3-3 Checking Recording
and Playback
Disc playback start position
Although this unit uses optical discs, it is designed to offer the most convenient features of tape playback by VTRs. One of these is the playback start position, which works in the same way as tape, as described below.
After playback stop
The unit stops at the position where the STOP button was pressed.
Press the PLAY/PAUSE button to resume playback at the stop position.
After recording
The unit stops at the position where recording ended.
To play back a clip, press the PREV button to move to the start frame of any clip, or press the PREV button with the PLAY/PAUSE button held down to move to any position.
After disc insertion
The unit stops at the position of the disc when it was most recently ejected.
Press the PLAY/PAUSE button to resume playback at the most recent position.
The playback position is saved to the disc when the disc is ejected, which allows playback to start at that position whenever it is loaded into any XDCAM player.
Note
The playback position is not recorded to the disc if the disc is set to REC INH.
3-3-1 Normal Playback
By pressing the PLAY/PAUSE button, you can review any length of recording on the viewfinder screen in black and white or in color on the color LCD. There are two other ways to review the recording.
•Recording review: You can view the last two seconds of the recording on the viewfinder screen in black and white or in color on the color LCD.
•Color playback: You can see the recording in color on a color video monitor without the need for any external adaptor.
You may also view the picture during a fast forward or reverse search.
See
Deteriorating playback conditions
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.
You can use the digital clock to check the total optical output time of optical heads.
Refer to the Maintenance Manual for an approximate guide to when it is time to replace optical heads.
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
Read errors occur when playback conditions continue to deteriorate.
When a read error occurs, the message “DISC DEFECT” appears, the video freezes, and audio is muted.
If this happens, 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.
Playback and Recording 3 Chapter
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