Pioneer PD-7050 User manual

© <riw thesereicingthesemodels,pleaserefertothefollowingserviceruiarsisai.
oPD-7050/KU,KC,HEM,HB,SDtypesandPD-7050-S/HEMtype;ARP1331
oPD-6050/KU,KC,HEM,HB,SD,SD/GtypesandPD-6050-S/HEMtype;ARP1329
oPD-5050/HEM,HBtypesandPD-5050-S/HEMtype;ARP1330
ePD-40S0/KU,KC,HEM,HB,HP,SD,SD/GtypesandPD-405G-S/HEM,HBtypes;ARP1332
CONTENTS
1. ICDATA2
2. OPTICALPATHINTHEPICK-UP8
3.BLOCKDIAGRAM11
4. CIRCUITDESCRIPTIONS. 13
PIONEERELECTRONICCORPORATION 4-1, Meguro 1 -Chome,Meguro-ku,Tokyo153,Japan
PIONEERELECTRONICSSERVICEINC.P.O.Box1760,LongBeach,California90801 U.S.A.
PIONEERELECTRONICSOFCANADA,INC.505CochraneDrive,Markham,OntarioL3R6B8CanadaTEL:[416]479-4411
PIONEERELECTRONIC[EUROPE]N.V.Keetberglaan 1, 2740Beveren,BelgiumTEL:03/775-28-08
PIONEERELECTRONICSAUSTRALIAPTY.LTD.178-184BoundaryRoad,Braeside,Victoria3195,AustraliaTEL:[03]580-9911
MT©MAR.1987PrintedinJapan

7,/S\T/4
1.1PD3091A(OnlyforPD-7050andPD-7050-Stypes)
^1 E
INT
GE
STBY |~4~j
XTAL QT
EXTAL [X
NUM [jT
TIMER [IT
A7[X
A6 Dl
A5
CH
A4 QT
A3 cn
A2 n±\
A1 QF
AO rw\
B? cn
B6 cn
B5 Q9
B4 {W\
B3CH
B2 Q2
B1 Qfl
BO Q2
C7/TXfir]
C6/Rx_[H;
C5/CK [77
C4 CH]
C3 CH
02(30^
C1CU
C0f32"
[641 GO
\W\ G1
H3G2
IDG3
"601 G4
(IIIG5
"581 G6
"571 G7
"561 F7
M] F6
tM3
F5
H3
F4
"5T1 F3
fffl F2
"50l F1
~49l FO
\W\ E7
"471 E6
[M]E5
"451 E4
"441 E3
["431 E2
pODE1
ID EO
"40l D7
"391 D6/rNT2
J8] D5
[ITI D4
"361 D3
[HI] D2
"341 D1
HI Vcc
(Top view)
Terminal description
No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
SYMBOL
Vss
RES
_
STBY
XTAL
EXTAL
NUM
TIMER
A7
A6
A5
A4
A3
A2
A1
AO
B7
B6
B5
B4
B3
B2
B1
NAME
REST
SCOR
Notused
TEST
ALAT
ADAT
ACLK
SRES
XLT
Notused
Notused
CLMP
OPEN
INSD
SENS
CPCF
GFS
Notused
I/O
-
S
I
I
-
-
-
I
I
0
0
0
0
0
0
0
OPERATINGDESCRIPTIONI
GND
CPURESETinputRESET[RUNI
SUBCODESYNCinput'[SYNC]
+5V(CPUStandbyinput)STANDBY I RUNI
InternalClockCircuitinput
InternalClockCircuitinput
GND(formanufacturer'suse)
(ConnectedtoSEMS)
TESTModeSelectinput
AttenuationLevelLatchPulseoutput" ] RUNf~"
AttenuationLeveldata"T^TTTT!3!4 ! 5 '• 6 • 7 •
. i ' i ,,ii -i—»» i.
AttenuationLevelclockJIJTJIJTJTJTJ^
Key-DisplayMicrocomputerRESEToutputRUNfRESET.
LSIControlDataRUNPulseoutput "T&yMj™"""
(OPEN)
(OPEN)
DiscCLAMPedSWinputCLAMP 1 NOT
DiscTrayOPENedSWinputOPEN| NOT
SliderInsideSWinputJNSIDE|NOT
LSIOperatingStatusMulti-Modeinput
SUBCODE O-CRC ResultinputNGfOK
FRAMESYNCLockinputNGlLOCK
ConnectedtoGND
2

