Sony PDW-HD1200 Operation Manual page 42

Display Name
Red condition The playback condition has
C Disc
exchange
cache
a) Read errors will occur if the playback condition continues to deteriorate.
If a read error occurs, a "Disc Error!" alarm appears in the time data
display, the picture freezes, and audio is muted.
To display playback condition marks, set setup menu item
012 CONDITION DISPLAY ON VIDEO MONITOR to
"ena", and set setup menu item 005 DISPLAY
INFORMATION SELECT to "T&sta".
For details about operation, see "Basic menu operations"
(page 118).
Playback condition displays
You can be alerted in advance to deteriorating playback
conditions and to error correction rates which are
approaching their limits.
Deteriorating playback may be due to the following
causes.
• Scratches and dust on the disc surface
This includes fingerprints, dust from the air, tar from
cigarette smoke, and so on.
Scratches and soiling which occur before recording are
not a problem because they are registered in advance as
defects, and recording avoids them. However, scratches
and soiling which occur after recording can lead to
deteriorating playback conditions.
• Aging of disc recording layers
Over several decades, the recording layers of optical
discs can age and cause deteriorating playback
conditions.
You can use this function to check archival discs and
other discs which have been stored for extended periods,
so that you can take action before the deterioration
progresses further.
• Deteriorating laser diodes performance
The performance of the laser diodes used in optical
heads can worsen with age, leading to deteriorating
playback conditions.
For details, see "Digital hours meter" (page 146) about
this setting.
Refer to the Maintenance Manual for an approximate
guide to when it is time to replace optical heads.
42
Superimposed Text Information
Description
deteriorated. There are no read
a)
errors, but you should take the
action described in the next
section. This corresponds to the
"red" channel condition indicator
of a VTR.
This appears during cache
recording.
For details, see page 51.
To prevent playback conditions from
deteriorating
Pay attention to the following points when handling discs.
• Do not open disc cartridges and touch discs directly with
your hands.
• Do not store for long periods in locations which are
dusty or exposed to air circulated by fans.
• Do not store for long periods under high temperatures or
in locations exposed to direct sunlight.
If playback conditions have deteriorated
If a yellow or red playback condition mark appears, check
the following points.
Whether the disc displays the same playback
condition on other XDCAM devices
If so, the surface of the disc may be dirty or scratched, or
the performance of the recording layers on the disc may
have worsened due to age. Do not use discs with these
symptoms.
Whether every disc inserted into an XDCAM
device displays the same playback conditions
If so, the performance of the laser diodes may have
deteriorated. Check the total optical output time.