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My machine will not read previous dvd's recorded on it

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Hello john750,

You can try a cleaning disk, however it has been my experience that the cleaning disk will not help, but it is a good place to start from. More then likely it is a problem with the laser pickup photo-transistor, these often malfunction causing this problem. I would suggest if you are going to try to repair this yourself, you will need a multimeter, a laser meter, and a schematic. The first step is to measure the laser energy leaving the laser diode and see if it matches the specifications in the schematic, if it does not, check the bias voltage with the multimeter, this is to determine if the problem is the bias voltage or the diode itself. If the diode is bad replace it. if the diode is good then the pickup becomes suspect. Using the multimeter measure the bias voltage on the photo-transistor with and without the presence of the laser light from the diode. This will tell you if the photo-transistor is good or bad, if the transistor is bad replace it , if it is good check the components that make up the biasing circuitry.

Now This test will produce a test of go or no-go on the laser diode and the photo-transistor. One of these components or their related biasing circuitry is either bad or about to go bad, by testing the voltages and laser light levels you should be able to determine which one or if both have a problem.

I hope this helps,

Thank you,

Shuttle83

Posted on Oct 08, 2008

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