No
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
p54~"
55
56
57
58
59
60
61
62
63
64
SYMBOL
BO
TX(SO)
RX(SI)
CK
C4
C3
C2
C1
CO
Vcc
D1
D2
D3
D4
D5
D6
D7
E0
E1
E2
E3
E4
E5
E6
E7
F0
F1
F2
F3
F4
F5
F6
F7
G7
G6
G5
G4
G3
G2
G1
GO
NAME
FOK
DATA
SUBQ
CLK
LDON
MUTG
DEMP
CLVH
Notused
KDO
KD1
KD2
KD3
KD4
KS
STS
SCK
SD
LIN
LOUT
Notused
Notused
Notused
Notused
Notused
Notused
Notused
"ATTL
TDXT
"WDWL
PLYL
PASL
Notused
RKS
RKD5
RKD4
RKD3
RKD2
RKD1
RKDO
I/O
I
0
I
0
0
0
0
0
0
—
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
OPERATINGDESCRIPTION
FocusOKinputNG|OK
LSIControlDataSerialoutput R^T^l3!4 l5l6l
7l
SUBCODEQ Datainput
SerialTransmissionclockJFlJTJTJ"LFLF
LaserDiodeON/OFFoutputON [ OFF
MutingON/OFFoutputOFFjON
De-emphasisON/OFFoutputQNlQFF
DuringSpindleCLV-H= "H"|CLV-H
+5V
MainUnitKeyCodeinput(LSB)
MainUnitKeyCodeinput(LSB)
MainUnitKeyCodeinput(LSB)
MainUnitKeyCodeinput(LSB)
MainUnitKeyCodeinput(MSB)
MainUnitKeyStrobeinputQNlQFF
EnableDisplayDataSendinputDISABLElENABLE
DisplayDataSerialTransmissionClockTJTJTJTJLT
DisplayDataSerialoutputHTTTTTTT"
DiskTrayLoadingFree& Break j~]pN'"
IN/OUToutput| OUTI
(OPEN)
(OPEN)
(OPEN)
(OPEN)
(OPEN)
(OPEN)
(OPEN)
FL: [ATT,-,dB]SegmentoutputQN[QFP~
FL: [INDEX]Segmentoutput _QNJOFF"
FL: [MUSICWINDOW]SegmentoutputON\o¥f
PlayLEDoutputQPF[QN
PauseLEDoutputOFFfON"
Connectedto+5V
Remote-ControlKeyStrobeinputON|OFF
Remote-ControlKeyCodeinput(MSB)
Remote-ControlKeyCodeinput(MSB)
Remote-ControlKeyCodeinput(MSB)
Remote-ControlKeyCodeinput(MSB)
Remote-ControlKeyCodeinput(MSB)
Remote-ControlKeyCodeinput(LSB)

1.2PD3092A(Only for PD-6050,PD-6050-S,PD-5050 and PD-5050-Stypes)
D11
D12
D13
D14
D15
R00
R01
R02
R03
R10
R11
R12
R13
R20
R21
R22
R23
RAO
RA1/Vdisp
R30
R31
R32/INT0
R33/INT1
R50
R51
R52
R53
R60
R61
R62
R63
Vcc
nz
m
DI
EH
DE
nr
QI
CX
rr-
rro-
EH
DZ
nr
[14-
[W
nr
nri
DE
DT
ricr
c?r
nr
[23"
(H
r25~
dH
or
[28"
cn
[30"
HE
f3T
o
(Topview)
"641
"631
H3
H3
~60l
J9_
~58]
[ID
56l
^551
B]
"531
JH
M
Tol
"491
~48l
m
"46 1
m
"441
HI
II]
ID
"401
""391
"381
3a
i36~i
fl5]
m
[331
D10
D9
08
D7
D6
D5
D4
D3
D2
01
DO
GND
0SC2
0SC1
TEST
RESET
R93
R92
R91
R90
R83
R82
R81
R80
R73
R72
R71
R70
R43
R42/SO
R41/SI
R40/SCX
Terminaldescription
No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
SYMBOL
D11
D12
D13
D14
D15
R00
R01
R02
R03
R10
R11
R12
R13
R20
R21
R22
R23
RAO
Vdisp
R30
R31
INTO
R33
I/O
0
0
0
0
0
0
0
0
0
0
0
0
0
i
I
I
I
I
-I
0
I
I
NAME
DSG2
DIGS
DIG4
DIG5
DIG6
SEG.a
SEG.b
SEG.c
SEG.d
SEG.e
SEG.f
SEG.g
SEG.h
KDO
KD1
KD2
KD3
Notused
Notused
XLT
SCOR
SENS
DESCRIPTION
Digitaloutput forFL driving [QN|5V -26V
Digitaloutput forFL driving I [
Digitaloutput forFL driving f"~1
Digitaloutput forFL driving | |
Digitaloutput forFL driving__J~TJ
Segmentoutput forFL drivingrONl^OfF-_fiJ
Segmentoutput forFL driving ONOFF
Segmentoutput forFL driving ONOFF
Segmentoutput forFL driving ONOFF
Segmentoutput forFL driving ONOFF
Segmentoutput forFL driving ONOFF
Segmentoutput forFL driving ONOFF
Segmentoutput forFL driving ONOFF
KeyScaninput Key [^ev]5v -26V
KeyScaninput Key
KeyScaninput Key
KeyScaninput Key
(GND)
Bufferpower forFL driving (-26V)
(GND)
LSIControlDataLatchpulse 1 1 ~
SUBCODESYNCS0 + S1 input [SYNC]
LSIOperatingStatusMulti-Modeinput
A

