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Preventive Maintenance and Fault-finding
Instruction Manual: TT1260 Standard Definition Professional Receiver/Decoder Page 6-5
ST.TM.E10100.1
6.4 Fault-finding
6.4.1 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.
6.4.2 Factory Default Settings
TT1260 are dispatched with the factory defaults shown in Annex F. These
can be restored at any time using System Menu (#6).
6.4.3 Preliminary Investigations
1. Ensure all leads and connectors are in place and serviceable.
2. Ensure the unit is powered. If not investigate the power source.
Check the fuse.
3. Ensure the red alarm LED on the front of the unit is not lit. If it is,
investigate the Alarm status (see Chapter 4, Alarms).
4. Use the BER display to ensure that the Post Viterbi BER is less than 2.0
E-4 (refer to Section C.5.2). If it is not, check the input to the
Receiver.
6.4.4 Remote Control
The TT1260 remote control input operates with both RS-232 and RS-485
serial data formats (Menu #6.1.2).
CAUTION…
Be sure to set the correct format and address via the front panel before attempting to use this input. The
TT1260 will ignore any remote control commands if the input is not correctly set.
6.5 Changing the Equipment Fuse
CAUTION...
This product should be operated only from the type of power source indicated on the marking label. If
you are not sure of the type of power supply to your home or business, consult your appliance dealer or
local power company. For products intended to operate from battery power, or other sources, refer to the
operating instructions.
The power supply used in this equipment is a wide-ranging, ac power
supply unit designed for use in ambient air temperature conditions of 0°C
to +45°C for 100-120 Vac and 220-240 Vac, 50-60 Hz (see Annex B,
Technical Specification for details). There are no links or switches to be
altered for operation from different ac supplies.
The TT1260 is designed for User Accessible Fuse Replacement.
In addition to the fuse in the supply cable plug (if appropriate) there is a
fuse held in an integral fuse carrier at the ac power inlet at the rear of the
TT1260.