Motor Driver; Tray Position Detection - Sony DVP-M35 Operation Manual
Cd/dvd player
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Also See for DVP-M35:
- Service manual (105 pages) ,
- Operation manual (79 pages) ,
- Operating instructions manual (50 pages)
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Disc loading,
unloading,
and chucking
operations
are performed
with one DC motor. Its
block diagram
is dhown in Figure 3-19.
3-4-1.
Motor
Driver
The system controller
IC (IC805)
controls the open and close of the tray. It monitors
the
sensors of the mechanism
and
conti:ols the operations
of the tray motor via the L G/A IC (IC804).
The tray open/close
signal is output by 3-state PWM modulation
from IC804.
H (5V)
= Open
High Z = Stop
L (Gnd)=
Close
The tray speed is controlled
by increasing/decreasing
the PWM duty ratio.
The TRAY FREE signal is used to control the Mute terminal of the driver directly, turn OFF
the motor drive, and free the operations.
During
the stop state, the potential
difference
between
the two terminals
of the motor is
controlled
to 0V, while during the Tray Free state, the motor is not controlled
at all.
3-4-2.
Tray
Position
Detection
Tray position
detection
is carded
out by the chucking
sensor PH001 and tray out sensor
S001 on the TK-47 board. These signals are input to the MB-78 board via the flexible
flat
cable, and input to L G/A (IC804) CHUCK
_)P, and TRAY _P.
The relation
between tray position and sensor signals is as shown below:
Mode
<TRAY OUT (CN005(_))>
<CHUCKING
(CN005(_))>
Tray out position
H
L
Tray opefating
L
L
Chucking
position
L
H
!
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