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Sony DVD player has a new laser assembly, but won't play discs.

I have a Sony DVP-S735D which was no longer playing DVDs. It could, however, still play CDs. The diagnosis, by my service agent, was a new (and very expensive) laser assembly. I have latterly obtained and carefully fitted a new (but non-OEM) replacement KHM-220AAA laser assembly, but, after entering the service mode menu, the drive auto adjustment just quits on calibration of both DVD-SL and CD. A 'NOTHING' message appears on the machine's display while the calibration is being attempted and, in addition, some of the orange fascia LEDs came on on one occasion. On refitting the original laser assembly, it, frustratingly, doesn't play or calibrate anything at all now, either...not even CDs. I don't have a service manual, so do not wish to go into the unexplored depths of the test mode menu without good advice. Is the problem possibly because something needs to be reset in the service menu before calibration. Any assistance would be much appreciated. Forbes Macgregor

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  • forbesmacgre Feb 27, 2009

    Thank you, Rob. I'm grateful for your cautionary advice. Incidentally, I have just checked the well-known F402 fuse on the meter, and it is showing continuity, so that particular fix isn't one that needs to be done here. Forbes Macgregor

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Forbes,
I think you have taken on a great task. There are many steps to setting up the lasers before auto align can work. There are manual settings which need to be done. The manual will be helpful, however there is a knowledge of how to do the initial settings needed in order to get the unit just to recognize there is a disk waiting to be played. That happens in what is the initializing stage. If the settings are incorrect the unit won't even see a disc. I used to own a service center that was authorized by over 70 manufacturers. Laser replacement was never a swap and play thing. Alignment was always critical. And one more thing you should know. If the laser is too hot after you get it playing it will go bad quickly. You need a meter to check that as well. God luck Rob 

Posted on Feb 27, 2009

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Codes for-
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