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Yamaha DSP-A1 Owner's Manual: Troubleshooting

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If the unit fails to operate normally, check the following points to determine whether the fault can be corrected by the simple
measures suggested. If it cannot be corrected, or if the fault is not listed in the SYMPTOM column, disconnect the power cord and
contact your authorized YAMAHA dealer or service center for help.
The unit fails to turn on when the
STANDBY/ON switch is pressed, or turns
into the standby mode suddenly soon after
the power is turned on.
It happens that this unit does not work
No sound or no picture.
No picture
The sound suddenly goes off.
Only one side speaker outputs the sound.
No sound from the effect speakers.
No sound from the front effect speakers.
No sound from the center speaker.
Poor bass reproduction.
Sound "hums".
The volume level is low while playing a
The volume level cannot be increased, or
sound is distorted.


Power cord is not plugged in or is not
completely inserted.
The IMPEDANCE SELECTOR switch on the
rear panel is not set to either end closely.
There is an influence of strong external
noise (lightning, excessive static electricity,
etc.) or a misoperation on this unit while
using this unit.
Incorrect output cord connections.
Appropriate input source is not selected.
Speaker connections are not secure.
Digital signals other than PCM audio and the
Dolby Digital (AC-3) (or the DTS) encoded
signals which this unit cannot reproduce are
input to this unit by playing a CD-ROM etc.
There is no S video terminal connection
between this unit and the TV, though S
video signals are input to this unit.
The protection circuit has been activated
because of short circuit etc.
The SLEEP timer has functioned.
Incorrect setting of the BALANCE control.
Incorrect cord connections.
The EFFECT button is set off.
A Dolby Surround (or DTS) decoding
program is being used with material not
encoded with Dolby Surround (or DTS).
The function "1E. FRONT MIX" in the SET
MENU mode is set to the "ON-5ch" position.
Normal or DTS DIGITAL SUR./Normal of
the DSP program No. 12 is selected.
The function "1A. CENTER SP" in the SET
MENU mode is set to the "NONE" position.
One of the DSP programs No. 1 to No. 6 is
selected when the input signal of source is
2-channel stereo (analog/PCM).
The input signals of source encoded with
the Dolby Digital (AC-3) or the DTS do not
have center channel signals.
The function "1D. LFE/BASS OUT" in the
SET MENU mode is set in the SWFR or
BOTH position, though your system does
not include a subwoofer.
Output mode selection for each channel
(MAIN, CENTER or REAR) is improper.
Incorrect cord connections.
No connection from the turntable to the
GND terminal.
The record is being played on a turntable
with an MC cartridge.
The component connected to the MD/TAPE
1 REC terminals of this unit is turned off.
Firmly plug in the power cord.
Set the switch to either end closely.
Turn this unit into the standby mode and
disconnect the AC power cord from the AC
outlet. After about 30 seconds have passed,
connect the power and operate this unit
Connect the cords properly. If the problem
persists, the cords may be defective.
Select the appropriate input source with the
Secure the connections.
Play a source whose signals this unit can
Connect this unit's S VIDEO MONITOR OUT
terminal to the TV's S video input terminal.
Turn this unit into the standby mode, and
then turn on to reset the protection circuit.
Cancel the SLEEP timer function.
Adjust it to the appropriate position.
Connect the cords properly. If the problem
persists, the cords may be defective.
Press the EFFECT button to turn it on.
Use a different sound field program.
Set to the "OFF-7ch" position.
Select another program (or subprogram).
Select the appropriate position.
Select another program.
Refer to the instructions for the source
currently played.
Select the MAIN position.
Make output mode selections suitable for
your speaker system.
Firmly connect the audio plugs. If the
problem persists, the cords may be defective.
Make the GND connection between the
turntable and this unit.
The player should be connected to the unit
through the MC head amplifier.
Turn on the power to the component.


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