Sony TRINIT PVM-20M7MDE User manual

PVM-20M7MDE
SERVICEMANUAL AEPMode/
ChassisNo.SCC-J55A-A
IIHll111::11:Trinitron
SPECIFICATIONS
Videosignal
Color system
Systema> PAL (Display system:625/10012:1)
625/50/2:1(Displaysystem:625/
100/2:1)
625/50/1:1 (Display system: 625/
50/1:1)
a) Systemspecificationsofeachsystemareexplainedon
page31.
Resolution 625/50/2:1:550TVlines
625/50/1:1: 800 TV lines
Aperturecorrection
0dBto6dB
Frequencyresponse
625/5012:1:6.8 MH, (-3dB)
625/50/1:1:20.0 MHz (-3dB)
Synchronization AFC time constant
1.0 msec.(FAST),
2.0msec.(SLOW)
Pictureperformance
Nonnal scan 7 % over scan of CRT effective
Underscan
H.linearity
V.Jinearity
Convergence
screen area
5 % underscan of CRT effective
screen area
Less than 5.0 % (typical)
Less than 5.0 % (typical)
Centralarea:0.5mm(typical)
Peripheralarea:0.6mm (typical)
Rastersizestability
H: 0.5 %, V: 0.5 %
Highvoltageregulation
0.5%
CRT
CRT type HR Trinitron
Aperture grill (AG)pitch: 0.3 mm
EBU standardphosphor
Colortemperature 6500 K/5600 K/USER 1/USER2
-Continuedonnextpage-
TRINITRON®COLORVIDEOMONITOR
SONY

PVM-20M7MDE
Inputs
LINEA
VIDEO IN ENC connector(xl), lVp-p +3 dB,
-6 dB, syncnegative
AUDIO IN Phono jack (xl), -5 dBuh),more
than 47kilo,.ohms
LINEB
Y/C IN 4-pin mini-DIN(xl)
See thepin assignmenton thenext
page.
AUDIO IN Phono jack (xl), -5 dBubl,more
than47 kilo-ohms
ROB/COMPONENT A
R/G/B channels
BNC connector (x3)
0.7 Vp-p +3 dB, -6 dB
Syncon green:0.3 Vp-p,
negative
R-Y, B-Y channels
BNC connector (x2)
0.7 Vp-p+3 dB,-6dB
Y channel BNC connector (xt)
1.0 Vp-p +3 dB, -6 dB (standard
colorbar signalof75 %
chrominance)
AUDIO IN Phonojack (xl), -5 dBubJ,more
than 47 kilo-ohms
EXT SYNC BNC connector(xl)
Compositesync4 Vp-p±6 dB,
syncnegative
ROB/COMPONENT B
R/G/B channels
BNC connector(x3)
0.7 Vp-p +3 dB, -6 dB
Syncongreen:0.3Vp-p,
negative
R-Y,B-Ychannels
BNC connector(x2)
0.7 Vp-p+3 dB,-6dB
Y channel BNCconnector(xi)
1.0 Vp-p+3 dB,-6dB (standard
colorbar signalof 75 %
chrominance)
AUDIO IN Phonojack (xl), -5 dBubl,more
than 47 kilo-ohms
EXTSYNC BNC connector (xl)
Composite sync 4 Vp-p ±6 dB,
sync negative
RS-232C 9-pin D-sub (xi)
Seethepin W1signmentonpage31.
b) 0 dBu = 0.775 Vr.m.s.
Outputs
LINEA
VIDEO OUT
BNC connector (xl), loop-through,
automatic 75 ohms termination
AUDIO OUT
Phonojack (xl), loop-through
LINEB
Y/C OUT 4-pin mini-DIN (xl), loop-through,
automatic 75 ohms termination
AUDIO OUT
Phono jack (xl), loop-through
ROB/COMPONENT A
R/R-Y/G/Y B/B-YOUT
BNC connector (x3), loop-through,
automatic 75 ohms termination
AUDIO OUT
Phonojack (XI), loop-through
EXT SYNC BNC connector (xl), loop-through,
automatic 75 ohms termination
Speaker output Output level: 0.8 W
G~nera_l
Classification of equipment
- Type of protection against electric shock:
Class I equipment
- Degree of protection against electric shock:
Type B equipment
- Degree of protection against hannful ingress of
water: Ordinary equipment
- Degree of safety of application in the presence of a
flammable anaesthetic mixture:
Not protected equipment
-Mode of operation:
Continuous operation
- Information concerning type and frequency of
technical maintenance:
Not need maintenance equipment
- Main power switch:
-2-
Functional switch
Power consumption
AC 150W (0.8 to 0.6 A)
Power requirements
220 to 240V AC, 50/60Hz
Operating temperature
0 to +35°C (32 to 95°F)
Storage temperature
-10 to +40°C (14 to104°F)
Relative humidity 0to90%
Pressure 860 to 1060 hpa
Dimensions Approx. 450 X457.5 x503 mm
(w/h/d)
(173Ax 18¼ x 19¾ inches)
not incl. projecting parts and
controls
Mass Approx. 34 kg (741b 15 oz)

AccesorysuppliedAC powercord (I)
AC plug holder (1)
Splash-proofcovers(2)
Controlpanelcover(1)
Panel hinges (2)
Instructions for Use (I)
InterfaceManualforProgrammers(1)
QuickReferenceCard(1)
Double-sidedadhesivetapes(4)
Sales Companies Guide (1)
Pin assignment
Y/C IN connector(4-pin mini-DIN)
Pin No. Signal Description
Y-lnput 1 vp-p,s)'ncn8gaifve,
75ohms
CHROMA 300mVp-p,burst
subcarrier-lnput Delaytlme betweenY
andC:wlthln0:1: 100
nsec.,75ohms
GNDforY-lnput GND
GND!or GND
CHROMA-Input
RS-232Cconnector(D-sub9-pin)
@
Pin No. Sianal
RX(Remote computer ➔ Monitor)
TX (Monitor ➔ Remotecomputer)
GND
TALLYON/OFF'I
c) ON whenpin5 andpin 9 are shorted.
-3-
PVM-20M7MDE
System specification
Sighnal timing chart for 625150/1:1
H (Horizontal)
V(Vertical)
,·+-+-+·-+-+·+·+·+·+·+·+·,f•+·,
~lirir
Signal timing chart for 625/100/2:1
H (Horizontal)
V (odd field)
=-+-+-+·,·+·+·+·+·+·+·,
~I{
V(evenfiled)
="'+"'+"'+"'+"'+"'+"'+'"+-+·'+''<
~w i
DelaysbyH.SYNCwidth,
comparedwlth112H
Design and specifications are subject to change
without notice.

