ER-A450S (serv.man5). Service Manual - Sharp ECR Service Manual (repair manual). Page 35

Perform the following check for the standard RAM 256 KByte SRAM.
The memory contents should not be changed before and after the
check.

Perform the following processes for memory address to be checked
(1C0000H~1FFFFFH).

PASS1: Save memory data.

PASS2:  Write data "0000H."

PASS3:  Read and compare data "0000H," write data "5555H."

PASS4:  Read and compare data "5555H," write data "AAAAH."

PASS5:  Read and compare data "AAAAH."

PASS6:  Restore the memory data.

If a compare error occurs in the check sequence PASS1-PASS6, an
error print is made. If no error occurs through all address, the check
ends normally.

The following address check is performed further.

Check point address =

1C0000H, 1C0001H, 1C0002H, 1C0004H
1C0008H, 1C0010H, 1C0020H, 1C0040H
1C0080H, 1C0100H, 1C0200H, 1C0400H
1C0800H, 1C1000H, 1C2000H, 1C4000H
1C8000H, 1D0000H, 1E0000H, 1F0000H

Check the termination printout.

The test terminates after printing the termination printout.

Termination printout:

 Normal termination

120 

  Abnormal termination

  Ex – – – – –

120 

                                 X = 1: Data check error

2: Address check error

Note: When an error occurs, the error print is performed and the

check is terminated. The error occurrence address is shown in
hexadecimal at positions shown with 

.

Sum check of the standard ROM (C00000H - C7FFFFH) is per-
formed. If the lower two digits of SUM is 10H, it is normal. 

Check the printout after the test.

The test automatically terminates with termination message.

Normal termination print

 

130 

 ROM1

27040

Error termination print

  E – – – –  

130 

 ROM1

27040

Note:  "

" means the ROM version number. 

The underlined section (10 bytes) of code table is provided in
the ROM as a standard and the table content is always
printed. 
The table position is the upper 10 digits of the ROM address.
The check sum correction address is the last address -0FH.

The digital conversion value of the input signal to the CPU A/D con-
vertor is displayed sequentially. The display channel is changes is
approx. 1 sec. interval by timer control and is displayed repeatedly.

Thermistor input

Vrf input: Vrf means the presumed voltage of VRF when VCC is

supposed to be +0.5V.

+24V input

Head input

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

decimal number.
Therefore, its connect may be 0000 

∼

 1024.

Check the display content.

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

JOB

#NO.

RAM NO.

Memory to be

checked

Address area to be

checked

200

Option RAM

ER-03RA

200000H 

∼

 27FFFFH

1

0

7-SEGMENT DISPLAY:

2

130

TL

1

0

7-SEGMENT DISPLAY:

3

151

TL

1

1

7-SEGMENT DISPLAY:

5

1

XXXX

1

1

7-SEGMENT DISPLAY:

5

2

XXXX

1

1

7-SEGMENT DISPLAY:

5

3

XXXX

1

1

7-SEGMENT DISPLAY:

5

4

XXXX

200

TL

5 – 5