Sharp CD-C4400 Series, CD-C4450 Series, CD-K40X Technical Manual

Inthe interests of user-safety the set should be restored to its original condition and only parts identical to those specified be used.
Page
1. BASIC CONSTRUCTION 2, 3
2. RELATION OF THE MECHANICAL OPERATION OF THE MAIN GEAR AND THE TRAY AND THE ELECTRIC CONTROL 4
3. TIMING CHART FOR TRAY MOVEMENT
4. TIMING CHARTOF ELECTRIC SIGNALS FOR TRAY MOVEMENT 7
5. THE TURNTABLE MOVEMENT IS EXPLAINED AS FOLLOWS 8-10
6. SUPPLEMENT 11
Service Headquarters: Sharp Plaza,
Mahwah, New Jersey 07430-2135
The basic movement the CD changer is described asfollows. See 2 and 3.
• The CDchangerbasicallyconsistsofthetray(208)whichslides on the
CD chassis (224), and the maingear (238) to movethe
tray. Asthe main gear rotates, theprojection (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 maingear is driven by Loading Motor MTR1. Onthetray (208),theturntable (209)toload a discandthe disc select motor MTR2 to rotate the turntable are set up. MTR2 controls the turntable movements. MTR2 which rotateson the traycanrotatethedisctableregardlessoftheopen/closemotion of the tray.
•Thefollowingarethe electricpartswhichcontrolthemovements to open/closethe tray and to rotatethe 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 PhotoSensor (Mecha UP SW)to detect that the CD mecha­nism is UP :PH2 Turntable Driving Motor (Disk Select Motor) : MTR2 Photo Sensor (Disc Select SW) to detect the disc table position: PH3
TheTable
2 below showsthe ports of the 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
screenofconcentriccircle is placed.The relationofthemain
gear rotatingpositionandthe trayposition is 1:1. Height of the screen can bechanged withthe tray closed or at the maingear position corresponding to the tray position where the CD mechanism is movedup/down. Asa result,the
LEDlight ofthe photo sensors
PH1and PH2 can be shut or passedto changeoutput of PH1and
PH2 high and low.The tray movementis controlled by changing
this signal. The signals PHi and PH2 change depending on the height of peripheralscreen, andthe inner screen, respectively.When the screen is placed low, the LED light is passed to makethe photo transistor inside the sensor turn ON, resulting in low output
(approx.0.2V). Ontheotherhand,whenthe screenisplacedhigh,
the lightisshutto makethe phototransistorOFF, resultinginhigh 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 Ion0 e main gear
~
t f
~
Opening/closingof the tray
two
tvoes S 0
. wo ypes
~
Up/downof CD mechanism
MTR2 :Controls the turntable rotation.
The movementsofthe maingear andthe tray, whichare structurallycomplicated,willbeexplainedindependently inthe othersection.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)
Discselect motor (MTR2)
Disc changer photosensor
-2-
2
253
f-S09
-3-
3
613 x2
In case the main gear rotates once clockwise while the CD mechanism is not chucking a disc and the tray is open, aseries of movements are performed as follows: The open tray is closed. Complete closing is followed by UP movement of the CD mechanism (disc chucking movement). When the main gear continues rotation, a series of movementsto open the tray isconducted again. These movements are equivalent to the following actual use
condition; when the tray isopen, adisc is loaded onthe turntable. Then the tray is closed to play CD. In this play mode the tray is opened.
'The reverse movements are performed by rotating the main
gear
counterclockwise;
when
the main
gear
is rotated
once counterclockwisewhile the CD mechanism is chucking a disc and the tray is open, the tray is closed. The DOWN movement of the CD mechanism and then the tray open movement follows. The
movement to open/close the tray, which does not simply corre­spond to the rotating direction of the main gear, will change according to the CD movement mode. The Table 3 below shows the above-mentioned movement. The CD stop condition is main in the actual use of the CD changer.
Figure 5-1to 5-6 and 6-1 to 6-6 shows a series of process to close the opening tray with the CD mechanism down, and Fig. 7, the Timing Chart of Electric Signals. The main gear to slide the tray is of rack' pinions. Double pinion gearsof the main gear are set vertically. Their diameters are slightly different. One gear with larger diameter engages withthe rack gear onthe left side ofthetray;the otherone with smaller diameter engages with the rack gear on the rightside of the tray.
