Epson RC620 CU Manual page 184

Maintenance 6. Maintenance Parts Replacement Procedures
BIOS (1) Place a battery on the battery holder on
Backup Battery
(Normal)
Installation
NOTE

(2) Mount the CPU board.
(3) Connect the following items to the
NOTE

(4) Turn ON the Controller power and keep pressing the <Delete> key.
(5) Change the BIOS setting as below.
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the CPU board.
Push down the battery until it is firmly
secured with latch.
Make sure the latch is in the same state
as shown in the photo.
Refer to Maintenance: 6.4.1.1 CPU Board (Normal).
Controller.
Keyboard Mouse
Display Power plug
Connect the keyboard with PS/2 port of
the CPU board.
If you use the USB keyboard, connect
it with PS/2 port using PS/2 branch
cable (attached to the Controller).
BIOS window will be displayed.
Select the [Integrated Peripherals] from the Main menu.
Battery holder
Latch
RC620 Rev.8