System Error Messages - NEC POWERMATE PROFESSIONAL - SERVICE MANUAL 05-1997 Service Manual

Message
Address Line Short
Cache Memory Failure, Do
Not Enable Cache
CMOS Battery Failed
CMOS Checksum Invalid
CMOS System Options Not
Set
CMOS Time and Date Not Set
Diskette Boot Failure
DMA Controller Error
Drive Not Ready Error
Floppy Disk Controller Failure
Floppy Drive A: Failure
Floppy Drive B: Failure
Gate - A20 Error
Invalid Boot Diskette
Keyboard Controller Error
Keyboard is Locked...Please
Unlock It.
Keyboard Stuck Key Detected
Master DMA Controller Error
Master Interrupt Controller
Error
Memory Size Decreased
Table 4-2 System Error Messages
Description
Error in the address decoding circuitry on the system board.
Cache memory is defective. Replace the CPU module.
CMOS RAM battery power is low. Replace the battery (see
battery replacement at the end of this section).
After CMOS RAM values are saved, a checksum value is
generated for error checking. The previous value is different
from the current value. Run Setup (see Section 2).
The values stored in CMOS RAM are either corrupt or
nonexistent. Run Setup (see Section 2).
Run Setup to set the date and time (see Section 2).
The boot disk in drive A: is corrupt and cannot be used to boot
the system. Use another boot disk and follow the screen
instructions.
Error in the DMA controller.
The BIOS cannot communicate with the diskette drive. Power
off the system and check all connections.
The BIOS cannot communicate with the diskette drive
controller. Power off the system and check all connections.
The BIOS cannot access the diskette drive A:. Power off the
system and check all connections.
The BIOS cannot access the diskette drive B:. Power off the
system and check all connections.
Gate A20 on the keyboard controller is not working. Call for
service.
The BIOS can read the disk in diskette drive A:, but cannot
boot the system. Use another boot diskette.
The keyboard controller has failed during POST.
Keyboard lock on the system is engaged. The system must be
unlocked to continue.
There is a key pressed down on the keyboard.
Error in the master DMA channel.
Master Interrupt Controller failed during POST.
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).
Maintenance and Troubleshooting 4-9