Setting Jumpers - Sun Microsystems SPARCstation 5 Service Manual

3. Reconnect the DC power, SCSI data, diskette data, speaker/LED, and CD-ROM
audio cables to the system board.
See Figure 11–18.
4. Take the following components that you removed from the defective system
board and install them on the new system board:
a. NVRAM
b. DSIMMs
c. SBus cards
5. Detach the wrist strap and replace the cover.
See Chapter 7.
6. Reconnect all external cables to the rear panel.
7. Power on the system.
See "Powering On the System" on page 46.

Setting Jumpers

There are two serial port jumpers on the system board. The jumpers are factory-set to
RS423 mode (position B in Figure 11–23). The ports can be reset to RS232 mode
(position A) for connection to an X.25 network in Europe or Australia.
To change the jumper settings from RS423 mode to RS232 mode:
1. Shut down and power off the system.
See "Powering Off the System" on page 43.
2. Remove the cover and attach a wrist strap.
See Chapter 7.
3. Use needlenose pliers to move both serial port jumpers from position B
to position A.
See Figure 11–23.
SPARCstation 5 Service Manual ♦ Revision A, August 1994
122
See "Replacing the NVRAM Chip" on page 125.
See "Replacing a DSIMM" on page 115. Install the DSIMMs in the same
locations on the new system board.
See "Replacing an SBus Card" on page 105. Install the SBus cards in the same
locations on the new system board.