Troubleshooting – Yamaha DSP -A780 User Manual
Page 39
37
PROBLEM
POSSIBLE CAUSE
WHAT TO DO
Power does not come on.
AC cord not properly plugged in.
Carefully plug AC plug into outlet.
Hum.
Bad cable connection.
Firmly plug in all connection cables.
No sound.
Bad or incorrect input connection.
Check connections.
Incorrect input source selection.
Select the appropriate input source with the input selector switch.
No sound from the effect speakers.
The EFFECT switch is set off.
Press the EFFECT switch to turn on.
The DOLBY PRO LOGIC program is being used
Use a different sound field program.
with material not encoded with Dolby Surround.
No sound from the center speaker.
The center mode is in “PHNTM”.
Select the appropriate center mode.
Incorrect sound field program.
Select the appropriate program.
The sound suddenly goes off.
The protection circuit has activated because of
Turning the unit off and then on will reset the protection circuit.
short circuit etc.
The volume level cannot be increased,
The power to the component connected to the
Turn the power to the component on.
or sound is distorted.
REC OUT jacks of this unit is off.
DSP parameters or other settings on this
The “MEMORY GUARD” function is
Turn the “MEMORY GUARD” OFF.
unit cannot be changed.
set ON.
Left rear and right rear channels not
This is normal operation and is an exact
balanced in certain digital sound field
duplication of the actual data which was
programs.
measured for that particular hall etc.
The sound field cannot be recorded.
It is not possible to record the sound field on a
tape deck connected to this unit’s TAPE
REC OUT jacks.
The remote control unit does not function
Dead batteries.
Replace batteries.
properly.
Wrong distance or angle.
The remote control unit will function from a maximum range of 7
meters, no more than 30 degrees off-axis from the front panel.
Direct sunlight or lighting (of an inverter type of
Change position of the main unit.
flourescent lamp etc.) is striking the remote
control sensor of the main unit.
Noise from nearby TV or tuner.
This unit is too close to the affected
Move the unit further away from the affected equipment.
equipment.
TROUBLESHOOTING