Yamaha PSR-E473 Service Manual page 20

PSR-E473
3-5. Test Program Item List
No. Inspection items
001 ROM version
002 Memory Check 1 All
004 RAM Check1
006 Wave ROM Check1
009 Pitch Check
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Procedures for selection and execution of test items
This shows the ROM version.
1) Press the [START/STOP] button.
2) The version number of the main program is displayed.
"*** Main" (where *** is the version number)
3) Press the [START/STOP] button to return to the test item selection screen.
Executes a simplified check of all the memories (004- 006) at one time.
1) Press the [START/STOP] button.
2) Check the test result.
If no problem is found, "Mem1 OK" is shown on the LCD.
If any problem is found, "Mem1 NG" is shown on the LCD.
3) Press the [START/STOP] button to return to the test item selection screen.
Executes the simplified check of the RAM connected to the CPU bus.
1) Press the [START/STOP] button.
2) 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.
3) Press the [START/STOP] button to return to the test item selection screen.
Executes a simplified check of the Wave ROM connected to the CPU bus.
1) Press the [START/STOP] button.
2) Check the test result.
If no problem is found, "WRom OK" is shown on the LCD.
If any problem is found, "WRom NG" is shown on the LCD.
3) Press the [START/STOP] button to return to the test item selection screen.
Checks whether the correct pitch is output from this instrument.
1) Before starting the test, connect the Frequency Counter to the [PHONES] jack on
the rear panel. (Either L or R ch)
2) Press the [START/STOP] button. The A3 sound is produced.
3) Check the Frequency counter indication.
Specifications range: 441.00 ± 0.2 Hz
4) Press the [START/STOP] button to stop the A3 sound and return to the test item
selection screen.