No
24
2b
26
2/
28
29
30
31
32
33
34
3b
36
3/
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
SYMBOL
R50
R51
R52
R53
R60
R61
R62
R63
VCC
SCK
SI
SO
R43
R70
R71
R72
R73
R80
R81
R82
R83
R90
R91
R92
R93
Reset
TEST
OSC1
OSC2
GND
DO
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
I/O
I
I
I
I
0
0
0
0
-
0
I
0
I
0
0
0
0
0
0
0
0
I
I
I
I
-
-I
0
-I
I
I
I
I
I
I
0
0
0
0
NAME
CRCF
GFS
Notused
FOK
LDON
MUTE
DEMP
CLVH
CLK
SUBQ
DATA
TEST
Notused
Notused
Notused
Notused
Notused
Notused
LIN
LOUT
OPEN
CLMP
TNSD
Notused
Notused
WKS
RKD5
RKD4
RKD3
RKD2
RKD1
RKDO
Notused
Notused
DIGO
DIG1
DESCRIPTION
SUBCODEQ-CRCResultinput NGJOK"
FrameSyncLockinputNGlLQCK
(GND)
FocusOKinputNG|OK
LaserDiodeON/OFFoutputONfCHFF
MutingON/OFFoutputQFfJON
De-emphasisON/OFFoutputON[OFF
(CLV/Hselectoutput)OFFfoH
+5V
Serialclock"~~UUULT
SUBCODEQ DataSerialinput ^|Y[T|QJ7]6|¥T41
LSIControlDataSerialoutput[oTTT2~]3|4[5~J6T7|
TESTModeSelectinputTEST| NORMAL
(NC)
(NC)
(NC)
(NC)
(NC)
(NC)
DiscTrayLoading| IN
IN/OUToutputBRAKElOUT
DiscTrayOPENedSWinputOPEN["NOT
DiscCLAMPedSWinputCLAMP[NOT
SliderInsideSWinputINSIDEpSIOT
(GND)
CPUResetinput"Reset]RUN
4-5V
ClockCircuitinput
GND
Remote-ControlStrobeinputIN[0>FF
Remote-ControlCodeinput(MSB)
Remote-ControlCodeinput(MSB)
Remote-ControlCodeinput(MSB)
Remote-ControlCodeinput(MSB)
Remote-ControlCodeinput(MSB)
Remote-ControlCodeinput(LSB)
(NC)
(NC)
DigitaloutputforFLdriving lONl+5^
m?6w
DigitaloutputforFLdrivingJQN[
5

1.3PD3093A(OnlyforPD-4050andPD-4050-Stypes)
Terminaldescription
No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
SYMBOL
D11
D12
D13
D14
D15
R00
R01
R02
R03
R10
R11
R12
R13
R20
R21
R22
R23
RAO
Vdisp
R30
R31
INTO
R33
I/O
0
0
0
0
0
0
0
0
0
0
0
0
I
I
I
I
I
I
-
I
0
I
I
NAME
REPL
Notused
PGML
DIGO
DIG1
SEG.a
SEG.b
SEG.c
SEG.d
SEG.e
SEG.f
SEG.g
KDO
KD1
KD2
KD3
KD4
Notused
Notused
XEJ
SCOR
SENS
DESCRIPTIONI
REPEAT-LEDON/OFF QNIQFF
(NC)
PROGRAM-LEDON/OFF"QNIQFF
DigitaloutputQNIQFF1
DigitaloutputON10FF
SegmentoutputforLEDON|OFFOV 1
SegmentoutputforLED
SegmentoutputforLED
SegmentoutputforLED
SegmentoutputforLED
SegmentoutputforLED
SegmentoutputforLED
KeyScaninputONlOFF
KeyScaninput "QNIQFF
KeyScaninputONlOFF
KeyScaninputQNlOPF
KeyScaninputONlOFF
(GND)
BufferpowersupplyGND
(GND)
LSIControlDataLatchpulse\ |
SUBCODESYNCS0+S1inputISYNCI
LSIOperatingDataMulti-Modeinput
6

