Sony DVP-S330 Operating Instructions Manual page 54

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Self-diagnosis function
When the self-diagnosis function works to prevent the player from
malfunctioning, a five-character service number (combination of a letter and
digits) flashes on the screen. In this case, check the following table.
C13 e The disc is dirty.
=>Clean the disc with a cleaning cloth. (page 6)
C31 e The disc is not inserted correctly.
=>Open the disc tray and insert the disc correctly.
Exx (xx is any number) e To prevent the player from malfunctioning, the self-diagnosis function has worked.
=> When you contact your Sony dealer or local authorized Sony service facility, give
the 5-character service number. (example: E:61:10)
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