NEC POWERMATE VE - SERVICE MANUAL 05-1996 Service Manual page 99

Table Section 4-2 Problems and Solutions
Problem Symptom
Hard disk Cannot access hard disk.
malfunction (cont'd)
Memory Total memory is not
malfunction recognized.
Sound malfunction No output sounds.
Keyboard or mouse Monitor has prompt, but
malfunction cannot input data.
Monitor malfunction Unable to synchronize
display.
Maintenance and Troubleshooting
Solution
1. Check signal/power connections
between hard disk, PCB, power supply.
2. Check drive jumper settings.
3. Check power supply.
4. Check hard disk cable and hard disk.
Replace as necessary.
5. Replace system board (or hard disk
controller PCB if the system board
controller is not used).
1. Reseat SIMMs.
2. Systematically swap SIMMs.
3. Check to see if the SIMM configuration
is valid (see Section 3).
4. Replace SIMMs.
5. Replace system board.
1. Check interrupts. Refer to Section 1 for
interrupt settings.
2. Check DMA channels. Refer to
Section 1 for DMA channel settings.
3. Replace system board.
1. Check that keyboard/mouse is plugged
in.
2. Check password (see Section 2).
3. Disable password (see Appendix B).
4. Replace keyboard (or mouse).
5. Replace system board.
1. Adjust the monitor's synchronization
controls.
2. Check that the driver used matches the
capabilities of the video DRAM installed.
3. Check that the monitor's resolution
matches the video setting and supported
video drivers used (see Section 1).
4. Check that the utility is not selecting a
refresh rate/resolution that is not
supported by the monitor.
4-7