No
24
2b
26
2/
28
29
30
31
32
33
34
3b
36
3/
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
SYMBOL
R50
R51
R52
R53
R60
R61
R62
R63
VCC
SCK
SI
SO
R43
R70
R71
R72
R73
R80
R81
R82
R83
R90
R91
R92
piT™"1
Reset
TEST
OSC1
OSC2
GND
DO
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
I/O
I
I
I
I
0
0
0
0
-
0
I
0
I
0
0
0
0
0
0
0
0
I
I
I
I
-
-
I
0
-s
I
I
I
I
I
I
0
0
0
0
NAME
CRCF
GFS
Notused
FOK
LDON
MUTE
DEMP
Notused
CLK
SUBQ
DATA
TEST
Notused
Notused
Notused
Notused
Notused
Notused
LIN
LOUT
OHEN
CLMP
TNSD
Notused
Ms
RKD5
RKD4
RKD3
RKD2
RKD1
RKDO
Notused
Notused
PLYL
PASL
DESCRIPTIONI
SUBCORD Q-CRC ResultinputNOfOK1
FrameSyncLockinputNGlLOCK
(GND)
FocusOKinputNG|OK
LaserDiodeON/OFFoutputQNlOFF1
MutingoutputON[OFF
De-emphasisON/OFFoutputON[OFF'1
(NC)
+5V
Serialclock"UlflilT
SUBCODEQ DataSerialinputT11 1 1 1
LSIControlDataSerialoutput[o]T72~|T
TJi
TESTModeSelectinputTEST 1 NORMAL
(NC)
(NC)
(NC)
(NC)
(NC)|
(NC)
DiscTrayLoading[TFT
IN/OUToutputBRAKE[OUT
DiscTrayOPENedSWinputOPEN[NOT
DiscCLAMPedSWinputCLAMPjNOT
SliderInsideSWinputINSIDE[NOT
(GND)
CPUResetinputResetlRUN
+5V
ClockCircuitinput
(InternalClockCircuitoutput)
GND
Remote-ControlKeyStrobeinputIN["OFF"
Remote-ControlKeyCodeinput(MSB)
Remote-ControlKeyCodeinput(MSB)
Remote-ControlKeyCodeinput(MSB)
Remote-ControlKeyCodeinput(MSB)
Remote-ControlKeyCodeinput(MSB)
Remote-ControlKeyCodeinput(LSB)
(NC)
(NC)
DLAY-LEDON/OFF [QN!
5VOV
PAUSE-LEDON/OFF |5N| 5VQV

2. OPTICAL!WHINTHEPICK-UP
24OPTICALPATHANDOPTICALPARTS2-2FEATUREOFEACHPART
DISC
Halfmirror
Objectivelens
Reflectingmirror
Grating(diffractiongrating)
Laserdiode
Photodiode(withpre-amplifier)
Fig. 2-1 showstheconfigurationof
thispick-up'sopticalpart
Thewavelengthofthelightemittedfromthelaserdiodeis
between780and790nm.Thelightisbarelyvisible.This
lightsourceisspreadintoanellipsefromanultra-small
emissionpoint.Thelightexpandsata setangle.
Theemittedlightgoesthrougha gratingandisdividedinto
threebeamsof0 stepand±1step.
Theotherbeamsof±2,3,andn stepsarealsopresent,but
arelostandnotused.Whenthelightreachesthehalf
mirror,50%isreflected.Theremaininglightpermeatesthe
halfmirrorandislost.
Thelightthengoestothereflectingmirrorwhereallthe
lightisreflectedtotheobjectivelens(finitetype).
Sincethispick-up'sobjectivelensusesa finitesystem
(finitebecausetheLD'sconvergencedistanceisfinite),a
collimatorlensisunnecessary.Theoldmodelsobjective
lensesarecalledinfinitetype.Thelightthatisconvergedon
anultra-smalldiameterspotbytheseobjectivelensesis
reflectedbythediscandreturnstotheobjectivelens.Then
itgoesthroughthehalfmirrorwhere50%ofitreturnsto
thelaserdiode.Theremaining50%oflightgoesthrough
andreachesthephotodiode.
Thishasbeena generaloutlineoftheopticalpath.The
featuresofeachpartareexplainedinthefollowingsection.
+1order 0order
(A)
-1order
Fig. 2-2
(B)
(1)Laserdiode(LD)
Thesizeofpreviously-usedLDswas90.However,a newly-
developedLDwitha sizeof5.60hasbeenintroduced.This
hasresultedina compactandlightweightopticalpath.
(2)Objectivelens
Thecollimatorlenshasbeenreplacedbythefiniteobjec-
tivelenswhichhasa finiteconvergencedistanceforthe
LD'sopticalpath.Thishasresultedinlowercostswhile
preservinghighperformance.
Thefiniteobjectivelens,liketheconventionalinfinitelens,
isa high-performancelensdesignedtoattainsufficientop-
ticalperformanceevenwhentheopticalpartsarenot
parallelwithintheopticalpath.
(3)Halfmirror
Thelightthatreturnstotheobjectivelensgoesthroughthe
halfmirror.Sincethehalfmirrorisa glassplate,itisknown
thatastigmatismiscreatedforthelightwhichentersatan
angle.Theoldmodelsimilarlyuseda glassplateandhada
deviceinitsopticalparttocancelthisastigmatism.
Whereas,thisnewpick-upusestheastigmatismadvantage-
ouslyforthefocusservo.
Consequently,themulti-lensusedinpreviousmodelshas
notbeenincorporatedinthisnewpick-up.Thishasresulted
inlowercostswhilepreservinghighperformance.Atthe
sametime,thepointsofpartshavebeenreduced,improv-
ingdispersionandreliablity.
(4)Axle-slidingactuator
Thepositionaccuracyoftheobjectivelensisanimportant
factorfortheopticalpick-up.Thepick-uphasa slidingaxle
fortheactuatorwhichdrivestheobjectivelens.Accurate
andstablepositioningoftheobjectivelensisthusattained,
resultinginstabletrackability.Also,a smoothfrequency
responsewithlowresonanceisalsorealizedaswiththecon-
ventionalspring-supportedtype.
8

