Troubleshooting

P-155 Owner’s Manual
ENGLISH
56
Troubleshooting

Problem Possible Cause and Solution

The instrument does not turn on. The instrument has not been plugged in properly. Securely insert the female plug
into the socket on the instrument, and the male plug into a proper AC outlet
(page 10).
A click or pop is heard when the power is turned
on or off.
This is normal when electrical current is being applied to the instrument.
Noise is heard from the speakers or head-
phones.
The noise may be due to interference caused by the use of a mobile phone in
close proximity to the instrument. Turn off the mobile phone, or use it further away
from the instrument.
The overall volume is low, or no sound is heard. • The Master Volume is set too low; set it to an appropriate level using the [MAS-
TER VOLUME] dial.
• Make sure a pair of headphones is not connected to the headphones jack
(page 11).
• Make sure that Local Control (page 44) is ON.
The sustain pedal has no effect. The pedal cable/plug may not be properly connected. Make sure to securely
insert the pedal plug into the proper jack (page 48).
The foot pedal seems to produce the opposite
effect. For example, pressing the foot pedal cuts
off the sound and releasing it sustains the
sounds.
The type of the foot pedal is reversed.
If this happens, use F5.6 or F5.7 to correct the pedal type (pages 39, 43).
The USB storage device is not recognized by
the instrument.
The USB storage device may not be recognized by the instrument depending on
the timing of the device connection.
If the [USB] indicator is already lit by pressing of the [SONG SELECT] button, re-
select the [USB] indicator after turning the [USB] indicator off by pressing the
[SONG SELECT] button.
If the device is still not recognized, it may not be supported by Yamaha. Only use
devices supported by Yamaha (pages 53).
The USB storage device has hung up
(stopped).
The USB storage device is not compatible with the instrument.
Only use devices whose compatibility has been confirmed by Yamaha (pages 53).
The USB storage device does not operate properly.
Disconnect the device and connect it to the instrument again.
The three LEDs of “SAVE TO USB,” “LOAD TO
USER” and “DEL./FORMAT” at the [FILE] but-
ton flash simultaneously when a storage device
is connected.
Disconnect the USB storage device and turn the power of the instrument off. The
USB storage device is not compatible with the instrument.
Only use devices whose compatibility has been confirmed by Yamaha (pages 53).
The three LEDs of “SAVE TO USB,” “LOAD TO
USER” and “DEL./FORMAT” at the [FILE] but-
ton flash simultaneously for five seconds when
the USB storage device is operated.
Disconnect the USB storage device and connect it again.