NEC POWERMATE CT 815 - RELEASE NOTES, Инструкция по обслуживанию и справочник

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7-6 Troubleshooting
Diagnostics
One beep indicates that the system has completed its POST test. If intermittent beeping occurs,
power off the system and try again. If the beeping persists, see the following table. The table
summarizes problems that may develop during system operation and lists (in sequential order)
suggested corrective actions.
Problems and Solutions
Problem Symptom Solution
No power Power lamp on computer
front panel does not light. 1. Check that the power cord is plugged into the
power socket on the computer and into a live,
properly grounded AC power outlet.
2. Check cable connections between the power
supply and system board and between the system
board and power switch.
3. Systematically eliminate possible shorted
PCBs by removing cables and expansion boards.
4. Check +5 and +12 power supply voltages.
Measure voltages with system board installed.
5. Replace the power switch assembly.
6. Replace the power supply.
7. Replace the system board.
Power supply
malfunction Any of the following
conditions could occur.
Front panel lamps out,
diskette and/or hard drives do
not spin, monitor blank,
interface ports not working,
and keyboard lamp out and/or
cannot input from keyboard.
1. Perform steps 1 through 4 listed in this table
under No Power.
2. Check power supply voltages. Voltages
should be measured with a load on them (system
board plugged in).
3. Replace the power supply.
Operating system
does not boot Intermittent beeping at power-
on. Computer beeps more
than once and is unable to
complete boot-up. 1. Check system configuration (see Section 2).
2. Check all jumper settings and verify that
drives are enabled (see Section 2).
3. Reseat DIMMs and option boards in their
connectors. Inspect system board for foreign
objects such as paper clips.
4. Remove option boards and reboot.
5. Replace system board.
“Invalid Configuration”
message displayed. 1. Press F2 to run Setup and correct the
parameters.
2. Replace the CMOS battery (see Section 3) if the
date and time must be set each time the system is
powered on.