Control Unit IV Reference Manual
529-0004 Ver.3 6-1
6. TROUBLESHOOTING
This chapter provides troubleshooting instructions for identifying and solving problems that
may occur while you are connecting, setting up or using the Control Unit.
To help you diagnose what the problem is, use the Control Unit’s LEDs on the front panel
and the error messages displayed on a terminal. Once you have identified the problem, refer
to one of the nine sections in this chapter for solutions.
Using the Control Unit’s LEDs to troubleshoot
The following table lists each of the LEDs on the Control Unit’s front panel and summarizes
the normal and abnormal status of LEDs when the unit is powered on and in use. Under
certain conditions, the LEDs may flash. Use the table below to locate detailed information
and troubleshooting help in this chapter.
Table 6-1: Verification of status LEDs
LED Normal status
when in use
Error condition
when in use
Troubleshooting
section
POWER
On Off 6.1
MASTER
On
*
Off
*
6.4.3, 6.4.4
STATUS
On Off 6.7, 6.8
BATTERY
Off On (red) 6.1
FSK
On Off
*
6.2
MODEM
Not used Not used See 6.3.2 for
external modems
RX
/
TX
1, 2, 3
Off, flickering or
lit steadily
Off
*
6.3.1, 6.4.1
*
There are exceptions to these rules. See the referenced troubleshooting section for more details.
Using the Control Unit’s error messages to troubleshoot
The Control Unit performs a diagnostic test when it is powered on and when it is reset. You
can view the diagnostic screen by connecting a terminal to the Control Unit and using
communication software such as HyperTerminal.
1. Connect a terminal to COM 3 and open a session.
2. Reset the unit by pressing the
RESET
button, except if you have a redundancy system. In
this case, you need to turn off the units and then turn them back on (see section 6.4.3 on
page 6-10 for instructions). The information displayed at startup indicates the status of
each of the sub-systems.
3. Make sure that a discharged battery is not causing the problem (see Chapter 5 for battery
replacement). If the battery is working properly, note the errors identifying the defective
sub-system as the Control Unit boots, and contact Electroline’s technical support
department. See section 6.9 for a list of error messages.
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