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| Green condition | There is no problem with the |
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| playback condition. This unit |
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| and the disc can be used just |
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| as they are. This |
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| corresponds to the “green” |
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| channel condition indicator of |
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| a VTR. |
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| Yellow condition | The playback condition has |
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| deteriorated to some degree. |
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| There are no read errors, but |
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| you should take the action |
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| described in the next section. |
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| This corresponds to the |
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| “yellow” channel condition |
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| indicator of a VTR. |
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| Red condition | The playback condition has |
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| deteriorated. There are no |
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| read errors,a) but you should |
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| take the action described in |
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| the next section. This |
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| corresponds to the “red” |
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| channel condition indicator of |
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| a VTR. |
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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 basic menu item
012 “CONDITION DISPLAY ON VIDEO MONITOR” to “ena,” and set basic menu item 005 “DISPLAY INFORMATION SELECT” to “T&sta.”
For details about operation, see
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.
You can use the digital clock to check the total optical output time of optical heads.
For details, see
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
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.
Preparations 3 Chapter
37 | |
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