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
Recently after 26 years or so, my mom and dad gave me our old Beocenter 9500.
It had been sitting in their livingroom plugged in but untouched for about 10years, at christmas I cam by an though i put on a CD...
No or intermittent sound in speakers 1, both channels had issues, CD couldn't be found or would fail every second time and when I tried tape, the thing was slower than my old SAAB.
So acquired Tape belt kit , muting relay, CD Servo baord cap kit and CD door belt kit from Dillen.
These things are realy made for repair! So easy to service, everything folds out or in or backwards.
Faulty Muting relay, here you can also see that the PCB needs to be unfastened from plastic studs, that separates the board from the output transistors that are screwed onto the heatsink, these plastic studs are quite brittle and the flatcables conneting the board to the transistor pack, need to handle with care not to crack the PCB
Then here are one before and after soldering the relay into place, upper left corner!
after
Now time for the CD servo board, The tricky part here was that to disassemle the board from the CD mechanics, there is a little cosmetic plastic grid (it obscures the PCB when loading a CD9 and a little plstic flat clip that keeps a foild cable in place between the swingarm and the PCB, all those bitts fall out when the four screws holding the board to the mechanics are removed... anyways, the rest was just a bit of soldering
Before and after pics:
After:
Bottom left you see the connector for the foil cable. Be aware that the hight is limited under that plastic grille (cosmetic cover mentioned above) so do keep those legs short on the caps!
Now the tape belt, this was was scary as quite a bunch of you outhere said it was tricky to get in place....but it wasn't that bad once i had the old pictures to fall back on... but geting the whole thing out was a bit tricky as the tape module was clamped down pretty good with cable binder.
here is just the after pciture...
So.. I was happy , the sun was shining, I hooked the new CD and tape door belts in place, and while in the service position, hooked it up and everything worked, not a single mistake...but
The CD door .. it was slow, it was it didn't make it all way to open, depressing the "Load CD" button twice again made it go all the way back. same with closing, it eventually made it but it was struggeling... with a brand new belt...
also this it hadn't done before.. so had i screwed it up... checking dirt, lube, wires, alignment,,, everything was as it should... what the!?
So I studied the scriptures (the forum) and two other possibilities suggested themselves, an opamp IC L272 being bad or that the motor is running but is worn out so out of torque.
Before I go soldering IC which i admit is not my strongest side, I will replace the motor with a one i found on Beoparts.
Anyone with more suggestions are welcome,. will update when motor is in place.
BM 2000 *1974, 2x BM 1200, BM 1001, BG 1200, BG CD X, BC9500,BM3300,Bcord 3300, BG CD3300, Beovox Cona, Beovox CX100, Beovox 1200, Beovox RL60.2
Here is a video of the door making my life hard
https://youtu.be/in6j5Wr2K9E
My mother in law's BC9500 used to do that. I tried to clean everything thing up inside and it still opened slowly and often stuck half closed. Then one day it simply started working again. I put it down to lack of use! How's the tape door?
Great pictures by the way. I've replaced the tape belt in both mine and mother-in-law's, replaced the lithium battery in hers, and also the relay in mine.
And here's a thought: to save fitting a new motor, try powering the CD door motor from the Tape motor power connectors, and vice versa! Without looking at the schematics, there's a chance that could simplify the fault finding!
Or swap the two motors.
Martin
Its sunday evening and im swapping my Beocape for my civilian outfit of menial office worker at the local pharma :=)
next chance of some joyful time at the soldering station is next weekend and by then the motor will have arrived,,
I will apply myself to swapping in the new motor, but also swapping the old into the tapedeck... it will be a glorious weekend haha.. thanks all for ideas, i will report back promptly!
Hi all,
To update the forum on the door issue... after over 3 weeks of bizzare screw-ups by the Swedish/danish Postal company (POSTNORD) they lost one motor in the mail!!!
Out of great kindness, Dillen offered to donate another motor, to prevent the miserable Post from fouling up again it was sent registered.
Motor arrived no more than 3 days later (proof of how it should be!) and i popped it in an the door is now moving in super speed! like new.. all my analysis and it was the motor.
So for all of you out there who are trying to diagnose a slow moving door, don't discount the fact that the motor can be bad even though it does turn around....
Thanks again Dillen!
Congratulations - thanks for letting us know!