Sharp CD-K40X User Manual

The basic movement the CD changer is described as follows.
See 2 and 3.
• TheCDchangerbasicallyconsistsofthe tray (208)whichslides
on the
CD chassis (224), and the main gear (238) to move the
tray. As the main gear rotates, the projection (Zenbea
Pi.n) on
the main gear causes rotation of the CD up/down cam (241),
resulting in up/down of the CD mechanism and CD chucking.
The main gear is driven by Loading Motor MTR1.
Onthe tray (208),the turntable (209)to load a disc andthe disc
select motor MTR2 to rotate the turntable are set up. MTR2
controls the turntable movements. MTR2 which rotates on the
traycanrotatethedisctableregardlessoftheopen/closemotion
of the tray.
• Thefollowingarethe electricpartswhichcontrolthe movements
to open/close the tray and to rotate the turntable.
Tray Driving Motor (Loading Motor) : MTR1
Tray Open Switch to detect that the tray is completely
open: SW1
Photo Sensor (Tray Close SW) to detect that the tray is
closed: PHi
Photo Sensor (Mecha UP SW)to detect that the CD mecha-
nism is UP : PH2
Turntable Driving Motor (Disk Select Motor) : MTR2
Photo Sensor (Disc Select SW) to detect the disc table
position: PH3
TheTable
2 belowshowsthe portsofthe microcomputer(IC801)
to decode signals and to drive with the use of the above parts.
Under the main gear to control the
tray movements, a double
screenof concentriccircle isplaced.The relationofthe main
gear
rotatingposition and the tray position is 1:1. Heightof the screen
can be changed withthe tray closed or at the maingear position
corresponding to the tray position where the CD mechanism is
moved up/down. As a result,the
LEDlight of the photo sensors
PH1and PH2canbe shutor passedto changeoutput of PH1and
PH2 high and low.The tray movement is controlled by changing
this signal.
The signals PHi and PH2 change depending on the height of
peripheral screen, and the inner screen, respectively. When the
screen is placed low,the LED light is passed to make the photo
transistor inside the sensor turn ON, resulting in low output
(approx.0.2V). Ontheotherhand,whenthe screenisplacedhigh,
the lightis shutto makethe phototransistorOFF,resultingin high
output (5V).
Summary:
MTR1 : Controls opening/closingof the tray and up/down of the
CD mechanism.
[MTR1 rotation(clockwise/counterclockwise) ~J S' It
R
t
tl d' tl f th . irnu aneous
~ 0 a Ing irec Ion 0 e main gear ~ t f
~ Opening/closingof the tray two tvoes S 0
. wo ypes
~ Up/down of CD mechanism
MTR2 : Controls the turntable rotation.
The movementsof the maingear andthe tray, whichare
structurallycomplicated,will be explainedindependently
in the other section.Thereafter, the turntable movement
will be described.
PORT .-UN\.,; IIVN
OF MICROCOMPUTER
NAME
CIRCUIT DIAGRAM
•
Port for Macha UP SW(PH2)
ICaDi 44 pin
MECHA
UPSW
Port for Tray Close SW(PH1)
47 pin
CLOSESW
Port for Tray Open SW(SW1)
48 pin
OPENSW
Port to drive MTR1 45 pin
CLOSE MTR
46 pin
OPEN MTR
Port to drive MTR2
42 pin
MTR+
41 pin
MTR-
Port for Disc Changer SW(PH3)
43 pin
DISCTBLSW
2
OPEN
}J.-COM
IC801
SW1
Tray close
photo sensor
Loading motor
(MTR1)
Disc select motor
(MTR2)
Disc changer
photo sensor
-2-
2

Sharp CD-K40X Specifications

General

Brand	Sharp
Model	CD-K40X
Category	Stereo System
Language	English