CDM12/4's have jumping and skipping included as standard 😉
Easy fix, but requires careful dismantling and removal of the gears and rack and all old grease washing off with iso etc. Use card to get every last bit from out of the teeth and reassemble using just a thin smear of suitable plastics grease. Vaseline etc is way to heavy.
Easy fix, but requires careful dismantling and removal of the gears and rack and all old grease washing off with iso etc. Use card to get every last bit from out of the teeth and reassemble using just a thin smear of suitable plastics grease. Vaseline etc is way to heavy.
Yesterday I have changed the complete laser pickup with brand new and I found that the problem is not with grease .Still skips like one or two seconds with silence. I think maybe is something wrong with power supply. This I know because during play i plugged the night lamp in the power line and then skipped/silenced. Maybe the cd is sensitive on power fluctuation?
Tomorrow I'll post some pictures...
Tomorrow I'll post some pictures...
You need to look at the RF waveform from the pickup to be sure what's going on.
Where did you get the new laser from ?
Original Philips ones are very hard to come by and many of the cheap ones on offer are not good... so I wouldn't like to comment on that.
Where did you get the new laser from ?
Original Philips ones are very hard to come by and many of the cheap ones on offer are not good... so I wouldn't like to comment on that.
The new laser in made in China. Is it normal that old one and new one have the same problem? I think no. These skips are occasional maybe 4-6 times during play the whole cd.
The ones I have seen I'm afraid have been rubbish.
You'll find quite a few threads on this forum too, about the poor quality of CDM12.4's.
You'll find quite a few threads on this forum too, about the poor quality of CDM12.4's.
Today I wanted to take a picture of my CD players front and guess what. It reacts on flash of my camera. LOL.
My experience of these (supplied in white cardboard package) has been of very low output. Others have been obviously pulled from old equipment... pickup dirty and dusty, yet fitted to a new chassis and motors etc.
Anatech is very experienced in CD theory and practice and his findings are summed up here, in post number 3
http://www.diyaudio.com/forums/digi...am1254-cdm12pro-vau1254-cdm12-4-compatib.html
Did they worked or not? Did you experienced difference in sound? Maybe problems with TOC? For now everything works fine.
The last one I got didn't work out of the box... the RF was low at around 0.8 volts pk pk.
I sent it back for refund.
Sound should not be affected unless the signal is so poor it either drops out or it's on the verge of causing the error correction to be audible.
Once it's playing th TOC has nothing to do with it... that info is read at the start and put into memory... it never has to be re read while the disc is in the machine.
I sent it back for refund.
Sound should not be affected unless the signal is so poor it either drops out or it's on the verge of causing the error correction to be audible.
Once it's playing th TOC has nothing to do with it... that info is read at the start and put into memory... it never has to be re read while the disc is in the machine.
No easy answer I'm afraid.
With any fault finding once you have tried a few seemingly obvious things and got nowhere, then you have to start measuring.
So that menas checking the basics... that the supplies are clean and correct, and that the IR receiver is outputting clean "jitter free" data.
For all this you need an oscilloscope.
I see it's has had work done on it too, so that makes it harder. You don't know if it's a "real" or a "man made" fault.
With any fault finding once you have tried a few seemingly obvious things and got nowhere, then you have to start measuring.
So that menas checking the basics... that the supplies are clean and correct, and that the IR receiver is outputting clean "jitter free" data.
For all this you need an oscilloscope.
I see it's has had work done on it too, so that makes it harder. You don't know if it's a "real" or a "man made" fault.
Hi Mooly
How can I lower the sensitivity of cd player because this skip problem is going to be occasional. The gain is normal 220-230v. This skipping problem is related with current. I tried to measure the gain and when I pulled out the test lead of digital multimeter it skipped.I tried this several times and always skipped. Is it possible to insert power protection system like APC?
How can I lower the sensitivity of cd player because this skip problem is going to be occasional. The gain is normal 220-230v. This skipping problem is related with current. I tried to measure the gain and when I pulled out the test lead of digital multimeter it skipped.I tried this several times and always skipped. Is it possible to insert power protection system like APC?
Line voltage should have no influence (unless it drops well below the tolerance in your location) as all the supplies are stabilised in the Micromega.
I think you can discount that.
Don't understand 🙂
"Related to current"... what current ?
What do you mean "measure the gain" 🙂 The gain of what ? What are you measuring when you say it skips ?
Simply, I pulled in and out the test lead of digital multimeter in electrical outlet and then skipped (tried this few times). So it has something to do this. Few post above I mentioned that skipping problem is also related with turning on/off the night lamp. They are o the same outlet. What about UPS? Will the sound be degraded?
That sounds very strange to me. You are saying measuring the AC volts in a nearby socket causes the skipping.
Does it skip if you measure on another socket in another room. When the leads of the meter break contact you get a small arc... unbelievable if that is causing a problem. The arc can radiate a burst of RF energy... again I find it hard to imagine it causes skipping.
Have you tried the player on another socket in the house ?
So you need to prove it... a UPS is way over the top... I wouldn't entertain that idea. UPS vary in quality too... you need a pure sine wave output.
Easiest option is to make/fit/buy etc a filter. Perhaps a line to line and line to ground filter arrangement, with small choke and VDR as well. You can buy these things made up as "filter plugs" etc
What you are describing isn't a normal sort of occurence.
Does it skip if you measure on another socket in another room. When the leads of the meter break contact you get a small arc... unbelievable if that is causing a problem. The arc can radiate a burst of RF energy... again I find it hard to imagine it causes skipping.
Have you tried the player on another socket in the house ?
So you need to prove it... a UPS is way over the top... I wouldn't entertain that idea. UPS vary in quality too... you need a pure sine wave output.
Easiest option is to make/fit/buy etc a filter. Perhaps a line to line and line to ground filter arrangement, with small choke and VDR as well. You can buy these things made up as "filter plugs" etc
What you are describing isn't a normal sort of occurence.
I tried in another electrical outlet and nothing happens?!It doesn't skip. I'll try to plug the player in another socket. I didn't mentioned that I have power conditioner (600VA) on the same line.Maybe this is causing the problem? But as I know its here to filter the electrical noise!
What kind a filter are you talking about? Can you post some pictures? 🙂
What kind a filter are you talking about? Can you post some pictures? 🙂
Last edited:
Why not try the player in another house ? It shouldn't be affected like you are saying.
Your Search Results | CPC
PRO ELEC|SSP|SPIKEY SURGE SUPPRESSED PLUG | CPC
Your Search Results | CPC
PRO ELEC|SSP|SPIKEY SURGE SUPPRESSED PLUG | CPC
Mooly,
As I see you have the very similar PCB board in your stage 2 cd player. Perhaps you have the eprom near the flat cable that comes from display board. And can you tell me what is purpose of that eprom, what is his function? Is it related with remote control functions? 🙂
As I see you have the very similar PCB board in your stage 2 cd player. Perhaps you have the eprom near the flat cable that comes from display board. And can you tell me what is purpose of that eprom, what is his function? Is it related with remote control functions? 🙂
- Status
- Not open for further replies.