snaps back so sound is in the loop. Weight is set correctly as I was following manual and Rudi's video. I tried to set pressure to 1g even 1,5g, still the same
After hours and hours of trying and trying I am really desperate and would really appreciate your help:)
Again everything was working well before a started adjusting the parallelism.
I think the problem might be that tonearm is not moving so freely as it was before I started messing with it and so the needle doesnt have enough power to move it. Should I put some oil there? If so, where exactly?
Please see the video https://vimeo.com/121810381
Thank you very much
Solved. The aperture holder was too low after wiggling with it:)
Thanks
Good work! Great to see another 4002 fixed up!
Ben
Thank you, Ben. I am almost almost there, but there is one last thing:)
It'd be great if you could help - http://archivedforum2.beoworld.org/forums/t/14271.aspx