IBM 6400 series Maintenance Manual page 213

Ethernet Interface LEDs and DIP Switches
The Ethernet Interface has three LEDs and three DIP switches, as shown
below. These indicators and switches are adjacent to the data line
connectors. LED patterns are defined in the table below the illustration.
STAT
(System
Status)
ON
ON
ON
OFF
OFF
FLASH
FLASH
FLASH
ON
The Ethernet Interface Assembly has a self test and two internally controlled
modes:
Power-on Self Test: A seven stage power-on self test performs diagnostics
on the Ethernet Interface processor, RAM, ROM, EEPROM, parallel port, and
network interface. The STAT, ERR, and NET LEDs indicate which test is
currently in progress.
Run and Auto Reset Modes: Run Mode is the normal operating state of the
Ethernet Interface. Auto Reset mode is entered when the watchdog timer is
triggered and the Print Server resets itself. In either mode, the STAT LED
flashes differently depending on whether the unit IP address is configured.
Replacement Procedures and Illustrated Parts List
Status Indicator LEDs and DIP Switches
STAT ERR NET
Status
Grn Red Grn
Indicators
DIP
Switches
1 2
LED Pattern Indications
ERR NET
(System (Data to
Error) Network)
OFF ON
OFF OFF
ON OFF
ON ON
OFF ON
OFF FLASH
ON FLASH
FLASH OFF
FLASH ON
OFF
(Default is all
switches OFF,
as shown.)
3
Mode
RAM Test
ROM Test
EEPROM Test
Network Interface Test
PRN1 Test
Run Mode
Auto Reset Mode
Firmware Panic
Hardware Exception
213