Epson Apex Ürün Destek Bülteni - Sayfa 28
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3. Carefully pull up and remove the CPU board and place the board on a static
free material with the component side up.
4. Insert the four RAM chips in the empty I.C. sockets marked U9, U10, U11, and
U12 on the memory board.
direction as the existing RAM chips with pin 1 toward the rear of the board.
Check to be certain that all chips are properly seated and that none of the pins
are bent.
Refer to Figure 2 for RAM chip locations and installation direction.
5. Reinstall the CPU board into the Apex motherboard (slot closest to the power
supply). Reconnect the 5 connectors and board retaining screw then install the
top cover.
6. Set the dip switches on the CPU board (See Section A- 3 of the User's Guide)
for 640KB. Switch 3 and 4 should be set in the off position. Also check the
other dip switch settings to make sure they have not been accidently changed
during the upgrade.
7. Power on the Apex system and check operation. The display should indicate
"640KB OK' upon initial self test.
Upgraded Apex CPU boards or Memory boards requiring service should be returned
with the factory memory configuration (512KB).
The Epson Limited Warranty covers the Apex computer product as purchased. It
does not cover failures caused by improper installation of circuit boards,
modifications, or failures due to components which are not factory installed.
Be sure to insert the RAM chips in the same
Figure 2
PSB No: S-0022A
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