Preventive Maintenance and Fault-finding
Page 6-6
Instruction Manual: Professional Receivers and Decoders (IRD)
ST.TM.TT1220.1
6.5
Fault-finding
6.5.1
General
The information contained in this chapter is intended to isolate the unit as
the faulty equipment if a system failure occurs. If the following information
fails to clear the abnormal condition, please contact Customer Services
using the information given in the Preliminary pages of this manual.
6.5.2
Preliminary Investigation
1.
Ensure that all leads and connectors are in place and serviceable.
2.
Ensure the unit is powered.
3.
Ensure that the front panel LED is not lit. If it is lit, investigate the
cause of the alarm in the alarm status menu as explained in Chapter
5, Alarms. If the LED is not lit, verify that alarm conditions that could
be met have not been masked as explained in Chapter 5.
4.
Verify signal lock, and that the BER is within the acceptable range
(QPSK input only).
6.5.3
Testing
The TT1220 runs a self-initialisation and test at start-up. Verify that the
display reads “initialising” when the unit is powering up, and that the
hardware is working properly, by looking for alarms in the alarm status
view.
If any configuration alarm messages exist, write them down before
contacting the TANDBERG Television Customer Services
