Sun Microsystems 220R - Manual (Page 125)

3.16.2 What to Do
1. Locate the jumpers on the main logic board.
A main logic board jumper is identified by its jumper address, labeled on the
board with the letter “J” followed by four numbers (JXXXX). Jumper pins are
located immediately adjacent to the jumper address. On the board, pin 1 is
marked with an asterisk.
For information about jumper locations, see Section 3.15 “How to Set the Serial
Port Jumpers” on page 122.
2. Set the main logic board jumpers J2703 and J2804.
Using long-nose pliers, place a shunt over the appropriate pins according to the
following table.
Flash PROM
jumper A shunt on
pins 1 and 2
selects A shunt on
pins 2 and 3
selects The default
shunt is on
pins Signal that is
controlled
J2703 Write-protect Write-enable 1 and 2 FLASH PROM
PROG
ENABLE
J2804 High-half
booting Normal
(low-half)
booting 2 and 3 XOR LOGIC
SET
3.16.3 What Next
Complete the following task to reassemble the system:
4 Section 2.7 “How to Replace the System Cover” on page 67
Servicing the Main Logic Board and Components 125