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
Hi All,
I am currently restoring another Beomaster 8000 (yes, it is an addiction...;-). It has one key (TP2) that only works intermittently. It is likely a mechanical problem in the keyboard. When I wiggle it for a while it usually comes back and then works for some time...Before I take the keyboard back off, I was wondering it anyone already did this and could give me some advice?...I am trying to find a permanent fix.
Thanks much in advance!!
Rudy
http://beolover.blogspot.com
http://beolover.com
It can be done but carefully!
When it looks like THIS it's too late
The flat cables break easily at the end and are very difficult to strip again.
Try to glue them first (as you can see they were once glued but in "downwards" position).
Removing the PCB is possible as soon as the 5 sort-of tooth lock washers are removed. You can clean the keys then - I think they were copper plates and mine were really black...
Gunther
Hi Gunther,
Thanks for your input!
I had a broken wire in that location when I did my first 8000...painful...;-). When removing the keyboard back, is there anything that comes loose in a way that it is difficult to reassemble?
How did you clean the contacts? acid or mechanical/sand paper?
Thanks!
Hello Rudy,
The contact plates are just bent through the PCB as you can see on the picture. If they fall off put them back - you have to remove them anyway for cleaning
I use fibre glass pens for cleaning contacts - although their reminders are pretty itchy and peaky
My problem was putting the PCB back - the "clamping rings" were damaged after removing. Had some similar ones in my mechanical fundus...
HTH,
Great idea to use a fiberglass pen! I was worried about scratching the contacts etc...Thanks much!!
Just wanted to give a quick update about the not working buttons of my Beomaster. I took the keyboard apart following Gunther's advice (thanks much!!), and cleaned the contacts. Unfortunately, this did not fix the problem. It turned out the trace between P81 and R103 towards the microprocessor was broken. I installed a bypass, and now everything seems to be fine...I posted a few pictures and a description of the procedure on a blog that I started last year to keep track of my B&O adventures (I was disappointed that my blogs posted on beoworld before the redesign last year seem to have lost their pictures...). The blog can be found at:
http://beolover.blogspot.com/
Enjoy!
HarryPierce:http://beolover.blogspot.com/
That's excellent stuff! That'll give me some ideas if I ever start working on my BM8000 and Lab5000s. Regarding the BL4500 display covers, it would've been easier to just remove them for the polishing. They are attached with - guess what - double sided tape.
Regarding the pictures in the archived forum, they haven't gone anywhere but the references for them are broken. If you use Firefox, install GreaseMonkey and then this to fix them on the fly.
--mika
Interesting input about the 4500s!!...I certainly tried to figure out how to remove the display covers. Where exactly are they taped? I tried to gently pry them off the plastic chassis, but it seemed 'dangerous' to me, and I did not want to break anything.
HarryPierce:I certainly tried to figure out how to remove the display covers. Where exactly are they taped?
On the flat front, round the perimeter. Mine were already loose coming to me, I guess your 4500s are younger enough that the tape was still strong.
tournedos: HarryPierce:I certainly tried to figure out how to remove the display covers. Where exactly are they taped? On the flat front, round the perimeter. Mine were already loose coming to me, I guess your 4500s are younger enough that the tape was still strong.
It's not only a question of age. I have a set of BL 5000's where the covers are still very much in place (I've tried pulling them).A few years ago I bought a set of younger 4500's - where the covers were loose.
B&O have had some issues with this double sided tape - they should know that many people like to keep their products for 20-30 years (and more)
Did you end up getting the covers off, or did you leave them be, like I did?