Ikegami HTM-1550R User manual

MODEL
HTM-1550R
HTM-2050R
HDTV/SDTV MULTI FORMAT
COLOR MONITOR
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SERVICE MANUAL
lkegami

/
INFORMATION TO USER FOR FCC
Warning This equipment generates, uses and can radiate radio
frequencyenergyandffnotinstalledandusedin accordancewiththeinstruction
manual,maycauseinterferencetoradiocommunications.
Ithas beentestedwitha classA computingdeviceandfoundtocomplywith
thelimitsfora ClassA computingdevicein accordancewiththespecificationsin
subpa,tJ of Pa,t 15 of FCC Rules,whichare designedto providereasonable
protection against such interference when operated in a commercial
environment.
Operationofthisequipmentina residentialareaislikelytocauseinterference
in whichcase the user at his own expensewill be requiredto take whatever
measuresmayberequiredtocorrecttheinterference
\ -

SAFETYPRECAUTTONS
1. Complywithcautionandsafetyrelatednoteslocatedontheshieldcase
inthereceiYcr.
2. WARNING
Any aJlerationshouldnot is made in the designor circuitryof this
receiver.
Anydesignaltcmlionoraddilionsmayalterthesafetycharncleristicsof
thereceiverandpotentiallycreateahazardoussituationFortheuser.
Any design alteration or additions will void the manufacturer's
v.'Rffilfll)'andwillfintherrelievethemanufuctureof responsibilityfor
personali1tjrnyorpropertydamageresullingtherefrom.
3. CRT
Thepicturetubein thisreceiveremploysintegralimplosionprotection.
Replacewithatubeofthe sametypenumberforcontinueds.'lfety.
4. X-RADIATION AND HIGH VOLTAGE LIMITS
The primarysourceof potentialX-radiationin solid-statereceiversis
thepicturetube.
111epicture tube is specially constmclcd to prohibit X-radiation
enuss10ns. For continuedX-radiationprotection,the replacement
tube mustbethesametypeas theoriginal.
1hc shields and mounting hardwear for picture tubes have an
X-mdit1lionprotectionfimctionandmustbe properlyinplace
Highvoltagemustbe checkedeach time any seiviceis requiredtl1t1t
involves13+,Horizontaldctlcciionorhighvoltage.
Whereused,X-radiationprotectioncircuitsmustbecheckedforproper
operationeachtimetheX-radiationprotectioncircuitissen1iced.
Referto the warninglabelon the shieldcasein the receiverand the
schematicin the manual and, where used, X-radiationprotection
circuitsspecifications.
Highvoltageis nminlainedwithinspecifiedlimitsby the useof close
tolerancesafetyrelatedcomponents/adjustmentsin the high voltage
circuit.Ifhighvollagcexceedsspecifiedlimits,checkeachcomponent
specifiedon the schematicdiagram and take necessru)'com.-ctivc
ac!ion.
5. PRODUCT SAFETY NOTICE
Many eleclricaland mechanicalparts are receiversets have special
safety-relateddmracteristics. There characteristicsarc often not
evidentfromvisualinspectionnorcantheprotectionaffordedbythem
necessarybe obtained by using replacementcomponentsrated for
highervoltage,wattage,etc.
Replacementpaits,whichhavethesespecialsafetycharacteristics.arc
identifiedinthismanual.
Electricalcomponentshavingsuch featuresarc identifiedby(*) on
thepartslistandtheschenmliediagraminthismanual.
The use of a substitutereplacementwhichdoes not have the same
safetycharacteristicsas lhe recommendedreplacementpait show in
thepartslistinthismanualmaycreateshock,fire.orotherhazards.
ProductSat"etyis conlinuouslyunderreviewand new instmctionsarc
issuedfium timelotime.
for thelatestinfonnationalwaysconsultthecurrentlkegami Service
Date.Asubscriptionto,onadditionalcopiesoJ:lkegami Sen.'iceData
maybeobtainedatanominalchargefromNY-lkegami.
L

I
I
CAUTION: TO REDUCE THE RISK OF ELECTRIC
SHOCK, DO NOT REMOVE COVER (OR
BACK).