STATE
NU
I A I
INU
DIRECTION OF
GEAR
CD stop condition (CD Mechanism UP)
CLOCKWISE
COUNTERCLOCKWISE
Movementdirection
The tray is opened with CD Mechanism UP.
To close the tray under the condition as (In case the tray is opened in the CD mentioned left, the main gear is rotated PLAY mode)
counterclockwise.
COUNTERCLOCKWISE
CLOCKWISE
The tray is closed with CD Mechanism Down.
To close the tray under the condition as (In case the tray is opened by stopping CD.)
mentioned left, the main gear is rotated
clockwise.
-4-
TRAY~
A
CD
UP/DOWN
CAM
~
-..
-e----+--
TRAY
LOCK
PIN
MTR
POWER
OFF
160
OPEN
STOP
®
®
5=2
®
®
t
MA
IN GEAR TO FREE
MTR
STOP
FOR
DELAYED
OF
TURNING
D/T
PH1;ON
5·5
ZENE8A
PIN TO
TOUCH
5=6
Fig.
5-1
:Thetray is completelyopen. At
[AJ,
the lowergear with largerdiameter engages with the rackgear on the left side ofthe tray. Tray Open ) ON : Low level Presseitherthe Open/Closekey orthe tray toturn
SW1
OFF(HIGH). Then
MTR1
startsrotatingclockwise. Bythe clockwise
rotationof the main gear, thetray is movedto close.
Fig.
5-2:Whenthe maingear rotatesto this position,the tray lockpin beginsto enterthe guide ofthe maingear. Ifthe pinfurtherenters
the inner part, the tray is locked in the close state.
Fig.5-3 : The maingear has rotatedfurther in comparisonwith the condition shownin Fig. 5-2. Fig.5-4 : Whenthe maingear rotatesto this position,the rackgear of the tray and the piniongear of the maingear are disconnected.
Thereafterthe tray is moved the tray lock pin.
Fig.5-5 :The tray iscompletelyclosedat this position.When the Close ) is ON,
MTR1
willstop untilthe turntablemovesto the
regularposition.
Ifthe CD mechanismmoves upwhilethe turntableis not at its regularposition,the turntablewill collide with
the mechanism.When the turntable movesto the regularposition,
MTR1
starts rotatingagainto advanceto the next step.
Fig.5-6 :The Zeneba pin setin the maingear beginsto contactthe Up/Downcamto movethe CDmechanismup/down.Atthis position,
theCD
mechanism
starts
moving
up.
-5-
®
CENTER
POSITION__..(9)
8 <OPEN.DISC
SKIP
PLAY
~
P.
~
I I
I I
1 1
1 i
-----L-
1--
t I
PLAY.
STOP
6
...
1
ZENEBA
PIN
FREE
CD
MECHAN
I8M UP
6
...
2
MECHA
UP -
MTR
STOP
PH2:0N
6
...
3
GEAR
TOUCHTORACK
GEAR
PH1
:OFF
TRAY
LOCK
PIN TO
FREE
6
...
5
I
t
j
PLAY
TIME
OPEN
160mm
MTR
POWER
OFF
6-6
I
~
6-1 : The CD mechanism is in the UP movement after half rotation of the Up/Down cam.
Fig. 6-2 : The up movement of the CD mechanism has completed when the Up/Down cam finishes rotation. (Disc chucking completed)
Fig. 6-3 : The photo sensor (PH2) becomes low level; MTR1 stops. At this position CD stops. Disc chucking has been completedto wait
for CD Play.
6-4 : At the pinion gear with smallerdiameter set in the main gearstarts engaging with the rack gearon the right side of the tray.
Then the tray starts opening. The Close ) is level)
6-5 : At this position, the tray lock pin becomes free. The main gear and the tray rack gear engage to open the tray.
6-6
: The tray Open SW(SW1) is turned ON to stop MTR1 and to open the tray fully.
To
simplifythe description, we explained the case in which the main gearrotates clockwise"afterthe tray is open. Inthe actual movements,
however, the
CD STOP condition is main as shown in Fig. 6-3.
-6-
I B I I
12
Tray
Opening
completed
Tray
Opening
started
D
B
B
I
.Ilrm-"li""""'"'-----------""""""---
I I I
I B
D I
II II
I D
I B
D D
I I I I
10
I I
5 6 8 9
,t
,;
R
iI
R
I
DR
I.