TABLE OF CONTENTS
Section
1. GENERAL
Features----------5
Location and Function of Parts and Controls •· ··· 6
Preparation ... 9
Operation 10
On-Screen Menus ............. 11
Troubleshooting 16
2. DISASSEMBLY
2-1. TopCoverandRearCoverRemoval ......................... 17
2-2. Terminal Board Removal------ 17
2-3. J,HBoardsRemoval -------17
2-4. PictureTube Removal -------18
3. CIRCUIT DESCRIPTIONS
3-1. A(l/4)Board(pagel) -------19
3-2. A(2/4) Board(page 2) -------19
3-3. A(3/4) Board(page 3) •· -----19
3-4. A(414) Board(page4) -- •· -----19
3-5. BBoard----------20
3-6. PBoard ------ ············•·21
3-7. C,G,HandQBoards ·············································•·21
3-8. PowerSavingCircuit •··············································•·21
3-9. Trouble Detection Circuit •······• • •··························21
4. SET-UP-ADJUS-TMEN'FS
4-1. Note -----------22
4-2. WorkingConditions . .... 25
4-3. LandingAdjustment •···26
4-4. FocusAdjustment •· ....................27
4-5. ConvergenceAdjustment ..............27
4-6. 02 Adjustment ·· 29
4-7. WhiteBalanceAdjustment 29
4-8. SubBrightnessAdjustment 30
4-9. SubContrastAdjustment···· · 30
4-10.+BPowerLineCheck 31
4-11. HV.REF Adjustment... 31
4-12. HV. PROT.REF Adjustment 31
4-13.HV.PROTCheck•• 31
4-14. IK. PROTCheck 31
5. CIRCUIT ADJUSTMENTS
5-1. ABoardAdjustment-------32
I. Preparation---------33
II. G2Adjustment ----- ................. 33
ill. HorizontalOscillatingFrequencyAdjustment •····34
1.PAL FOAdjustment ..........................................34
2. l125FOAdjustrnent·· ......................................34
3. FREE-PALFOAdjustment---- 34
(CAUTION)
SHORT CIRCUIT THE ANODE OF THE PICTURE TUBE AND THE
ANODE CAP TO THE METAL CHASSIS, CRT SHIELD, OR CARBON
PAINTED ONTHE CRT, AFTER REMOVING THE ANODE.
WARNING II
AN ISOLATION TRANSFORMER SHOULD BE USED DURING ANY
SERVICE TO AVOID POSSIBLE SHOCK HAZARD, BECAUSE OF
LIVE CHASSIS.
THE CHASSIS OF THIS RECEIVER IS DIRECTLY CONNECTED TO
THE AC POWER LINE.
Title
~
IV.FocusAdjustment-------35
V. Deflection SystemAdjustment---- 35
l. DeflectionSystemCheck -----35
2. VerticalDeflectionRoughAdjustment•·· ..... 35
3. HorizontalDeflectionRoughAdjustment •· ···· 35
VI. SignalSystem Adjustment -----36
1. CrystalOscillatorAdjustment... ····· 36
2. PAL Color DecodeAdjustment •· ..... 36
3. PALColorLeve!Adjustment •· ..... 37
4. MatrixAdjustment ------38
5. PAL Y/C ColorLevel Adjustment··· ..... 39
6. NTSC ColorDemodulationAdjustment•·· ····· 39
7. NTSC Color LevelAdjustment •· ..... 39
8. NTSC Y/CColor Level Adjustment··· ····· 40
9. ComponentColor LevelAdjustment-I
(NlO/SMPTE) ----- ····· 40
10. ComponentColor Level Adjustment-2
(Betacam)------ ..... 40
11.ROB ColorLevel Adjustment .. ..... 40
12. HD ComponentMatrixAdjustment•·· ..... 41
5-2. G BoardAdjustment•·· .....41
6. DIAGRAMS
6-1. BlockDiagrams(l)-------43
BlockDiagrams (2) -------47
__B1ockDiagrams(3) ------~SI
BlockDiagrams(4) .. ----- 54
6-2. Frame SchematicDiagram ·· ---- ..... 57
6-3. CircuitBoardsLocation ------59
6-4. PrintedWiring Boardsand SchematicDiagrams •· ··· 59
•ABoard-------- ..... 60
•BBoard -------- ..... gs
• Q, P, J andHBoards -------97
•CandXBoards --------104
•GBoard ---------109
6-5. Semiconductors----- ··· 113
7. EXPLODED VIEWS
7-1. Chassis----------115
7-2. PictureTube---------116
8. ELECTRICAL PARTS LIST·-·. ...117
rcAUTION : Double-pole/neutralfusingJ
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY SHADING AND MARK .& ON THE
SCHEMATIC DIAGRAMS, EXPLODED VIEWS AND IN THE PARTS
UST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE
COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS
APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS
PUBLISHED BY SONY. CIRCUIT ADJUSTMENTS THAT ARE
CRITICALTO SAFE OPERATIONARE IDENTIFIEDIN THIS MANUAL
FOLLOW THESE PROCEDURES WHENEVER CRITICAL
COMPONENTS ARE REPLACED OR IMPROPER OPERATION IS
SUSPECTED.
-4-

