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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 imp