Hi All,
I have a ~20year old Micromega CD3 drive with CDM9 mechanism. Lately started to show some signs of fault. Sometimes after switching on it starts spinning in opposite direction than necessary. Therefore it can not read and identify the CD. The longer the disuse time the higher possibility of fault. (fun fact - the supply transformer is always on, some parts never sleep in this equipment) Has any of you experienced similar issue? What could go wrong? An electrolytic capacitor dried out? If yes, where to start?
Any help appreciated.
Gábor
I have a ~20year old Micromega CD3 drive with CDM9 mechanism. Lately started to show some signs of fault. Sometimes after switching on it starts spinning in opposite direction than necessary. Therefore it can not read and identify the CD. The longer the disuse time the higher possibility of fault. (fun fact - the supply transformer is always on, some parts never sleep in this equipment) Has any of you experienced similar issue? What could go wrong? An electrolytic capacitor dried out? If yes, where to start?
Any help appreciated.
Gábor
It could very well be a cap and although I don't normally say this, the simple answer is just replace them all. All the Philips based players were notorious for cap failures.
If I had this in front of me I would first of all look at the RF when it was playing OK and make a judgement call on the quality of the signal (to give an idea of laser and optics condition) and then look at the caps. This problem may well be one of the smaller caps related to the servo and laser supply.
If I had this in front of me I would first of all look at the RF when it was playing OK and make a judgement call on the quality of the signal (to give an idea of laser and optics condition) and then look at the caps. This problem may well be one of the smaller caps related to the servo and laser supply.
Thanks for the quick response!
I was afraid to hear this... but might be better than replace the mechanism.
I was afraid to hear this... but might be better than replace the mechanism.
Ideally you should fault find using a suitable scope, at least to get an idea of what is going on 🙂 however......
Its very rare you will ever see me say 'replace all the electrolytic caps' but these are one product range where that could well be the way to go. If you do that then take pictures of the board and the actual orientation of the caps as fitted and replace like for like. Do not under any circumstances increase the value of any because that can cause other issues... the rise time of the rails can be important to ensure the start up routines run correctly.
Its very rare you will ever see me say 'replace all the electrolytic caps' but these are one product range where that could well be the way to go. If you do that then take pictures of the board and the actual orientation of the caps as fitted and replace like for like. Do not under any circumstances increase the value of any because that can cause other issues... the rise time of the rails can be important to ensure the start up routines run correctly.