6–6
Solving Problems
A double question mark indicates a hard error. This indicates a serious
problem that may affect normal operation and use of some component of
the system. For example:
•
?? 1 00C0 0000.7004
This message indicates that the Ethernet subsystem is present in the
system, but one or more of the following problems exist:
– No cable is installed on the ThinWire/standard Ethernet
connectors.
– The loopback connector is not installed on the standard Ethernet
port.
– The terminator is not installed on the ThinWire Ethernet port.
– The network select switch is set to the wrong position.
– A cable is faulty.
Table 6–2
Power-Up and Self-Test Display Identifiers
Test Identifier
Device
F
Reserved for later use.
E
System clock.
D
Nonvolatile RAM.
C
Serial line controller.
B
Memory.
A
Memory management unit.
9
Floating point unit.
8
Interval timer.
7
SCSI-A bus controller.
6
SCSI-B bus controller.
5
Interrupt controller and Ethernet ID ROM.
4
Reserved.
3
Reserved.
2
Reserved for later use.
1
Ethernet network interconnect (NI).
