Yamaha Electone EL-57 Owner's Manual page 63

Cleaning the Disk Drive Read/Write Head
Clean the read/write head regularly. This
instrument employs a precision magnetic read/
write head which, after an extended period of
use, will pick up a layer of magnetic particles
from the disks used that will eventually cause
read and write errors.
To maintain the disk drive in optimum working
order Yamaha recommends that you use a
commercially-available dry-type head cleaning
disk to clean the head about once a month. Ask
your Yamaha dealer about the availability of
proper head-cleaning disks.
Never insert anything but floppy disks into
the disk drive. Other objects may cause
damage to the disk drive or floppy disks.
About the Floppy Disks
To handle floppy disks with care:
Do not place heavy objects on a disk or bend
or apply pressure to the disk in any way.
Always keep floppy disks in their protective
cases when they are not in use.
Do not expose the disk to direct sunlight,
extremely high or low temperatures, or
excessive humidity, dust or liquids.
Do not open the sliding shutter and touch the
exposed surface of the floppy disk inside.
Do not expose the disk to magnetic fields,
such as those produced by televisions,
speakers, motors, etc., since magnetic fields
can partially or completely erase data on the
disk, rendering it unreadable.
Never use a floppy disk with a deformed
shutter or housing.
Do not attach anything other than the
provided labels to a floppy disk. Also make
sure that labels are attached in the proper
location.
To protect your data (Write-protect Tab):
To prevent accidental erasure of important data,
slide the disk's write-protect tab to the "protect"
position (tab open). If you attempt to modify the
disk when the write-protect tab is set to "on"
position, "Prot (Protected)" will appear on the
LED display in the M.D.R. section indicating that
the operation is not possible.
Rear side
Shutter
Write-protect tab
Data backup
For maximum data security Yamaha
recommends that you keep two copies of
important data on separate floppy disks. This
gives you a backup if one disk is lost or
damaged. To make a backup disk use the Disk
Copy function on page 74.
Protect Off
(tab closed: unlocked)
Protect On
(tab open: locked)
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