Sun Microsystems Netra t 1120, Service Manual

Page: 119 / 148

Chapter 10 Motherboard and Component Replacement 10-27
10.7.2 To Replace the Motherboard
Caution –
Use proper ESD grounding techniques when handling components. Wear
an antistatic wrist strap and use an ESD-protected mat. Store ESD-sensitive
components in antistatic bags before placing them on any surface.
1. Attach a wrist strap to the rear of the chassis.
See Section 7.1 “To Attach the Wrist Strap” on page 7-1
Caution –
Handle the motherboard by the handle, back panel, or the edges only.
2. Grasp the handle and the rear connector panel and slide the motherboard into the
chassis (See
FIGURE 10-11
on page 10-26).
3. Using long-nose pliers, set the motherboard serial port jumpers J2604 and J2605
(
TABLE 10-2
below and
FIGURE 10-12
on page 10-29).
Note –
Jumpers J2604 and J2605 can be set to either RS423 or RS232 serial interface.
The jumpers are preset for RS423. RS232 is required for digital telecommunication
within the European Community.
4. Using a No.2 Phillips-head screwdriver, tighten the three captive screws that
secure the motherboard to the rear of the chassis panel (see
FIGURE 10-10
on
page 10-25) starting with the centre screw.
5. Connect the external cables.
6. Populate the motherboard by replacing the following:
a. SIMMs.
See Section 10.5.2 “To Replace a SIMM” on page 10-19.
b. PCI card(s).
See Section 10.4.2 “To Replace a PCI Card” on page 10-15.
TABLE 10-2
Serial Port Jumper Settings
Port Jumper Pins 1 + 2 Select Pins 2 + 3 Select Default Shunt on Pins
ttya J2604 RS232 RS423 2 + 3
ttyb J2605 RS232 RS423 2 + 3
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