1

1. Avoid Humidity & Heat

Avoid placing the PDP-400 in areas that are subject to exces-
sive humidity or heat. Do not leave the instrument near heaters
or in a car exposed to direct sunlight, for example.

2. Avoid Dust & Moisture

Avoid locations in which the instrument is likely to be exposed
to excessive dust or moisture.

3. Power-off Before Connecting

Connections between the PDP-400 and any other device must
be made with both pieces of equipment turned off.

4. Handle With Care

Never apply excessive force to the controls, connectors or
other parts of your PDP-400, and avoid scratching or bumping
it with hard objects. Further, always turn the POWER switch off
after use.

5. Clean Carefully

Clean the cabinet and keys of your PDP-400 only with a clean,
slightly damp cloth. A neutral cleanser may be used if desired.
Never use abrasive cleansers, waxes, solvents or chemical
dust cloths since these can dull or damage the finish.

6. Never Tamper With the Internal Circuitry

Never open the PDP-400 cabinet and touch or tamper with the
internal circuitry. Tampering with the circuitry can result in elec-
trical shock!

7. Electric Interference

Since the PDP-400 contains digital circuitry, it may cause inter-
ference if placed too close to radio or television receivers. If
this occurs, move the instrument further away from the affected
equipment.

8. Check Your Power Supply

Make sure that your local AC mains voltage matches the volt-
age specified on the name plate on the rear panel. In some
areas a voltage selector may be provided on the rear panel.
Make sure that the voltage selector is set for the voltage in
your area.

9. Name Plate Location

The PDP-400 name plate, including the unit’s serial number, is
located on the rear panel of the main unit.

10.Handling Floppy Disks

Yamaha Disk Orchestra Collection and Style Disk are write-
protected, and therefore cannot be used to save songs. To save
Performance Memory songs from the Performance Memory, a
blank floppy disk should be used (one blank disk is supplied
with the PDP-400).

Taking Care of Your Floppy Disks

■Do NOT eject the disk during recording or playback, or at
any time when the disk drive lamp is lit. Doing so may dam-
age both the disk and the FDD.
■Do NOT turn the PDP-400 on or off while the disk is in the
drive.
■Always eject the disk before turning the PDP-400 off.
■When ejecting a floppy disk from the disk drive:

Your PDP-400 will give you years of playing pleasure if you observe the simple rules given below:

• To eject a floppy disk, press the eject button slowly as far as
it will go. Then when the disk Is fully ejected, remove it by
hand.
• The disk may not be ejected properly if the eject button is
pressed too quickly or if it is not pressed in far enough. (The
eject button may become stuck halfway with the disk ex-
tending from the slot by only a few millimeters). If this is the
case, do not attempt to pull out the partially ejected disk.
Doing so may damage the disk drive mechanism and/or the
floppy disk. To remove a partially ejected disk, try pressing
the eject button once again or push the disk back into the
slot, then repeat the eject procedure carefully.
■Do not insert anything but floppy disks into the disk
drive. Other objects may cause damage to the disk
drive or floppy disk.
■Use only double-sided double density (2DD) 3.5-inch
floppy disks with the PDP-400.
T aking Care of Your PDP-400
Disk drive lamp

Precautions Regarding Floppy Disk Use

■Never open the disk’s shutter. Dirt or dust on the
Internal magnetic surface will cause data errors.
■Never leave disks near a speaker, TV, or other de-
vice that emits a strong magnetic field.
■Do not store disks in places exposed to direct sun-
light or sources of high temperature.
■Do not place heavy objects such as books on top of
a disk.
■Avoid getting the disks wet.
■Be sure to store the disks in environmental condi-
tions as specified below:
•Storage temperature: 4
°
to 53
°
C (39
°
to 127
°
F).
•Storage humidity: 8 to 90% relative humidity.
•Store in an area free from dust, sand, smoke, etc.
■Be sure to apply the disk label at the proper position.
When changing the label never cover the old label
with a new label; always remove the old label first.

Head Cleaning

The head of the disk drive unit will get dirty as you use
it eventually causing data errors. If this occurs, clean
the head with a 3.5 inch head cleaning disk (available
from most computer supply stores).

Data Backup

It is recommended that you copy your recorded songs
to another disk for backup (see page 39). If the original
disk is damaged or your song is deleted, the backup
disk can be used instead of the original.

Protecting Your Data (Write Protect Tab)

Write protect tab
open (locked —
write protected)
Write protect tab
closed (unlocked —
write enabled)