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Hello, first did you install the batteries with it polaity the correct way. Negative - to spring side of the battery compartment. Postive + to the small flate plate. The hum could possibly be a shorted coil. When the short occurs, the electron leakage across the winding it will start to hum. Then the coil will completly burn out. stewbison
Blowing out dust is not a good idea. access to the laser optics is open on this machine, and you will only make the problem worse, by blowing dust and toner inside. Dirty laser optics are the cause of our problem. The only way to solve is remove top cover of machine remove several wire connectors, remove cover of laser unit and clean all mirrors, motor, and reflectors.
Here's how I've solved same symptoms with our NS -PDVD8a:
1. Cleaned laser optics with isopropyl alcohol/swap --make sure you let the optics dry/IPA evaporate from the optics before running 2. Using compressed air can--cleaned laser track 3. Gently move laser along track several times - it seems laser is having most trouble at start of disc -- not sure it needs lubrication, but running it along track several times seems to have righted it
Had to do this a couple of times, but it's working now -- expect I will need to do this again -- no idea how long fix will work.