NEC Express 120Mf User Manual

4-8  Troubleshooting 

 

 

Beep        Error 

Cause 

Troubleshooting 

1-2-2-3    ROM checksum error 

FMEM checksum error 

Replace MotherBoard 

1-3-1-1    DRAM refresh test error 

Memory refresh error 

Replace DIMM 

1-3-1-3    Keyboard controller error 

Keyboard controller 
error 

Replace MotherBoard 

1-3-3-1  DIMM can not be detected 

Memory not installed or 
cannot write. 

Check DIMM 
Mounting or Replace 
DIMM 

1-3-3-1  Memory check error 

↑ 

↑ 

1-3-4-3    DRAM test low byte error 

Memory address signal 
fault (low side) 

Replace MotherBoard 
or DIMM 

2-2-3-1    Unjust exception test error 

Unjust exception 

Replace MotherBoard 
or CPU 

1-2         Video configuration fails 

Expansion VGA BIOS 
memory 

Deployment failure

 

Replace MotherBoard 
or Graphic board 

1-2        OPTION ROM Checksum failure  Expansion ROM BIOS 

memory 

Deployment failure

 

Replace MotherBoard 
or Option board