15
Door Motor Drive
The sliding door in the model CDP-CX235 was an improved feature over
the previous manual trap door that the user pulled down to access the
disc tray table. The sliding door mechanism consists of a motor that
drives a series of gears to slide the door on plastic tracks. The door motor
stops turning when the limit switch is toggled in the closed or open posi-
tion.
Operation
Syscon IC501 controls the door movement. Only after the CD Changer is
powered ON will IC501 respond to the OPEN/CLOSE Door button at the
Key 2 input (IC501/pin 43).
Pressing the door button causes IC501 to check the position of the door.
S810, a 3-position switch, places one of three voltages at Syscon IC501/
pin 39 to indicate the door position.
Door Position Feedback
Door Position Location Voltage
Closed CN504/pin 1 2.5V
Neutral (in-between) CN504/pin 1 5V
Open CN504/pin 1 0V
A closed door will be driven open and vice versa.
Drive
Syscon IC501 applies an output voltage to pin 23 or pin 24 to drive the
motor. The resultant positive or negative voltage is applied to the door
motor.
Door Motor Drive
Movement IC501/pin 24 IC501/pin 23 IC503/pin 9
Door Opening 4.7V 0V -3.6V
Door Closing 0V 4.8V +3.7V
Feedback
As the door moves, S810 enters the neutral position and 5V is applied to
IC501/pin 39. When the door reaches the end of travel the door toggles
the S810 limit switch to the other end. IC501/pin 39 is lowered to either
2.5 or 0V. IC501 responds by stopping the motor voltage at pin 23 or 24
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