Chapter 5. Diagnostics Specifications - Sharp UP-600 Service Manual

CHAPTER 5. DIAGNOSTICS SPECIFICATIONS

1. GENERAL DESCRIPTION
This Diag Program consists of a number of Diag. programs for the
UP-600, which facilitate the PWB check, process check and the op-
eration check of the system during servicing.
The Service Diag. programs are all contained in the standard ROM.
2. SYSTEM COMPOSITION
UP-600 only
UP-600
Fig 2-1. Service
3. DIAG.
Starting the Diag. Program
The Diag. Program is written on the external ROM, which is executed
by the CPU (H8/510) and runs on the following conditions:
The logic power supply is normal.
(+5V, VCKDC, POFF, +24V)
Both the I/O pins of the CPU and the CPU internal logic are
normal, and the CKDC9 and MPCA9, system bus, and standard
ROM/RAM are normal.
1) EXECUTING DIAG PROGRAM
To start the Diag. Program, enter the SRV mode. Select the option
item DIAGNOSTICS from the MENU using the cursor keys and press
the ENTER key.
The DIAG. MAIN MENU appears on the screen as shown below. The
cursor is displayed in reverse video and can be moved using the
up/down arrow keys. Move the cursor to the menu item you want and
press the ENTER key to execute the corresponding Diag. program.
When each Diag. program is completed, the screen returns to the
DIAG. MAIN MENU. Press the CANCEL key to exit the Diag. Pro-
gram and the screen returns to the SRV mode menu screen.
UP-600 DIAG V1.0A
PRODUCT&TEST
RAM&ROM&SSP
CLOCK&KEY&SWITCH
SERIAL I/O
DISPLAY&PRINTER
MCR&DRAWER
TCP/IP
2) RAM & ROM & SSP DIAGNOSITCS
This program tests the standard RAM, expanded RAM, standard and
service ROMs, and SSp circuit. RAM&ROM&SSP is selected on the
MAIN MENU, the following sub-menu screen appears. The cursor
shown in reverse video can be moved using the up/down arrow keys.
Move the cursor to the menu item you want and press the ENTER
key to execute the corresponding program. Press the CANCEL key to
return the screen to this submenu.
RAM&ROM&SSP DIAG
Standard RAM Check
UP-S04MB Check
UP-S02MB Check
Standard ROM Check
Service ROM Check
SSP Check
2)-1. Standard RAM check
Checking
The program performs the following checks on the standard
512KB of RAM. Data in memory remains unchanged before and
after the checks.
The following operations are performed for the memory addresses
to be checked (780000H - 7FFFFFH).
PASS1 : Save data in memory
PASS2 : Write data "0000H"
PASS3 : Read and compare data "0000H" and write data "5555H".
PASS4 : Read and compare data "5555H" and write data "AAAAH"
PASS5 : Read and compare data "AAAAH"
PASS6 : Return data into memory
If any comparison is not normal during the check sequence from
PASS 1 through 6, the error message appears.
If any error is not found up to the final address, the sequence
ends normally.
Then, another round of address checks is carried out using the
above check sequence
If an error occurs, the error message appears and the check
stops. The read/write of the address where the error occurs is
repeated.
Check point address = 780000H, 780001H
780002H, 780004H
780008H, 780010H
780020H, 780040H
780080H, 780100H
780200H, 780400H
780800H, 781000H
782000H, 784000H
788000H, 790000H
7A0000H, 7C0000H