Yamaha LS9 Service Manual page 124

LS9-16/LS9-32
1-1 CPU SRAM test
Contents: Checks the address data bus line and data bus line of
SRAM on CPU circuit board.
Example of executing screen
Explanation in case the check result is NG
NG: SRAM A[X] (0xXXXXXXXX) W:XXXXXXXX–R:XXXXXXXX
CPU Address
Address bus number which is not acceptable
NG: SRAM D[X] W:XXXXXXXX–R:XXXXXXXX
write data
Data bus number which is not acceptable
1-2. CPU SDRAM test
Contents: Checks the address data bus line and data bus line of
SDRAM on CPU circuit board.
Example of executing screen
Display in case the check result is NG
NG: SDRAM ADDRESS BUS Ax
Address bus number which is not acceptable
NG: SDRAM DATA BUS Dx
Data bus number which is not acceptable
124
If the address bus is NG
write data read data
If the data bus is NG
read data
If the address bus is NG
If the data bus is NG
1-3. BATT test
Contents: C h e c k s t h e v o l t a g e o f t h e b a c k u p b a t t e r y
automatically by measuring it in A/D.
Example of executing screen
Comments on the results indication
The chart shows the example of the battery in normal conditions
Voltage Display in the right window
NG: BATT NONE
Less than 0.5[V]
From 0.5[V] less than 2.5[V] NG: x xxV (BATT Low)
From 2.5[V] less than 3.5[V]
OK: x.xxV
NG: x xxV (BATT High)
3.5[V] or above
1-4. RTC test
Contents: Obtains and sets Real Time Clock.
Example of executing screen
1) Dialog box of Set Date Time
Remarks
No battery set
The voltage is lower than
the specified value.
The voltage is lower than
the specified value.