Aiwa HS-SP590 Operating Instructions Manual page 10

PREPARATIONS
mm
HOLOswitch+ H
Turn the HOLD/LOCK/OPEN switch to LOCK before
use to activate the buttons on the cassette holder.
When not using the unit, set the HOLD/LOCK/OPEN
switch to HOLD. Accidentally pressed buttons on the
cassette holder will not function.
Volume +
Turn the VOLUME control to adjust the volume.
Super bass +
Set the SUPER BASS switch to ON to emphasize
low frequencies.
Cassette tapes +
Check and tighten slack tape before use with a
pencil or similar tool as illustrated. Slack tape may
break or get jammed in the mechanism.
C-100 or longer tapes are extremely thin and easily
deformed or damaged, They are not recommended
for use in this unit.