Alcad 912-US Serie Manual Del Usuario página 33

32 - ENG
A. Image contrast is not correct.
C. The video level selected is not the right one.
S. Change the video level (V LEVEL function).
A. There is no sound, only noise.
C. The frequency of the audio sub-carrier is not properly programmed.
S. Properly program the frequency of the audio sub-carrier(A. FREQ
function)
A. Sound is distorted and with background noise.
C. The frequency of the audio sub-carrier is not properly programmed.
S. Properly program the frequency of the audio sub-carrier (A. FREQ
function).
A. Sound is distorted and with background noise.
C. The audio bandwidth selected is not the right one.
S. Change the audio bandwidth (A. BW function).
A. The sound is too high or too low-pitched.
C. The selected audio deemphasis is not the right one.
S. Change the audio deemphasis (A. DEEMPH function).
A. The level of sound is different to the rest of the channels.
C. The audio level selected is not the right one.
S. Change the audio level (A. LEVEL function).
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.
Installation and programming manual
912
OUTPUT
5 v
5 v
13 v
13 v
30 v
FA-203
Fig. 10 - Measuring voltage
912
US-511
5 v
V
DC