(5)Resinbody
TheCDbodyhasbeenmadewithcomputer-simulated
technology.Tokeepbodychangestoa minimum,resinhas
beenincorporated.Duetothemounting,materialswere
carefullyselectedandthesamereliabilityasthepreviously-
usedaluminumhasbeenrealized.
Theuseofresinhasmadepossiblemountingconfigurations
thatwerenotpossiblewithaluminum.Thereforetheuseof
adhesiveshasbeengreatlyreducedforimprovedreliability.
2-3RFandservosignal
Fig. 2-3
(2)RFandservosignals
Thebeam,whichhasbeenreducedtoanextremely
smallspotbytheobjectivelens,nowstrikesthediscside
onwhichthesignal is. located.Partofthebeamisthen
reflectedbacktotheobjectivelensandphotodiode.A di-
agramshowinghowthisbeamisreflectedoffthediscis
showninfigure2-2.(A)showswhathappenswhenthecon-
centratedbeamisdirectedata pit.Normally,thisreflected
lightwoulddisrupttheoutputlightbeam.Inthelaserdiodes
usedinCDplayers,however,noiseisreducedinstead,result-
inginstableperformance.Thispropertyisveryadvantageous
for.the halfprismwhichallowsonlyhalfofthelightenergy
topass.
Apitand(B)showsthesamebeamwhenreflectedfrom
aspacebetweenpits.Incase(A),thebeamisdiffracted,so
thedarkpartofthebeamdoesnotreturntotheobjective
lens. Instead,onlythecenterofthebeampassesthroughthe
objectivelensandreachesthephotodiode.In case (B), there
isnodiffractionbecausethebeamdoesnotstrikea pit. There-
fore, theentirebeamisreflectedbacktothephotodiode,
producingbrighterbeamthanwhena pitisreached.Inthis
system,thedataonthedisc,whichisrepresentedbypits,
iscoveredintoanelectricalsignalatthephotodiodeaccord-
ingtotheintensity(brightness)ofthereflected^beam.The
RFsignalisthenproducedfromthiselectricalsignalbythe
computationcircuit.
Fig.2-3showshowthefocussignalisdetected.(1)is
whenthebeamfromthelaserdiodeisaccuratelyfocusedon
thediscbytheobjectivelens.(2)showswhathappenswhen
thedisccomesclosertothepickupand(3)showswhathap-
penswhenthediscmovesfartheraway.Thegratingandcon-
cavelens,whichhavenodirecteffectonthefocusingarenot
showninthediagram.
Incase(1),thebeam emanatingfrompoint 01 isreflect-
edanddiffractedonthediscsurfacetoproducethecon-
densedbeam(02).Incase(2),thebeamisdirectedata
pointfartherthanthatofbeam02.Fig.2-4showsthe
propertiesofthehalfmirror.1 through7 showstheshape
ofthebeamateachpoint.Betweenpoints2 and6,which
areina straightline,thebeamiscircularatpoint4.Point6
correspondstobeam02offig.2-3.Ifweassumethatfig.
24showsmode(1)offig.2-3,thatmeansthebeamiscir-
cularbecausethephotodiodeislocatedatpoint4.In
mode(2)offig.2-3,thelocationofthephotodiodeis
closertothecylindricallensthanitwasinfig.2-4.That
meanstheshapeofthebeamisthesameasthatofpoint3
(anellipsethathasa longerwidththanheight).Inmode(3)
offig. 2-3,theshapeofthebeamisthatofpoint5,an
ellipsethathasa longerheightthanwidth.
Fig. 2-4Halfmirror
Thesebeamshapesareshowninfig.2-3.Byperform-
inga (A+ C) — (B+ D)computationusingtheA-Dphoto
diodequarteringelements,thefocussignalisproduced.
Let'sconsiderwhathappensastheobjectivelensis
graduallymovedclosertothedisc.Iftheobjectiveisfair-
lyfarfromthedisc,onlya smallamountoflightwillbe
returnedtothephotodiode.Furthermore,sincethereturn-
inglightisquartered,thefocussignalwouldbe0.
Iftheobjectivelensismovedclosertothediscuntil
point7 offig.24isreached,theshapeofthebeamatthe
photodiodebecomesanellipsethatishigherthanitiswide.
9

