Basic Troubleshooting For Boards; Disk Board Leds; Power Supplies - Sun Microsystems Enterprise 6500 Reference Manual

9.2.4

Basic Troubleshooting for Boards

If the yellow LED (middle LED) is continuously lit (not flashing) the board
requires service.
If the left and right green LEDs are off, the board is ready for removal.
If no LEDs are flashing, the system is hung.
If no LEDs are lit, there is no electrical power to the board.
9.2.5

Disk Board LEDs

The board status LED codes correspond to those shown in
CPU/Memory+ and I/O+ boards. The Disk board has two additional LEDs on the
opposite side of the board to show the status of the two onboard disk drives. The
LED for disk drive 1 is nearer to the side of the Disk board, and the LED for disk
drive 0 is closer to the center of the board.
9.2.6

Power Supplies

A system has one peripheral power supply and up to four or eight CPU/IO modular
power supplies. All the power supplies have one green LED and one yellow LED.
The control and status signals of all power supply modules connect to the clock+
board. If the clock+ board LEDs indicate a problem, inspect the LEDs on the power
supplies to locate a faulty module, if any.
9.2.6.1 Peripheral Power Supply (PPS)
The green LED is to the right of the yellow LED on the peripheral power supply. The
green LED indicates that the peripheral power supply is operating, but does not
necessarily indicate that the DC outputs are within specification.
When the peripheral power supply module yellow LED is lit, a DC power output
has malfunctioned or the voltage level is out of specification.
The peripheral power supply produces +5 VDC and +12 VDC current. The current is
available for peripherals such as a tape drive and/or CD-ROM drive. In addition,
the +5 VDC output of the peripheral power supply is available at the center plane
for current sharing with the +5 VDC outputs of the power supply modules.
9-6 Sun Enterprise 6500/5500/4500 Systems Reference Manual • April 1998
for the
TABLE 9-2