Explanation; Mechanism Descriptions - Pioneer AVX-P7300DVD Service Manual

7.3 EXPLANATION

7.3.1 MECHANISM DESCRIPTION
- THE DRIVE MECHANISM SECTION
- Outlines of the hardwares
Driving Motor
The angular adjustment and monitor ejection
control (position and angle) motor
Sensors
Photo interrupter for angular detection *2
Zero angle detection switch (L when the angle is
0 degrees)
- Operation Summary
1. The back and forth movements, as well as the angular adjustment controls of the monitor are all driven by the
operation of one motor.
2. In order to detect the startup angle of the motor, the photo interrupter will detect and count the pulse.
3. For a reset start, the retraction operation is performed first followed by the ejection operation resulting in a mounted
condition (the angle of the monitor in a mounted condition is 100 degrees).
4. Angular adjustments are performed by using the ANGLE +/- keys (the ANGLE +/- keys are effective for adjusting
angles, between 55 and 110 degrees in 28 increments).
* With its origin at the point where the DEG0SW switches from H to L,, it is 30 edges to the 55 degree position, and
57 edges to the 110 degree position.
5. The monitor retraction operation is triggered by pressing the OPEN/CLOSE key (or when the ACC OFF state is
attained when the automatic ejection and retraction setting is set to ON) (or if the ACC OFF key is pressed when
the system is in the automatic ejection and retraction setting).
6. The back and forth movements are set to a high-speed mode and angular control is set to a low-speed mode, at all
times (switch is set by the hardware).
7. Braking is continuous even after the motor has stopped.
8. The brake is applied once when the motor switches from one operating mode to another.
- Electrical criteria
Sensor signals
Encoder pulse
DEGPUL1 : Pulse sensor 1 for angular detection
DEGPUL2 : Pulse sensor 2 for angular detection
Sensor signals
DEG0SW : monitor angle detection is 0 degrees
Control signals
MTRPW : Motor electrical power supply control
(H when turned ON)
MTR1 : Motor control signal 1
MTR2 : Motor control signal 2
Forward Reverse
rotation rotation
MTR1 H
MTR2 L
Motor terminal voltages (set by hardware settings)
* The voltage required to sustain a constant rotation
rate.
High-speed mode : VMH = 6.5 – 10.0V
Low-speed mode : VML = 2.5 – 5.5V
AVX-P7300DVD
Brake Standby
L H L
H H L
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