NEC POWERMATE PROFESSIONAL - SERVICE MANUAL 05-1997 Service Manual page 146

4-14 Maintenance and Troubleshooting
Problem
Hard disk
malfunction
Memory
malfunction
Sound malfunction
Keyboard or mouse
malfunction
Table 4-4 Problems and Solutions
Symptom
Hard disk drive lamp does not
light but hard disk drive can
be accessed.
Hard disk controller failure
message displayed.
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.
Solution
1. Check cable connections between
lamp and system board.
1. Check that the IDE port and hard disk
drives are enabled in Setup.
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.