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
I have a beogram 6500, when I bought it a year ago the cable between the mainboard and the arm was missing. I solved that problem. The fuse was blown. After a repaired those things it worked properly untill it came halfway the lp. the arm didn't move further.
I opened it again and I adjusted the gears. When I started it again the second motor(for the arm) didn't work, the motor itself works but it doesn't get any power. I have been searching a long time for a solution for this problem.
Yesterday I discovered the lamp in the arm isn't giving any light. The lamp works and it gets power, what's wrong?
"Yesterday I discovered the lamp in the arm isn't giving any light"
What light? 33/45 LED or the real light for the platter?
First check:
Power supply, there must be 12V. Check it with a light bulb, it must supply 12V around 500mA short time.
Pin 9 of the cpu chip must get 5V.
Does the drive Motor work and react to 33/45 Buttons?
All the lights in the arm don't work.
The motor of the platter works fine.
But the arm gets power.
Can someone tell me why the arm motor isn't working?
Probably the cpu is dead. All lights and LEDs are controlled by the cpu... and there is still no answer wether the cpu gets power on pin 9...
The Motor is controlled by a L272M Driver, controlled digital by the cpu. No cpu, no Motor.
There could be a power Problem with the 5V.
A nice defect is the 3-pin LDR-Light Switch. Port P6. A small 3cm PCB Module 11 used for switching. Maybe the lamp is dead... it is inside the moving arm. Remove the cover.
Everything works in the turntable exept the the light for the photosensor, the light at the and of the arm. I think it's the problem because otherwise the arm motor won't work but the light for the photosensor get's power and there's no resistance (not enough to say it doesn't work).
I already thought about the IC.
http://www.conrad.nl/ce/nl/Search.html;jsessionid=A8B24C6999B0DA8179F7133C910DBECC.ASTPCEN20?search=L272M
Is maybe the light of the photosensor controlled by the IC?
Sorry wrong link above.
http://www.conrad.nl/ce/nl/product/156136/Lineaire-IC-STMicroelectronics-L-272-M-Soort-behuizing-DIP-8-Uitvoering-Dual-power-OP/?ref=no_search_results&rt=no_search_results&rb=1
You are mixing this up here, I think.There is no sensor at the outer end of the arm. The light at the end of the arm is not for a photosensor.On earlier tangential decks the sensorarm was used to sense the presence and size of a record butthose decks had the sensor arm on the leading side of the tonearm rather than the trailing.The tracking sensor is a lamp/LDR arrangement sitting inside the carriage housing.The lamp can sometimes burn and the LDR is known to break down chemically.
Does the tonearm travel to the lead-in groove of the record when you press play ?Does it lower ?Does the << and >> buttons work ?
Martin
I know the light of the photosensor is inside, that lamp isn´t working but it gets power.
When I press play the tonearm travels to the beginning of the lp and it puts the arm down. Then the photosensor should detect when the arm has to move but the light inside doesn´t work (as I said the lamp inside gets power).
The << and>> don't work either.
Well, if the lamp receives a good voltage but doesn't light up, the lamp must be broken.
The lamp of the photosensor gets 0,2V.
Is that enough?
How can I get it higher?
That's far from enough.Can you tell if the up/down switch (S3) has stuck or shorted ?Maybe missing its small bronze spring ?
No it works fine, if the arm is up the light doesn't get any power when down al little bit.
Sorry is was 0,002 volt so there is no power.
How can I give it more power?
Is it the IC? What can it be else?
Check the voltage on the switch.Where do you connect the ground lead of your meter ?
I have connected it to the preamp.
I've just bought a Beogram 9500 and a Beogram 9000. One is for parts.
Note that signal ground and chassis ground is not the same.What happens on the preamp board is not important, find a ground on the main PCB.
I bought a 9500 which isn't a 9500.
The transformer is from one with preamp and the dustcap is of a Beogram 5005/5500.
I build the preamp with the arm into the "9500".
Everything works now but when the arm lowers you hear pop's from the speakers.
The yellow cable of the datalink is also lose but I know where to place it.
When I open it and move the switch which on the PCB I hear the noise.
So the problem isn't in the preamp.
Is the white plug the problem?
How can I get the white plug into place?
Dear All, I'm new in your forum.
My Beogram turntable 6500 has a first problem since long time: it can't play LPs. The lift seems to position correct down, but then stay still, does not follow the groove. The whole unit doesn't move.
This problem does not occur, when playing SP (small/short disks). Here the lift moves to the correct position and follows the groove without any problems.
Any idea, whta I can do?
Best regards, Matthias