NEC POWERMATE ES 5200 - SERVICE, Service Manual

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Troubleshooting 8-9
Problems and Solutions
Problem Symptom Solution
Memory malfunction Total memory not recognized. 1. Reseat DIMMs.
2. Systematically swap DIMMs.
3. Check to see if the DIMM configuration
is valid (see Section 4).
4. Replace DIMMs.
5. Replace system board.
Modem board
malfunction No output from board. 1. Check interrupts (see Section 2).
2. Check DMA channels (see Section 4).
Keyboard or mouse
malfunction Monitor has prompt, but cannot
input data using keyboard or
mouse. 1. Check keyboard/mouse plugged in.
2. Check password (see sections 2, 4).
3. Disable password (see sections 2, 4).
4. Replace keyboard (or mouse).
5. Replace system board.
Monitor malfunction Blank display. 1. Press any key or move the mouse to
ensure power management has not blanked
the display.
2. Check that the monitor power ON/OFF
switch is ON.
3. Check that the monitor cable is attached
to the video connector at the back of the
system.
4. Check cable connections between the
AC power supply and monitor.
5. Adjust brightness and contrast controls
on the monitor.
6. Check cable connections between the
monitor connector and the graphics board.
7. Replace graphics board.
8. Replace monitor.