Sony GY-2120WD, Maintenance Manual

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6-15
GY-2120WD/WS
SYS CPU Block Check
a) ROM Check (Self-diagnosis command No. 22)
Enter “22” as a command number and press the ENTER key.
The sum of ROMs in a DRIVE CPU block is checked automatically.
DIAGNOSTIC=>22
-------[ ROM Check(SYS CPU) ]-------
ROM Check
********
OK
DIAGNOSTIC=>_
In case that the check succeeds;
Message “OK” is displayed.
In case that the check fails;
Message “ERROR!!” is displayed.
In this case, stop the GY-2120 operation immediately. Moreover, replace the MA-83 board which
mounts the ROM.
b) RAM Check (Self-diagnosis command No. 23)
Enter “23” as a command number and press the ENTER key.
The work memory of the SYS CPU is checked automatically.
DIAGNOSTIC=>23
-------[ RAM Check(SYS CPU) ]-------
RAM Check ******** OK
DIAGNOSTIC=>_
In case that the check succeeds;
Message “OK” is displayed.
In case that the check fails;
Message “ERROR!!(error count:xxxxxxxx)” is displayed.
“xxxxxxxx” indicates the number of error words.
6-2. Command Description