Network Control Module 300 Series Technical Bulletin 70
Table 24: Diagnostic LEDs, Descriptions, and Remedies
Error LED Description Action
LED 1 (flashing)
EPROM checksum error Power down, reseat ROM SIMM
(NU-ROM101 or NU-ROM150), and
power back up.
LED 2 (flashing)
DRAM read/write error
If an LED 2 DRAM read/write error
occurs, it is followed immediately by a
second LED indicator corresponding to
the source of the DRAM error. If there is
no second LED, there is an on board
DRAM error.
Power down. Check the memory switch
settings, and reseat the affected DRAM
SIMM. Then cycle power.
LED 2 Alone
On board DRAM error
LED 2 with LED 3
SIMM Slot J4
LED 2 with LED 4
SIMM Slot J3
LED 2 with LED 5
SIMM Slot J2
LED 2 with LED 6
SIMM Slot J1
LED 2 with LED 7
Parity error
LED 3
NOVRAM error Power down, reseat NU-ROM101 or
NU-ROM150 ROM SIMM, and power
back up.
LED 4
Serial communication error Cycle power. Review the startup results
using NCSETUP. If any of the internal
loopback tests failed, replace the NCM.
LED 5
ARCNET error
(or ARCNET card not installed)
Check the address for the I/O base and
memory base. Check the interrupt
settings. Reseat the ARCNET board and
cycle power on the NCM. (Ignore if
ARCNET card is not being used.)
If the NCM is a Fire-Net NCM
(NU-NCM300-FIRE), both the ARCNET
base I/O address and the ISA Slot 1 base
I/O address must be set to 2E0 (factory
setting).
LED 6
Sanity error The NCM may continue to operate but at
a degraded level of reliability.
(Time-of-day also may be affected if the
sanity test fails.)
LED 7
Clock/calendar error The NCM may not keep accurate time
during a power down; replace the NCM.
LED 7 Flashing and
Processor Halted
DRAM Parity
LED 8
Battery error Make sure the battery is properly installed.
Replace the battery if necessary (see the
battery testing procedures).
LED 1 and LED 2
(NCM350 and
NCM361 only)
MINIBIOS, ROMDOS, or ROMDISK
Checksum error
Replace NU-ROM101 or NU-ROM150
SIMM or update flash.
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