Sharp ER-A530 CPU Internal RAM Test, AD Conversion Port Test, 16POLE Display Test, Flash ROM Test

13)CPU INTERNAL RAM TEST

1Key operation

122 3 CA/AT

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.

15)AD CONVERSION PORT TEST

1Key operation

160 3 CA/AT

2Test procedure

The test program displays the voltage of each AD conversion port.

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.

Display

OP display

Repeat OP display

OP display

T	M					=	S	R	V
1	6	0
V	R	F				=	S	R	V
1	6	0
V	P	T	E	S	T	=	S	R	V
1	6	0

Addresses to be checked:

01000H, 01001H, 01002H, 01004H, 01008H 01010H, 01020H, 01040H, 01080H, 01100H, 01200H, 01400H, 01800H, 02000H

3End of testing

You can exit the test mode by pressing any key. The printer prints the following.

1 6 0

OP display

C

P

U

R

A

M

S

R

V

16)POLE DISPLAY TEST

1

2

2

UP-P16DP is attached in DISPLAY CN.

3 Check:

1 Key operation

The completion print.

400 3

CA/AT

4 End of testing

2 Test procedure

The test program ends after printing.

Displayed in the following procedure A test pattern.

Progresses to the following pattern by pushing arbitrary KEY.

When the test ends normally:

122

i )

The following test pattern is displayed.

When the test ends abnormally: Ex – ~ –

122

*****

DOT DISPLAY

: 0 1 2 3 4 5 6 7 8 9 ; A a B b C

x = 1: Data error

7SEG DISPLAY

: 0 . 1 . 2 . 3 . 4 . 5 . 6 . 7 . 8 . 9 . - .

x = 2: Address error

c c c c c c c c c c c

If an error occurs, the printer outputs the error

message and the

ii)

The test pattern of all beam all-points lights is displayed.

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

3 Check:

14) FLASH ROM TEST

A) The display of each position is right.

1 Key operation

B) Be uniform in the luminosity of each display and there needs to

be no MURA in it.

130 3

CA/AT

4 End of testing

2 Test procedure

You can exit the test mode by pressing any key. The printer prints

The test program checks that the checksum of the flash ROM

the following.

(F00000H ~ FFFFFH).

4 0 0

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

OP display	F	L	A	S	H	R	O	M	S	R	V
	1	3	0

3Check: The completion print.

4End of testing

The test will automatically be terminated and the printer prints as follows:

When the test ends normally:		130
	ROM	******** (Model name)
		******** (Version)
When the test ends	E – – ~ – –	130
abnormally:
	ROM	******** (Model name)
		******** (Version)

17) RS232 CH1 TEST

Install the RS232 loopback connector.

1Key operation

500 3 CA/AT

2Test procedure

The test program checks the control signals.

OUTPUT				INPUT
/ER1	/RS1	/DR1	/CI1		/CD1	/CS1
OFF	OFF	OFF	OFF		OFF	OFF
OFF	ON	OFF	OFF		ON	ON
ON	OFF	ON	ON		OFF	OFF
ON	ON	ON	ON		ON	ON

ER-A520U/ER-A530U DIAGNOSTIC PROGRAM

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