Thefocussignalwouldthenbepositivebecause(A+ C)
isgreaterthan(B+ D).However,afterthepeak(vertical
line)isreachedatpoint6,itbeginstoreturntozero.Ifit
becomeszeroatpoint4,thebeambecomesanellipsethat
iswiderthanitishighbecause(A+ C)islessthan(B
+D)andthefocussignalbecomesnegative.Afterpeak-
ingatpoint2,thefocussignalreturnstozerojustaswhen
theobjectivelensistoofarfromthedisc.Focusingsignals
producedintheabovemannerareshowninfig.2-5.Due
toitsshape,thisiscalledanS-curve,animportantgraphthat
expressesthepropertiesofthefocussignal.
Fig, 2-6Detectionoftrackingerror
Fig*2-5S-curve
Sincetherealpurposeofthefocusservoistomaintain
thefocussignalatzero,onlya tinysectionatthecenterof
theS-curveappearsasresidualerror.
Fig.2-6showshowthetrackingsignalisdetected.The
beamfromthelaserdiodeisdividedintothreebeams.The
± 1 orderbeamsoneithersideofthe0 orderbeamareused
toproducethetrackingsignal.Thesetwobeamsare,likethe
0orderbeam,aredirectedatthediscina tinyspot.Inprin-
ciple,thespotsofthetwosidebeamsareanequaldistance
fromthecenterspotasshowninfig.2-6.(Theactualdis-
tanceismuchgreaterthanthatshowninthefigure.)These
twosidebeamsarereflectedanddiffractedandreturnedto
theirrespectivedetectionelementsinthephoto diode. Ifthese
twoelementsdetectthesameintensityfrombothbeams,it
canbeassumedthattheprimary(0order)beamiscorrectly
followingthelineofpitsonthedisc.Fig.2-7showstherela-
tionshipbetweenthetrackandtheoutputofeachphotodi-
odeelement(A,B andC).
Fig. 2-7TrackingerrorandtheRFsignal
10

4. CIRCUITDESCRIPTIONS
4.1ACCURATE FOCUS SERVOSYSTEM
Asa method(theAccurateFocusSystem)forre-
ducingthedistortionofRFsignalsreadbythe
pickup,delayshavebeenappliedtotheoutputof2
photodiodesthatprecedethequarterphotodiodes
andisfollowedbyanadditionoperationinorderto
achieveimprovementsinfrequencyresponce,dis-
tortion,S/N,andsoonaswellastoincreasethe
accuracyofsignalreading.
Fig.4-1
13

•i-1.^
7050.PD-6050
-5050, PD-4050
4. CIRCUITDESCRIPTIONS
4.1ACCURATE FOCUS SERVOSYSTEM
Asa method(theAccurateFocusSystem)forre-
ducingthedistortionofRFsignalsreadbythe
pickup,delayshavebeenappliedtotheoutputof2
photodiodesthatprecedethequarterphotodiodes
andisfollowedbyanadditionoperationinorderto
achieveimprovementsinfrequencyresponce,dis-
tortion,S/N,andsoonaswellastoincreasethe
accuracyofsignalreading. FE
Fig. 4-1
13 1

4.2 1C DESCRIPTIONS
4.2.1CXA1082AS
FOCUSSERVOSYSTEM
Theabovefigureisa blockdiagramoftheFocus
ServoSystem(Fig.4-2).
WhenFS3isON9thehigh-cutfiltergainthatformed
thelow-rangetimeconstantcanbedroppedbythe
operationofthecapacitorconnectedbetweenPins8
and9 aswellastheinternalresistor.
ThecapacitorbetweenPin10andGNDisa time
constantthatboostthelow-rangefrequencyduring
normalplaymode.
ThepeakfrequencyoftheFocusPhaseCompensator
isininverseproportiontothevalueoftheresistor
connectedtoPin239anditspeakvalueisapproxi-
mately1.2kHzincaseof510knresistancevalue.
Theheightofthefocussearchoperationisapproxi-
mately±1.1Vp-pincaseofthetimeconstantsshown
intheFig.4-2.Thisheightisininverseproportionto
thevalueoftheresistorconnectedbetweenPins35
and36.
Thissystemissettoa valuethatis5.7%ofdifference
betweenthereferencevoltageVccfortheinverted
inputoftheFZCcomparatorandVC(Pin1);thatis9
itissetto(Vcc- VC)X 5.7%.
NOTE:
When the value of the resistor connected to Pin 23 is
changed, changes will also concurrently occur in the peak
values of the phase-compensating peak value Focus Servo
and Tracking and Carriage Servo systems as well as in the
fc value of CVL LPF. In addition, the dynamic range and
offset voltage of the OP Amp will also be concurrently
changed.
14

