ER-A570 (serv.man6). ERA570 Options Installation Manual - Sharp ECR Service Manual (repair manual). Page 6

The following expansion RAM chips are available for the ER-A570.

ER-01RA:

32KB SRAM chip

ER-02RA:

128KB SRAM chip

ER-01MB:

Expansion RAM board
Standard 128K bytes
Max. 512K bytes (a maximum of three ER-02RA
RAM chips can be mounted on the RAM board.)

ER-02MB:

Expansion RAM board
1 M bytes

Note: Either the ER-01RA or the ER-02RA can be mounted on the

main PWB of the ER-A570. When installing the ER-01MB or
ER-02MB the ER-02RA must be mounted on the main PWB of
the ER-A570.

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

1) Remove the top cabinet.

2) Insert the expansion RAM chip onto the socket RAM2 on the main

PWB. (Fig.1, 2)

    <<ER-01RA>> : 28pins.

Fig. 1

    <<ER-02RA>> : 32pins.

Fig. 2

The number of pins are different between the ER-01RA (28 pins) and
the ER-02RA (32 pins). Observe the correct position for insertion of
the chip. (FIg.1, 2)

Fig. 3

3) Install the top cabinet.

4) Master reset the ER-A570.

5) Load the data in memory which had been saved.

6) Program reset the ER-A570.

2

1) Remove the top cabinet.

2) Mount the spacer 

1

 on the main PWB unit and place the ER-01MB

or ER-02MB expansion RAM board on the RAM connector and
the spacer. (Fig. 4)

Fig. 4

ER-01RA(28pins)

ER-02RA(32pins)

ER-02MB

ER-01MB

1

PSPAZ6706RCZZ

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