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A-5181


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1
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         m
         :
         N
          olgy & Abbrviations
                                Trminology & Abbrviations
AC-3 Th formrnamf th Dolby Digitalaudio-oding               systm. A-3 followdAC-l and
          ^-2, Still usdin somstandards     doumnts.
Angl In DVD.vido, a spifiviw of a sn'usuallyrordd                    from a rtainamra
          angl.Diffrnt     anglsan b hosn      whil viwingth Sn.
D         Shortfor ompat     dis' an optialdis stoag    formatdvlopd Philipsnd Sony.
                                                                        by
CD-DA ompat dis digital audio. Th original musi D format, storing audio
          information digital PC data.Dfind by th Rd Book standard.
                      as
CD+G Compatdis plus graphis. variation CD whih mbdsgraphial
                                       A          of                             datain with
          th audio data, allowing vid     pitursto b displaydpriodiallas musi is
          playd. PrimariIyusdfor karaok.
D-R An tnsion th D formatallowingdatato b rordd
                        of                                          on on a dis by using
          dy.sublimation   thnology.   Dfindby thorangBook standard.
Channl      A part of an audio trak. Typially thr is on hannI alloatd for ah
          loudspakr.
Chaptr In DVD-Vido, a divisionof a titl.Thniall            alld apartof titl (P)'
Closdaption Txt aptionsfor vido whih ar not norrnallyvisibl,as oposd opn              to
         aptions,whih ar a prmannt        afi  of th pitur.[n th Unitd Stats. offiial
                                                                                  th
         NTSC losd aptin standard         rquirs   that all Vs largrthan l3 inhsinlud
         iruitryto dodand display aptioninformatin            stodon lin 21 of th vido
         signal.DVD-Vido an provid losd aptindata,but th subpitur                  format is
         prfrrd its vrsati[ity.
                   for
Componnt     Vido A vido sstmontaining          thrsparat     olor omponnt    signals'ithr
         redlgreenlblu   (RGB) or hroma/olor    diffrn(YGbCr, YPbPr, YUV), in analog
         or digital form. Th MPG-2 noding systm usd by DVD is basd on
         olor-diffrnc       comonntdigital vido. Vry fw tlvisionshav olponnt
         vidoirlputs.
CompositVido An analog vido signal in whih th lunr and hroma omponnts                     ar
         ombind     (by frquny     multipling),  longwith syn and burst.  Also alldVBs.
         ost tlvisionsand VCRs hav omposit              vido onntors,     whih ar usually
         coloredyllow.
L'I)-i om1rt     dis intzt.tiv' tnsitln
                                   All           {'th I] ['nlt    dsignl    arunl s{:ttl
                                                                                    a
                              ,l.V
llutl.tht      Onnrts    til       i prvit{ itltr.irtiv ntt1itllltt-
                                                        hm                  inr.Irldingdigitl
r:lil  lttllvitltl. vi! gatls"     tli stlr'.r    ;rliatins.  DfirliLl tlr (lrrr $.JIt
stndird. Assn.
           {]D-i




                                           l-l
          logy & Abbrviations
Dlby Digital A prptualoding systmfor audio,dvlopdby Dolby Laboratoris                                and
         aptdas an intmationalstandard.               Dolby    Digital is th most ommon mansof
         nodingaudio for DVD.Vido and is th mandatory                   audio omprssionsystmfor
          525l60Q..ITSC)   diss.
Dolby Surround Th standardfo matrix noding surround-sound                          hannls in a stro
         signal by applying a st of dfind mathmatial               funtionswhn ombining ntr
         and surroundhannlswith lft and right hannls.               Th ntrand surrund          hannls
         an thnb xtratd a dodrsuhas a Dolby Pro Logi iruit whih applis
                                   by
        th invrs of th mathmatialfuntions. A Dolby Surround dodr xtrats
         surround  hannls,     whil a Dolby Pro Logi dodrusstiall indpndnt th                     of
         rording transmission
                    or                 format ptllDolby Digital and MPG audio omprssion
         systms ompatibl
                  ar                with Dolby Surround       audio.
DTS     Digital ThatrSound. A prptual              audio-odingsystmdvlopdfor thatrs.                   A
         omptitor Dolby Digital and an optionalaudiotrak formatfor DVD-Vido.
                      to
DVCD Standsfor Doubl Vido D .- prttpopularformatin mainlandChina.
Formatitslf is nothingnw rall,its just a rgulardoCD ovrburnd inlud90 to                 to
99minspr D, ompard rgular74mins
                             to                   pr CD in standard      VidoCD format.
DvD      An aronymthat offiially standsfor nothing,but is oftnxpanddas Digital Vido
         Dis or Digital Vrsatil       Dis. Th audio/yjflo/data        storag    systmbasdon 12-and
         8-moptialdiss.
DVD.lt i]Vl]+Rrlbl               iltin*s stattdetrr1rrdabl
                                                      {ir              DVI] divsntrdlnli        rlr:{rrll
b th DVl}R'W llill" t}tin all,i                ''pit"ts tlr rmatis rvitOtt(tlrnd
                                                       Il''.                                          t*
DVl)lti.W !vih      gitt'} *;lsj r.lvritlrl)."l.h siir{
                         l           nd                     singl         dissrllld.i"7CICI,0{}CI,Oi}ii
lyts  (4.38{iigLr3,tsl024 L:1't*s thkilIr-vt) iilttbl
                         l               tri                 rvith         sidrj  liss  hldirlgltiltl
       -l.h                                                            -l.lris
rntlh,        *r *(}drr!l;r*        sirlglsirlcdri.lbl          diss.        i't*t   rnt*s     i,vithtI
D\,,Dirur"n D-R sti tiatir.r.
              DV                        Dv|)Rhcl D\rDR infbrrratill
JPG Joint Photographixprts Group. h intrnational                         ommittwhih ratdits
         namsak      standard omprssing
                              for                 still imags.
Karaok Litrally mpty orhstra.Th soial snsation from Japan whr suffiintly
         inbriatd    poplmbarrass         thmslvs publi by singingalongto a musitrak.
                                                         in
         Kraokwas larglyrsponsibl th surssof lasrdis Japan,
                                              for                              in        thussupporting
         it lswhr.
Krlrk  itu      l) Ktldl<     l}itu is  {.I)tht*rrittits itLlrs .}Ll.{}
                                        I)                          1''tt           irr
       jg)
rrat{ ir|lrg stirvirt. ltsYtlt,t
                    rvith            tht           vi*lv"nhtl.       sh. irt ni         Llrpiturs
t-rm ilLltr'
     vu                Stnstitlt!ln        D\iD lns          surts {brrat br'tt
                                                                     tlris         lsi. thnnl'
             .l.his                                                             ''J:'(] vilving',
fr virvirrg'               rvili
                   t'rrat als.l       vilrl.;. DVD ls
                                             n                   thtsupl-ts             tii
ilittu mn5,  lssnlli1ak            it si{i t-}            1.tus.   Kdli ir:trr      {[i.
Marovision An antitaping         prossthat modifisa signal so that it appars               unhangd    on
         mosttlvisions is distotd unwathabl
                           but               and                  whnplaydbak from a vidotap
         rording'    Marovisiontaksadvantag haratristis AGC iruitsand burst
                                                        of                   of
         dodr     iruitsin VRs to intrfr           with thrording        pross.