I
"'
I
HR(Hlgh ~solutlon) Trinltron•>pk:turetube
TbelllOllitrlfisequlppedwilbtheHRTrinllrrmtube
~dev..lopodforprofo.,ionaluseinbroadca,IIIlg
Toe HR 'llinilroll lllbe with ApertureGrill (AG) pitch
of0.30mmprovide•ahigbreaolulionpicture.
Dtgltalcombfllter
WhenPALvideosignal,aren,ceivod,adigllal.:omb
mwactlva!e!ltogiv,,amoreaceurateY/Cseparation
'Ibiscontribntestodecleasinglbeverlioalcross
luminancephenomenawhidlcannotbereQJOvedby
tboaoalogcombfilw. Thedigitalcombfillergivesa
llighre,mlulionpict=.
lmp,ovementoflleldflleker
Witbthefielddoubloseonningsystemincruporated.
themonitorcanm11<hfllducellickerpbenomenawhicb
causesevereeyesfatigue.e,peciallyiosiillimage
ob,em,tionandforlooglimooperatioo.
Input/control connectors
Analog ROB/COMPONENT Input connector•
AnalogRGB siglllllsor componeru(Y, R-Yand 11-Y)
•l!lna!sfromvideoequipmentcanbeinputtolbese
coooe,;tms.lnpntsignabcanbeselectedusiIJgtbo
cporationbuttonsandibcon-&ereenmenu.
Elllernatsynclnputcomecton,
When an RGBor wmponentsignal is input arid the
syocsignal,ssettoexternalintbeon.«<ffllmellll,the
monitorcauoperateaccortlingtoasyocsignal
suppliedfromanextemalsyncgenorator,
Automatic termination
(conneetorwlth*markonly)
TheinpU(C<JnnectoJistem,imtedat75ohm•in&ide
whennocablei,cowiectedlolheloop-lbrougboutput
connector,Whonacab!eisronnectedtoanoutput
~~:::.:itor, the 75--ohmtermination is automatically
l)"Tn..two"i,arcgi>lo:rodliademorkofS<>oyCocporalioo.
SECTION 1
GENERAL
The operating instructions mentioned here are partial abstracts from
the Operating Instruction Manual. The page numbers of the
Operating Instruction Manual remain as in the manual.
RS-232Clntet1ace
Themonitorcanbcrcmotelycontrolledbyapersonal
rompute:rviatheserial.re,no1ein1ertace,
Forderuiledmfo"""6""onll,;r""""""'1,,r,farro,h<
,appliedimeifa<emanual.
Powereavlng
Onsenoinglheabsenceofsyncsig:nal,foracertain
period,tbemonitoretrter,stand-bymodetoreduce
powerconsumptionloappwx.25%.Tbiscontributes
tolhepowersaviog.YouC311selecteitherof30
minntesot!Ominn!esfromtbe-=menuasa
periodofsyncsignalsabseru:e..
Aulomldlcrei:eptionolaprogressivesc:an
(62Sl50/1:1)slgnal
'Ibemooitorcanreceiveaprogressivesca11sig,,al
wheotbe625/50/i:lsignaldes18tJated1111he
specilicationsoftbemooitorisinpul 'lbisallowsfor
•y•tem""pansiru,.
On~reenmenus
VariousmonitorsettingsC311bechangodbyusingon,.
~,;,:~no:;!.=..
00
::.;i;,~=:tt"
p,ssib!etoviewanimageor""""'nofdatainits
entirely.
Automumualdegausa
Degaussingoflhe""""'nisperfmmedautomatkaliy
whenthepoweri,turnedon.Whentberolordisplay
becomosnon,.unifwm,degausslhemonitormanually
by pres,ing the DEGAUSSbutton.
Flvemenulanguagea
Yoncanseleotlbelanguageusedfortbeon.scn,en
mcousfrnmfivelanguages::E:iglisb,Gonnan,French,
ltaLiooaodSpOl!ish.
Spluh-proolcOffl'Qndcontrolpanelcover
Themorutorcanl:\"coven>dwitb,plash-pu,ofcoven
~~~=~::;;~==:over
protectsthecontralb11Uonsonthofrontpaoelfrom
il!lldvertentoporatlon.
~~~~~erel."::is,nppliedtohelpy<>u
undemandlhelne/'ucorulguratlon3Ildopentling
::k°!r':::l;:::!"a~=\:nual.The
conv<oien<:eplacewitbasupplieddouble-&ded
adhestve!ape.
E!Astandard19-lnchntckmountlng
~:!·!,Tu~::~=t::-pch
EIAstambrdrad'.
Ford&J&oomo•,it"'8•ref"t,,t/,einnr,,r#o,,..,,,ual
,.pt,1,ed,.;,J,1be,J;,k,.,;J.1,i,

-6-

I
--J
I
Location and Funclion of Parts and Controls
9Menu aper•llon buttons OCDAPEFITUREcontrol lulob
Pre••1omakelbemetmappoar. AdjusUlbe•harpness<>flbe"""'on.
~~W::11.lbepn,vious.screen,pn,osthe MENU ForMP>to..al•QdjlLII,,.,,,,,,u "AdJlln"""'• onpav 18.
GI~BRIGHT (brlghlness)control knob
Forcletai1.dinf°"""'""'"""""""F,.,,,;,,,,1,u=,ue Adjustslbebrlghmes•oflhescree,,.
"M,nuop,-1<111<>nb1inom•,.,,pogeJ9. F,,rhowo,n.akadju,/m,nt,«••"A4ft,,lltWll"..,P"IJ"l8.
~
··-'.
"
~ESETh<Mon boAton
(P,.,..tl+ .... ..,__her.)
0POWER SAVING tndlcalor
Thi•indlcarorligtgswbeothe POWERSAVING
fu..,lion!aac~ve.
0@106 POWERawltchandlndlcator
l'ress1o1Willhemolliloron.Thegn,enpower
iodicatorlighls
Pressagain1oturolbepoweroff.
CitDEGAUSSbutton
~ ...~•bu-momomarilytode,nagnefuelbe
Waitfuratlcaat!Ominuwbeforepressinglb!abulloll
-·
0 UNDERSCANbutton
l'rasstbisbullOOtodisp!aytbewbolepicture.Tho
bllll<>n;ndicalorlights.ThBdisp!aysiieisroducedby
approxlm31ely5%1i<11ballbefourcomersoflbe=~
on,Yisible.
1'1esslbjsbuttooagain1orcsetthedi•pJaytolhe
nonnalsi>e.Thebnttonindicatorgoosout
0REM<ITElndlcator
~;~~~~~~~~<:;~~-set
ID@CHROMA(<:hramlmmce)control knob
AdjustslberolorinlCJ!SityoflbevideosignaL
Forbow1om,JU~..,."A<!l•-•mpag,lll.
80CONTRAST control knob
Adjuststbecomrastoflbe1•:reen.
Forhoo,o,,,.,,J:6at!J,,.,,,,,,111.="A<!i••""'"'"m-lB.
eAVOWME control knob
Adjustslbespeakervohuno.
Forlrawll>n.akadj,,.,,,,.lll.«<"lliiJ,,.,,,,.111"..,pa&"lll.
·..,ga--
-
::::.c:-:::.~=~"'":11"~~
0"'-ACIN(lnlat)c:onn&etor
~-:.~:i:.~ACpowercoidlDlhisCOIIIX"10t
8UNEAc:onnectora
Iopntconnecrornforlbecompo,ile\ideoaodnndk,
~~:'mb<iiS::fe:~~~~:tms.
presstheLINEAfultOUonlhefmutpanel.
VIDEOIN (iopUl)coonedOl'{BNC-lype)
Connecttothevideooutputconnectoronvideo
equipment,suchasaVCRoracolorvideoc/l!Dera.
:p:~~n"::!°"m::~to the video
i
f)ijEMOTE.......torlls-232C
{The""/v-mari<mi.oltcaul<lmalfc"""'lr-.>tioo.)
VIDEO our (outpul)<olUK<'lor (BNC-type)
l.oop--thronghoutplltconnt,:turoflbeVIDEOIN
con!)eelor.Con110Cttolbevideoinputcounectorona
VCRoranotbermonitor.
Wheolbe,;ableisconrn,ctedtotbiiconnor;:tor,the
75-ohminputlemlinalionisautomaticallyrelensed,
audtbosignalinputtotheVIDEOINconnecto:ris
ontpntfromthiscoonO<tor.
AUDIO IN (lnput)«>1111cdor(pbonojatk)
Co11nect1otheaudioontputconncctorm1aVCRor
O!hereqn;pmeoLForaIDO!"throUgbconnection,
connecttolbeandiooutp11tonanolhermolUUX
AUDIO OUT (output) connector (piton<>Ja<k)
Loop-throngboutput OIi theAUDIOINconll<!<."IDr.
CoMOcttolbeaudioinpnlconnectorofaVCRor
anothermooitor.