£
SA1965
WARNING:
AVIS:
NO USER-SERVICEABLE PARTS IN-
SIDE, REFER SERVICING TO QUALI-
FIEDSER-VICEPERSONNEL.
The lightningflashwith arrowheadwithin a triangleis
intendedtotelltheuserthatpartsinsidetheproductarea
riskofelectricshocktopersons.
Theexclamationpointwithina triangleisintendedtotell
lhe user that importantoperatingand seJVicingin-
slruc-tionsareinthepaperswiththeequipment.
FOR ffiNTINUED SAFEfY, REP1ACE SAFEfY
CRITICAL COMPONENTS ONLY WITH MANU-
FACTURER'S RECOMMENDED PARTS (REFER
TO SERVICE LITERATURE).
POUR MAJNTENJR LE DEGRE DE SECRITE DE
L'APPAREIL NE REMPLACER LES COMPO-
SANTS DONT LE FONCTIONNEMENT EST CRI-
TIQUE POUR 1A SECURITE QUE PAR DES
PIECES REffiM-MANDEES PARLEFABRICANT
(CONSULTERLE GUIDEDE DEPANNAGE).
WARNING: TO REDUCETI-IE
RISK OF FIRE OR ELECTRIC SHOCK, DO NOT
EXPOSETHIS EQUWMENTTO RAIN ORW~R.
WARNING: BE SURE TO READ TI-IEOPERfilION MANUAL.
REFER TI-IEOPERMION MANUALABOUT PART
OF OPERfilION.
- l -

-CONTENTS-
MAINTENANCEandADJUSTMENr
I. MAINCHASSIS . .. . .................................3
(I) PURITYadjusiment. ____ 3
(2) CONVERGENCEadjustment ..............3
(3) CRTreplacement.......... ..........................4
(4) BATTERYreplacement ---············· 4
• BlockDiaw,,111 C2-905473 ...... 5
· SchemalicDiagram C2-905392 ..... 6
2.VIDEOSYSTEM .. 7
2--1MOTIIERBOARD.. .. 7
(I) Oulline ..... ....... 7
(2) Adjuslrnenlprocedure... 7
· PartsLocarion. . 8
· SchematicDiagram
· SchematicDiagram
2--2MPUBOARD .
(I} Outline
(2) Circuillkscriplion
(3)Adjustmentprocedure...
BlockDiagram
· PartsLocation
· SchematicDiagram
2--3VIDEO PROC. BOARD
(I) Oullu1e.
(2)CircuilDcscrption
(3) Adjustmentprocedure
· BlockDiagram
· PartsLocation
C2-905348 ...........9
C2-905388 . IO
II
II
II
II
12
13
Cll-905370 14
17
17
17
17
20
21
· SchematicDiagram .....................Cl 1-905387..... 22
2--4 RGB OUT BOARD . ..........25
(I) Oullu1e.... .... 25
(2)CircuitDcscrption . . .. . 2S
(3) AdjuslmenlProcedure ......25
· PartsLocalion .... 26
· SchematicDiagram .. C3-90S386........... 27
2-5 CRT SOCKET BOARD ........ .. 28
· PartsLocation ............28
· SchemalicDiagram IITM-ISSOR. C4-905417... .... 29
IITM-2050R.. C4-905403...........30
3.DEF&POWERSYSTEM.
3-1 DEFBOARD&HVOUTBOARD
(I} Oulline ...
·············31
..... 31
31
(2) CircuitDcscrplion .
(3) Adjuslmenlprocedure .
DEFBOARD
• BlockDiagram
· PartsLocation .
· Sd1ematicDiagram
HYOUTBOARD
· PartsLocation
· SchematicDiagram
3-2 POWERBOARD ........
(I) Outline
(2) CircuitDcscrption .
(3) Adjuslmentprocedure .
· BlockDiagram
· PartsLocation.......
· SchematicDiagram
...........31
.... 31
........ 20
········34
....... Cl 1-90S332........ 3S
..... 37
...........C3-90S334. . .. 38
...... 40
. 40
..........39
39
..... 39
41
....... C2-90S329. .... 42
HTM-1550R
MODEL HTM-2050R
HDTV/SDTV MULTl FORMAT
COLOR MONITOR
SERVICE MANUAL
4.CONTROLSYSTEM.
