Diagnostics and Troubleshooting - User Interface
Revision 5 HC900 Hybrid Controller Installation and User Guide 135
9/03
Scanner Diagnostic LED Indication
The scanner uses its LED to communicate diagnostic information. These diagnostics are a subset of the main CPU’s
and are listed below.
Table 30 - Scanner Diagnostics
Table 30 - Scanner Diagnostics
Diagnostic
Condition
Number
of
Strobes
Possible Cause Scanner Action User Action
Ram Failure 1 RAM failed on power-up. Executes an infinite
loop that toggles the
LED.
Communications and
module scanning are
disabled.
1. Cycle power
2. Replace scanner
3. Replace rack
Rom Failure 1 ROM failed on power-up. Executes an infinite
loop that toggles the
LED.
Communications and
module scanning are
disabled.
1. Cycle power
2. Replace scanner
3. Replace rack
Invalid
configuration
2 The scanner has not been
configured by the main CPU.
Does no scanning of
modules. Modules
remain in their failsafe
state.
1. Verify that the jumpers on the
scanner are setup for the
correct rack address.
2. If a hub is used, check that all
cables are properly connected
to the hub, proper crossover
cables are used, and that hub
is powered.
3. Cycle power to the rack.
4. Cycle power to the hub.
5. Replace the expansion
rack’s(C50 CPU only) power
supply.
6. Replace the expansion rack.
7. Replace the main CPU.
8. Replace the expansion rack’s
scanner board.
