Sun Microsystems 60 service manual Replacing a Motherboard, 2Serial Port Jumper Settings

10.7.2Replacing a 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.

Caution –Handle the motherboard by the handle, back panel, or the edges only.

Note –Jumpers J2604 and J2605 can be set to either RS-423 or RS-232 serial interface. The jumpers are preset for RS-423. RS-232 is required for digital telecommunication within the European Community.

1.Using long-nose pliers, set the motherboard serial port jumpers J2604 and J2605 (TABLE 10-2and FIGURE 10-9).

TABLE 10-2Serial Port Jumper Settings

			Default Shunt
Jumper	Pins 1 + 2 Select	Pins 2 + 3 Select	on Pins
J2604	RS-232	RS-423	2 + 3
J2605	RS-232	RS-423	2 + 3

Caution –Handle the motherboard by the handle, back panel, or the edges only.

2. Place the motherboard on an antistatic mat.

Chapter 10 Motherboard and Component Replacement 10-23