Panasonic DMR-E80HP Service Manual page 13

6.2.4. Caution when replacing the parts
1. RAM Drive
In case the unit does not operate normally after replacement of the
RAM Drive with new one.
A. While power is off, press [SKIP], [TIME SLIP] and [OPEN/
CLOSE] keys simultaneously for five seconds. Then the unit
turns into "TEST Mode", and the region code is stored on the
new RAM Drive automatically.
After few seconds, turn off the power and turn on the power
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