Interpreting Diagnostic Led Indicator At Power-Up; Interpreting Diagnostic Led Indicator During First 30 Seconds After Power-Up (Firmware Initialization Period) - DEC Personal DECstation 5000 User Manual

Troubleshooting
13.6 Understanding the Powerup Self-Test Sequence and the LED Display
Table 13–4 Interpreting Diagnostic LED Indicator at Power-Up
LED Function
2 short flashes at power-up
LED stays off at Power-up
Table 13–5 Interpreting Diagnostic LED Indicator During First 30 Seconds After
Power-Up (Firmware Initialization Period)
LED Function
Off for less than 30
seconds after first two
flashes.
Off for more than 30
seconds after first two
flashes.
A continuous series of
long flashes occurs.
One long flash followed by
1 short flash
13–12 Troubleshooting
Meaning
Power-on indication set immediately after system
firmware begins execution. Indicates that:
1. System is receiving DC power at correct voltage levels.
2. Instructions can be fetched from system ROM via
TURBOchannel Read operations.
3. System processor is able to execute non-cached
instructions.
4. Processor can perform TURBOchannel write operations
to a register in the I/O CTRL ASIC that drives the power
supply LED.
Power supply, CPU, TURBOchannel option, system ROM,
or I/O CNTL ASIC could be at fault.
Meaning
Power-up self test in progress.
Some failure has been detected during
the power-up self-test that could not be
isolated.
Memory failed during firmware
initialization.
kbd (SERIAL.bus keyboard input) and
crt have been selected as the firmware
console devices: the system is configured
as a workstation.
Corrective
Action
None.
Check power
supply, swap
CPU, swap
base module.
Corrective Action
None
Swap base module and
/or CPU daughter card.
Remove all memory
SIMMs and retest
to determine if the
memory on the base
module or on a SIMMs
is faulty.
None.
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