I
0,
I
Locationand Functionof Partsand Controls
E)UNEBconnector,.
Inputconnect<Jrsfor!beYIC .. paratevideoandaodio
slgnlllsandlbeirloop-lhrougbootputconnector,
Tomonitorlbeinput,ignalfedthroughtheoe
connectou, presstheLINEB button on the fKIIlt
....
YICIN(lnpnt)roo,-,lor(4"Plnmlnl-DIN)
ConnecttotheY/Csepamteootputconnectorofa
colorvi<leocamera,VCR.orolhefvidooequil'lllenL
Fwpi,,<=ignm,nt,ofd,,YfC/Nc<>nne<-,m,•rtcfN
"""""'tor/4-,,.,,mini-DIN}"onpag,30.
YIC Otrr(oulpot) conneclol' (4-pln mild-DIN)
Loop-tbro"ghoulputoflhoY!CINconnector.
CounectlolheYIC..,JlllGlleioputconneeloronaVCR
or3JIO!hermonitor.
Wbenlhecab!ei,connectedrotbiscolll10ctor,tbe
75--ohminpnttemtinatiooisautomalically,elemed,
andlhesignalinputlolbeY/CINconnectorisoulput
frowlhisconnector.
AUDIO IN (ioput) con"""tor (phono Jack)
Connecltolbeaudiooutpulconnec..,.,onaVCRor
otbereqUipmenLForaloop-throughconnection,
coonectlolhoaudiooutputonanothermonitor.
AUDIO OUT (output) connector (pbonojar:k)
Loop-lmoughou1putoftheAUDIOlNcoooeelor
ConnecrlolbeaudioinputcormectoronaVCRor
anothermoniror.
0 RGB/COMPONEHTA connectors
1npurconoec1<JrsforlbeR/GJBSJgnaisorcon,p:,nent
,igrnd,.extemalsyneslgnalsandaudio,igoalsaDd
tJ,eirloop-lhroughoutputconnecklrs
Tomonitortheinput,igna]fedthroushthe ..
connectors, pressIbo RGB/COMPONENT A button
onthefm:ntpancl.Then,seleetoneofthefouritems
RGB -EXT SYNC. RGB -SYNC ONG, COMP -EXT
SYNC or COMP -SYNC ON Yon the RGB SYSTEM
-RGBA-menu.
R/GJBINnrR-Y/YIB-YIN(inp11t)co1U1octors
(BNC.type)
When RGB -SYNC ONG or COMP -SYNC ON Y is
sclCC!edon the RGB SYSIBM -RGB A- meou, the
:::_operarosonthe,yocsij;nalfromlheGf'{
When RGB-EXT SYNC or COMP-EXT SYNC is
sele<:led on the RGB SYSTEM -RGB A· menu, the
monitorope,atesonanexternalsyr.,,ignal.
To,nanltartheanai<,gRGBsignal:C-onnect!Othe
analogRGBourputconnectononavideoaunera.
VCRorother¥idoooquipmeot
Tomu11ltorlbecnmpom,ntslgnal:Connect!Otbe
R-Y/Y/B-Ycompo11e11tou1putconoeelo<lioovideo
--
R/GIB OUT orR-YIY/B-Y OUT(oolpul)
connedon(BNC-type)
~i::~:.tsoftheR/R-Y,GIYINan<"IB/
When cables are come<:tedto theseconnectors, the
75-ohmioputlecmiru,tiooisauromatiCllllyreleased,
andtheS1gnalmputsto!bcR/R-Y,G/YINandB/B-Y
!Ncoonectorsereoutputfmmtheseconoectol'S-.
Toootpotlltea:nalogRGBslgnal·Coonecttotbe
::R,:,:_utconnector,onavideoprintcror
To olllpul the componellt signal: Cormect to the R-
Yf'i /B-Y componentlllput cooneclom oo vidoo
equipment
AUDIOIN(input)"°""octor (phonojack)
Comte<tlotbe3\ldiooutputconnector,onvide<>
egaipmeotwhcothcanalogRGBorcomponeo1signal
ISIDJ'UI.
AUDIO OUT (output) connector (phono jack)
l..oop-througboutputoftheAUDIOINcoruiector.
~==•dioinpotcom,ectoronaVCRar
EXT SYNC IN (emrnal. syn< Input) coooeclol"
(BNC-type)
Connecttothesynesignaloutpulonavideocamora,
VCRrrrolbervideoequip,nen~whenthis!DOJ!itor
ope,ar,,sooane~temalsyocsij;n31.
Tousetbesyncsignalfedlhrougbtbisconnector,
select RGB -EXT SYNC or COMP-EXT SYNC on
!he RGB SYSTEM -RGB A- ment1.
EXT SYNC OUT (externalsyocoutput) .,._lleclor
(BNC-type)
Loop-through Outputof the EXT SYNC IN connector.
Conoecttothebxtemalsyooinpurconnectnronvideo
equipmentroh!=syncllronizedwithtbi:smonitor .
=:~t~~=:.~1:ci~==.:;:"m!!~
tolbeEXTSY~IN<OtUteClorisOl!tputflumthis
~~.
~~~T!~::~~~~ln)
~,/;::::;f.':t"themnnitor'Nith
F,;;,,':;!1/!:'f;m:::;-,,.',trlo/M,upp/ied"lmeif=
!:'';ll'n7:::l:,1!!lE/'-p;,,°r:f::"':;:Ii.""
:U~coe:?:!~:-1" ~==
0:com('}DOllt
signals,exlermil.syoc,ij;nal,andaudioslgnal,,.
Tomonitortlu,!;nput,ignalfedtbroughlhesc
connectors, pre!..the RGB/COMPONENTB buttonon
~~~~J~~~~ti;:;~~~~~RGB
sYNC or COMP -SYNC ON Yon IboRGB SYSTEM
-RGBB-menn'.
Ford,tode,Ji,~on.,,,,minp,su-"fo~~,,1,e
rii,wltob<-ip,«irl>,wghlhel/.GIJ/COMPONI!NI"
conntttor,"""Jj<l#ZZ
R/GIBINor~-YIYJB-.YIN(lnpu1)cotu1echlrs
(BNC-1.yP")
When RGB -SYNC ONG or COMP-SYNC ON Y is
,elected on tho RGBSYSTEM-RGB B- menu,tho
~=npcmleSonasyncslgoalfiUJDlheG/Y
When RGB -EXTSYNC orCOMP -EXT SYNC is
:!::~~!!'!1;!'!1ai~~!~~u,the
Tomooltortit~analogRGB slgml: Connoctto the
ToS:l°EO:~~:::nc::::.
Y/YIB-Yco)m,onentoutputconneetorsnnvideo
equipmeoL
AUDIOIN(lnpot)eonll<>Clor(phoaojlOCk)
Coonoclklthe3!1dwou1pUtconnectnraonvideo
equipmentwhenlboaoalogRGBorcomponentsigoal
isiopuL
EXTSYNCIN(mernal.syncinpul)connector
(BNC-type)
Connectrotbosyncsighalou1putmtavideocamern,
VCR or other video equipmeoL when ibis monitor
operatesonanexler:nali;yncslgnal
Touselhcsyncngmdfedtb:uugbtlii,conoector,
..,lect RGB -EXT SYNC or COMP -EXT SYNC on
theRGBSYSIBM-RGBB-menu
O,!,J@aroundterminal
C-onne<ltolboequipot,,ntialpluglobriJlglbevarious
pansofasy,remtntbesame poktttia1.
S.e"Symi,,,lron/M~n""""P<'K~4.
13

