[QUOTE=willp;2546614]U99 errr. I finally fixed my error–lt’s an old unit but still preferred–I’l tell you if you ned information on what I did,
Yes, by all means, describe how you fixed your DMR-ES15.
According to the service manual the U99 error is specifically a “hang up” displayed when there is a communication error that has occured between the main microprocessor and the timer microprocessor.
With more than twenty Panasonics (including four DMR-ES15 models) I’ll offer my own observations:
There can be any number of causes for the U99 error, including a culmination of reading, writing, finalizing errors–sometimes appearing after U61 or U88 reading errors. The U99 error might also be associated with unusual DVD Drive noises, “grinding” indicating a dirty rubber hub and spindle; “clunking,” “chugging” or “errrp” noises indicating a dirty lens or a failed laser assembly (the “optical pick-up”).
Initial remedial measures include the routine DVD Drive lens, rubber hub and spindle area cleaning described in other CDFreaks/MyCE and AVS Forum threads. If that does not correct the problem(s) laser assembly or DVD Drive swapping with a direct replacement may be indicated. Also check for a disturbance to a ribbon cable or ribbon cable contact, correct or repair as necessary.
If the Digital PCB has become problematic, model-specific replacement is indicated. If the DVD Drive on-board contoller (if so equipped) has become problematic, model-specific replacement is indicated. In most cases “model-specific” means the same model year DVD Drive and, with problematic Digital PCBs or DVD Drive controller boards, replacements should be from the same model year and the same or very similar model recorder. Laser assemblies should only be replaced with the same model, i.e., 3331A and 3332A “optical pick-ups” might not interchange satisfactorily.
The U99 error may also be displayed when inferior media is in use. (Beginning in 2008 I’ve used nothing but Taiyo Yuden 8x Premium Line DVD-R media in my Panasonic, Philips and Magnavox DVD Recorders and HDD/DVD Recorders.)
The U99 error may also be displayed when there is an operating system “time out” occasioned when the user attempts to move too quickly between digital and analog channels (in 2007 and newer EZ series models).