Read Sharp UP-800 (serv.man23) Service Manual online
UP-820N/820F (V)
DIAGNOSTICS SPECIFICATIONS
5 – 3
2 Display
The error address and bit are displayed only when an error occurs
(They are not displayed if there is no error.)
3 How to exit the program
After displaying the check result, press the PANEL key or any key to
terminate the operation.
3-3. ROM DIAGNOSTICS
This diagnostics program is used to test the standard ROM and the ser-
vice ROM.
Touch a desired process to execute the individual diagnostics program.
When Cancel key is pressed, the screen returns to the diagnostics
menu.
(1) Standard ROM Check
1 Checking
For the standard ROM area (00000000H-003FFFFFH), the check
sum is checked to be correct. If the lower 2 digits of the check sum
is 40H, “Standard ROM Sum Check : PASS!!” is displayed. The
ROM version is also displayed. In case of a sum check error, “Stan-
ROM version is also displayed. In case of a sum check error, “Stan-
dard ROM Sum Check : ERROR!!” is displayed.
2 Display
3 How to exit the program
After displaying the check result, press the PANEL key or any key to
terminate the operation.
(2) SERVICE ROM Check
1 Checking
For the service ROM area composed of the 4 EPROM’s
(00400000H-007FFFFFH), addition is made to each byte of each
chip. If the check sum is 10H, it is normal. If the lower two digits of
chip. If the check sum is 10H, it is normal. If the lower two digits of
the check sum is 10H, “Service ROM Sum Check
*
: PASS!!” is
displayed. The ROM version is also displayed. In case of a check
sum error, “Service ROM Sum Check
sum error, “Service ROM Sum Check
*
: ERROR!!” is displayed.
If the head of the ROM version installed in each chip is neither
“27801R” nor “sample”, it is judged that no EPROM is installed and
sum check is not performed.
sum check is not performed.
2 Display
3 How to exit the program
After displaying the check result, press the PANEL key or any key to
terminate the operation.
3-4. CLOCK & CLERK DIAGNOSTICS
This diagnostics program is used to check the operation of the CKDC
clock crystal.
(1) Clock & Clerk Check
1 Checking
The operation of the CKDK clock crystal is checked.
The display section of “YY/MM/DD & MM:HH:SS” is renewed con-
tinuously. Check the renewed time. Also for the UP-800 series only,
the code of the key inserted into the clerk key switch is displayed in
the code of the key inserted into the clerk key switch is displayed in
hexadecimal number.
2 Termination method
When the panel or any key is pressed after displaying the check
result, the operation is terminated.
result, the operation is terminated.
3-5. TOUCH PANEL DIAGNOSTICS
This diagnostics program is used to check the touch panel.
Touch a desired process to execute the individual diagnostics program.
When Cancel key is pressed, the screen returns to the diagnostics
menu.
(1) Touch Panel Check
1 Check content
• For the panel input test, the dotted square is displayed at the four
corners of the LCD sequentially (right upper
3 left upper 3 left
lower
3 right lower). When each dotted square is touched, it
becomes a black square with a catch sound.
2 When all the four corners are touched, the operation is completed.
The operation is completed also by pressing Cancel key.
Touch Panel Diagnostics
Touch Cursor!!
Cancel
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