sharp cd c4400 Service 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 CHART OF 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 describedas follows. See 2 and 3.

• The CD changerbasicallyconsistsofthetray(208)whichslides on the

CD chassis (224), and the maingear (238) to movethe

tray. As the maingear 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 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 portsofthemicrocomputer(IC801)

to decode signals and to drive with the use of the above parts.

Under the main gear to control the

screenofconcentriccircleisplaced.The relationofthe main

tray movements, a double

gear rotatingpositionandthe tray position is 1:1. Height of the screen can bechanged withthe trayclosed or at the maingear position corresponding to the tray position where the CD mechanism is movedup/down. As a result,the

LEDlight ofthe photo sensors

PH1and PH2canbe shutorpassedto changeoutput of PH1and

PH2 high and low.Thetray movementis controlledby 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 lightis passed to makethe photo transistor inside the sensor turn ON, resulting in low output

(approx.0.2V). Ontheotherhand,whenthe screenisplacedhigh,

the lightisshutto makethe phototransistorOFF,resultingin high output (5V).

Summary: MTR1

:Controls opening/closingof the tray and up/down of the

CD mechanism.

[MTR1

rotation(clockwise/counterclockwise)

tl d' tl f th . irnu aneous

0 a Ing irec Ion0 e main gear

Opening/closingof the tray

Up/downof CD mechanism

. wo ypes

S' It

two

t f

tvoes S 0

MTR2 :Controls the turntable rotation.

The movementsofthe maingear and the tray,whichare structurallycomplicated,will be explainedindependently inthe othersection.Thereafter,the turntable movement will be described.

PORT .-UN\.,; Port for Macha UP SW(PH2) Port for Tray Close SW(PH1) Port for Tray Open SW(SW1) Port to drive MTR1 45 pin

Port to drive MTR2

Port for Disc Changer SW(PH3)

IIVN

•

ICaDi

47 pin 48 pin

46 pin 42 pin 41 pin 43 pin

OPEN

}J.-COM

IC801

44 pin

OF MICROCOMPUTER

SW1

Tray close photo sensor

NAME

MECHA CLOSESW OPENSW CLOSE MTR OPEN MTR MTR+ MTRDISCTBLSW

Loading motor

(MTR1)

CIRCUIT DIAGRAM

UPSW

-2-

Discselect motor (MTR2)

Disc changer photosensor

253

f-S09

-3-

613 x2

In case the main gear rotates once clockwise while the CD mechanism is not chucking a disc andthe tray isopen, a series 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 continuesrotation, a series of movementsto open the tray is conducted again.

These movements are equivalent to the following actual use condition; when the tray isopen, a disc is loaded on the 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

counterclockwise;

when

the main

gear

is rotated

gear

once

counterclockwisewhile the CD mechanism is chucking adisc 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 ofprocess 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 sideofthetray;the otherone with smaller diameter engages with the rackgear on the rightside of the tray.

STATE

CD stop condition (CD Mechanism UP)

I A I

INU

DIRECTION OF

CLOCKWISE

The tray is opened with CD Mechanism UP. (In case the tray is opened in the CD mentioned left, the main gear is rotated PLAY mode)

The tray is closed with CD Mechanism Down. (In case the tray is opened by stopping CD.)

Movementdirection

To close the tray under the condition as

counterclockwise.

COUNTERCLOCKWISE

To close the tray under the condition as mentioned left, the main gear is rotated clockwise.

GEAR

COUNTERCLOCKWISE

CLOCKWISE

-4-

TRAY~

UP/DOWN

CAM

-..

MTR

160

POWER

OPEN

-e----+--

OFF

STOP

TRAY

LOCK

5=2

ZENE8A

PIN TO

TOUCH

5=6

Fig.

5-1

:Thetray is completelyopen. At

IN GEAR TO FREE

[AJ,

MTR

STOP

FOR TURNING PH1;ON

D/T

DELAYED

5·5

the lowergear with largerdiameterengageswith the rack gear on the leftside of thetray. Tray Open ) ON : Low level Presseitherthe Open/Closekey or the traytoturn

SW1

OFF(HIGH). Then

MTR1

startsrotatingclockwise. By the clockwise

rotationof the main gear, the tray is movedto close.

5-2:Whenthe maingear rotatesto this position,thetray lockpin beginsto enterthe guide ofthe maingear. Ifthe pinfurtherenters

Fig.

the inner part, the tray is locked in the close state.

Fig.5-3 : The maingear has rotatedfurther in comparisonwith the conditionshown in Fig.5-2. Fig.5-4 : Whenthe main gear rotatesto this position,the rack gear of the tray andthe pinion gear of the main gear are disconnected.

Thereafterthe tray is moved the tray lock pin.

MTR1

Fig.5-5 :The tray is completelyclosedat this position.When theClose ) is ON,

regularposition. the mechanism.When the turntable movesto the regularposition,

Ifthe CD mechanismmovesup whilethe turntable is not at its regularposition,theturntable will collidewith

MTR1

starts rotatingagainto advanceto the next step.

willstop untilthe turntablemovesto the

Fig.5-6 :TheZenebapinsetinthe maingearbeginsto contactthe Up/Downcamto movethe CDmechanismup/down.Atthis position,

theCD

mechanism

starts

moving

up.

-5-

CENTER

8 <OPEN.DISC

-----L-

ZENEBA

MECHAN

...

FREE

I8M UP

...

