HP Princeton HP-21 - Manual (Page 10)

The Connectors
Using the AC power jack
1. Connect the power cable to the AC power
jack on the underside of the piano.
2. Ensure the piano is turned off when
connecting and disconnecting the power
3. Plug the power cable into an AC power
outlet.
4. Turn the volume switch counter-clockwise to
reach the minimum volume level.
5. If you have done the above procedures, it’s
now safe to turn on the piano.
Caution:
When the piano is not in use or during a thunderstorm, disconnect the power for
safety sake.
Using Headphones
1. There are two headphone jacks underneath
the left hand side of the piano. When an
optional set of stereo headphones is
connected to headphone jack 2, the sound
from the speakers is disconnected – so the
sound is only heard in the headphones.
2. When jack 1 is connected with stereo
headphones, the sound can be heard from
both headphones and the piano speakers
Headphones
Jack 1
Headphones
Jack 2
Caution:
Never use the headphone with high volume, as it may damage your sense of hearing.
To prevent damage to the speakers, ensure that the volume is set to the
minimum level before connecting the power and other devices.
Using the AUX.OUT jack