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
After replacing the caps on the servo board, all was well, and it played different cds without problems.Until today. Now it loads the disc, displays track no.s, and eitherpretends it is playing without the counter changing or any sound, orplays forward fast - it sounds like it is playing every other sample, or something like that.Any solutions?Is it possible that another failed component is causing one of the new capacitors to be stressed over time, and so fail after a day or so?John
There has been a 6 month pause in working on this problem. Now I want to sort it out. And I'm quite sure my old friend would like her lovely B&O back!
I see that the service manual I downloaded from this site for the Beocenter 9000 is missing some pages, particularly to do with fixing a faulty CD player. Are there other manuals here [or elsewhere] that will give me full details of how to fix the CD mechanism and/or circuits in this Beocenter 9000?.
Please?
I'd really appreciate any help or suggestions with this. I have multimeters, milivoltmeters, signal generators and oscilloscopes available.
John
The servicemanual will not tell you how to repair the thing.
It merely tells you how the thing was built and how to calibrate and align.
It's then up to the trained tech guy to diagnose and repair based on his education, his experience, the symptoms and schematics/check points in the manual.
A CD drive is not particularly easy to repair - and it's not safe to say, that the drive is at fault in your Beocenter.
Did you use the correct brand and type of capacitors for the servo board? At least one of the capacitors is very critical when it comesto its filtering properties and not just any cap of the right value will work.Check the power supply first, for correct voltages and amount of ripple.
Check solder joints around the voltage regulators and the large filter capacitors.
Whatever you do - DON'T adjust anything!
It's not a bad adjustment and touching the adjustments will not repair anything. (Quite contrary).
Martin
Sorry, I didn't make myself clear. I'm not expecting the manual to tell me how to fix it, but I had hoped to see some waveforms (EG) showing how certain points on the CD system should look when working properly.
YEes, it is up to me to work out what or where the problem is.
I agree, the problem may well be not with the cd drive but something else.
Yes, the capacitors were all replaced with your kit, for which I thank you! :)
thanks for the useful hints and pointers.
OK, I won't adjust anything.
I had to replace the adhesive strips that hold the glass panels to their plastic frames, and now some 'buttons' are very unresponsive, particularly along the bottom row. I have to press hard to get them to respond. I bought the adhesive strips from a UK supplier [ not B&O ] . If the glass was too high might that be causing the insensitivity? (I'm not sure how the 'buttons' work, is it capacitative?)
Many thanks for your help.
The conductive surfaces under the touchpads need to establish a good contact to the rubber "bongos" on the underlying circuit board.
The double-sided tape sold on Ebay is too thick. I have removed it from several Beocenters coming in here.Use very thin tape, or glue the plastic frames directly to the glass.
Thanks for that, Martin.
Should the top of the glass panel be flush [same height] as the plastic frame, (or how much above)?
Mine with the 'thick' double-sided is 1mm above.
The glass is never flush with the plastic frame pieces, it sits a little above.But 1mm may be too much.
There is a chamfer on the glass which is visible above the plastic on a new panel.
Regards Graham
Thanks Graham, that's useful.
Mine currently has nearly as much vertical edge of glass above the plastic as chamfer. So that suggests the double-sided strips I bought from Quality Dream Audio are just a bit too thick.
Anyone else used their strips?
One of the end-piece plastic frames (that go around the glass panels) is broken. Does anyone know where I may be able to buy a replacement? Please? (Bottom [control] panel, Left hand end, with fixing screw in the corner.)