Sony CDP-XE400 Service Manual page 11

Pin No. Pin Name
97 MDS
98 LOCK
99 SSTP
100 SFDR
I/O
O Output to control spindle motor servo. (Not used.)
O GFS is sampled by 460Hz. H when GFS is H. (Not used.)
I Input signal to detect disc innermost track.
O Sled drive output
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Function