Question about Panasonic DMR-ES35VS

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DVD Recorder DMR-ES35V is showing a U99 on the display panel. Cannot operate it. It has had very little use although we have had it for two years.

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  • stanglyn May 23, 2011

    Tried that. No result.

  • stanglyn May 23, 2011

    Thanks. Will try. What exactly are supply contact plugs and where would we find them?

  • stanglyn May 26, 2011

    Thank you for your detailed instructions. However we are going to pursue this under the Consumers Guarantee Act so have been advised now not to attempt to fix it ourselves. Appreciate your fast response - please go ahead and charge for your services.



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[U99], on display indicates that the unit fails to operate properly. Press [POWER] button on the main unit to switch the unit to standby. Now press [POWER] button on the main unit again to turn ON the unit. OK.

Posted on May 23, 2011

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  • The Knight
    The Knight May 23, 2011

    If so, fault is with its power supply regulator board inside. Panasonic fault messege page of your DMR sates this, that I've quoted above. Due to long time non-use the plug in connections from the power supply reguator board to main board, will have insufficiant contacts or loose of fungus infected problems may arise. If you can, and able, open your DMR after disconnecing it from AC mains supply and pull out each supply contact plugs in the power supply board, and reset it to ths same, one at a time. If this also does not help you, the device need service, and contact the nearest panasonic service center.

  • The Knight
    The Knight May 23, 2011

    moreover, disconnect the unit from AC mains wall power socket, wait for some time, say 15 minutes or so, and try again.

  • The Knight
    The Knight May 23, 2011

    Hello --- Locate the power regulator board inside. It can be easly located as main power goes diretly to it. From that board, several low DC voltages are derived and given to different circuit boards of your device. They are all not diretly soldered to the power board. Instead, are conneted with pull-out and plug-in sockets; can be seen at the edge of that board. You can pull the wiring connections from the socket by pulling it out, and then replug it into the same socket. If there is some loose or fungus infected connections, that we cannot detect by ordinary or meter mesurements, will clean out and the contacts will be clear. There may be two or more such socket connections, whcih will look alike, that is why i adviced you to pull-out and plug-in one by one at a time, so that there will be no possibility of interchanging them. Thinks you got me. OK.

  • The Knight
    The Knight May 26, 2011

    Hello ---- Thanks for your timely response.



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DVD Recorder MODEL no.DMR-EZ27EB has U99 on screen unable to operate it


U99 is a general communication failure between processor and timer, and there may be different causes. Common cause is a defective disk. Removing disk from the drive sometimes may fix the problem.

The first reset that you can attempt is disconnecting power for two minutes.

I quote below a post that was originally published in the MyCe forum (here):

"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)."

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Try turning off the power and unplugging off-unplug for at least five minutes before reconnecting.

If U99 reoccurs, you should contact the Global Service Center Network for assistance.

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