Sharp MZ-80A Owner's Manual page 215

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225
Power switch operation
Once the power switch
is
turned
off, wait at
least 1
0 seconds before
turning it
on
again. This
ensures
correct
opera¬
tion
of the microprocessor. Never
insert
the power plug
into
an AC
outlet with the
power switch
set
to
ON.
Cassette deck maintenance
Dirty
cassette deck recording and reproducing heads may result
in incorrect
data recording or reproduction. Be
sure
to
clean the heads every month. Commercially available cleaning
tape is
convenient.
Discoloration of CRT screen
If a
certain
spot
of the CRT screen
is lit
an
external period of time the spot may
become discolored. (If
it is
neces¬
sary for certain spot
to
be lit for
an extended time, turn down the brightness
control on
the display control unit.)

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