Yamaha YDO-323 Service Manual page 31

No. Key Test item
45 B4 Flash ROM check 2
47 C5 Factory Set
48 C7 Test Mode Exit
Table 2 Switch test order
Oder Switch name LED to light up
1 DEMO/SONG
2 PIANO/VOICE
3 SELECT
4 REC
5 PLAY
6 METRONOME
Test function and judgment criteria
To check erase, write, read functions for all banks of Flash ROM
* Note that execution of this test causes all data in Flash ROM to be erased.
(a) Erase function check
Perform the erasing procedure to the entire Flash ROM and check if it is successful.
(b) Write function check
To check the full address checksum of Flash ROM
* Be careful not to turn off the power during the write function check.
(c) Final erasure
To erase the data written during (b) Write function check.
For the OK test result, the sine wave of C4 sounds (for 1 second).
For NG, the sine wave of C2 sounds (continuously until any key is pressed).
It takes 26 seconds before checking is completed.
Initialize all the backup areas so as to obtain the factory outgoing setting state. (RAM
and Flash)
* Note that all the data will be erased.
For the OK result, the sine wave of C4 sounds (for 1 second).
For NG, the sine wave of C2 sounds (continuously until any key is pressed).
* In this stage, the flag for initialization is raised only and initialization will be executed
when the power is turned on next time. After executing this factory setting, be sure to
execute Test No. 48 "Test Exit". Initialization of the memory is actually executed when
the program is restarted (RE BOOT). Once it is started, do not turn off the power until
LED flashing comes to an end.
It takes 8 seconds before checking is completed.
To end the test program and reset to the normal mode (for restarting).
Note No.
C3
D3
E3
REC F3
PLAY G3
A3
YDP-323
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