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

5,6

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)

S' It

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

OPEN

}J.-COM

IC801

SW1

Tray close photo sensor

Loading motor

(MTR1)

Discselect motor (MTR2)

Disc changer photosensor

-2-

253

f-S09

-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

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~

UP/DOWN

CAM

-..

-e----+--

TRAY

LOCK

MTR

POWER

OFF

160

OPEN

STOP

5=2

IN GEAR TO FREE

MTR

STOP

FOR

DELAYED

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

I I

1 1

1 i

-----L-

1--

t I

PLAY.

STOP

...

ZENEBA

FREE

MECHAN

I8M UP

...

MECHA

UP -

MTR

STOP

PH2:0N

...

GEAR

TOUCHTORACK

GEAR

PH1

:OFF

TRAY

LOCK

PIN TO

FREE

...

PLAY

TIME

OPEN

160mm

MTR

POWER

OFF

6-6

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.

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

Tray

Opening

completed

Tray

Opening

started

.Ilrm-"li""""'"'-----------""""""---

I I I

I B

D I

II II

I D

I B

D D

I I I I

I I

5 6 8 9

I. I I I

I D

"""""""'--------------""'"'11 I

I I I

Mechanism

Down---~

-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

:_m-IIUN

OF-___

....

UUBII"'UI

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

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]

[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

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

Inthe ternary notation,counting is as follows:

+1 in case ofclockwise rotation

-1

incase of counterclockwise rotation

(Clockwise:1

--7 2 --7 3

~1~

(Counterclockwise: 1~3~2~1~3

a)Whenchangingtheturntableposition,the rotatingdirection

is basedon the Table 9 below.

1 /

Counterclockwire

Clockwire

Counterclockwire

Clockwire

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,

·on

o~n

c::::::=

c:::=

.c:::::,:)

~~cPMo~o

Oc:=O

o~oDo~o

o~o

C¢

OOMR

C:)

~~~O

M~MO~V

MlNlDOM

~~O~lF?!~M

~l~~~

"ERROR" display

F D

Rotary Error Display

OO~~

c:)

mk~U~O

o PM

:0=0

0=0

M~MO~V

C¢

MNOOM

~~O~~AM

~L~le~

(Crt={]

F D N

-10-

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

42 DISC CHG MTR +

2 sec

41 DISC CHG MTR -

Disc address detection pulse in case of Disc 3

.-Ji

Slowing-down starts

Turntable rotation starts

...

,'tI

100msec

• B

iIill

t·

STOP

b) Counterclockwise rotation

(PIN No.) Function

43 DISC

TBl

42 DISC CHG MTR +

41 DISCCHG MTR -

Turntable rotation starts

Disc address detection

pulse in case of Disc 1

-.3

35msec

...

Slowing-down starts

Disc 1 STOP

[ Shape of slit for DISC TBL SW ]

Disc 2

STOP Control Slit

120

Disc 2 STOP

240

Disc 3 STOP

360

Disc 1 STOP

Clockwise~

rotation

...

-11-

-E---

Counterclockwise rotation

Writer and Editor:

&Reliabilitv Control Center of communtcanon & Audio svstems

IA9410-4394NS·HA·M

PrintedinJapan In

Japan

gedruckt

lmprerne

Japan

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

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