I have been using my sony CDP X777es for several months without any problems or skipping etc. It is the best player i have ever encountered. Yesterday my cd player stopped reading any disks. I opened the machine and i do not see the disk spinning at all. sometimes it does after eject and load again, and it take al very long time to read the disk. I tryed several disks with no good result. can it be caused by a mall functioning laser? I tryed to see the laser, but i do not see it. Does anyone have an idea.
Although there's an outside chance it's the laser, two things I would look for first:
With power off, make sure the linear motor laser sled moves freely, so it you lift the front of the unit an inch or so, the laser slides right down, and lift the back, slides easily again.
But, more likely, you have Elna brand electrolytic caps leaking & eating away at the circuit boards. Look for a)black or otherwise cruddy looking cap leads above the board, and b)darkened(black usually) circuit traces under the board. I just did an X33 recently where EVERY single Elna Silmic cap had leaked. I'd recommend replacing all of them in the whole darn unit with Nichicon(Muse or Fine Gold in critical areas) or Nippon Chemicon if you don't want this to ever happen again. At the same time, of course, you need to scrape down the darkened traces until you see nice, shiny copper, and repair any that have eaten through.
With power off, make sure the linear motor laser sled moves freely, so it you lift the front of the unit an inch or so, the laser slides right down, and lift the back, slides easily again.
But, more likely, you have Elna brand electrolytic caps leaking & eating away at the circuit boards. Look for a)black or otherwise cruddy looking cap leads above the board, and b)darkened(black usually) circuit traces under the board. I just did an X33 recently where EVERY single Elna Silmic cap had leaked. I'd recommend replacing all of them in the whole darn unit with Nichicon(Muse or Fine Gold in critical areas) or Nippon Chemicon if you don't want this to ever happen again. At the same time, of course, you need to scrape down the darkened traces until you see nice, shiny copper, and repair any that have eaten through.
I checked the movement of the laser, and occording the technical manual if does what it supposed to do, and yes i lifted the magnet etc. So the liniair motor is moving, the focus part is moving aswell. If I spin the disk manually for one or two revs, the disk start spinning by it self, and i hear some noise of the sledge and focus trying to allign to the disk. This somtimes is done quickly but somtime it takes a long time, but most of the time it resuls in no disk signal.
So far i have seen no leaking caps so far.
The funny this is that it started form one day to another, at night i played several disks and in the morning no sign of live anymore. I expecty when it is the laser, i expect a slow degradation of the laser, so starting to skip tracks etc.
Do you know if it is possible to see the laser at all, even when it is pointing to a whit sheet of paper? I rember on a NAD c541 model i could see the laser (small, but recognisable)
So far i have seen no leaking caps so far.
The funny this is that it started form one day to another, at night i played several disks and in the morning no sign of live anymore. I expecty when it is the laser, i expect a slow degradation of the laser, so starting to skip tracks etc.
Do you know if it is possible to see the laser at all, even when it is pointing to a whit sheet of paper? I rember on a NAD c541 model i could see the laser (small, but recognisable)
It would be extraordinary for this to be an actual laser problem, due to the sudden occurrence. You can try unplugging & re-plugging in the cables/ribbons that connect the laser & mech to the electronics, but I would first be looking for leaking cap damage(or caps themselves drying up/failing)(look especially for any slightest bulging of the top of any of them) or you may just have cracked solder joints somewhere. If you get a look under the boards & don't see any darkened traces, start looking for cracked joints.
I agree that failed caps maybe be a problem,
BUT often/mostly a 'leaky' capacitor shows no outside signs of having failed. "Leaky" referring to electrical leakage, rather than liquid.
BUT often/mostly a 'leaky' capacitor shows no outside signs of having failed. "Leaky" referring to electrical leakage, rather than liquid.
http://pcbunn.cithep.caltech.edu/jjb/Sony/Service_Manual_CDP-X777ES.pdf
I do not know if you have this already. But it is probably a good place to start.
I do not know if you have this already. But it is probably a good place to start.
thanks rtirion
I allready have this manual and did the checkups mentioned in it.
I allready discovered that the distance between the disk and the laser has an unfluence on the behaviour of the player. When i increase it by 0.2mm or less the disk is recognised. I still do not know why it happened so suddenly. It seem to be a machinal adjustment and not an electrical adjustment. but maby an electrical related problem can be solved by mechnics. usualy it is the other way arrond, but i hope it will last, and that i don't have to replace a laser or somthing.
I allready have this manual and did the checkups mentioned in it.
I allready discovered that the distance between the disk and the laser has an unfluence on the behaviour of the player. When i increase it by 0.2mm or less the disk is recognised. I still do not know why it happened so suddenly. It seem to be a machinal adjustment and not an electrical adjustment. but maby an electrical related problem can be solved by mechnics. usualy it is the other way arrond, but i hope it will last, and that i don't have to replace a laser or somthing.
There is a set screw on the disc platter to adjust it's height. It sounds like it needs adjustment, either because it slipped, or the thrust bearing under the platter motor has worn down a bit. Either way, just adjust the platter height until you get good playback on a variety of discs and you're golden.
But DO keep an eye out for chemical leakage from any Elna or Rubycon caps in the unit. They can do a lot of damage.
But DO keep an eye out for chemical leakage from any Elna or Rubycon caps in the unit. They can do a lot of damage.
I could not find any adjustment screws in the laser sledge so i modified the gailde rails in a way so the distance changed by 0.5 mm. And so far everything is working fine. I tryed several disks and all is fine, no skipping quick reading etc, it works as it it is new. I could not find any mechanical wear or tear, no greese spots etc. it looks as if the mechanics are brand new.
So the cd plaer is working perfectly, but i still would like to find an explabation for its sudden behavour.
So the cd plaer is working perfectly, but i still would like to find an explabation for its sudden behavour.
I was referring to the PLATTER motor, not the linear motor tracking sled. There IS a height adjustment set screw on the lower part of the actual platter the disc sits on, and it is not unlikely that this was not tight enough, or loosened, and slipped a little, causing the sudden symptom.
Additional I have often observed leaking surface mounted caps at the PCB for the spindle motor and thus darkened circuit traces through oxydation to the connector pins of this PCB
Thanks foir the information. Some time has passed after my last post. I found a plastic ring or dish inside the laser unit that blocked the movement of the focus section of the lens. I removed it, and after that the machine has been playing perfectly. I still do not know wher the part came from. I looks like an insolation ring for a screw or tiny bolt or so. It had a hole of 3mm inside and outside diameetr of 6 or 7 mm.
Any idea where it came from?
Any idea where it came from?
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