Alcad 905-TO Serie Manuel D'installation Et Programmation page 39

38 - ENG
S. Check the quality of the input signal on OSD or measure the BER (Bit
Error Rate) with a field meter for COFDM digital signals at signal output
(20) of the last transmodulator of the demixing stage. BER as measured
at input must be less than 2E-2. Check that the input signal level is within
the limits specified in the technical datasheet (34).
A. The 'correct MPEG transmodulation' indicator (26) does not turn on.
C. The MPEG transmodulation stage does not receive any COFDM signal.
S. Check that IN hook-up indicator (21) of COFDM channel is on.
A. The output channel indicator OUT (27) does not turn on.
C. The converter does not work properly.
S. Check the transmodulator supply voltages.
A. On 16:9 format televisions the image is squeezed between horizontal
black bands above and below it.
C. The broadcast is in 16:9 but the programmed output format is incorrect.
S. In the output format menu, change from 4:3 mode to FULL SCREEN
16:9.
A. On 4:3 format televisions the image is stretched vertically.
C. The broadcast is in 16:9 but the programmed output format is incorrect.
S. In the output format menu, change from FULL SCREEN 16:9 mode to
LETTER BOX 4:3.
A. The picture which appears on televisions with the 4:3 screen format will
be truncated at both sides.
C. The broadcast is in 16:9, but the programmed output format is incorrect.
S. In the output format menu, change from 4:3 PAN & SCAN mode to 4:3
LETTER BOX mode.
Installation and programming manual