Yamaha DSP -A780 Operation Manual: Troubleshooting

Digital sound field processing amplifier.
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PROBLEM
Power does not come on.
Hum.
No sound.
No sound from the effect speakers.
No sound from the center speaker.
The sound suddenly goes off.
The volume level cannot be increased,
or sound is distorted.
DSP parameters or other settings on this
unit cannot be changed.
Left rear and right rear channels not
balanced in certain digital sound field
programs.
The sound field cannot be recorded.
The remote control unit does not function
properly.
Noise from nearby TV or tuner.

TROUBLESHOOTING

POSSIBLE CAUSE
AC cord not properly plugged in.
Bad cable connection.
Bad or incorrect input connection.
Incorrect input source selection.
The EFFECT switch is set off.
The DOLBY PRO LOGIC program is being used
with material not encoded with Dolby Surround.
The center mode is in "PHNTM".
Incorrect sound field program.
The protection circuit has activated because of
short circuit etc.
The power to the component connected to the
REC OUT jacks of this unit is off.
The "MEMORY GUARD" function is
set ON.
This is normal operation and is an exact
duplication of the actual data which was
measured for that particular hall etc.
It is not possible to record the sound field on a
tape deck connected to this unit's TAPE
REC OUT jacks.
Dead batteries.
Wrong distance or angle.
Direct sunlight or lighting (of an inverter type of
flourescent lamp etc.) is striking the remote
control sensor of the main unit.
This unit is too close to the affected
equipment.
WHAT TO DO
Carefully plug AC plug into outlet.
Firmly plug in all connection cables.
Check connections.
Select the appropriate input source with the input selector switch.
Press the EFFECT switch to turn on.
Use a different sound field program.
Select the appropriate center mode.
Select the appropriate program.
Turning the unit off and then on will reset the protection circuit.
Turn the power to the component on.
Turn the "MEMORY GUARD" OFF.
Replace batteries.
The remote control unit will function from a maximum range of 7
meters, no more than 30 degrees off-axis from the front panel.
Change position of the main unit.
Move the unit further away from the affected equipment.
37

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