I
"'
I
Thillsectionei<plam•preparationreqwredbcfore ID!III
mtemptingtooperatethemonitor,andbowtocollJIIIOt Alw,rystumofflhepoMrofthemonitorundolber
loothereqnipwenl eqllipmentbeforeatlemptingtomakecowiections.
-J!IIIIIRII
Comeci the snpplied AC poMroord to the~AC IN
COIJne<torandtoawalloutlel •UsethesnppliedACpoweroo.d
•S.tthepower.witdttoOFFbeforecollllll<tingor
rernovinglheACpowe,cord.
•Malesnrethallhepower,upplycoilfOllllSlolhe
voliageratingin"SpecifL<atious"oopage29.
To connect 11nAC powercord securelywith the AC plugholder
BeforeoonnectingtbeACpowe:rcord lotbo""ACIN
oonnectoraodtoawal.loutlet.werecommendto
:~':'1""~
0~oordsecnre!ywilhlheACplug
1 PlugtheACpowerplugintolheatlachedbolder.
'lbell. '®!ch the snpplied AC plug bolderon tbo top
oflheACpower<oid.
2 =~~=:=::~i:;_.:oruuntilit
Todisconnectthe ACpowercord
111111
WaitatleastlOseooDdsal'le,-swi1<:bingOFFlhe
powerowik:hbefuredis<unnec~nglheACpowei:cord
todiscbargeanysla!:tceleclricityfromtheCRT
displaytube.
:~_ontACplugholderby,qneezmgtbeupanddowu
1111
Illia••~:.ilTI111
"-.1111~~
~
~, 1\
~
~.
w
~
111111
Beforcoonnectiogtbevideoequipmen~sce
''lmport>udsafoguardrlnoUc<!sfru'useinth<I
mcdlealenvlrorunenls"onpage2
Connectacoa,ija[cablewilhtbeBNCCO!U!e<torslo
theBNCcomectorsontberearpanela,illustratcd.
111111
Beforeconnectioglhevidec,equipmem,see
"lmpnrlaQISllfeguar<lslnotkesforuselu1he
medkalenTiromnmls" on page2.
1 Aiigntbeplu.gandsocl'.el.Cllleiully.
2 PusbfuUyinandtighlenlhescrewshyband.
Todisconnectthe plug
L>o<e<1tbe..,,_.,andpull<><1tlbeplng.

I
0
I
Preparation -
~ ~---..:.:·-·""·""",':;".::;';::;
il~l-~1'
Hookthetab•ontheupper<dgemtnthe
ventilationhole-,makingsuretbattbearrowson
lhccoverare-fui:ingdown .
...,.~- - -----------i I -
2 "'"""' Attachlhe&plash
~ ..... --•---,~~--
l~l ~ I
TaJ,,.,11,.
-·-
--
~
~ f
2~
~.,.,,.1-
2 Pushupthetabsonthebottomedgeandfitthe
"°"""imotbclowcst""otilationholes.
Attacbcoversonboth\eflandrigbtvents.
-
lnmdertnprotectlhecol!lmlbuttonsonthefrom
panelfromioadvertelltopemtioo,auachthesuppli<d
crutlrolpaoclco-,er.
=~the~~biogestnthelenandrightgrips
2 F"rtthebosse•onbothsidesoftheconlrolpand
coverimothelowerholesonthepanelhioges.
bendingtheconlrolpw,elcol<aralittle.
□
2 1
mm
•Afterthopoworbasbeeotumedonoryouhave
pressed Ibo DEGAUSS buuoo on the front panelof
themonitor.tbemooilorisdernagneriudfor
appro;ttimalelyJ0...,,ods.Thisgcneratesaslrong
""'!lnet!clieldaroundthemonil<Jrwbkhmayaffoct
datastnrednomagnelictapeordislsnearlhe
:=:.~~~~~~:::!!(ipmcntaod
•Wheneve.-fOl/changethe!o<:ationoflbemonitnr,
degauss11te"1"ru1orbefonea<jju5tmc<ltSaremade
1 Sctlhepowerswil<:btoONandtbentun>onlho
pow<ttontheotborequipmoot.
We recommend wlll1Ilill8up the monitor for at
:;:~~::::~~~tbepowerswilclton
2 ~i;~~ii~i:::.";'~·
Whenthe POWERSAVINGIndicator le Ill
Ifno,yncs,gns!,arereceivedforacenainporiod.lhe
POWERSAVINO mdioatorlights. and the 11\0nitnr
screenblonbouLThisispowcrsavingmode.
Tunchl"l! aoy button otbotthanthe POWER owik:b
willrcsiorelhemonilortnommalop=li<>n-
.,,,.
lttakosaboutleosecondsforthepicbuetnreappcar
onlhesc,eeoal'li,:,powersavingmodeisrel""""'1.
Hthe color dlspl•Y becomeenon-unHorm
l'resslhe DEGAUSS bultno scthatlhocolor
unifonnitybocomosaseven.Ifthecolordisp!ay
becomesnon-unifOII11evenaft,rpres<inglhe
DEGAUSS bultOII, landillg a<ljU8tmentis =tuinod on
theon-scieenmenu.
F,,,-<klah,.,,,"Toadjru1th,i,,,,,/ing"rmpag,17.
Todlsplaylhewholeplctureonthemonilor
fu,. thoUNDER SCAN button ""that the signal
=~li<ann<dnulsidoofthoSClUD3ppoanlODthe
.,,,.
Wheothemooi!orisinuodencaomode, dm:RGB
scanninglinosmayappearonthompedgeofthe
sc,eeo.Tocscarccausedbyaointemal-signal.,and
arenotpartoftheillp11tsignal.
17

