Sharp PC-1403 Operation Manual page 116

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(1) For any transfer or verification, use the tape recorder that was used for recording.
If another tape recorder is used, transfer or verification may not be possible.
(2) Always use only the highest quality tape for programs and data storage
(economy grade audio type tape may not provide the proper characteristics for
di g ital recordings).
(3) Keep the tape heads and other parts that contact tape clean. Use a cassette
cleaner tape for this purpose.
(4) Volume setting - Set to middle or maximum level
Volume level can be very important when reading in data from the recorder;
make slight adjustments as required to obtain error-free data transfer. A slight
adjustment either up or down may help produce perfect results every time.
(5) Be sure all connections between the computer and cassette interface are secure.
And be sure the connections between interface and recorder are secure and free
of foreign matter.
(6) If problems occur when using AC power for the CE-126P and/or the recorder, use
battery power instead (sometimes the AC power connection adds some "hum"
to the signal which may upset proper digital recording).
•To connect the AC adaptor to the CE-126P, turn the CE-126P power off and
then connect the adaptor to the CE-126P.
(7) Tone control - Set to maximum treble.
(8) When recording programs or data on used tape, erase some beginning portion of
the used type before writing and then execute the BASIC command for recording.
(Make sure that the previous program is completely erased without any portion
remaining.)
Tape Notes
Using the Options