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 it 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.
When starting the SET for the first time, MASTER RESET the sys-
tem. If you want to add any OPTION UNIT when the SET is operating
normally, perform PROGRAM RESET.
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 screen as given below. 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
ENTER to execute the corresponding Diag. program. When each
Diag. program is completed, the screen returns to the DIAG. MAIN
MENU. Pres the CANCEL key to exit the Diag. Program and the
screen returns to the MENU screen in the SRV mode.
UP-600 DIAG V1.0A
PRODUCT&TEST
RAM&ROM&SSP
CLOCK&KEY&SWITCH
SERIAL I/O
DISPLAY&PRINTER
MCR&DRAWER
TCP/IP
The cursor moves along through the menu items by entering num-
bers with the numeric keypad. This allows you to reduce the number
of key operations. (Example: By entering the number 7, the cursor
moves to the menu item TCP/IP.) This method also applies to other
SUB MENUs.
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 submenu 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 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