Casio BN-10 Service Manual & Parts List page 33

2 SRAM MEMORY CHECK
Press 1 button, the following display appears.
SRAM CHECK
(128K)= OK
In case of abnormal S-RAM, NG display appears.
3 CHECK SUM
Press ESC, then 2 button. The following display appears.
ROM SUM
(CS8)= XXXX
(CS7)= XXXX
ROM shown to this display indicates LSI301.
4 BUS CHECK
Press ESC, then 3 button. The following display appears.
SRAM CHECK
(128K)= OK
ROM SUM
(CS8)= XXXX
(CS7)= XXXX
FLASH CHECK
(CS5)= 1M
XXX5
(CS4)= 1M
XXX4
" (CS5)= 1M" indicates that the flash ROM of memory capacity 1M byte is mounted on Main PC
board as LSI304. If this ROM is not mounted, "NC" is displayed instead of "1M".
" (CS4)= 1M" indicates that the flash ROM of memory capacity 1M byte is mounted on Main PC
board as LSI306. "NC" is displayed in stead of "1M" because this LSI306 is not mounted with
BN-10. "XXX44" is not displayed with BN-10 also.
"XXX5(4)"- If "OKF5(4)" is displayed, the flash ROM of LSI304(LSI306) is formatted and have
no memories. If "NGF5(4)" is displayed, the flash ROM of LSI304(LSI306) is not formatted and
have memories.
If "OKB5(4)" is displayed, the wiring interior the flash ROM of LSI304(LSI306) is normal and
steady. If "NGB5(4)" is displayed, the wiring interior the flash ROM of LSI304(LSI306) is abnor-
mal and unsteady.
5 SRAM WRITE CHECK
Press ESC, then 4 button. The following display appears.
SRAM WRITE
END
XXXXXXXX
BANKXX
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