Figure 9-16 Location Of The Motherboard Serial Port Jumpers; Table 9-3 Serial Port Jumper Settings - Sun Microsystems Ultra 80 Service Manual

1. Place the motherboard on an antistatic mat.
Caution – Handle the motherboard by the back panel or edges only.
2. Using long-nose pliers, set the motherboard serial port jumpers J2804 and J2805
(see the following table and figure).
TABLE 9-3
Jumper
J2804
J2805
Serial
port
jumpers
FIGURE 9-16
Note – Motherboard jumpers are identified with reference designations. Jumper
pins are located immediately adjacent to the reference designation. Pin 1 is marked
with an asterisk in any of the positions shown in the following figure. Ensure that
the jumpers are set correctly.
-34 Sun Ultra 80 Service Manual • March 2000
Serial Port Jumper Settings
Pins 1 + 2 Select
RS-232
RS-232
J4105 J4108
Bank 3
J2804
*
J2805
*
Bank 1
Location of the Motherboard Serial Port Jumpers
Default Shunt
Pins 2 + 3 Select on Pins
RS-423 2 + 3
RS-423 2 + 3
J4107
U1404
U1403
U1402
J4112
U1401
J4106