Read Sharp UP-800 (serv.man23) Service Manual online
UP-820N/820F (V)
DIAGNOSTICS SPECIFICATIONS
5 – 1
CHAPTER 5. DIAGNOSTICS SPECIFICATIONS
1. GENERAL DESCRIPTION
This diagnostics program is used to check the operations of the
UP-820N/UP-820F in a simplified method in the PWB inspection, the
process inspection, and servicing.
The diagnostics for the PWB inspection, the diagnostics for process
The diagnostics for the PWB inspection, the diagnostics for process
inspection, and the diagnostics for servicing are basically executed with
the flash ROM installed in the machine as a standard provision. ROM
data are written into the flash ROM by using the UKOG-2384RCZZ.
data are written into the flash ROM by using the UKOG-2384RCZZ.
2. SYSTEM COMPOSITION
3. DIAG
Starting the Diag Program
The Diag Program is written on the external ROM, which is executed
by the CPU (SH7760) and it runs on the following conditions:
by the CPU (SH7760) and it runs on the following conditions:
1 The logic power supply is normal.
2 Both the I/O pins of the CPU and the CPU internal logic are
normal,and the sub microcomputer for UP-820N/820F and FPGA,
system bus, and standard ROM/SRAM/SDRAM are normal.
When booting the machine for the first time, Perform calibration of the
touch key and the master reset.
When adding an option unit with the machine operating normally, per-
When adding an option unit with the machine operating normally, per-
form the program reset.
(1) Master reset operation
1 Turn OFF the power.
2 Set the RESET switch to the RESET position.
3 Turn ON the power.
4 While pressing a certain key (Journal key), set the RESET switch to
the normal position.
5 Perform the calibration operation.
6 (To the SRV mode screen) Perform the master reset.
(2) Program reset (SERVICE reset) operation
1 Turn OFF the power.
2 Set the RESET switch to the RESET position.
3 Turn ON the power.
4 Without pressing T/P or any key, set the RESET switch to the
normal position.
5 Perform the calibration operation.
6 (To the SRV mode screen) Perform the program reset.
3-1. EXECUTING DIAG PROGRAM
To boot the diagnostics program, select Diagnostics on the menu selec-
tion in the SRV mode. For the UP-800 series the diagnostics can be
executed and terminated by touching the display on the menu screen.
executed and terminated by touching the display on the menu screen.
Execution
:
2 4 1 3, and Total key or ENTER key
Termination
: Any key,
Interruption, cancel : CANCEL key
3-2. RAM DIAGNOSITCS
Used to check the standard RAM and an expansion RAM.
(1) Standard RAM check
1 Checking
For the standard SRAM (UP-800 series: 2MB),
the following checks are performed. The memory contents remain
the following checks are performed. The memory contents remain
unchanged before and after the checks.
The following processes are performed for the memory address to
be checked (0400 0000H-043F FFFFH).
be checked (0400 0000H-043F FFFFH).
PASS1: Memory data save
PASS2: Data “0000H” write
PASS3: Data “0000H” read and compare, data “5555H” write
PASS4: Data “5555H” read and compare, data “AAAAH” write
PASS5: Data “AAAAH” read and compare
PASS6: Memory data restoration
In case of a compare error in comparison of the check sequence
PASS1-6, the error display is made.
If no error occurs until the end of the last address, it is regarded as
normal completion.
normal completion.
The following address check is performed furthermore.
In case of an error, the error display is made and read/write opera-
tions at the error address are repeated.
tions at the error address are repeated.
Check point address = 0400 0000H 0400 0001H
0400 0002H 0400 0004H
0400 0008H 0400 0010H
0400 0008H 0400 0010H
0400 0020H 0400 0040H
0400 0080H 0400 0100H
0400 0200H 0400 0400H
0400 0200H 0400 0400H
0400 0800H 0400 1000H
0400 2000H 0400 4000H
0400 8000H 0401 0000H
0400 8000H 0401 0000H
0402 0000H 0404 0000H
0408 0000H 0410 0000H
2 Display
The error address and the bit are displayed only when an error
occurs. (If no error occurs, they are not displayed.)
3 How to exit the program
After displaying the check result, press the PANEL key or any key to
terminate the operation.
UP-820N/820F
UP-820N/820F
UP-820N/UP-820F main unit + various options
Connection diagram for servicing, the PWB
inspection, or the process inspection
inspection, or the process inspection
UKOG-2384RCZZ
Fig. 2-2 Connection diagram for writing ROM data
Fig. 2-1
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