CD reading probs for Berendsen cdp1

[Littlebear]

Hi SS,

Gladly! Hope they view well:

Murf

 

[stephensank]

Can't tell a lot from the available photo resolution, but I'm concerned about what looks like heat damage around the leads of that big 4700uf/16v through-hole cap. Can't tell if it's from repeated resolder/desolder attempts, or if the cap is getting that hot, which it darn well shouldn't. If it does get hot, it should be replaced. Can't see much else, except that the chips are, surprisingly, Samsung, and the servo chip is, indeed, of the "auto calibrating" type, likely a clone of the Philips. Assuming that replacing that one cap doesn't fix it, and no service info can be found, I would do two things. First, I would resolder all three of the large qfp chips & the other chip under the heatsink. Second, I would replace ALL of the electrolytic caps on the board. I'd use through-hole Nichicon caps with leads cut & formed, as I still don't trust smd lytics. If you don't have soldering "tweezers", I've found the best way to remove smd lytics is to use two soldering irons, to heat both leads at once, flipping the cap off the board once both sides are melted. If these steps don't fix it, it might be hosed. You could see if you can find datasheets for those three big chips online, which could help narrow down the locale for the fault.

 

[TimA]

Stephensank,

A quick thankyou for your suggestion here and on another thread for motor silicon lubrication treatment. Having replaced the laser and cleaned/lubricated the gears/sled on my Sony 5BU20 mechanism it persisted with intermittent skipping. Treating the sled motor will silicone oil as you described seems to have done the job nicely. Not a single skip for hours now. Thankyou.

Tim.