4-1FRONrPANELBOARD& OTHERS
(I} Outline...
(2) CircuitDcscrption
o HTM-1550RCONrROL & YR BOARD
. 43
........ 43
43
.................43
· BlockDiagram 44
· Partslocalion (PD87AF/PD91P2E}............45
· SchemaJicDiagram............................................C2-905342... 46
o HTM-ISSORFRONfPANELIJOARD
· PartsLocation
· SchematicDiagram.............
" IITM-lSSORFRONrLEFTBOARD
· PartsLocation
· SchematicDiagram
IITM-2050RCONIROL & YR BOARD
· PartsLocation
· SchematicDiagram
o HTM-2050RFRONf PANELBOARD
(P-70443)....
C4-904225 . .. 47 48
(PD0715}... 49
C4-90S4I8 .................50
0'D8ZNSE)
C2-905343... 51
S2
· PartsLocation ..................................... (P-70429) .......... 53
· SchematicDiagram . ..................C4-90S22S ...... 54
,, HTM-2050RFRONfLEFTIJOARD
· PansLocalion ...........(PD8ZM2E) ... 55
56
· SchematicDiagram
,, LEDBOARD
PartsLocation
SchernaticDiagram...
SchemaiicDiagram...
C4-905339 ..
(PD0407}.
C4-905470 .
C4-905471
57
... ·58
.... 59
5.Pans List 60
5-1 TerminalConnectionDiagramand
EquivalentCircuitorSemiconductors.. ...............60
5-2 Electricalcomponents. ........67
(I) How1orcadtl1epartslist. ... 67
(2) ManufactureISCord. 68
m-~ ·~·~~·w
S-3 MechanicalPans L~f/ExplodedView... ..116
HTM-1550RBODY KJ-908145.........117
HTM-lSSORFRONfR!GHTPANEL .
HTM-1550RFRONTLHT PANEL ...........
HTM-2050R1lODY
HTM-2050RFRONf PANEL .
HTM-2050RFRONf LEFTPANEL ....
IITM-1550RVIDEOUNIT ..................
IITM-2050RVIDEOUNIT .....
KJ-908146.........119
K4-908147.........120
KJ-908131.... ..121
K3-908132 ..123
K4-908133.........124
K4-908149........12S
K4-908134.........126
HTM-1550R/2050RMPUBOARD .... K4-908l0l ...127
HTM-1550R/2050RVIDEOPROCESSBOARD ..... K4-908I02 ........ 128
IITM-1550R/2050RRGBOUfBOARD.... K4-908098... ..129
HTM-1550R/2050RDEF1lOARD ..... K4-908096.........130
HTM-1550R/2050RHYBOARD ....... K4-908113.........131
HTM-1550R/2050RPOWERBOARD
DCH-501DUALCOMPONENfMODULE .
DKH-501HD-SDIDIGITALIINPUTMODULE
DKH-502HIMDIDIGITAL2INPUTMODUIE.
K4-908095. ...132
K4-908150....... 133
K4-908099.........134
K4-908100.........13S
DK-801421 DIGITALCOMPONENTMODUIE...... K4-908J03........ 136
D~l NISC3UNE<XlMBDECODERMODUIE K4-908104.........137
-2-

1.MAINCHASSIS
(1) PURITYadjustment
Thepurityisadjustedlooptimumatshipment.
Normally,noadjustmentsarerequired.
HoweverperformadjustmenlSifnecessary.
'
Deflectionyoke ___J
---Appcooed-1pola.rStatic
ConvergenceMagncls
LockRing
~ 6pobrStalic
~ ConvergeoceMagnels
- PurilyMagnels
HIM-1550R
Defiedionyoke
FLxing&mv
-lpobr
~ Conve~nce Magnels
6JXJlar
1•---ConvergeoceMagncts
~ LockRmg
\__
PurityMagnels
... f------ DefJedionYoke
HIM-2050R
(j) Seled lheflatfieldusingthef!ji,§j switch.