POSITION__..(9)

SKIP

PLAY

I I

1 1

1 i

t I

PLAY.

STOP

MECHA

UP -

MTR

PH2:0N

STOP

...

1--

GEAR

TOUCHTORACK

PH1

:OFF

GEAR

TRAY

LOCK

PIN TO

FREE

PLAY

TIME

OPEN

POWER

6-6

160mm

OFF

MTR

...

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 completed to wait

for CD Play.

6-4 : At the pinion gearwith 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.

: The tray Open SW(SW1) is turned ON to stop MTR1 and to open the tray fully.

6-6

simplifythe description, we explained the case in which the main gearrotates clockwise"afterthe tray isopen. In the actual movements,

however, the

CD STOP condition is main as shown in Fig. 6-3.

-6-

5 6 8 9

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

I I

I I I

I D

I I I

I B I I

I B

D I

II II

I D

I B

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

D D

I I I

Tray Tray

Opening Opening

completed started

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

UUBII"'UI

Input

DISCTBLSW

:_m-IIUN

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

detectthe

disc

~nlr1tr.F\1

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.

NO.43

To detectthe turntableposition bythe input of TBl

SW). The disc table is rotated clockwise MTR

+=[H]) to detectthe pulse which changes from [H] to [L]

approx. 35 msec after the DISC

TBl

NO.42:

SW changes from

(DISC

DISC CHG

[l]

[H].

(In case that the DISC 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].

TBl

SW changes from [L] to [H], and

-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 memorized accordingto 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,therotatingdirection

is basedon theTable 9 below.

1 /

Clockwire Counterclockwire

DISC

address

moved

b) Output of microcomputer in case of

counterclockwise rotation

PIN NO.

42 DISC CHG MTR + H L 41

Whenthe turntableis stopped normally,

DISCCHGMTR + =

DISCCHG MTR-

(41

= [L]

DISC CHG

[l]

Counterclockwire

Clockwire

fUNCTION

MiR

Clockwire Counterclockwire

PresentDISCaddress

clockwise/

CLOCKWIRE COUNTERCLOCKWIRE

- L H

Table 9

-9-

The slowing-down time and the stop position of the turntable

TBl

rotarymotor are detected by inputofPIN No.43 DISC 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,

[l]

changes 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 DISC CHG MTR MTR - (41 at for the disc table is stopped. For counterclockwise rotation, DISC CHG MTR set at [L], and DISC CHG MTR simultaneously. As a result, the turntable is stopped.

to tothe time when itchanges output

TBl

SWchanges to [L],

+ (42PIN) is set at

1Omsec,simultaneously. Asa result,

+ (42PIN), at for 10 msec,

[l],

and DISC CHG

SW.

(41 is

In the cases a), b), and c) below, DISC CHG +

(42PIN) and DISCCHG - (41 are "ERROR". a) Input of DISC TBL SW(43PIN) does not,change within 1 to

6 seconds after the turntable starts rotating.

b) DISC

c) DISC

* 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

TBl

after detecting the STOP control signal.

TBl after the address detection pulse in the turntable position detection mode.

is not set approx. 5 seconds

is not set at approx. 5 seconds

~et

at to

seconds,

"ERROR" display

Rotary Error Display

OOMR

~~~O

M~MO~V

MlNlDOM

~~O~lF?!~M

C:)

~l~~~

~~c

C¢

F D

OO~~

c:)

mk~U~O

M~MO~V

MNOOM

~~O~~AM

~L~le~

C¢

o PM

c::::::=

o~o

Oc:=O

c:::=

o~oDo~o

·on

:0=0

.c:::::,:)

o~n

o~o

0=0

(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

OFF inthe 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 memorizeduntil the RESET is ON.

If 44PIN MECHA UP SW shows [H] when POWER is 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 1 again.

a) Clockwise rotation

(PIN No.) (Function)

43 DISC

TBl

POWER

Timing chart for Turntable STOP Control

becomes

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 After the address detection, the Mecha UP state is attained.

b) In case of 44PIN MECHA-UPSW

=[H]

45PIN CLOSE MTR is set at and the tray is closed.

Simultaneously

When the CLOSE SW reaches [L], the tray motor is stopped temporarilyto detectthe address. Aftertheturntableis stopped, the CLOSE MTR is set at [H] again to attain the Mecha UP state.

Disc address detection pulse in case of Disc 3

.-Ji

the

turntableisrotatedtodetect

SWat

[H], theturntableis rotated.

=[H], and 47PIN CLOSESW

the

address.

42 DISC CHG MTR +

41 DISC CHG MTR -

b) Counterclockwise rotation

(PIN No.) Function

43 DISC

42 DISC CHG MTR+

41 DISCCHG MTR -

TBl

[ Shape of slit for DISC TBL SW ]

Turntable rotation starts

Disc 2

STOP Control Slit

2 sec

...

Disc address detection

pulse in case of Disc 1

35msec

...

-.3

100msec

,'tI

Slowing-down starts

• B

iIill

t·

STOP

Disc 1 STOP

Clockwise~

rotation

120

Disc 2

STOP

360

Disc 1 STOP

Counterclockwise rotation

240

Disc 3 STOP

-E---

...

-11-

Writer and Editor:

&Reliabilitv Control Center of communtcanon &Audio svstems

IA9410-4394NS·HA·M

PrintedinJapan In

Japan

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SG·SK.SA.SZ.SC.SL.EX

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sharp cd c4400 Service Manual

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