Sony PlayStation Portable PSP-1004 Instruction Manual page 140

Sound
There is no sound.
, Check that the volume is not set to zero. Try raising the volume
( pages 18, 22).
, Check that the mute setting is not on. Press the sound button on the system
front to clear the mute setting (
, If Headphones are inserted, the system will not produce any sound through
the speakers.
, See also "There is no sound, or the sound quality from the headphones is
poor" (
The volume does not turn up.
, Check that the AVLS feature is turned off. When turned on, the AVLS
feature limits the maximum volume of the Headphones (
, The ear friendly Headphones are specifically designed to limit sound
pressure level to a maximum of 90dB.
Sound quality is poor.
, If the system is used in an area where there are vibrations, or if it is near
strong magnetic objects such as a television, the sound may be distorted and
there may be increased background noise. Try moving the system to a
different location.
UMD™
The system does not recognise the UMD™.
, Check that the UMD™ is properly inserted (label is facing the system rear,
etc.). Try taking out the UMD™ and reinserting it.
, Check that the UMD™ recorded surface is clean. If not, wipe it gently with
a soft cloth (
140
Troubleshooting
page 144).
page 15).
page 34).
page 104).