NEC POWERMATE P - SERVICE MANUAL 1996 Service And Reference Manual page 113

Problem
Sound/fax/modem
board malfunction
Keyboard or mouse
malfunction
Monitor malfunction
Table Section 4-6 Problems and Solutions
Symptom
No output from both the 8-bit and
16-bit digitized sounds.
Monitor has prompt, but cannot
input data.
Unable to synchronize display.
Wavy display.
Blank display.
Maintenance and Troubleshooting
Solution
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 controller and WRAM on
the video board.
1. Check that the computer and
monitor are not near motors or
electric fields.
1. Check that built-in VGA or
optional video board, if installed,
is enabled (see Section 2).
2. Check that the monitor
power ON/OFF switch is ON.
3. Check cable connections
between the AC power supply
and monitor.
4. Adjust brightness and
contrast controls on the monitor.
4-9