Sun Microsystems Ultra 5, Service Manual

Page: 165 / 258

Chapter 8 Motherboard and Component Replacement 8-19
1. Using long-nose pliers, set the motherboard serial port jumpers JP3 and JP4 (refer
to the following table).
Note –
Motherboard jumpers are identified as JP. Jumper pins are located
immediately adjacent to the part number.
FIGURE 8-9
Identifying Jumper Pins
2. Replace the motherboard as follows (
FIGURE 8-7
and
FIGURE 8-8
):
a. Replace the motherboard as follows:
Caution – Handle the motherboard by the back panel or the edges only.
i. Position the motherboard into the chassis.
ii. Using a No. 2 Phillips screwdriver, replace the seven screws securing the
motherboard to the chassis (including the CPU standoff screw).
iii. Connect the external cables.
b. Replace the following:
i. PCI riser board and support
TABLE 8-2
Serial Port Jumper Settings
Jumper Pins 1 + 2 Select Pins 2 + 3 Select
Default Shunt
on Pins
JP3 RS-232 RS-423 2-3
JP4 RS-232 RS-423 2-3
Closed
Open
2-3
1
1-2
1