@ Demagnetizetheshadowmaskusingthe!DEGAUs.<jswitch.
® Setthescreentolhegreen-onlyrasterusinglheSCREENSswitch.
@-Adjustthetwopuritymagnetsa1temately,sothatlberearegreenver-
ticallineatthecenterofthescreen.
@ Whilewatchingthe screen,s]idelhe deflectionyoke forwardso
thatthescreenis anevengreencolor.
® Repeatforred-0nlyandblue-only.
({) AdjustlhepuritytooptimumusingROTATION.
-3-
Fordetailson adjustmentprocedure,referto5-5-(6)of theOPERATION
MANUAL
(2) CONVERGENCEadjustment
Priorloadjustingconvergence,performwarmingupformorethan
30minutes. Se1edthecrosshatchusingtheTESTswitch.
(j) Loosenlhelockring.
@ Settotheredandbluescreensusinglhe~CREEN~switch.
@ Obseivethecros.5edpartalthecenterofI.hescreen.
AdjustI.heang]eoflhe two4-polarmagnetsasshownin thefigure
belowtoadjustdeviationoftheredandbluevertica1lines.
@ WhilekeepingI.heang]eat ®,rolaleI.hetwomagnetstogetherand
adjustlhedeviationofthehorizonta1lines.
Roo
------0····-•
•····--0-.
Blue
@ Setall~CREEN$switches toOFFtosetlhewhitescreen.
® Adjusllheangleof thetwo6-polarmagnetstoadjustthedeviation
oflhe redandb1ueverticallines,andgreenverticallines.
(V Whilekeepinglheangleal ®•rotalethetwomagnetstogetherand
adjuslthedeviationofthehorizontallines.
@ Tighlenthelockringaftercompletingofthecenterconvergence.

(3)CIITreplacement
TheoriginalreplaceableCRThasafixeddeflectionyoke.
Thisisnoneedtoreadjustthepurityandconvergence.
(a) For HTM-lSSOR
CDRemovelhefourscrewsfixingthetopcover,andremovethecover.
®Removetheeightscrewsfixingtherightcoverandleftcover,and
removethesecovers.
®RemovetheanodecapoftheCRT.
@Remove theCRTSOCKEf BOARDfromtheCRT.
®Remove !he defleclion yoke connector (CN901) on lhe
DEFBOARD.
@Pull oulthefrontpanelon thefrontrightside,disconnecttheconnec-
lorandlakeitout
(I) Disconnect the conneclor between FRONT IBFT PANEL and
DEFBOARD.
®Removethefourscrewsfixingtheescutcheon,andremovethefour
screwsontheinsidesontheleftsideandrightside.
RemovetheCRTlogetherwiththeescutcheon.
Makesurethattheneckof the CRTdoesnot touchthemainunitat
thistime.
@Place asoftclothbelowtheescutcheontopreventitfromscratches.
PlacetheCRTonastablesurfacewiththeescutcheondown.
®Assemble in the reverse procedureof the above from ® back-
wardslo <D.
(b) For HTM-2050R
Q) Removelhefourscrewsfixingthelopcover,andremovethecover.
® Removethedght screwsfixingtherightcoverandJeftcover,and
removethesecovers.
@ Removetheanodecapof theCRT.
@ RemovetheCRTSOCKEf BOARDfromtheCRT.
®Remove lhe deflection yoke connector (CN901) on lhe
DEFBOARD.
® Disconnecttheconnedorallhelopoflhe CRT(connededlothe
IBDBOARD).
(I) DisconnecttheconnectorbetweenFRONTIBFT PANELand
DEFBOARD,andremoveFRONTPANEL
® Remove the four screws fixing the esailcheon, and remove the
CRTtogetherwiththeescutcheon.
Makesurethal theneckof theCRTdoesnollouchthemainuniIal
thistime.
® PJaceasoflclothbe]owtheesculcheontopreventitfiomscratches.
PJacetheCRTon astab]esurfacewiththeescutcheondown.
@)Assemble in the rever.;eprocedureof the above from ® back-
wardsto <D.
