Interpreting Ocp Leds - DEC 4000 AXP Service Manual

Refer to Table 2–2 for information on interpreting the OCP LEDs and
determining what actions to take when a failure is indicated.
Figure 2–4 shows the module locations as they correspond to the LEDs.
Table 2–2 Interpreting OCP LEDs
Indicator Meaning
Futurebus+ 6–1 Remains lit if a Futurebus+
option has failed power-on
diagnostics.
MEM 3, 2, 1, 0 Remains lit if a memory module
has failed power-on diagnostics.
If no good memory is found, all
four memory LEDs may remain
lit even if there are less than
four memory modules present.
CPU 0, 1 Remains lit if a CPU module has
failed power-on diagnostics.
I/O Remains lit if the I/O module
has failed power-on diagnostics.
DC Power When lit indicates the proper
DC power is present. When
unlit, indicates no DC power is
present.
2–8 Power-On Diagnostics and System LEDs
Action on Error
Examine LEDs on the Futurebus+
options to determine which option
to replace.
Replace the failed module
(Chapter 5).
Replace the failed module
(Chapter 5).
Replace the I/O module (Chapter 5).
If no DC power is indicated, set
the DC on/off switch to on (1) and
examine the power supply LEDs.