Yamaha PSR-S770, Service Manual

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42
PSR-S770/PSR-S970
LCD■display
Test■items■and■judging■conditions
015■:■Output■R■Check Checks each output level from the R channel of the jacks.
1) Connect the level meter to an output jack.
2) Set the [MASTER VOLUME] control to the maximum position.
3) Press the [START/STOP] button to produce the C5 sine wave sound.
4) Measure the output level and confirm that the measured values are within the specified range.
[PHONES] (33
W
load)
PHONES L: -56.0 dBu or less PHONES R: -0.34 ± 2 dBu
[OUTPUT] (10k
W
load)
L/L+R; -60.0 dBu or less R: +5.3 ± 2 dBu
* When disconnecting the plug from the OUTPUT R jack, the sound is produced from OUTPUT L/
L+R jack.
* When disconnecting the plug from the PHONES jack, the sound is produced from the speaker.
5) Press the [START/STOP] button to stop the sound and to exit the TEST item.
016■:■Output■L■Check
Checks each output level from the L channel of the jacks.
1) Connect the level meter to an output jack.
2) Set the [MASTER VOLUME] control to the maximum position.
3) Press the [START/STOP] button to produce the C5 sine wave sound.
4) Measure the output level and confirm that the measured values are within the specified range.
[PHONES] (33
W
load)
PHONES L: -0.34 ± 2 dBu PHONES R: -56.0 dBu or less
[OUTPUT] (10k
W
load)
L/L+R: +5.3 ± 2 dBu R: -60.0 dBu or less
* When disconnecting the plug from the PHONES jack, the sound is produced from the speaker.
5) Press the [START/STOP] button to stop the sound and to exit the TEST item.
017 : EQ Low Check
(PSR-S770 only)
Checks the low-frequency sound.
1) Press the [START/STOP] button to produce the C1 sine wave sound.
2) Press the [START/STOP] button to stop the sound and to exit the TEST item.
018 : EQ Mid Check
(PSR-S770 only)
Checks the middle-frequency sound.
1) Press the [START/STOP] button to produce the C4 sine wave sound.
2) Press the [START/STOP] button to stop the sound and to exit the TEST item.
019 : EQ High Check
(PSR-S770 only)
Checks the high-frequency sound.
1) Press the [START/STOP] button to produce the C7 sine wave sound.
2) Press the [START/STOP] button to stop the sound and to exit the TEST item.
020 : MultiAMP Low Check
(PSR-S970 only)
Checks whether the multi-amplifier on the LOW frequency side work properly or not.
1) Press the [START/STOP] button to produce the 1kHz sine wave sound.
2) Check that the sound is produced from the right and left woofers.
3) Press the [START/STOP] button to stop the sound and to exit the TEST item.
021 : MultiAMP Hight Check
(PSR-S970 only)
Checks whether the multi-amplifier on the HIGH frequency side work properly or not.
1) Press the [START/STOP] button to produce the D#7 sine wave sound.
2) Check that the sound is produced from the right and left tweeters.
3) Press the [START/STOP] button to stop the sound and to exit the TEST item.
022■:■SP■MUTE■Check Checks whether the SP MUTE for the Speakers works properly or not.
1) Press the [START/STOP] button to produce the C5 sine wave sound. “ OFF ” is shown on the LCD.
2) Press the TAB [
>
] button to activate the SP MUTE circuit.
“
ON
” is shown on the LCD and the speakers are muted.
3) Press the TAB [ < ] button to cancel the SP MUTE circuit.
“ OFF ” is shown on the LCD and the C5 sound is produced.
4) Press the [START/STOP] button to stop the sound and to exit the TEST item.
Caution:
While this test is executed, connection/disconnection of the headphone is not detected. (Sound comes
out of the speaker even if the headphone is connected.)