-4-
(c) Re-adjustmentafterreplacingtheCRT
CDAdjustinglhecenlerofthescreen
Referlo5-5(7)of theOPERATIONMANUAL
@ Adjuslinglhesizeof thescreen
Referlo5-5(9)of theOPERATIONMANUAL
® Adjustingthefocus
Refer105-5(5)of theOPERATIONMANUAL
@ Adjuslingthewhilebalance
Referlo5-5(3)of theOPERATIONMANUAL
® Adjustingthedeflectionlinearily
Referto3-1(3)of theSERVICEMANUAL
@ Adjustingthetrapezoiddislortionandsidepin
Refer105-5(8)oftheOPERATIONMANUAL
(I) Adjustingthescreen
Referlo3-1(3)oftheSERVICEMANUAL
(4)BATfERYreplacement
Beforerepfacingthebattery.noledownthepresetdala.
(Wrilethemdownat"Memo"on thelastpageof theOPERATION
MANUAL.)
(D SeltheWOWERjswitch10ON,waitforrometime,and!<IftloOFF.
(Thischargesthebackupcapacilor.)
® RemovetheMPU BOARDfrom the1eftmostsloton therear,and
rep1acelhebattery.
Th.issettingishe1ditexchangeis ablelocomplelewithinabout
fourminutesafterit!urnsOFFthejPoWERj switch.
@ InsertlheMPUBOARDbackinloils slol.
Set the tpO\VERjswitch to ON, and check that the screen is
normal.
CAUTION
Dangerofexplosionifbatteryisincorrecilyreplaced.
Replaceonly wilh the same or equiva1enltype recommendedby
manufacture.
Disposeofusedbatteriesaccordinglothemanufactme'sinstructions.

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MAIN CHASSIS
Block Diagram
C2-905473
A
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8
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F
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G
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2-1 MOTHERBOARD
(1) Outline
Titlsboardfunctionasinterfacefursignalandcontrollinebetween
variouslxiards.
(2) Adjustmentprocedure
Unlessspecifie<I,liteinputsignalshouldbe liteHDlV colorbar
(100%)/SDTV oolorbar(75%).
(a) VRl: +12VADJ
CDAdjustliteDCvoltageatTPl to+12±0.01V.
(b) VR2: +SVADJ
CDAdjustliteDCvoltageatTP2to +5±0.01V.
(c) VR3:-12VADJ
Q) AdjustliteDCvoltageatTP3 10-12±0.0lV.
(d) VR4: +12V(D)ADJ
Q) AdjustliteDCvoltageatTP5to+12±0.01V.
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2-2 MPU BOARD
(1)Outline
lb.is boardperformsallcontrolsof themonitorbytheMPUandDC
control Italsogeneralesvariouslestsignalsandmarkersignals.
(2)Circuitdescription
(a) MPU
The JCSMPU QJD6303YF)is a 8-bitCMOS microprocessorin-
corporalinga CPU,timer,RAM(256bytes),SCI(serialcommuni-
cationinlerface).andI/Oona singlechip.
The MPU operalesby the program memorized in the external
EPROMIC7 (64 k bytes). Each datais memorizedin the static
RAM!Cll (32k bytes).
Evenwhen tliepower is turnedOFF,thisRAM preservesdalaby
lhelithiumbattery(BT!).
(b) 1/0
The 1/0 control between lhe modules MPU, FRONT PANEL,
CONlROL is pedonned by latchingthedalabuswiththeaddress
decoder(ICl3, IC15,IC16,IC17,andIC97).
(c) RAM backup circuit
"The32 k bytesstaticRAM (]Cll) memorizing ;;;c-
all digilalcontroldala shouldpreservedatafur C2 7
about10yearsusinglhelithiumbattery(811).
ICJ2 deledslhevoltageof lhebatteryused,and
cfuplaysamessageonlhesaeenwhenlhevoltagefallsbelow24V.
(d) Display generator and marker color control
Thecharaclergenerator(IC25)operatingbytheHDandVDis con-
trolledby thedatafromtheCPU,andoutputscharaclersignalsand
backgroundsignalsofR,(\ andB.
