Accepted Answer

Hi and welcome to JustAnswer,

Your description indicates a partial fault in the laser system. There would be two (2) separate laser systems in a single package; one for DVD and another for CD since the encoding system of each is different from the other. It would appear that the CD side is operating as expected whereas the DVD side have issues. Causes could be most likely a speck of dust on the DVD lens or in some instances caked/gummed lubricant that is not serving its purpose or any other hardware issue.

The only easy user doable action would be to clean the optics (laser/lens) with the use of a disc drive cleaner or with a can of compressed air (with nozzle tube) if haven't been tried. Unfortunately, other than that, all other corrective actions would require opening the unit including manual cleaning of the laser lens. Options then are:

• seek the services of an authorized service center (especially if the Sharp DV-HR400 is still under warranty) or a qualified professional;
• consider a DIY (do-it-yourself) repair which requires familiarity with electronic components & circuitry, use of a DVM/VOM or even a soldering iron. It is necessary to access a Service Manual or at the very least a schematic diagram and repair checklist. First course of action would be to check availability of the lens assembly.
  

Hope that this be of initial help/idea. Good luck and thank you for using JustAnswer.

Expert:	Benimur
Pos. Feedback:	99.5 %
Accepts:
Answered:	4/16/2009

Technician

25years+ on the field