Yamaha YPT-370 Manual de serviço - Página 25

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2-5.
Test Program Item List
No.
Test Program Item
001
ROM version
004
RAM Check1
009
Pitch Check
011
Output level R Check
012
Output level L Check
Procedure for "Selection and execution of test items"
This shows the ROM version.
1)
Press the number [1] button. The version number of the main program is displayed
as shown below.
"*** Main" (***: Version)
Executes the simplified check of the RAM connected to the CPU bus.
1)
Check the test result.
If no problem is found, "Ram OK" is shown on the LCD.
If any problem is found, "Ram NG" is shown on the LCD.
Checks whether the correct pitch is output from this instrument.
1)
Before pressing the [START/STOP] button, connect the Frequency Counter to the
[PHONES/OUTPUT] jack on the rear panel. (Either L or R ch)
2)
Press the [START/STOP] button to produce the A3 sound.
3)
Check the Frequency counter indication.
No problem: the indication is with in 441.00 ± 0.2 Hz.
4)
Press the [START/STOP] button to stop the A3 sound. The LCD screen returns to
the test program selection display.
Checks whether the stereo R sound is output from the [PHONES/OUTPUT] jack
properly.
1)
Before pressing the [START/STOP] button, connect the level meter to the
[PHONES/OUTPUT] jack on the rear panel. (Both L and R ch, 33 Ω load)
2)
Set the MASTER VOLUME to the maximum position.
3)
Press the [START/STOP] button to produce the 1kHz sinusoidal sound.
4)
Check the output levels of L and R ch indicated on the Level meter.
No problem if the following conditions are satisfied.
[PHONES/OUTPUT] (33 Ω load)
• R: -18.5 dBu ± 2 dBu
• L: -75.0 dBu or less
5)
Press the [START/STOP] button to stop 1kHz sinusoidal sound. The LCD screen
returns to the test program selection display.
Checks whether the stereo L sound is output from the [PHONES/OUTPUT] jack
properly.
1)
Before pressing the [START/STOP] button, connect the level meter to the
[PHONES/OUTPUT] jack on the rear panel. (Both L and R ch, 33 Ω load)
2)
Set the MASTER VOLUME to the maximum position.
3)
Press the [START/STOP] button to produce the 1kHz sinusoidal sound.
4)
Check the output levels of L and R ch indicated on the Level meter.
No problem if the following conditions are satisfied.
[PHONES/OUTPUT] (33 Ω load)
• L: -18.5 dBu ± 2 dBu
• R: -75.0 dBu or less
5)
Press the [START/STOP] button to stop 1kHz sinusoidal sound. The LCD screen
returns to the test program selection display.
PSR-E373/YPT-370
25