The markerlevelis controlledaccordingto theDC 1evelof VR1.
The analogswitch(IC29)is used to switchbetweenlhecharader
signalandmarkerJevel.
(e) DIA, S/H circuits
Thelow8-bitandupper8-bildalaaresenllotheRAMintwoparts.
The 16-bildalaJalched(IC36,IC37)is inputlo the DIA converter
(IC38).
The data is sent continuously,and the analogmulti-plexer(IC41,
IC42)workasacircuillodividethedata.
Dycapacitors(C83to 92) forthisIC andholdlhesampleandhold
circuitarebeingcomposed.
(t) TEST, marker signal generator circuit
IC64and IC65areICs forPill. IC64operatesas a circuitgener-
ating lest signa1s,free-runHD and VD signa1sfrom lhe crystal
(27.MHzXl)clock. IC65operatesas a circuitgeneratingHD sig-
nalslobeprovidedlolhePIL(IC56).
And also controlslhe ROM (IC74,IC75) storinglhe dala of the
TESTsignaJandmarkersignal
The EPROMIC75 memorizesdataon lhepatternof one line (64
bytes)in eachack:lre$. Theacklft8irontrolmemoriz.eslhememoad-
dressdata(verticaldata).
For the markersignalsand some test signals(CROSSHATCH,
CHARACTER),lhedata(8bils)outputfromIC75is serial-parallel
convetledbyIC76.
Othertestsignalsareana1og-o:mvertedbyIC78.
- 11 -
(3)Adjustmentprocedure
(a) EL2: Elbit
SI: Dipswitch
The initialsettingof the typedifferentpeculiar(lagrelationof the
monitor.
Q) ThepositionofEU issetasfollowsforeachtypeofmonitor.
HTM:H1M1550R/2050R
CS: H1M1550CS
8090: 80f)()SIRIFS
® ThepositionofSI issetasfollowsforeachtypeofmonitor.
PH-H: JPNphosphor=ON(80f)()seriesonly)
EDUphosphor=OFF
PH-C: Cphosphor=ON(80f)()seriesonly)
EDUphosphor=OFF
CONV: ToactivateSOOJC CONV=ON
TYPE-I: TYPE-I(720Pcompatible)=ON
FT: Adjustmentmode= ON(Settingatshipment:OFF)
(b) VRl: MK LVL
VR6:1EST-SLVL
VR7:DALVL
Q) VRI isusedtoadjustthecontrastJevelofthemarker.
Normallysci tothecenter.
@ SetMARKERLoOFF,andinternal"JESTsignalstoON,andseled
lheCROSSHATCHsignal.
AdjustVR6soIha!lhe!evelofTP24becomes1.0±0.01Vp-p.
@ SelectlheWINDOWsignal.
AdjustVR7sothatlhelevelofTP24becomes1.28±0.01Vp-p.
(c) VR2:4: 3U-CONT
VR3: 16:9N-CONT
VR4: 16:9U-CONT
(D Inputlhe SDlV WINDOW(100%)signal,and adjustlhepreset
CONTRASTlevelon lhedrawerso thatlhe4:3 NOR-SCANbe-
comes120cd/m2•
@ AdjustVR2 so thatlhe4:3UNDER-SCANbecomes120cd/m
2•
@ AdjustVR3sothatthe16:9NOR-SCANbecomes120cd/m2•
@ AdjustVR4so Iha!lhe16:9UNDER-SCANbecomes120cd/m
2•
* ForHTM-2050Rl,adjustalltheabovevaluesto100cd/m
2•
(d) L7
Adjustthescreendisplayrangeofthechruacter.
(D SettheMENUscreentoSTATIJSandlhensetSHADOW.
AdjustL7sothatlhecharadersdisplayedarenotintheshadow.
* ForHTM-1550RlandHTM-2050Rl,adjustinlhe720Pmode.
(e) YRS: WIND LV
Adjuslerforthe80/90series.Noadjustmentis-required.

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Diagram
3-905380
Block
C •

TP23
VR6 (TEST-$ LVL)
...
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TP15
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MPU BOARD
Parts Location 80/90 Series 0011 VOLl (J) (U) (E)
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