I. I I I
I D
"""""""'--------------""'"'11 I
I I I
2
CLOSE
47
44
Pin
48
Mechanism
Down---~
1
-7-
[Outline] : The 3-disc rotary changer mechanism is to
rotate the turntable inside the tray whose OPEN/ CLOSE movement is controlled by the microcom­puter. This microcomputer detects the turntable address and stop positions, and performsstart/stop ofthe turntable.
NO. INPUTI FUNCTION
I
__
m
:_m-IIUN
OF-___
....
.-
UUBII"'UI
43
Input
DISCTBLSW
To input the photo-interrupter in the slit under the turntable. To detect the position of the turntable by
. counting.
To detect the slowing-down time and the stop position of the rotary motor.
42 Output DISC CHG MTR + To output to control clockwise rotation, slowing-down, and stop of the turntable select motor.
41 Output
DISC CHG MTR -
To output to control counterclockwise rotation, slowing-down, and stop of the turntable rotary motor.
cnaneer mechanism
~nlr1tr.F\1
detectthe
disc
The position is detected in case that the memory disappeared because
of service interruption, etc, in the initial state, and in
case of starting movement after ERROR. To detectthe turntableposition bythe input of
PIN
NO.43
(DISC
TBl
SW).
The disc table is rotated clockwise
NO.42:
DISC CHG
MTR
+=[H]) to detectthe pulse which changes from [H] to [L]
approx. 35 msec after the DISC
TBl
SW changes from
[l]
to
[H].
(In case that the DISC
TBl
SW changes from [L] to [H], and within 20 to 50 msec it changes from [H] to [L], the detected pulse is recognized as the turntable address detection pulse). The position ofthe STOP control signal which appears approx. 200 msec after the pulse will be the DISC address [1
l-
In the turntable position detection mode, the turntable is stopped at the DISC address [1].
-8-
Theturntablepositionis changed bythe movementto rotate
the turntable clockwise by 120 degrees (PIN No.42: DISC
CHGMTR+ =[H]),or counterclockwiseby 120degrees No.41:DISC CHG MTR - = [H]). The present DISC address is memorizedaccording to the degreesby whichthe positionischangedfromthe initialstate (DISCaddress
[1
D.
Inthe ternary notation,counting is as follows:
+1 in case ofclockwise rotation
-1
incase of counterclockwise rotation
(Clockwise:1
--7 2 --7 3
~1~
2
(Counterclockwise: 1~3~2~1~3
a)Whenchangingtheturntableposition,the rotatingdirection
is basedon the Table 9 below.
1
2
3
1 /
Counterclockwire
Clockwire
2
Clockwire
/
Counterclockwire
3
Counterclockwire
Clockwire
/
t
DISC
address
moved
b) Output of microcomputer in case of
clockwise/
counterclockwise rotation
~
PresentDISCaddress
PIN NO.
fUNCTION
CLOCKWIRE COUNTERCLOCKWIRE
42 DISC CHG MTR + H L 41
DISC CHG
MiR
- L H
Whenthe turntableis stopped normally,
DISCCHGMTR + =
[l]
DISCCHG MTR-
(41
= [L]
Table 9
-9-
The slowing-down time and the stop position of the turntable rotarymotor are detected by inputofPIN No.43 DISC
TBl
SW. Approx. 2 sec after the turntable starts rotating, the STOP control signal is input. When the disc address moves from [3] to [1], or [1] to [3], the disc address detection pulse (20 msec) is passed through. Fromthe time when DISCTBL SW, asthe Stop control signal, changes
[l]
to to the time when itchanges output of PIN No.42 DISC CHG MTR + for clockwise rotation, and PIN No.41 DISC CHG MTR -torcountsrclockwlse rotationare recognized respectively as the pulse signal with a cycle of approx. 20 msec. (Approx. 100 msec) Ifrotation isclockwise when DISC
TBl
SWchanges to[L],
DISC CHG MTR
+ (42PIN) is set at
[l],
and DISC CHG
MTR - (41 at for
1Omsec,simultaneously. Asa result, the disc table is stopped. For counterclockwise rotation, DISC CHG MTR -
(41 is
set at [L], and DISC CHG MTR
+ (42PIN), at for 10 msec,
simultaneously. As a result, the turntable is stopped.
