NEC PowerMate Pro150 Series Service Manual page 113

4-10 Maintenance and Troubleshooting
Problem
Hard disk
malfunction (cont'd)
Memory
malfunction
Sound malfunction
Keyboard or mouse
malfunction
Monitor
malfunction
Table 4-4 Problems and Solutions
Symptom
Cannot access hard disk.
Total memory is not
recognized.
No output from both the 8-bit
and 16-bit digitized sounds.
Monitor has prompt, but
cannot input data.
Unable to synchronize
display.
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.
1. Check that keyboard/mouse is plugged
in.
2. Check password (see Section 2).
3. Disable password (see Section 2).
4. Replace keyboard (or mouse).
5. Replace system board.
1. Adjust the monitor's synchronization
controls.
2. Check that the monitor's resolution
matches the video setting or the video
driver used (see Section 1).
3. Check that the utility is not selecting a
refresh rate/resolution that is not
supported by the monitor.
4. Check that the driver used matches the
capabilities of the video board and
DRAM.