ER-A570 (serv.man6). ERA570 Options Installation Manual - Sharp ECR Service Manual (repair manual). Page 9

The ER-A57R1 is the control ROM used for the following options of
the ER-A570.
The control ROM (ER-A57R1) must be installed when any of the
following options is used.
ER-A6IN:
ER-A5RS:

SRN inline I/F
RS232 I/F

Before working on the installation, turn off the power switch on the
ECR and unplug the AC cord from the AC outlet.
Also save the memory contents via the serial interface before pro-
ceeding to the installation work.

1) Remove the top cabinet.

2) Insert the control ROM in the IC socket ROM2 on the main PWB

(Fig. 1).

Fig. 1

1

Key operation:
400 

→

 TL 

2

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

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 

 O-ROM

27020

≅ ≅ ≅ ≅ ≅

 

≅ ≅ ≅ ≅ ≅

 

  E – – – – –

400 

 O-ROM

27020

≅ ≅ ≅ ≅ ≅

 

≅ ≅ ≅ ≅ ≅

 

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

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.

Note: In the case of the ER-ROM, the ROM version number is dis-

played in the upper and the lower stages.
In the case of the MASK-ROM (future specification), the MASK
ROM code is displayed in the upper stage, and the ROM
version number is displayed in the lower stage.

130

S-ROM 

   27040RAJ1A 

RAJ1A 

400

O-ROM   27020RAP1A 

RAP1A 

DOT DISPLAY :

R

M

O

O P T

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