In the cases a), b), and c) below, DISC CHG + (42PIN) and DISCCHG - (41 are
~et
at to "ERROR". a) Input of DISC TBL SW(43PIN) does not,change within 1 to
6 seconds after the turntable starts rotating.
b) DISC
TBl
is not set approx. 5 seconds
after detecting the STOP control signal.
c) DISC
TBl
is not set at approx. 5 seconds after the address detection pulse inthe turnta­ble position detection mode.
* For error recovery, turn the POWER switch OFF and then ON
again; the normal state is recovered and the turntable position detection mode starts.
* Press the UP and DOWN keys simultaneously during the
"ERROR" display to indicate "rot. ERROR" for
seconds,
AM
OU
OU
aU
·on
o~n
c::::::=
c:::=
~
.c:::::,:)
~
~~cPMo~o
Oc:=O
D
o~oDo~o
o~o
(>
00
OOMR
C:)
~~~O
M~MO~V
MlNlDOM
~~O~lF?!~M
~l~~~
"ERROR" display
F D
Rotary Error Display
OO~~
c:)
~M
U
ou
OU
mk~U~O
o PM
o
:0=0
0=0
M~MO~V
MNOOM
C>
ei
~~O~~AM
~L~le~
00
(Crt={]
F D N
-10-
<D
When the OPEN/CLOSE key is pressed during the disc addressdetection,the tray is opened afterthe address detec­tion. Once the OPEN/CLOSE key is pressed, "OPEN" is displayed.
(g)
If RESET is ON when the tray is open during CD PLAY, the tray is closed and the mechanism moved down to detect the disc address.
® When the POWER key is pressed during the turntable rotation
orthe
movementofOPEN/CLOSE
POWER
becomes
OFF in the Mecha UP state with the movement to the desired position.
@)
When 33PIN(SYSTEM DOWN) becomes [L] to enter the
backup mode due to service interruption or pulling-out of the
AC cord, etc, the present disc address will be memorized until the RESET is ON.
If 44PIN MECHA UP SW shows [H] when POWERis turned
ON again, power supply may have been cut during the turntable rotation. The turntable address detection mode will
start to detect the
disc address 1again.
a) Incase of 44PIN MECHA UP SW = [H], and 47PIN CLOSE SW
=[L]
Aftertheturntable is moved tothe position where 46PIN OPEN MTRis set at [H] and CLOSE
SWat
[H], theturntableis rotated.
After the address detection, the Mecha UP state is attained.
b) In case of 44PIN MECHA-UPSW
=[H], and 47PIN CLOSESW
=[H]
45PIN CLOSE MTR is set at and the tray is closed.
Simultaneously
the
turntableisrotatedtodetect
the
address.
When the CLOSE SW reaches [L], the tray motor is stopped temporarilyto detectthe address. Aftertheturntable is stopped, the CLOSE MTR is set at [H] again to attain the Mecha UP state.
Timing chart for Turntable STOP Control
a) Clockwise rotation
(PIN No.) (Function)
43 DISC
TBl
SW
42 DISC CHG MTR +
2 sec
41 DISC CHG MTR -
Disc address detection pulse in case of Disc 3
-+
1
.-Ji
.
.
t
Slowing-down starts
t
Turntable rotation starts
11
...
1
I
,'tI
100msec
• B
iIill
us
STOP
b) Counterclockwise rotation
(PIN No.) Function
43 DISC
TBl
SW
42 DISC CHG MTR +
41 DISCCHG MTR -
Turntable rotation starts
Disc address detection
pulse in case of Disc 1
-.3
35msec
11
...
2
Slowing-down starts
0
0
Disc 1 STOP
[ Shape of slit for DISC TBL SW ]
Disc 2
STOP Control Slit
120
0
Disc 2 STOP
240
0
Disc 3 STOP
360
0
Disc 1 STOP
Clockwise~
rotation
11
...
3
-11-
-E---
Counterclockwise rotation
Writer and Editor:
&Reliabilitv Control Center of communtcanon & Audio svstems
IA9410-4394NS·HA·M
PrintedinJapan In
Japan
gedruckt
lmprerne
au
Japan
SG·SK.SA.SZ.SC.SL.EX
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