Sharp CD-C4400 Series User manual

Inthe interests of user-safetythe 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.
• TheCDchangerbasicallyconsistsofthetray (208)whichslides
on the CD chassis (224), and the maingear (238)to movethe
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 maingear is driven by Loading Motor MTR1.
Onthe tray (208),the turntable (209)to load adisc 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/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
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
TheTable2belowshowsthe 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
screenofconcentriccircleisplaced.Therelationofthe maingear
rotatingposition andthe tray positionis 1:1. Heightofthe screen
can be changed with the tray closed or at the maingear position
corresponding to the tray position where the CD mechanism is
movedup/down. As a result,the LEDlight of the photo sensors
PH1andPH2canbeshutorpassedtochangeoutputofPH1and
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 passedto makethe photo
transistor inside the sensor turn ON, resulting in low output
(approx.0.2V). Ontheotherhand,whenthescreenisplacedhigh,
the lightisshutto makethe phototransistorOFF,resultingin high
output (5V).
Summary:
MTR1 :Controls opening/closing of the tray and up/down of the
CD mechanism.
[MTR1 rotation(clockwise/counterclockwise) ~J S' It
Rttl d' tl f th . irnu aneous
~ 0a Ing irec Ion0e main gear ~ tf
~ Opening/closingof the tray two tvoes S 0
. wo ypes
~ Up/downof CD mechanism
MTR2 :Controlsthe turntable rotation.
The movementsofthe maingear andthetray, whichare
structurallycomplicated,willbeexplainedindependently
inthe 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)
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 notchucking adisc and the tray is open, 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 continues rotation, a series of movementsto
open the tray is conducted again.
These movements are equivalent to the following actual use
condition; when the tray is open, adisc 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
gear
counterclockwise; when the main gear is rotated once
counterclockwisewhile the CD mechanism ischucking 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 corre-
spond 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 5-1 to 5-6 and6-1 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 rackgear onthe leftsideofthetray;theotherone
with smaller diameterengages withthe rackgearon 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 largerdiameterengageswith the rack gear on the leftside of the tray.
Tray Open ) ON : Low level
Presseitherthe Open/Closekey orthetray toturn
SW1 OFF(HIGH). Then MTR1 startsrotatingclockwise. Bythe clockwise
rotationof the maingear, the tray is movedto close.
Fig.5-2:Whenthe maingear rotatesto this position,the tray lock pin beginsto enterthe guide ofthe maingear. Ifthe pinfurtherenters
the inner part, the tray is lockedin the close state.
Fig.5-3 : The main gear has rotatedfurther in comparisonwith the condition shown in Fig. 5-2.
Fig.5-4 : Whenthe maingear rotatesto this position,the rackgear of the tray andthe piniongear ofthe maingear are disconnected.
Thereafterthe tray is moved the tray lock pin.
Fig.5-5 :The tray iscompletelyclosed atthis position.Whenthe Close ) is ON,
MTR1 willstop untilthe turntable movesto the
regularposition. Ifthe CD mechanismmovesup whilethe turntable is not at its regularposition,the turntablewill collidewith
the mechanism.Whenthe turntable movesto the regularposition,
MTR1 starts rotatingagainto advanceto the next step.
Fig.5-6 :TheZeneba pinsetin the maingear beginsto contactthe Up/Downcamto movethe CD mechanismup/down.Atthis position,
theCD mechanism starts moving up.
-5-

®
CENTER POSITION __ ..(9)
8<OPEN.DISC SKIP PLAY ~
P. ~
I I
I I
1 1
1i
-----L- 1--
tI
PLAY. STOP
6 ... 1
ZENEBA PIN FREE
CD MECHAN I8M UP
6 ... 2
MECHA UP - MTR STOP
PH2:0N
6 ... 3
GEAR TOUCH TO RACK 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 completed to wait
for CD Play.
6-4 :At the pinion gearwith smallerdiameterset 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 inwhich the main gearrotates clockwise"afterthe tray isopen. Inthe actual movements,
however, the CD STOP condition is main as shown in Fig. 6-3.
-6-

IB 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
DD
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 microcom-
puter.
This microcomputerdetectsthe turntable address and
stop positions, and performsstart/stopofthe 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 memorydisappeared
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 detect the 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 of the STOP control signal which appearsapprox.
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-

The turntablepositionis changed bythe movementto rotate
the turntable clockwise by 120 degrees (PIN No.42: DISC
CHGMTR+=[H]),orcounterclockwiseby 120degrees
No.41:DISCCHG MTR - =[H]).
The present DISC address is memorized according to the
degreesby whichthe positionischangedfromthe initialstate
(DISCaddress
[1 D.
In the ternary notation,counting is as follows:
+1 in case of clockwise rotation
-1 in case of counterclockwise rotation
(Clockwise:1 --7 2--7 3
~ 1 ~ 2
(Counterclockwise: 1 ~ 3 ~ 2 ~ 1 ~ 3
a)Whenchangingtheturntableposition,therotatingdirection
is based on the Table 9 below.
123
1/Counterclockwire Clockwire
2Clockwire /Counterclockwire
3Counterclockwire 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 +HL
41 DISC CHG
MiR -LH
Whenthe turntable is stoppednormally,
DISCCHGMTR += [l]
DISCCHG MTR - (41 =[L]
Table 9
-9-

The slowing-down time and the stop position of the turntable
rotarymotoraredetected byinputofPIN 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.
From thetime when DISC TBL SW, as the Stop control signal,
changes
[l] to tothe time when itchanges output
of PIN No.42 DISC CHG MTR + for clockwise rotation, and
PIN No.41 DISC CHG MTR -torcountsrclockwlse rotation are
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. As a 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 DISC CHG - (41 are ~et at to
"ERROR".
a) Input of DISC TBL SW(43PIN) does not,change within 1to
6seconds 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 in the turnta-
ble 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:::::,:) ~
~~c PM o~o Oc:=O D o~o D o~o o~o
C¢
(>
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
oPM o
:0=0 0=0
M~MO~V
C¢
MNOOM
C>
ei
~~O~~AM
~L~le~
00
(Crt={]
F D N
-10-