Sharp ER-A420 Manuel de service télécharger pdf (Page 19)

ER-A410U/ER-A420U DIAGNOSTIC PROGRAM

– 17 –

11) EXTERNAL RAM TEST

1 Key operation

120 3

2 Test procedure

The standard 256 Kbyte RAM is checked.

The contents of memory must be stored before and after this test.

RAM (08000H~7FFFFH area and 28000H~2FFFFH area) is tested

in the following procedure:

a) Store data in the test areas

b) Write “00H”

c) Read and compare “00H” and then write”55H”

d) Read and compare “55H” and then write “AAH”

e) Read and compare “AAH”

f) Restore stored data

If an error occurs at a step, the error is printed.

If any error does not occur, the following addresses are checked in

turns.

Addresses to be checked:

08000H, 08001H, 08002H, 08004H, 08008H, 08010H, 08020H,

08040H, 08080H, 08100H, 08200H, 08400H, 08800H, 09000H,

0A000H, 0C000H, 10000H, 18000H, 28000H (BANK 0),

28000H (BANK 3), 30000H, 40000H

3 Check:

A) The completion print.

4 End of testing

The program ends after printing as follows:

When an error occurs, the printer outputs the error message and the

address where the error has occurred in the area *****.

12) CPU INTERNAL RAM TEST

1 Key operation

121 3

2 Test procedure

The test program tests internal RAM (10 Kbytes) of the CPU.

The contents of memory must be stored before and after this test.

RAM (00400H ~ 02BFFH area) is tested in the following procedure.

a) Store data in the test area.

b) Write “00H”

c) Read and compare “00H” and then write “55H”

d) Read and compare “55H” and then write “AAH”

e) Read and compare “AAH”

f) Restore stored data

If an error occurs at a step, the error is printed.

If any error does not occur, the following addresses are checked

in turns.

Addresses to be checked:

01000H, 01001H, 01002H, 01004H, 01008H

01010H, 01020H, 01040H, 01080H,

01100H, 01200H, 01400H, 01800H,

02000H

3 Check:

The completion print.

4 End of testing

If an error occurs, the printer outputs the error message and the

address where the error has occurred in the area *****.

13) FLASH ROM TEST

1 Key operation

130 3

2 Test procedure

The test program checks that the checksum of the flash ROM

(BANK0F80000H ~ FFFFFH).

The lower two digits of the checksum should be 10H. (pending)

3 Check:

The completion print.

4 End of testing

The test will automatically be terminated and the printer prints as

follows:

When the test ends normally: 120

When the test end abnormally: Ex – ~ – 120

*****

x = 1: Data error

x = 2: Address error

CA/AT

RAM

SRV

OP display

120

The test program ends after printing.

When the test ends normally: 121

When the test ends abnormally: Ex – ~ – 121

*****

x = 1: Data error

x = 2: Address error

When the test ends normally: 130

ROM

********

(Model name)

********

(Version)

When the test ends

abnormally:

– – ~ – –

130

ROM

********

(Model name)

********

(Version)

CA/AT

RAMCPU

SRV

OP display

121

CA/AT

ROMFLASH

SRV

OP display

130

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Commentaires sur ces manuels

Chrisacend 30 Apr 2024 | 01:02:48

Hello, im noob :)

Sharp ER-A420 Manuel de service Page 19

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