GRASS VALLEY M-Series, Service Manual

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M-Series Service Manual 6 July 2004
Chapter 2 Troubleshooting problems
Timecode problems
For the corrective actions in this section, refer to the M-Series User Manual for
detailed instructions
Problem Possible Causes Corrective Actions
Recorded timecode reads
xx.xx.xx.xx. No timecode source for the
channel. In Recorder, open the context
menu and choose “Options”.
Select “Timecode” in the
Options dialog to set the source.
A clip shows no mark-in/
mark-out timecode, the current
timecode display shows
XX:XX:XX:XX, or the last
valid timecode is displayed. The selected timecode source
was missing or intermittent
during recording. Check that you have the right
record channel timecode source
selected, verify that timecode is
present in the source, and record
the clip again. You can also
stripe the timecode on an
existing clip.
Incorrect recorded VITC
timecode. VITC reader is set to automatic
and there are two sets of VITC in
the VBI. Use “Look for timecode on
lines...” VITC detection and
specify lines where VITC should
be read.
Incorrect or no recorded VITC
timecode. The VITC reader is set to “Look
for timecode on lines...” and
there are two sets of VITC in the
VBI and the wrong VITC lines
may be specified. Verify location of VITC signals
and set up “Look for timecode on
lines...” VITC detection
accordingly.
Can’t read or record VITC. VITC detection is set to “Look
for timecode on lines...” and the
wrong VITC lines are specified Set VITC detect to Automatic or
verify location of VITC signals
and set up “Look for timecode on
lines...” VITC detection
accordingly.
Incorrect VITC timecode on
the video output. There may be two sets of VITC
on the video output and an
external reader is reading the
wrong timecode signal. Two
VITC signals can occur when
there is VITC on the video input
or playback signal and at the
same time, the video output is
generating VITC. Turn off the VITC generator on
the output.