Yamaha PSR-S770, Service Manual

Page: 44 / 110

44
PSR-S770/PSR-S970
LCD■display
Test■items■and■judging■conditions
026 : SIOF Check Checks whether the two SIOF circuits, which are defined Line-A and Line-B in this test, are connected
properly. Also, checks whether the control ports of AUDIO clock are connected properly.
1) Press the [START/STOP] button to start the test of Line-A and AUDIO-clock ports.
“
Line-A
” is shown on the LCD.
If there is no problem, the beep of the A3 sine wave will be repeated from the L channel. The sound
is produced and “
ON ” appears on the LCD while the clock turns ON state. The sound stops and
“ OFF ” appears on the LCD while the clock turns OFF state.
If there is a problem, the A3 sound is produced continuously and “
ON
” appears on the LCD, or no
sound is there and “
OFF
” appears on the LCD.
2) Press the TAB [
>
] button to start the test of Line-B and AUDIO-clock ports.
“ Line-B ” is shown on the LCD.
If there is no problem, the beep of the C5 sine wave will be repeated from the R channel. The sound
is produced and “
ON
” appears on the LCD while the clock turns ON state. The sound stops and
“ OFF ” appears on the LCD while the clock turns OFF state.
If there is a problem, the C5 sound is produced continuously and “ ON ” appears on the LCD, or no
sound is there and “
OFF
” appears on the LCD.
3) Press the [START/STOP] button to stop the sound and to exit the TEST item.
NOTE:
You can check the Line-A and Line-B alternatively by using the TAB [
<
][
>
] buttons.
028■:■AUX-IN■Check Checks whether the AUX IN jack works properly or not.
1) Press the [START/STOP] button. “ Not■Inserted ” is shown on the LCD.
2) Connect the plug to the AUX IN jack. “ Inserted ” is shown on the LCD.
3) Disconnect the plug. “
Not■Inserted
” is shown on the LCD.
4) Press the [START/STOP] button to exit the TEST item.
030 : MIC Check Checks whether the MIC/GUITAR INPUT jack works properly or not.
1) Press the [START/STOP] button. “ Not■Inserted ” is shown on the LCD.
2) Connect the plug to the MIC/GUITAR INPUT jack. “ Inserted ” is shown on the LCD.
3) Disconnect the plug. “
Not■Inserted
” is shown on the LCD.
4) Press the [START/STOP] button to exit the TEST item.
031■:■SW,■LED■Check Checks whether each panel button with its LED (if available) works properly or not.
1) Press the [START/STOP] button to start the test.
“
Push■
＊＊＊
” is shown on the LCD. The LCD shows you the should-be-pressed button.
NOTE:
The “
＊＊＊
” means each button name.
2) Press the button specified on the LCD one by one.
If the correct button is pressed, “
＊＊＊
■On ” is shown on the LCD and the sound of the note
assigned to the pressed button will be produced. Also, the LED (if available) lights. Regarding what
note and LED are assigned, refer to the Switch Test Sequence on page 51.
NOTE:
• “
NG■[pressed■button■name]■On
” will be shown on the LCD if the wrong button is pressed.
• “
Over■Two■Sw
” will be shown on the LCD if two or more buttons are pressed.
3) After all the buttons are completed and “ Dial■DOWN■50 ” appears on the LCD, check the
[DATA ENTRY] dial. Rotate the dial counter-clockwise until “ Dial■UP■xx ” appears on the LCD.
4) Rotate the dial clockwise until “
End
” appears on the LCD.
5) Press the [START/STOP] button to exit the TEST item.
NOTE:
You can exit this test by pressing the lowest key. Also, you can exit the test by pressing the [ASSIGN]
button after the button is tested.