1) Remove the rear cover (right).
Screws (3 pcs.)
Claws (2 pcs.)
2) Remove the controller plate.
Screws (3 pcs.)
3) Press the SW3 on the controller PCB and confirm LED10 has gone OFF. (This action is to cut the secondary power OFF.)
4) Release the 2 hooks to detach the 256MB RAM.
5) Insert the system upgrade memory in the slot where the 256MB RAM has been detached.
MEMO:
Be sure the upgrade memory has firmly been inserted and the hooks are in the hole of the memory as shown.
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6) Fix the controller plate with 3 screws (TP, M3x6).
7) Fix the rear cover (right) with 3 screws (RS-tight, M3x8).
8) Connect the power plug of the host machine to the power outlet and turn its main power switch ON.
9) Checking the Connection
9-1) Have the service mode display by pressing the following keys in order:

>2key>8key>

In response, [#SSSW] appears.
9-2) Use left or right cursor [< / >] key and press [OK] when [REPORT] has appeared.
9-3) Use left or right cursor [< / >] key and press [OK] when [REPORT OUTPUT] has appeared.
9-4) Use left or right cursor [< / >] key and press [OK] when [SPEC LIST] has appeared.
9-5) SPEC REPORT is printed out. Confirm TOTAL MEMORY is [512MB] on the report.