0-1
f
-11-

□
'
f
-12-

I
;;;
I
On-Screen Menus
Dlsplaylnglhemalnmenu
PresstboMENUbulloll.
ThemainmenuapJl"fil"-
Malnmenufunctlons
"Ibis section QP!ain.; ..,nmgswhicb you can change
usingtheoperationmeru, ..
Toselectlhecolortemperature
1bomonitorlwtwop,esetc<Jlo(IOtnpCt'lltUres.6500K
and5600Kandtwocusoomizedcolor!empe1'llllres
USER landUSER2 Youcanselectoneoftbosofuur
"""'dard temperatures on ibe COLOR TEMP SELECT
II]COLOR TEMP SELECTmenu
'
D Solsth!tcolor!empera!ureto6500K
Solsth!tcolorlem~reto561JOK.
i-!:;"'trse'it~L~T~P
Selslhecolofleln-1ureto1ho
ooe.«onUSER2COLOATEMP
AOJmero.,.
Yoocaria,;tjustlbecolortempen,tnreontheUSER
SERVICE me.nusof USER land USER2 toobl3ioa
«1\ortemperalllreolherlb&111hera.:rocy,eamg,of
65001Cand5600K.
FM,i,ta,l.,ofhow.,oblwnacolor~mn,,.osh,r/han
1Mfectcrys,11Utg,s,="foadj"'1r~,IWll~,1,ol,mce",,,.
-·~
TocontrolthemonltorvlatheFIS-232C
---~
You<;a11oo]ei:tthemOI1itruoperatioomodeouthe
REMOTE(RS.232C) me.nu.
[g)REMOTE(RS-232C)menu
EJ
..
-
~(R~OTE l5i~:~~~
,-~
(FRONTLOCK)
,~,
,o=
Cornds1hen'IOl'ilorre-yfroma
~orBu11onsan~con1roll<rnbs
:=..:~o~~~~~E
(RS.232C)lllel!U1""11thtsrnodo.
::::r..:=i.lJ/EXIT~tMfo,
C<><11rolslho"""'11t>rremolol)'fn:,ma
COOlpu\tlr.C<>nrcikoob,ffl)a,;
:~~!:~~1:r~~
Tollll!lecttheslgnaltabemonltoredltvough
the RGBICOMPONENTconnector•
Youcansclectthesigoaltobomoniroredlhroughlhe
RGBJCOMPONENI"coruiectorson IboRGB
SYSTEMmenu.
rn:JRGBSYSTEMmenu
~
□
This menu appcan;wbenyou press !heROB/
COMPONENT A buUOIIou !befmnt panel. When yall
pre••theRGBJCOMPONHNTB bunon, the RGB
SYSTEM-RGBB-n>eIUlappcats
Mon!0011hell0Bsi!lnalwlile
cperarlnglh!tmomroraoa>Idiny«.
:.:.~~.,:,~lln>ugh
!GB--SvNCON1::::::i1:::ia~::""~1o
1h!>syncsign11lfrolnGellanr>e1.
~~-EXT I::::~i~eC:.,.~og":!le
~=~~1hrolJ!t,
rMMYNCON I=i~=:i=:r:e
WbentheLINEAllfbutto11lsprused
If you selectIbo~ SYSTEM menu when LINE A
orLINEBissekctedwitl!lbeUNEA/Bbutton,the
followingmemrap~
~
ToselecttheAFCj(Automallcfrequency
Control) time colmant
iflbeslgnalinputtoµiemomtorfromaVCRis
:::;;~!::E!:=:~~u"!
sele<:tiogthcpropcr~timeconstantontheAFC
!I]AFCmenu
'
D
-Fune!lon
~!heAFClmee<>nslarit1o1
""'
~lheAFClimecomlont«.2
lftbepicuneisstill~even.ifyonchangetheAFC
settlng.anotbcrproblemcanheoonsldncd.Cbeck
yourVCR. I
Toconflrmthec~rrentmenusettlngsforthe
monitor :
You~ancoofumthe:statn•olthecol'l'Clltoettingson
eacltme1111on1beS1jA1USmenu.
[§]STATUSmenui
~·
Whe11LlNE Aor LINED isseh:ded with tho:LlNE
A/Bbntton
When the IJNE A or LINE Bis ,elec!Od,!be column
'!JvSZ,5_"'!_dSYNCmedt,playedasfollow•.
SYNC:--
To reset the monitor 11atusto thefac:tory
setting,
Yoocanresettbesettingsonallmeauototl!ofactruy
settiogsootboFACTORYPRESETmenu.
[§]FACTORY PRESETmanll
'
D
b•
CAii:EL Reset,,M..,."'9'tu! ... !OCl<>fy
;:texcoptforlh!t'tANGUAGE"'

