DHC-MD555 (serv.man2) - Sony Audio Service Manual (repair manual). Page 11

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(2) Data signal (DATA:6 pin)
Bi-directional communication is performed between the MD Walkman and system controller of the system stereo.
Fig. 2-3. Data Signal
Liquid crystal display data is periodically output from the system controller of the MD Walkman. To copy the track name data, the data
transmission request command is output to the DATA terminal from the system controller of the system stereo, and the track name data is
transmitted from the system controller of the MD Walkman.
500uS
3V
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