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                     For Authorised Service Agents Only
                                                                                Ref No:    339643015367487SHR

                                                                                Date:           05/10/2009
     TECHNICAL INFORMATION                                                                Created by
                                                                                  Panasonic UK - Service Group

Document Category:            Knowledge Base


Subject:                   ERROR CODE

Model(s) Affected:         DMR-EZ45VEB      DMR-EX75EB        DMR-EX85EB       DMR-EZ25EB         DMR-EZ27EB

Problem / Issue            U80 and U81 Fault Code

Solution:                  See Below



  The U81 code indicates errors on the IIC data lines between the freeview (called backend PCB) and digital
  PCB which control the recording functions.

  The U80 code indicates errors on the IIC data lines between backend and timer IC on main PCB which
  control the boot up/remote functions

  1) Reflow the on board flash ROM and memory on the backend PCB--some dealers report this as curing
  intermittent U80/U81 codes.

  2) Also check and reflow the edge connectors on backend PCB and main PCB. Also check/ reflow the
  soldering of the digital PCB's connection socket on main PCB.

  3) Using an oscilloscope, check all LT supplies to digital PCB and backend PCB areas are OK (free of
  ripple)> see circuit board interconnection diagram (in service manual) to easily check what voltages are
  going these pcbs.

  CHECK THE BACKEND PCB 3.3V 12V, 1.8V LINES CAREFULLY AS NOISE /RIPPLE ON THESE LINES
  MAY CAUSE PROBLEMS.

  See the unit's interconnection diagram in the service manual for an easy view of PCB interconnections and
  voltages on socket pins.

  See attached diagram for example from ex75 of interconnection diagram

  4) If the unit is working and fault intermittent, upgrade the unit's firmware -available from (Pananet System)

  5) Next, carefully reflow inside of tuner and retest > especially the surface mount ICs in the tuner. After
  reflow clean the PCB thoroughly with flux cleaner. C304 (electrolytic) on the tuner PCB may also be
  replaced.

  6) Replace tuner if fault persists and retest. Also inspect the soldering in the new tuner as in point 5.

  7) If the above fails to cure the issue then replace the freeview backend PCB and retest and go back to
  step 1 if necessary.

  8) Some dealers report that using used 3 or 6dB attenuators (in aerial feed) to bring down high signal
  strengths stops intermittent U80/U81 codes.



            Confidential                             Page 1              339643015367487SHRREV1
Use a digital strength meter to look at aerial levels. If they are high, try an attenuator. The unit's own signal
strength meter in the menu can also give an idea of strengths. Typically if the strength bar is already 100%
then try a 3dB or 6dB attenuator to see the problem improves.

Trying a 6dB attenuator in line with aerial can be an effective test.

Most aerial systems should have a least this level of safety margin in the signal strengths (good aerial feed
etc) before blocking and pixilation occur. The benefit of this is that it may also take down unwanted MUX
signals that are causing the decoder problems.

If problems persist then email AV technical with the following:

1. Serial and model numbers
2. Software versions levels > noted from the service mode> see service manual
3. The channels being viewed when the error happens > MUX2 channels (itv and ch4 dvb) seems to be
more problematic!> but please confirm
4. How often the fault occurs in a week or day

============
Please check that C1801 is not leaky or S/C if so IC1801 will also need to be replaced these components
are located on the POWER/DIGITAL IF PCB.

The IC supplies the 1.8 Volt rail. Please see attached foil layout for location.




         Confidential                              Page 2               339643015367487SHRREV1

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