Honda 1991 Prelude Owner's Manual page 55

Stereo Sound System (cont'd)
CLEAN Indicator Light
After 50 hours of cassette tape play, the light will come on as a
reminder to clean the tape heads. If the light comes on and the tape
heads were not cleaned at the recommended 30 hours of usage (see
maintenance section below), they should be cleaned immediately.
To reset, push the indicator for a minimum of five seconds until the
light goes off.
Defective Tape Eject
The tape player includes a protection mechanism to automatically
eject defective tapes (warped housing, loose label, faulty tape
movement) immediately upon insertion. If a tape malfunctions while
in play, the tape direction will change back and forth and then eject
the cassette. Tapes ejected before play should be considered faulty
and discarded; tapes ejected during play may only be unevenly
wound and could be re-usable if fully rewound, manually, outside the
player.
NOTE:
The tape player may repeat cycle through the loading and unloading
motion several times in an effort to eject a faulty tape. During this
process the tape will either eject fully or rise to the loading level and
have to be pulled out manually. In either case, discard the tape; re-
use may damage the tape player.
Maintenance
The head in the cassette tape player can pick up dirt or tape
deposits each time a cassette is played. The result is low or
"muddy" sound from one or both channels, as if the treble tone
control were turned all the way down. To prevent this, you should
periodically clean the head with a commercially available cleaning
cassette.
As preventive maintenance, clean the head about every 30 hours of
use. If you wait until the head becomes very dirty (noticeably poor
sound), it may not be possible to remove all deposits with a simple
cleaning cassette.
The use of 120 minutes tapes is not recommended.
CAUTION:
Storing cassettes out of their cases, or touching the magnetic
tape with your fingers will increase the amount of dirt that gets to
the tape head. Using low-quality "off-brand" tape will increase the
amount of tape deposits that get on the head. Both of these
practices may eventually lead to damage of the head and playing
mechanism.