fl i H . i J
;i '
~
I.iii Ii h ~ ~
-14-

I
;;;
I
On-Screen Menus
Dl$fllayfng 1118USER SERVICE menu
=~e~;~~=n~:!'~~~~bold
TheUSERSERVICEmenuappears
USER SERVICE menu functions
Thisoechonexplainssctlingswhicbynucanchar,ge
Wiinj:the USER SERVICEmonus.
ToadJUstthewhHebalance
'Thewbi!ebalancecanbeadj1>Stedusinglbecolor
temperaturosetting.
Yoocanadjustthecolormmpemture<>nlheUSER
SERVICE menus of USER I and USER 2 to<>btaina
colortemperawn,olber!h,.,,lbefoctcrysettingsof
6500KandS600K.
-
USER I is&etto6500KandUSER2i .. ettc5600Kin
1befactruysettinge0<b
ThefollowingexplalnsbowtocbangelheUSERl
COWR TEMP ADJ menu .. !ting.
II)USER 1COLORTEMPADJmenu
a
1s..1ectlbedesiredoolortemperaturcs(6500K,
S600Km-USER2)tobeusedasstandardwhen
adjustingtherolorlempcratllrebypre,SU,gtbet
w ♦.
COPY6500K+ Tl,eoolortem?<'l'lllff<lala<i6500K
USER1 lscopiedloUSat1.
CO?YSSOOK+ Tlleoob-~un,<lola.(iSIJOOK
USER1 isoopie<lloUSEl11.
COPYUSER2+ Theoolor1ornpemureda1aolUSER
USER1 ~-=oopiedtot/loonesetasUSER
a)Thisi,elfooti•etopreger.-elheo<ig,nal.,,,t<mp,,rotln
:r~~iisiJ~t•ll»dd"ylhovaluoba.,edontbo
2 Presstho ENIBRbtltton.
Thefollowingmenuappea,,i.
[[I COPY 6500K + USER1 menu
D
3 Movclbecll(SOI"( )l<>OOPYbypressinglhe t
orfandpre,slheEN1ERbllllO<I.
Toe message "DATA COPIED" appearswhen
""PYUJgisoompleted.
4 PresstheMENUbutton
Thestandardcoiortempe,aturemenudlsplayedin
stop!"""""""
5 Adj11Sttheblas!l!ldgainify<>11wan1tomodifylbe
c:<>piedoolortempera!UrC.
,..
GAIN Toadj,dwMebo....,.(Usaijt<>
oomper=lelorligt,looa!JSly
l~Og)
Toadjust"ihoblaelrballlno>(-lo
compensaletalowlrtensitY
hghling)
(D Movelhecursor{ )toADJUSTGAJNby
J:::'glbetorfandpm;•lheENTER
'lboADJUSTOAIN"""'nappe,,rs.
[IIADJUSTGAINmenu
D
-
@SelecttheR.GorBebaime[bypressinglhe
SELECTbutton
@AdJllstthevolumcoftheselectedehanoelby
P"'-"ingthe+or~bnUOIIS.
@PresslheEXITbutton.
'lboslaodardeolortempenuunimot1u
=:!s~CUm>ri>pooitiooedon
@ Repeatstep@and@toadjustlhebias
Theii<reett<lisJ'!ayswithlbeadjustedvalne,
btltlhedatai,nocyet,tored
!.:..n:~-:i.':..'1~•b=
:.':i:!!11.~buttononthemenu)
6 P,,:s•tbcMENlj"button.
'lboadjn,tedvafucsarestmedinmemory.
;:::v::~~~=~n!~:~~Wwing
[IDPOWERSAVl!"fGmenu
'
EJ
Reduceslhopow,ar""'10Umplionlo
iopprox.25%,30m1!U<>c-
Sffl!Slng1heabsem:ealsyr,:~
R<>dll<.8Slhepower""'1~
awrox25%.1omiootesa11..-
~"""11hl-..O.a1oync.iiina1
--~
To confirm thed ➔ l:Q Mt by !he computer In
~=~m:•~•contro!ledfromlhe
remotecomJ.111ter,sui:h8'\IOlume.contrast,clumna,
~;;;;;:~:;~~:;~~~~:
:~~=tp=•lboMIJ.MORYDATA
(!]MEMORYDAT,ii.INREMOTEmenu
[!!]
'
',
Tosefectthemenulanguages
Youcanseleetlholllellulanguageframtbefollowing
fivelanguages:Englisb,Gcnnan,Fr,meh,llalliu,and
Spaniohon theLANGUAGE"""'"-
[§)LANGUAGEmenu
L!D
Toadjustthelandlng
lflhecolori>notlllllfnnneven~fteryoopres,ithe
DEGAUSSbuUon,youeana<ljustlbelandingsoaslO
obtain eol.orunifonnily on tholANDl.NG "'"""•
(§]LANDJNG!Mnu
D
Thefollowinj:tw<>methodsareavailable!Oadjustthe
-~
Onei>!Oadjustlandlnga&lnpultinglbe&ignalwith
whicbthebonwnlal.linesaredisplayed
Theolberistoadjustlandingasinputtinglhesignai
wilbwhicbtbcwbolcser=ibo<:ome,wbitisb
Whfflinputtlngtlleslgnaltorthehorkontallloos
=:ngtbe+and-~untilthelinesbeeame
Whe11inputtlnglheslgnalwlthwbk:htbewlwle
seree:nbeoomeswhltW,
Adjustusinglhe+and-bulto!>sUlltiltbewbitecol.or
bei:omesasuniform3!1possth!e.
:::t;+-:iii°:~:..

-16-

PVM-20M7MDE
SECTION 2
DISASSEMBLY
2-1. TOP COVER AND REAR COVER REMOVAL
A"'Pt----_ G) Threescrews
<' ::: I (CASECLAWSCREW (OS))
(DThreescrews
(CASECLAWSC~ @Top cover
,---,.
®Seven nylon rivet
LJ
, . ~
Ii~
1 ~, @Fourscrews
@Rearcover ~ (+BVTP4X16)
2-2. TERMINAL BOARD REMOVAL
@Removethetermlnalboardln
the directionof arrow@.
(DRemove the two claws in
thedirectlonofarrow®.
2-3. J, H BOARDS REMOVAL
®Twoscre
@Remove the chassis
assemblylnthedirec-
tionofarrow®.
® ®Remove the lower
cabinet assembly in
thedirectionofarrow
@.
(+BVTP3 @Two screws
(+BVTT4X12)
~
CJ®~~~~12)
@Jboard (Z)Hboard
@TWoscrews
(+BVTT4X12)
-17-

>VM-20M7MDE
2-4. PICTURE TUBE REMOVAL
(J)Cblockass'y
@Twosc,ews @Pblock~a,s•y
(+BVTP4X10)~
®••:~::,:::.~-
(Tapplngscrew(5))
@Deflection
,-:•.
®Anode cap
@Twoscrews
(+BVTT4X8)
@Chasslsass'y
® ~~~~ea:~: © G blockass'y
®Picture tube
• REMOVAL OF ANODE-CAP
NOTE: Short circuit the anode of the picture tube and the anode cap to the metal chassis, CRT shield or carbon
paint on the CRT, after removing the anode.
• REMOVINGPROCEDURES
CDTurn up one side of the rubber cap In the @ Using a thumb pull up the rubber cap
directionindicatedbyarrow@. finn1yIn the directionindicatedby the
arrow@.
• HOWTOHANDLEANANODE,CAP
CDDon't hurt the surface of anode-caps with
sharpshapedmaterial!
@ Don't press the rubber hardly not to hurt
lnsldeotanode-capsl
A material fitting called as shatter-hook
tarmlna!isbuilt In Iha rubber.
@ Don'tturn the foot of rubber over hardly!
The shatter-hook terminal will stick out or
hurt the rubber.
-18-
@Whenonesideoftherubbercapis
separated from the anode button, the
anode-capcanberemovedbytumlngup
the rubber cap and pulling up it in the
directionofthearrow@.