TRACKINGANDCARRIAGESERVOSYSTEM
Theabovefigureisa blockdiagramoftheTracking
andCarriageServoSystem(Fig.4-3).
ThecapacitorconnectedbetweenPins14and15isa
timeconstantthatfunctionstodropthehigh-range
gainwhenTG2isOFF.Thepeakfrequencyofthe
TrackingPhaseCompensatorisalsoinreversepro-
portiontothevalueoftheresistorconnectedtoPin
23, anditspeakvalueisapproximately1.2kHzin
caseof510k12resistancevalue.
TM3orTM4isswitchedONinordertomakea
trackingjumpintheFWD(forward)orREV(reverse)
direction,respectively.Thepeakvoltagetobeapplied
tothetrackingcoilatthistimeisdeterminedbythe
currentvalueofTM3orTM4andthefeedback
resistorfromPin18;thatis:
TrackJumpPeakVoltage=
TM3(TM4)currentvalueX feedbackresistance
'TRKcoilDCR
valueX " ~~
R52//R53
AFWDorREVcarriagekick is.performedby
switchingTM5orTM6toON,respectively.The
peakvoltagetobeappliedtothecarriagemotorat
thistimeisdeterminedbythecurrentvalueofTM5
orTM6andthefeedbackresistorfromPin21;that
is:
CarriageJumpPeakVoltage=
TM5(TM6)currentvalueX feedbackresistance
valueX —
R57
ThecurrentvalueateachSWisdeterminedbythe
valueoftheresistorconnectedtoPins35and36.
Whenitsresistancevalueis 120k 12, therespective
currentvalueswillbeasfollows:
TM3, TM4= ±11MATM5,TM6= ±22MA
15

A200HzLPFisformedatthe0.033/ZFconnected
toPin42and20k O resistoranda secondaryLPF
isformedatthebuilt-inLPF(Pin23:fc- 200Hz
witha 510k 12 resistor),therebyeliminatingthe
carriercomponentsoftheCLVServoErrorsignals:
MDSandMDP.
InCLV-SMode,FSWgoeslowandthefcvalueof
thePin42LPFisloweredtofurtherreinforcethe
filter.
VCOLOOPFILTER,8.64MHzVCO
16

ThephasecomparisonoutputPDOwhichisinput
fromPin34subjectedtoV-Iconversionafterhaving
itsPWMcarriercomponenteliminatedattheLoop
Filter.ItisthenaddedtothecurrentfromPin36
whichisusedforsettingthefree-runfrequencyin
ordertocontroltheVCOfrequency.Thefree-run
frequencyoftheVCOisapproximatelyininverse
proportiontothevalueoftheresistorbetweenPins
36and37.
COMMAND
TheinputdatausedforoperatingthisICactually
consistsofeightbits.Inthefollowingdescription,
however,eachcommandwillbeexpressedusinga
two-digithexadecimalformatof$XX(withX
rangingfrom0 toF).
SOX( @ SENS= "FZC")
Thiscommandisrelatedtothecontrolofthe
focusservo.Itsbitconfigurationisasfollows:
D7D6D5D4D3D2DlDO
00 0 0 FS4FS3FS2FS1
Thefourfocus-relatedSWsareFS1toFS4,
whichrespectivelycorrespondtoDOtoD3
above.
$00WhenFS1=0,Pin13ischargedto:(22fJLA
-11JUA)X 50ktt = 0.55V.
Moreover,if FS2 = 0, thisvoltageistrans-
mittednofurtherandthe© outputbe-
comes0 V.
$02Intheabovestatus,onlyFS2becomes1.
Atthistime,a negativeoutputissentfrom
Pin11.Thisvoltagelevelisstipulatedas
follows:
(22[JLA- 11//A)X 50ka X Resistance
valuebetween(Q),@/50k£2.....Equation(1)
$03Intheabovestatus, FS1 = 1 sothatthe+22
/iApowersupplyiscutoff.
Next,theCharge/RechargecircuitofCRis
formed,andthevoltageofPin13drops
withtimeasshowninFig.4-6below.
Fig. 4-6.Pin13VoltagewhenFS1Changesfrom0
to1
ThistimeconstantisstipulatedbyC34thatis
externallyconnectedto50k 12.
Thealternateissuingof$02and$03enablesthe
creationofthesearchvoltageforfocus.(SeeFig.
4-7)
Fig. 4-7.SearchVoltageCreationby$02and$03
(Pin11Voltage)
17

