This seems to be a common fault with many Panasonic DVD recorders of the DMR-EX series.
This is one of several error codes generated by the main microprocessor IC in the unit which are
tripped by corruption, preventing proper operation and which may require the
processor to be reset (where practical) or replaced.
U81 means (in technical terms)
'microprocessor communication malfunction' on the universal asynchronous
receiver/transmitter' or 'microprocessor feedback information error'.
This is not something the user should undertake to repair
themselves; it should really go to an authorised Panasonic repair centre. The
cost depends on the parts used (if available) and the labour, however, it is not
unfixable. You can always get a quote on this and a second opinion, then decide for yourself if it is economical or not.
I
posted this 'advice' for this (and a couple of similar models) previously. The
DMR-EX series of models are prone to U81 - which is a common (and
extremely irritating) error code. As I said, it is not unfixable, if you
are prepared to spend a fair amount of money on the repairs by a
qualified service technician in a fully equipped workshop with access to
all the required components and service manuals.
Because of the malfunction, the user settings and options are inaccessible, and there is no official user-reset option on this or any model of the series to clear this particular error.
Certainly worth investigating at least, as Panasonic usually make great products. It's up to you as to what you decide to do from here.
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