Randomaccess - Sony LDP-1000 Manual

2-3-6. Random Access
LDP-1000 is equipped with an access motor to move the sled at
a high speed during the random access mode in addition to the pre-
cision motor that moves the sled with advancement of track in the
normal playback mode. The access motor is driven by four level de
voltages (FWDx360, FWDxl00, REVx360, and REVxl00) generat-
ed in the access voltage generator.
The slide motor drives the sled via a transmission mechanism
that has a large gear ratio to get high precision sled feeding. It is
designed that the rotation noise of the motor should not interfere
with the PB signal. An electromagnetic clutch is provided to protect
the drive circuit from the flash-back of the counter electrornotive
force of the motor into drive circuit in the access mode that can be
resulted from the large gear ratio.
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