My Krell kavcd300cd has been having problems with reading cd's, taking a long time to load, not being able to find a selected track, not reading some cd's at all, so I changed the laser assembly, I stupidly forgot to remove the static protection solder blob, now the disc is not spinning, can any one please help.
Have you installed a faulty from new laser assembly. Apparently it's quite common with Chinese sourced lasers.
Hi ColinA, thank you for your help, I replied but it has not shown, so I assume I done something wrong. I replaced the original laser, and the problem still exists, I'm not an engineer, but get the feeling not removing the solder static protection, may have blown something, I got the replacement from a uk based ebay seller for £10.
You posted all the personal details (home address) which is why your post was not allowed.
(Leaving the solder blob on will not damage anything)
Hi Mooly, My apologies for making this mistake, won't happen again, thanks for the info, I have checked all the connections, I can see the laser lighting up with my video camera, but the disc is still not spinning. will have a look at LTspice.
In post #1 you mention the player seems to work although not very well. If the replacement laser is not even spinning a disc at all then it could well be a problem with the new part.
What is the laser pickup type number ?
What is the laser pickup type number ?
So has the 'fault' changed from you originally starting out on all this, because it does read as though it was working, at least up to a point.
If so then you need to very carefully check all you have done. Make sure the flexiprint is undamaged and that it is correctly clamped in the pickup socket.
Beyond that and you are into more much more involved faultfinding requiring the use of an oscilloscope.
KSS213C are available from here:
UNBRANDED - LPU31105 - SONY KSS213C CD PICK UP | CPC UK
and here:
Search results for kss213c
You'll see how much the genuine parts cost.
If so then you need to very carefully check all you have done. Make sure the flexiprint is undamaged and that it is correctly clamped in the pickup socket.
Beyond that and you are into more much more involved faultfinding requiring the use of an oscilloscope.
KSS213C are available from here:
UNBRANDED - LPU31105 - SONY KSS213C CD PICK UP | CPC UK
and here:
Search results for kss213c
You'll see how much the genuine parts cost.
Hi Mooly, thanks for all your help,first thing I done was clean the laser lens made no difference,
the disc was spinning fine up to the point when I replaced the laser, I understand the basics of electronics, but have no faultfinding equipment,there is no visible damage, I have had the unit for over ten years, got it second hand, so it's not done bad,
the disc was spinning fine up to the point when I replaced the laser, I understand the basics of electronics, but have no faultfinding equipment,there is no visible damage, I have had the unit for over ten years, got it second hand, so it's not done bad,
The platter will not begin to spin until the laser finds focus on the reflective layer of the CD. Its done that way because its much easier to focus on a stationery object. Only when that focus point has been found will the disc be kicked up to approximately the correct speed, at which point the servos take over and alter the disc speed such that the data coming off the disc is compared and locked to an internal crystal oscillator.
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