Yamaha PSR-S770, Руководство по обслуживанию

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PSR-S770/PSR-S970
LCD■display
Test■items■and■judging■conditions
004 : NAND ROM Check1
(PSR-S970 only) Executes the simplified check of the NAND ROM connected to the CPU bus.
1) Press the [START/STOP] button to start the test.
OK: OK
NG:
■NAND■ROM■(IC
＊＊＊
) NG
2) Confirm that “
OK
” is shown on the LCD.
3) Press the [START/STOP] button to exit the TEST item.
005■:■RAM■Check1 Executes the simplified check of the RAM connected to the CPU bus.
1) Press the [START/STOP] button to start the test.
OK:
OK
NG:
■MAIN■SDRAM■(IC
＊＊＊,＊＊＊
)■NG
2) Confirm that “ OK ” is shown on the LCD.
3) Press the [START/STOP] button to exit the TEST item.
006 : Backup ROM Check1
Executes the simplified check of the Backup ROM. (It will take about 4 seconds.)
1) Press the [START/STOP] button to start the test.
OK:
OK
NG: ■BACKUP■(IC
＊＊＊
) NG
2) Confirm that “ OK ” is shown on the LCD.
3) Press the [START/STOP] button to exit the TEST item.
007■:■Wave■ROM■Check1 Executes the simplified check of the Wave ROM.
1) Press the [START/STOP] button to start the test.
OK: OK
NG:
■Wave■(IC
＊＊＊,＊＊＊
)■NG
2) Confirm that “
OK
” is shown on the LCD.
3) Press the [START/STOP] button to exit the TEST item.
008 : Wave RAM Check1 Executes the simplified check of the Wave RAM.
1) Press the [START/STOP] button to start the test.
OK:
OK
NG:
■Wave■RAM■(IC
＊＊＊
) NG
2) Confirm that “ OK ” is shown on the LCD.
3) Press the [START/STOP] button to exit the TEST item.
009■:■Effect■RAM■Check1 Executes the simplified check of the Effect RAM.
1) Press the [START/STOP] button to start the test.
OK:
OK
NG: ■Effect■1■TG1■(IC
＊＊＊
)■NG
2) Confirm that “ OK ” is shown on the LCD.
3) Press the [START/STOP] button to exit the TEST item.
012 : IRQ Check
Checks whether the IRQ and DREQ communication between the Main CPU and SWP70 is executed
properly or not.
1) Press the [START/STOP] button to start the test.
OK: OK
NG:
NG■(IRQ
＊
)
2) Confirm that “
OK
” is shown on the LCD.
3) Press the [START/STOP] button to exit the TEST item.
014■:■Pitch■Check Checks whether the output from this instrument is correct pitch or not.
1) Connect the frequency counter to the PHONES jack at either L or R.
2) Set the [MASTER VOLUME] control to the maximum position.
3) Press the [START/STOP] button to produce the A3 sine wave sound.
4) Measure the frequency and confirm that the measured value is 440.943Hz ± 0.2Hz.
5) Press the [START/STOP] button to stop the sound and to exit the TEST item.