Sun Microsystems Enterprise 3500 System Reference Manual page 88

5.1 Handling Boards and Assemblies
Caution – The chassis AC power cord must remain connected to ensure a proper
ground.
Caution – The clock+ board and its modules have surface-mount components that
can be broken by flexing the board.
To minimize the amount of board flexing, observe the following precautions:
Transport the board in an antistatic bag.
Hold the board only by the edges near the middle of the board, where the board
stiffener is located. Do not hold the board only at the ends.
When removing the board from an antistatic bag, keep the board vertical until
you lay it on the Sun ESD mat.
Do not place the board on a hard surface. Use a cushioned antistatic mat. The
board connectors and components have very thin pins that bend easily.
Do not use an oscilloscope probe on the components. The soldered pins are easily
damaged or shorted by the probe point.
5.2 Clock+ Board
There is one clock+ board for each Enterprise 3500 system (
board provides:
Programmable system and processor clock
Serial, keyboard, and mouse ports for the console
NVRAM, which includes a centralized time-of-day (TOD) chip
Centralized reset logic
Status and control of power supplies
The clock+ board consists of the following subsystems:
ConsoleBus
Clocks
Reset logic
JTAG
Centerplane connector signals
5-2 Sun Enterprise 3500 System Reference Manual • August 2001
). The clock+
FIGURE 5-1