Optimus 120-2117 - Manual (Page 11)

AM/FM Stereo Cassette Player
(120-2117) Care and Maintenance Faxback Doc. # 57144
To enjoy your Optimus AM/FM Stereo Cassette Player for a long time:
Keep the stereo dry. If it gets wet, wipe it dry immediately.
Handle the stereo gently and carefully. Don't drop it.
Keep the stereo away from dust and dirt.
Wipe the stereo with a damp cloth occasionally to keep it looking new.
Modifying or tampering with the stereo's internal components can cause a
malfunction and invalidate its warranty. If your stereo is not performing
as it should, take it to your local RadioShack store for assistance.
Cleaning The Tape Handling Parts
Dirt, dust or particles of the tape's coating can accumulate on the tape
heads and other parts that the tape touches. This can greatly reduce the
performance of the cassette player. After every 20 hours of tape player
operation, use a cassette deck cleaning kit to clean the tape-handling
parts.
Restoring Tape Tension And Sound Quality
After you play a cassette tape several times, the tape might become
tightly wound on the reels. This can cause playback sound quality to
deteriorate.
To restore sound quality, fast-forward the tape from the beginning to the
end of one side, then completely rewind it. Then loosen the tape reels by
gently tapping each side of the cassette's outer shell on a flat surface.
CAUTION: Be careful not to damage the cassette when tapping it. Do not
touch the exposed tape or allow any sharp objects near the
cassette.
Replacing A Fuse
If the stereo does not operate, you might need to replace the wire's fuse
with the supplied spare fuse.
Follow these steps to replace either of your stereo's fuses.