Troubleshooting - Yamaha DSP-A990 Operation Manual

PROBLEM
Power does not come on.
Hum.
No sound.
No sound from the effect speakers.
No sound from the front 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.
The sound field cannot be recorded.
Noise from nearby TV or tuner.
Continuous functions such as volume are
learned, but operate only for a moment
before stopping.
The sound is degraded when monitoring is
performed by using the headphones
connected to the compact disc player or
cassette deck which are connected with
this unit.
The remote control unit does not function
properly.
The remote control unit cannot learn a new
function from another remote control unit.

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 FRONT MIX switch is set to "ON".
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.
It is not possible to record the sound field on a
tape deck connected to this unit's TAPE REC
OUT jacks.
This unit is too close to the affected equipment.
Learning process incomplete.
The power to this unit is off.
Dead batteries.
Wrong distance or angle.
Direct sunlight or lighting (of an inverter type of
flourescent lamp etc.) is striking the
remotecontrol sensor of the main unit.
Memory is full.
There may occasionally be instances in which,
due to the signal-coding and modulation systems
employed by another remote control unit, that this
remote control unit will not be able to learn its
signals.
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 it on.
Use a different sound field program.
Set the FRONT MIX switch to "OFF".
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.
Move the unit further away from the affected equipment.
Be sure to press and hold the function key on the other remote
control until the TRANSMIT/LEARN indicator is extinguished.
Turn the power to this unit on.
Replace batteries.
The remote control unit will function from a maximum range of 6
meters, no more than 30 degrees off-axis from the front panel.
Change position of the main unit.
Erase unnecessary functions.
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