Ram Diagnostics; Standard Ram Check; Up-P02Mb2 Check - Sharp UP-3300 Service Manual

UP-3300 Diagnostics V1.0A
Product & Test Diag
RAM Diag
ROM & SSP Diag
Clock & Clerk Diag
Touch Panel Diag
Serial I/O Diag
LCD Diag
SRN Diag
WARNING: "Product & Test Diagnostics" is used only in the
production process, and must be not used in servic-
ing.

3-2. RAM Diagnostics

This diagnostics is used to test the standard RAM and the expansion
RAM.
The following menu is displayed. Press the touch key for the of the
operation you want to execute to execute individual Diag programs.
Pressing the CANCEL key returns the screen to the Diag MAIN
menu.
RAM Diagnostics

Standard RAM Check

UP-P02MB2 Check

1) Standard RAM Check
Check content
For the pseudo SRAM of the standard RAM 1MB, the following
check is performed. The memory contents will not be changed by
this check.
The following processes are performed for the memory address
(700000H ∼ 7FFFFFH) to be checked.
PASS1: Memory data save
PASS2: Data "0000H" write
PASS3: Data "0000H" read/compare, data "5555H" write
PASS4: Data "5555H" read/compare, data "AAAAH" write
PASS5: Data "AAAAH" read/compare
PASS6: Memory data writed the saved data
In case of a compare error in the check sequences of PASS1 ∼
PASS6, an error display is made. If there is no error at all, the
check is normally terminated.
In addition, the following address check is performed.
In case of an error, an error display is made and read/write of the
address where the error occurred is repeated.
IrDA Diag
Drawer Diag
Rear Display Diag
MCR Diag
Printer Diag
Cancel
Cancel
Check point address = 700000H, 700001H
Display
Standard RAM Check
Standard memory size: 1024KB PASS!!(or ERROR!!)
Error Address
Write Data
Read Data
The error address and the bit are displayed only when the error
occurs. (If the error does not occur, the error address will not be
displayed.)
!
Terminating procedure
After completion of check, press the Touch panel.
2) UP-P02MB2 Check
Check content
The UP-P02MB2 presence check is performed in the following
procedure. The memory contents will not be changed by this
check.
•
55AAH is written into 9FFFFEH.
•
9FFFFEH is read and compared with 55AAH. If the both data
are correct, the following procedure is performed. If not, "Ex-
tended RAM size: 0KB" is displayed and the check is termi-
nated.
For the UP-P02MB2, the following check is performed.
The following processes are performed for the check address
(800000H ∼ 9FFFFFH).
PASS1: Memory data save
PASS2: Data "0000H" write
PASS3: Data "0000H" read/compare, data "5555H" write
PASS4: Data "5555H" read/compare, data "AAAAH" write
PASS5: Data "AAAAH" read/compare
PASS6: Memory data writed the saved data
In case of a compare error in the check sequences of PASS1 ∼
PASS6, an error display is made. If there is no error at all, the
check is normally terminated.
In addition, the following address check is performed in the above
check sequence.
In case of an error, an error display is made and read/write of the
address where the error occurred is repeated.
Check point address = 800000H, 800001H
6 – 2
700002H, 700004H
700008H, 700010H
700020H, 700040H
700080H, 700100H
700200H, 700400H
700800H, 701000H
702000H, 704000H
708000H, 710000H
720000H, 740000H
780000H
xxxxxxH
xxxxH
xxxxH
800002H, 800004H
800008H, 800010H
800020H, 800040H
800080H, 800100H
800200H, 800400H
800800H, 801000H
802000H, 804000H
808000H, 810000H
820000H, 840000H
880000H, 900000H