Sun Oracle 4540 - Phaser Copystation, Service Manual, Page: 117 / 264

Chapter 2 Powering On and Configuring BIOS Settings 2-83
Note – The hard rst jumper changes the reset button from a soft reset to a hard reset.
It is used for hardware debugging only.
2.18 Using the Clear CMOS Jumper
You can use this jumper to clear the server’s CMOS settings in the case of a system
hang. For example, if the server hangs because of incorrect settings and does not
boot, use this jumper to invalidate the settings and reboot with defaults.
Note – Clearing CMOS settings resets the BIOS settings, including the BIOS
password.
1. Shut down the server to standby power mode by using a ballpoint pen or other
nonconducting stylus to press and release the recessed Power button on the
front panel.
See “Powering Off the Server” on page 2-3 .
2. Disconnect the AC power cords from the server.
Caution –
Before handling components, attach an antistatic wrist strap to bare metal
on the chassis. The system’s printed circuit boards and drives contain components
that are extremely sensitive to static electricity.
3. Remove the cable management assembly if necessary:
■
Sun Cable Management Assembly Installation Guide for the Sun Fire X4540 Server
■
Sun X4500-J Slide Rail Installation Guide (X4500)
■
“Early-Production Slide Rail and CMA Information” on page G-1 (X4500)
4. Remove the system controller as described in “To Remove the System Controller
(CRU)” on page 3-70 .
5. Push the system controller cover toward the rear and lift the cover off.
See the CPU board and the I/O controller board, as shown in
FIGURE 2-7
(X4500) or
in
FIGURE 2-8
(X4540).
6. Install the jumper across the header pins labelled Clear CMOS.
The jumper’s function is to tell the system to clear the current CMOS settings at
system reboot.