Yamaha YDO-323 Service Manual page 29

No. Key Test item
9 F3 TG1 check
(Auto Scaling)
10 F#3 TG2 check
(Auto Scaling)
11 G3 Pitch check
12 G#3 Output Level R check
13 A3 Output Level L check
14 A#3 EQ-LOW frequency check
15 B3 EQ-MID frequency check
16 C4 EQ-HIGH frequency check
Test function and judgment criteria
The sine wave sounds from the low range in the key range (A0–E3) capable of sounding
while the sound production channel of the sound source is changed one after another.
(The sound stops after sounding of all 32 channels.)
Check that no abnormal sound or noise is generated.
When a key is pressed after Auto Scaling, the sine wave sounds. (Single sound, priority
on first-come)
Press the [DEMO/SONG] button to end this test.
The sine wave sounds from the low range in the key range (F3–C6) capable of sounding
while the sound production channel of the sound source is changed one after another.
(The sound stops after sounding of all 32 channels.)
Check that no abnormal sound or noise is generated.
When a key is pressed after Auto Scaling, the sine wave sounds. (Single sound, priority
on first-come)
Press the [DEMO/SONG] button to end this test.
Check that the sine wave of 440Hz ± 0.2Hz sounds at the level of specification (DAC
input full bit -12dB). (PAN = Center)
Connect the frequency counter to the [PHONES] jack for measurement.
When the test item is ended with the [DEMO/SONG] button, the sound stops.
Check that the sine wave of 1kHz sounds at the level specified below (DAC input full bit
-12dB). (PAN = R)
Connect a level meter (with JIS-C Filter) to the [PHONES] jack for measurement.
PHONES L: -40 dBu or less
When the test item is ended with the [DEMO/SONG] button, the sound stops.
Check that the sine wave of 1kHz sounds at the level specified below (DAC input full bit
-12dB). (PAN = L)
Connect a level meter (with JIS-C Filter) to the [PHONES] jack for measurement.
PHONES L: +0 dBu ± 2dB
When the test item is ended with the [DEMO/SONG] button, the sound stops.
Check that the sine wave of 65.4 Hz (C1) sounds at the level specified below (DAC input
full bit -12dB). (PAN = Center)
Connect a level meter (with JIS-C Filter) to CN6 of the MAEQ circuit board for
measurement.
MAEQ circuit board *CN6 (1-2, 3-4): + 15.5 dBu ± 2 dB
Dummy resistance: 4Ω (L ch/R ch)
When the test item is ended with the [DEMO/SONG] button, the sound stops.
Check that the sine wave of about 523 Hz (C4) sounds at the level specified below (DAC
input full bit -12dB). (PAN = Center)
Connect a level meter (with JIS-C Filter) to CN6 of the MAEQ circuit board for
measurement.
MAEQ circuit board *CN6 (1-2, 3-4): + 14.0 dBu ± 2 dB
Dummy resistance: 4Ω (L ch/R ch)
When the test item is ended with the [DEMO/SONG] button, the sound stops
Check that the sine wave of 4186 Hz (C7) sounds at the level specified below (DAC
input full bit -12dB). (PAN = Center)
Connect a level meter (with JIS-C Filter) to CN6 of the MAEQ circuit board for
measurement.
MAEQ circuit board *CN6 (1-2, 3-4): + 16.0 dBu ± 2 dB
Dummy resistance: 4Ω (L ch/R ch)
When the test item is ended with the [DEMO/SONG] button, the sound stops.
*CN6
PHONES R: +0 dBu ± 2 dB
PHONES R: -40dBu or less
1pin: L+ 2pin: L- 3pin: R+
YDP-323
4pin: R-
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