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,
I am restoring a Beosystem 5000. I've got the beomaster and beocord working, now started on the Beogram CD50.
Symptoms are:
Powers up, accepts CD, but then spits it out again (yes, it is upside down). Closing the drawer without a CD in it sets it into standby, which I think is correct operation. The fact that there is a difference between with and without a CD means to me that CD detector is working. Front panel displays work as they should at this stage. Drawer powers in and out smoothly.
Opened it up, following Soren's excellent photos. The CD does not rotate at all, so seems like the common motor problem. Took out the motor, and it seems in surprisingly good condition (as does the whole player, to be honest). Nevertheless, dismantled the motor and cleaned and lubricated. Spins like a dream, but still does not work. The motor does not even try to start - when I put a CD in, there is no movement from the motor at all. Lightly spinning the motor with my finger feel no different to doing it without a CD.
Question is where to go next. Does anyone have advice on other common problems besides the main motor? One unusual thing is that there is absolutely no movement from the laser drive system either, but maybe that is normal - I think some CD players do not start the laser focus seek till the disc is up to speed.
regarding age, I think it is a late model as it does not have the early model's servo board. Components on the board are labelled differently to the schematic (transistors are marked as Qxxx on the board, but as TRxxx on the schematic for example). Despite this, there are a number of small modifications on the board (an additional resistor, and two diodes near the motor drive circuit, as well as a strange daughterboard fastened under one of the circuit board screws)
Any advice kindly accepted!
Thanks
Pete
Sequence is;Load CD and press play.Tray drives in.Disc detection;
Disc not present;Standby.
Disc present;Disc is lifted to spindle motor hub.Tracking motor drives the laser blok forward until track zero switch is reached.Spindle motor is activated.TOC is read in.Etc.
If the tracking motor doesn't run, track zero is never reached and the spindle motor will never be activated.Move the laser block manually a bit towards the rear of the deck, press play and watch the tracking motor.If the tracking motor doesn't run, check if it will rotate by hand.Seized? - Take apart, clean and lubricate or replace.Not seized - check DC voltages across it when it is supposed to run.
Martin
Thanks, Martin, your advice is as always excellent. It was the laser block drive motor and gear train which needed lubrication and adjustment. Working great now!