PVM-20M7MDE
SECTION3
CIRCUIT DESCRIPTION
3-1. A (1/4) Board (page 1)
This monitorcan receive thevideo signal of both fH:: 15.625kHz
and fa= 31.25kHz. The input video signal (PAL and others) of
fu = 15.625kHz is DOUBLE SCAN-converted at the B board
whichisthesignaloffu =: 31.25kHz,anddisplayedonCRTscreen.
The signaloffH=15.625kHzisabbreviatedas.15.K,theDOUBLB
SCAN-converted 1iKsignal as .EE(Flicker Free) and the input
signal having fH=31.25kHz from the beginning as llK in this
section of circuit description,
Page 1 shows the signal processing circuit of ,UK, and the
respective sync separator circuit of ill and llK.. IC 10
(CXD2024AQ)isadigitalcombfilter operatingon the 4 fscclock
which is also used in the chroma decoder of IC13 (M51279FP).
If the signal at TP20 (VCXO) is not output at the frequency of 4
fsc,nooutputcomesoutfromICIO pin@(Y. OUT). CPl isthe
PAL UN separator. ICl 1 (MM1231XFF) switch 5 is the switch
selecting either the LINE NB signal or the ROB/COMP A/B
signal, and sends the pin@ output to the sync separator circuit
IC6 (MMl 11l~FF). The !Cl I outputl.5.K is amplified and sent
totheBboard.
3-2. A (2/4) Board (page 2)
Page 2 shows the signal processing circuit for.3.1.Kand EE, IC 1005
(MM1231XFF) SW. 6 isthe selector switch which selects either
the EE output signal from the B board or the J.lKoutput signal
from the Qboard (input/output terminal board). If the RGB mode
is selected, the selected signal is sent to IC1015 (MM1231XFF)
SW.7 directly. The component signal (including video and YIC)
is sent to the chroma volume control circuit, aperture circuit and
tothematrixcircuiL
IC1022 and IC1023 (CXA1521M) constitute the chroma volume
control circuit. The delay lines DL1001 and DL1002, and the
related transistors form the aperture circuit. The output signal of
theaperturecircuitisbufferedbyQ1036andaddedtotheYsignal
through R1116. IC1007 andICIOIO (CXA1211M) are the video
volume control which determines the matrix gain. ICI008 and
IC1009 (MC14066BF) are the clamp circuit.
The transistors QIOI6, Q1035 and Ql043 are the additive
operation transistors which convert the component signal to the
ROB matrix signal. IC1016 (CXA1739S) controls theauto white
balance, contrast, brightness and aperture. It switches the OSD
(On ScreenDisplay)cbaracters. IC1003 (MC74HC158BF) SW.9
sele.ctseitherthefEsyncorJ.!KsyncSlgnal. theselectedsyncis
sent to IC2013 (page 3). The output signal from IC1016 (R. G.
B)areinputtotheCboard.
3-3. A (3/4) Board (page 3)
Page 3 bas the control CPU and the small signal processing circuit
of the deflection system. IC2003 (control CPU) is the heart of
this monitor having the functions such as system identification,
nonvolatile RAM control, key scan, remote identification and
peripheral control. The system identification is performed by
observing the signal frequency at pin ® (2H. SYNC), and
identifies if the signal is 15K or llK. Result of identification
controls ICIOOl pin® (FF/PROO). Then thesystem is identified
by observing the signals at pin© (v. sync) and pin @(INTER/
PROO). In accordance with the result of system identification,
the appropriate data from pin@ and CLK from pin@ are sent to
the peripheral devices The peripheral devices are such devices
as the e,i;tended shift register (IC1001), the electronic volume
control (IC1002, IC1011, IC2015), the deflection signalgenerator
(IC2010), the OSD CPU (IC2014) and others.
As long as the CPU operates normally, the clock signal appears
at pin @ PIC and the positive polarity pulse of almost V rate
appears at pin @ (watch dog timer), with pin @ being set to H.
IC2005 and IC2006 are the nonvolatile RAM in which the default
and user adjustment data are stored. The RAMs communicate
with the CPUilirough UC blls.-ic2008 (CXAi4'7b-AM) gelleraies
sawtooth wave and parabola wave. IC2010 (CXA8021M)
performs addition and multiplication of the waveforms generated
by IC2008 under the control of CPU, and generates the deflection
base waveform such as pin@ (V. DEFL) signal. IC2013
(CXA1543M) is the HIV oscillator generating the HD and VD
signals which are the reference timing of the deflection system.
3-4. A (4/4) Board (page 4)
Page 4 has the horizontal pin distortion correction circuit, high
voltage control circuit. high voltage output circuit, audio circuit,
LCC (landing correction circuit coil) circuit, protector circuit and
video pre-amplifier circuit. IC3003 (CXAI544M) is the PWM
(Pulse Width Modulation) controller for horizontal pin distortion
correction and high voltage control. Q3031 is the high voltage
output transistor. IC3009 is the output amplifier for LCC circuit.
IC3030 is the +B JX)wersupply switch which is turned on and off
by the PWM controller output in order to maintain the HV (high
voltage) at a constant voltage. IC3007 is thehigh voltage protector
and the IK protector. If Q3031 (HV OUT) is broken to cause
short circuit, Q3030 and R3164 could be broken at thesame time.
-19-

f>VM-20M7MDE
3-5.B Board
The B board has the digital double scan circuit which convert
1.5Kto EE signal. By this circuit, the PAL field frequency is
made to be lOOHz so that one field signal is made to scan the
CRT two times thus removing the field flicker,
15.K.input signal to B hoard
1H •• 641,lsec
IV······ 20msec
EEOutput.Signafl'roinBboird
1H ··•··· 32µsec
lV······ IOmsec
(VIDEO) {V, SYNC)
-l'Lr JLJL
j 64µso, j I 20msoc I
Theoutput signal (EE) from the B board is compressed to tn in
timebase. JC701,IC702, IC703constitutean ND converterfor
TG!Y, B/B-Y,R/R-Ywith thesamplingclockof about14.2MHz.
IC708,IC709,IC7IOarethefield memory. IC 711is the D/A
converterwiththereadclockofabout28.4MHz.
IC?12is the flicker freecontrol CPU having the functionsof the
double scan processing ofH. sync, V. sync, frequency division of
28.4MHz clock, AID conversion, memory and D/A timing
control. IC716 selects the sync signal when no signal is input.
IC714 selects theAFC filter. and IC704 is the VCO (with output
ofabout28.5MHz). The output signalfrom the B board issupplied
through the low-pass filter of FL708, FL709 and FL710.
Insummary, the B board receives 11K from the A board page 1,
perfonnsthedoublescan(tlickerfree)processingforthesignal
and HIV sync, and outputs them to the A board page 2.
-20-