NEC MT-2550-24874C, Service Manual

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4-10 Maintenance and Troubleshooting
Table 4-2 System Error Messages
Message Description
Off Board Parity Error Parity error in the installed expansion memory. The format is:
OFF BOARD PARITY ERROR ADDR (HEX) = (XXXX)
XXXX is the hex address where the error occurred.
Slave DMA Controller Error Error in the slave channel.
Slave Interrupt Controller
Error Slave Interrupt Controller failed during POST.
System Memory Size
Mismatch The amount of memory on the system board is less than the
amount in CMOS RAM. Check for mismatched SIMM sizes.
(All SIMMs must be the same size within a bank.) Run Setup
(see Section 2).
Timer Channel 2 Error Most systems include two timers. There is an error in timer 2.
Table 4-3 PCI Error Messages
Message Description
Bad PnP Serial ID Checksum The Serial ID checksum of a Plug and Play card was invalid.
Floppy Disk Controller
Resource Conflict The diskette drive controller has requested a resource that is
already in use.
NVRAM Checksum Error,
NVRAM Cleared The ESCD data was reinitialized because of an NVRAM
checksum error. Try rerunning the ICU.
NVRAM Cleared By Jumper The “Clear CMOS” jumper has been moved to the “Clear”
position and CMOS RAM has been cleared.
NVRAM Data Invalid, NVRAM
Cleared Invalid entry in the ESCD.
Parallel Port Resource
Conflict The parallel port has requested a resource that is already in
use.
PCI Error Log is Full This message is displayed when more than 15 PCI conflict
errors are detected. No additional PCI errors can be logged.
PCI I/O Port Conflict Two devices requested the same resource, resulting in a
conflict.
PCI IRQ Conflict Two devices requested the same resource, resulting in a
conflict.
PCI Memory Conflict Two devices requested the same resource, resulting in a
conflict.
Primary Boot Device Not
Found The designated primary boot device (hard disk drive, diskette
drive, or CD-ROM drive) could not be found.