Alcad 912-TQ Serie Manual De Instalación Y Programación página 34

satellite programs and the type of spectrum can be programmed
automatically by selecting "Auto".
A. The 'correct QPSK/QAM transmodulation' indicator (16) does not
turn on.
C. The QPSK/QAM transmodulation stage does not receive any QPSK
signal.
S. Make sure the satellite transponder hook-up indicator is on.
A. The 'correct QPSK/QAM transmodulation' indicator (16) is flashing.
C. The QPSK/QAM transmodulation stage cannot generate the QAM
signal, because the symbol rate of the QAM signal is greater than
8.000 Kbauds (equivalent to a bandwidth greater than 9,2 MHz).
S. Select a QAM modulation mode capable of generating a QAM signal
of a lower symbol rate (increase the QAM modulation mode).
A. The QAM output channel indicator (18) does not turn on.
C. The IF-to-channel converter does not work properly.
S. Check the transmodulator supply voltages.
A. Continuous problems in several modules.
C. Wrong module supply
S. Check the voltages in the last module using a voltmeter. If the voltages
are lower than the indicated ones, check that the supply cables are in
good shape and deeply plugged in.
Serie 912 - TQ
912
OUTPUT
5 v
5 v
13 v
13 v
30 v
FA-203
Fig. 11 - Measuring voltage
ENG - 33
912
TQ-501
5 v
V
DC