ER-A490 (serv.man2). ERA490 Service Manual - Sharp ECR Service Manual (repair manual). Page 40

+24V input

Note: "XXXXX": The 10 bit data of the A/D convertor displayed in

decimal number.
Therefore, its connect may be 0000 

∼

 1024.

3

Confirmation
Check the display content.

4

Termination
To when the mode switch is set to any mode other than SRV
mode, the termination print is made and the test is terminated.

                        151

Test termination print

1

Key operation

200 or 201 

→

 TL 

JOB

#NO.

RAM NO.

Memory to be

checked

Address area to be

checked

200

Option RAM

ER-02RA

200000H 

∼

 21FFFFH

201

ER-03RA

200000H 

∼

 27FFFFH

2

Content
The following check are performed for the optional RAM.
The following process is performed for memory addresses  to be
checked. 

PASS1: memory data save
PASS2: Data "0000H" write
PASS3: Data "0000H" read and comparison, data "5555H" write
PASS4: Data "5555H" read and comparison, data "AAAAH" write
PASS5: Data "AAAAH" read and comparison
PASS6: Memory data restore

If a compare error is found in the check sequence from PASS1 to
PASS6, error print (error code E1) is performed. If there is no error
found to the end of the last address, the operation is completed
normally.

Then the following address check is performed. "

|

" shows a valid

address, and "

✕

" shows an invalid address.

In case of an error, error code E2 is printed.

Check Address

JOB#200

(ER-02RA)

JOB#201

(ER-03RA)

200000H

F

F

200001H

F

F

200002H

F

F

200004H

F

F

200008H

F

F

200010H

F

F

200020H

F

F

200040H

F

F

200080H

F

F

200100H

F

F

200200H

F

F

200400H

F

F

200800H

F

F

201000H

F

F

202000H

F

F

204000H

F

F

208000H

F

F

210000H

F

F

220000H

✕

F

240000H

✕

F

260000H

✕

F

3

Check the following items.
Check the termination print. 

4

Test termination
The test terminates after printing the termination printout. 

Termination print

E01---

200

(ER-02RA data check error)

E02---

200

(ER-02RA address check error)

*****

E01---

200

(ER-03RA data check error)

E02---

201

(ER-03RA address check error)

******

E01---

200

(ER-02RA normal end)

E02---

201

(ER-03RA normal end)

******

: Error address

1

Key operation:
400 

→

 TL 

2

Functional description:
A sum check is done for the option ROM (Address hex C80000H
thru C9FFFFH.)

3

Check the following items:
Check the termination printout.

4

Test termination:
The test terminates after printing the termination printout.

Termination printout

 Normal termination

400 

 ROM

27010@@@@@ 

@@@@@ 

      

  E – – – – –

400 

 ROM

27010@@@@@ 

@@@@@ 

       

The underlined section must be the same as the standard ROM
test specification. (Refer to JOB #130.)

1

5 1

2

7-SEGMENT DISPLAY:

V

R

=

S

DOT DISPLAY:

R V

* * * *

* * * *

F

1

5 1

3

7-SEGMENT DISPLAY:

V

P

=

S

DOT DISPLAY:

R V

* * * *

* * * *

2

7-SEGMENT DISPLAY:

4

0

7-SEGMENT DISPLAY:

O

- R O M

T S

S

DOT DISPLAY:

R V

*

– 38 –