Troubleshooting - Videotec SM84A Manuel D'instructions

6 Troublesh ooting
PROBLEM
Power LED is off
Remote keyboard
commands are not
carried out
Output video 4 does
not switch
The keyboard is
unable to switch some
of the matrix outputs
The Aux line does not
work
Telemetry via coaxial
cable does not work
The matrix shows
completely black
screens, without
identification text
The automatic
switching sequence
does not correspond
to the preset
sequence.
PROBABLE CAUSE
Power supply absent
Wiring not connected
Protocol configuration
error
Configuration error in
baud rate for
communication with
keyboards
Wiring error
VCR trigger setting
The keyboard has been
enabled to manage
some of the monitors
Aux Line disabled
Keyboard and matrix
protocol configuration
error
Wiring error
Telemetry via coaxial
disabled
Keyboard and matrix
protocol configuration
error
Error in receiver address
setting
Wiring error
Error in switching cycle
setting
Manual switching on
input video not present
Error in switching
sequence setting
REMEDY
Make sure the jack from the power supply is properly
inserted in its socket.
Make sure the power supply is properly inserted in
the main outlet socket.
Make sure that, after the matrix opening, the LED
wiring connector was not disconnected.
Make sure the matrix has the same communication
protocol as the keyboard (see configuration dip
switches in section 3.4.2.2).
Make sure the communication rate is the same as
the setting for the keyboards (see configuration dip
switches).
Make sure the cables are intact and follow the wiring
diagrams (see the chapter on installation). Do not
exceed the maximum allowed distances: 1200 m for
non-remote powered keyboards (RS485 lines A and
B) and 700 m for remote powered keyboards
(12VDC Lines and GND).
Output 4 has been set for control by VCR trigger. If it
is to be controlled by the keyboard go to the
'External triggers' item and set Use VCR: No.
Some keyboard models (DCJ, DCK e DCT), allow
the control of some output videos to be disabled.
See the specific keyboard manual and check the
settings for the output videos that can be controlled
by the keyboard.
In the menu for the Aux line, make sure protocol and
baud rate settings for the line are the same as those
for the receiver/mux to be controlled
The matrix and hence all the keyboards should have
the MACRO protocol setting and the same baud rate
Check the wiring for the Aux line with that shown in
the installation chapter.
Check the menu for enabling Coax Telemetry
Transmission via coaxial cable.
The matrix and keyboards should have the MACRO
protocol setting with the same baud rate
The receiver address should be the same as that of
the input video to which it is connected by coaxial
cable (e.g. input video 4 / receiver with address 4 )
Make sure the coaxial cable is intact. Do not insert
video distributor, amplifiers or equalisers between
the telemetry receiver and matrix input. Do not
exceed the maximum allowed distance for telemetry
transmission via coaxial cable (350 m)
Use the menu to make sure the switching sequences
have been set up with the input videos present.
If manual switching is carried out on an input video
that is not present, a completely black screen without
identification text will be shown.
Check the switching sequence setting in the
switching sequence menu.
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