10
CX-958
b) Brake Circuit
The servo retracting performance can be deteriorate
during the setup or track jump operation. In this
connection, the brake circuit is used to ensure steady
retract of the tracking servo. The brake circuit detects in
which direction the lens is moving, then slows down its
move by outputting the drive signal that moves the
lens into the opposite direction alone. Track slippage
direction is determined by referencing the TEC and
MIRR signals and their phase.
TEC
TZC
(TEC "SQUARED UP" )
(INTERNAL SIGNAL )
MIRR
MIRR LATCHED AT
TZC EDGES
=
SWITCHING PULSE
EQUALIZER OUTPUT
(SWITCHED)
DRIVE DIRECTION
Note : Equalizer output assumed to hava same phase as TEC.
FORWARD
LENS MOVING FORWARDS
(INNER TRACK TO OUTER)
LENS MOVING BACKWARDS
Time
REVERSE
Fig.15 : TRACKING BRAKE CIRCUIT
Summary of Contents for DEH-1350B
Page 6: ...4 DEH 2350 1350 2 2 EXTERIOR B A ...
Page 8: ...6 DEH 2350 1350 2 3 CD MECHANISM MODULE C D ...
Page 25: ...23 DEH 2350 1350 ...
Page 28: ...26 DEH 2350 1350 1 2 3 4 1 2 3 4 D C B A A 4 5 6 3 2 1 1 2 3 6 5 4 A TUNER AMP UNIT ...
Page 29: ...27 DEH 2350 1350 5 6 7 8 5 6 7 8 D C B A A 1 2 3 6 5 4 4 5 6 3 2 1 FRONT SIDE B ...
Page 31: ...29 DEH 2350 1350 1 2 3 4 1 2 3 4 D C B A B B CN601 A SIDE B KEYBOARD UNIT ...
Page 33: ...31 DEH 2350 1350 1 2 3 4 1 2 3 4 D C B A CLAMP SIDE B CONTROL UNIT C C ...
Page 40: ...38 DEH 2350 1350 Grating waveform Ech Xch 20mV div AC Fch Ych 20mV div AC 45 0 75 60 30 90 ...
