Aura AUC-50 (Philips CDM-9) CD reading problem

ceharden · 15th April 2009, 12:55 AM

I've got an Aura AUC-50 using a CDM-9 mechanism which has developed a fault reading CD's.

Intermittantly, and often after being powered off for a while, the unit will recognise and start to play a CD, however about 30sec into the first track the spindle motor speeds up and Err is displayed. Obviously it stops playing, and refuses to start again.

After that, if you open the CD drawer and close it, with or without a CD in it, it just ejects again without making any attempt to focus, spin up etc. If you leave it or play with it long enough it sometimes decides to have another go at reading the CD but the same thing happens.

I've done what I think are the obvious things eg cleaning the lens, making sure the swing arm is free (although it's hard to tell how 'free' is free enough). I've even replaced the electrolytic caps on the servo board just in case and resoldered the TDA8008 driver chip.

Any suggestions gratefully received!

ceharden · 16th April 2009, 01:14 AM

No-one got any suggestions?

It's very strange because it behaves normally after it's been powered off for a while (eg an hour or so) but throws its toys out of the pram within 30secs of playing a CD. I've noticed when it stops, it actually reverses the spin on the CD which is quite wierd.

The fact that it can read the TOC off the CD and start playing it when it feels like it makes me think it's more of a control problem than a laser/tracking problem. In fact I even just managed to get it to read other tracks but after less than a minute it started spinning the CD backwards again then spat the drawer out.

poynton · 16th April 2009, 07:41 AM

Out of control speed is sometimes a symptom of loss of clock signal.

Failure after a few seconds could be overheating / partial failure in the power supply.

Andy

ceharden · 16th April 2009, 08:29 PM

Cheers,

I guess I've just got to keep looking...

Most annoying thing is that it was reading CD's fine but had a couple of unrelated problems (blown Op-Amp on left output and missing drawer gear). Fixed those two issues and it suddenly decided to stop reading CD's properly.

15th April 2009, 12:55 AM	#1
ceharden diyAudio Member Join Date: Nov 2005 Location: Southampton	Aura AUC-50 (Philips CDM-9) CD reading problem I've got an Aura AUC-50 using a CDM-9 mechanism which has developed a fault reading CD's. Intermittantly, and often after being powered off for a while, the unit will recognise and start to play a CD, however about 30sec into the first track the spindle motor speeds up and Err is displayed. Obviously it stops playing, and refuses to start again. After that, if you open the CD drawer and close it, with or without a CD in it, it just ejects again without making any attempt to focus, spin up etc. If you leave it or play with it long enough it sometimes decides to have another go at reading the CD but the same thing happens. I've done what I think are the obvious things eg cleaning the lens, making sure the swing arm is free (although it's hard to tell how 'free' is free enough). I've even replaced the electrolytic caps on the servo board just in case and resoldered the TDA8008 driver chip. Any suggestions gratefully received!

16th April 2009, 01:14 AM	#2
ceharden diyAudio Member Join Date: Nov 2005 Location: Southampton	No ideas? No-one got any suggestions? It's very strange because it behaves normally after it's been powered off for a while (eg an hour or so) but throws its toys out of the pram within 30secs of playing a CD. I've noticed when it stops, it actually reverses the spin on the CD which is quite wierd. The fact that it can read the TOC off the CD and start playing it when it feels like it makes me think it's more of a control problem than a laser/tracking problem. In fact I even just managed to get it to read other tracks but after less than a minute it started spinning the CD backwards again then spat the drawer out.

16th April 2009, 07:41 AM	#3
poynton Magneto the Gravity Man diyAudio Member Join Date: Mar 2005 Location: A life on the ocean waves when I'm not at home in N. Wales (but I'm not Welsh so no sheep jokes!)	Out of control speed is sometimes a symptom of loss of clock signal. Failure after a few seconds could be overheating / partial failure in the power supply. Andy __________________ If it ain't broke, break it !! Then fix it again. It's called DIY !

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16th April 2009, 08:29 PM	#4
ceharden diyAudio Member Join Date: Nov 2005 Location: Southampton	Cheers, I guess I've just got to keep looking... Most annoying thing is that it was reading CD's fine but had a couple of unrelated problems (blown Op-Amp on left output and missing drawer gear). Fixed those two issues and it suddenly decided to stop reading CD's properly.

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