;-*#::H
1-1 .DescriptionofFS4
ThisswitchissituatedbetweenFocusError
input6 andtheFocusPhaseCompensatorto
receivetheFocusServoON/OFFdata.
$00->$08
FocusOFF<- FocusON
Tosummarizetheabove,thefocuswillbeoptimally
appliedinaccordancewiththetimechartbelow.
(Inactuality,thisIC'sautosequenceisbeingusedso
thesystem JU-COMonlysends$47frompoint®.See
autosequenceonpage20.)
1-2ProcedureforApplyingFocus
Thefollowingexplanationwillpresumethe
belowpolarities:
(a)Thelensissearchingthediscinthefar-to-
closedirection.
(b)Atthistime,theoutputvoltage© changes
fromnegativetopositive.
(c)Furthermore,theS-curveofthefocusatthis
timechangesaccordingtoFig.4-8below.
TheFocusServoisappliedwithPoint(A)ofFig.
4-8asitsoperatingpoint.TheFocusSearchoper-
ationisperformedandtheFocusServoSWisset
toONwhilePoint(A)ofFig.4-8isbeingcrossed.
Inordertoalsopreventmalfunction,thelogical
productoftheoperationandtheFocusOKsignal
isobtained.
ThisICisdesignedsothatFZC(FocusZeroCross)
willbeoutput- asthesignalwhichindicatesthe
crossingofPoint® - fromthe® SENSpin.In
addition,theFocusOKsignalisoutputasanindi-
cationthatfocusisbeingapplied(orcanbeapplied
inthiscase).
Fig. 4-8S-CurveoftheFocus
Drivevoltage
Focuserror
SENSpin
(FZC)
onlyBUSYof$47.
hThebrokenlineswithinthisfigure
indicatethestatusinwhichfocus
hasnotbeenapplied.
FocusOK
(CXA1081)
Fig. 4-9.TimingChartoftheFocusONOperation
1B

1-3.The © SENSPin
ThedatawhichisoutputbytheSENSpinwill
varyaccordingtotheinputdataasfollows.
SinceFOCSINandTRACKJUMPareactually
donebyautosequencing,theoutputof
CXA1082AS,whichusessystemjU-COM,isonly
BUSYof$4X.(Seeautosequenceonpage20.)
SOXinput
$1Xinput
$2Xinput
$3Xinput
$4Xinput
$5X-$7Xin
_>
_>
->
-»
->
put
FZCoutput
AS
TZC
SSTOP
BUSY
->HIGH-Z
Sinceanydataabove$7Xisa commandcode
ofCXD1135,itsconnectionwiththe"SENS"
pinofCXD1135willpermittheoutputof
varioustypesfroma singlepin.
2. $1X( <g>SENS= "AS")
ThiscommandisrelatedtotheON/OFFstatus
ofTGI,TG2andtheBreakcircuit.Itsbit
configurationisasfollows:
D7D6D5D4D3D2DlDO
00 0 1 ANTIBreakTG2TGI
SHOCKcircuit
ON/OFFON/OFF
Brakecircuitdescription
Theseswitchesareusedtoswitchthe
Up/NormalstatusoftheTrackingServogain.
BecausetheServocircuitexceedsthelinear
rangeafterperforminga 100-or10-trackjump,
thesettlingoftheactuatorbecomesextremely
badsuchthatitwill,forexample,returnafter
jumpingonlytentracks,althougha 100-track
jumpwasintended,andsuchphenomenawill
frequentlyoccur.ItistheBreakcircuit,how-
ever,thatfunctionspreventsuchoccurrences.
Byexploitingthe180°phaseoffsetbetweenthe
RFenvelopeandthetrackingerrorduetothe
directionoftheactuatortransversingthetracks
alongtheradiusfromtheinnertooutertracks
anditsreversedirection,theBreakcircuitcuts
outtheunnecessaryportionofthetrackingerror
andappliesa break.
Fig. 4-10.TM7Operation(BreakCircuit)
InnertoOuterTracksOutertoInnerTracks
Fig. 4-11.ExternalWaveforms
19

3*TrackJump
ThisCDplayerisdoingtrackjumpsof1,10,
50, 100viatheautosequenceofCXA1082AS.
Theautosequencesendsthetimingdatafrom
thesystemjU-COMtotheRAMofCXA1082AS
beforehand.Thereforejustbysendingtheserial
dataoftheautosequence,theTRACKJUMP
andFOCSaredrawnin.
Figuresa.tod.showthetimingchartsofthe1,
10, 50,or100trackjumpandautosequence.
Thetimecontrolinthefiguresisdoneby
setting$5XwiththesystemJU-COM.
Autosequencestartsbythesendingof$4Xin
thetablebelow.
CANCEL
FOCUSON
1TRACKJAMP
10TRACKJAMP
100or50TRACKJAMP
D3
0
0
1
1
1
D2
0
1
0
0
1
D1
0
1
0
1
0
DO
0
1
X
X
X
X= 0 FOWARD
X= 1 REVERSE
AutoSequenceTimeChart
a.1 trackjump
20