                                              t-2
                 &.Abbrvitions
]\4I'}3
      ]l{l'-]is n ?rrnnr     tbr.N4(i.l { N4.:) L j irtrli        tlding{it is nt n
ronym fr I}C). h4j is a pr"rlr             Orr}rssin     rnl*rt usrl 1r'audi fils rl
ol]Lltrs pr1al:rl is.
           an{           trv
h omprssion MP3 workson th basisof a ''psyhoaousti
                   in                                        modl''whih mans     that
partsof th audiothathumanarsannotdttar disardd th nodr.   by           Althoughthis is
a LOSSY   pross' an yild vry high qualityaudiofils arrlativly
                     it                                            high omprssin
rats.
A typialMP3 fil nodd 128kbit/s(l2:l omrssion) narCD quality.
                             at                          is
MP3 audiois inrasingly     bingusdin vidoprodution     oupldwith variousMPG.4
vidoods       lik div. Th audiomay b nodd       with a constant variablbitrat.
                                                              or
Multiangl A DvD-Vido program                 multiplanglsallowingdiffrnt
                                     ontaining                              viws of a
         sn sltdto        duringplaybak.
ultilanguag A DVD-vido programontainingsoundtraks and subtitltraks for mor
         thanon languag.
RGB      Vido informationin th form of rd, grn, and blu tristimulusvalus. Th
         ombinationof thrvalus rprsnting intnsityof ah of th throlors an
                                               th
         rprsnt ntirrangof visibl light.
                    th
S/l{     Signal-to-nois  ratio.Also alldSNR.
sA]D Surr Arrdil {-tD is tlr l]*Xt grtitln{' ulitr dis. *{.{ing             lilli.rang"
Ltnlntjssd digitai nrrtlti-hnnl                  srtlld.sD tli.ttt
                                      srtl.tulttlti              ls* lr lr;.rklvartl
                                                                                  iltl-tt.ilri*
using s l[dlrbi{    liss   ivit-l tri] lr'that,
                                 .ill                 llrvs t,lrm t b 1ai tli}tt,tltiitlill
                                                                             trn
D las hut 1hrlnl'v r,i,itlt    rtiit-ti:t. qurrlit}'.
                                           {:lJ         SA]D an ir ljn SAl) [,liirs.
DVD l}lsrvith sAD sllt r-OHz                                            T

                                                              125t12                                            I



o
                                                              lKHz                                              t

                                                              10KHz                                             I


                                                              1SKHz
                                                               l0KHz                                            t

          \udio SNR (dB) (A)                                                                                    >90
I
          \udio distortionand noise (dB) (1Kl-lz)                                                              <-65

5         ) y n a m i  R a n g e ( d  ) ( 1K H z )                                                              >80

6         )ross.Sound base wv (dB)                                                                              >80

7         1KHz hannl Balane (dB)                                                                                <1

o         ntermoduIation
                       Distotion(dB)                                                                           <-50

I         :requenyerror (dB)
                                                                               0
                                                                              -10

'10   -
      
      =                                                                       -40                               |
                                   Level non-linear(dB)
      .                                                                      -60
      m
      >
't1                out |evel ( (V-p)l]
             Digita|                                                                                          0.5r0.05

                                                                              12i                 -4.53 1
                                      De-bass funtion(dB)
12                                       ldis 784:-                          r 1 3r               -9.04 1

                                                                                                                    AmplitudRspons
                                                                                          OdB lKHz
                                                                             Ds
                                                                                                                    !ln A r   n^ a   ^ .rn,.

                                                                                      ^ lrtnlrt       a \.l
                                                                                                                        lv]    (dB)
                                                                                                                       t,2AHz-2AKHz)

                                                                                                                      Rfrn Lvl
                                                                                                                    Amplitud Rspons
                                                                         DoLY         RfrenLeveI                     +0.5/-1.0 (dB)
                                                                                                                      |2z-2KF,z)

13          Ds Test                                         DoLBYest          FL

                                                                             FR



                                                                              SL

                                                                             SR

                                                                             SW
14                    (iput
               Intensity l KHz 2Omvp-p)
          )utput                                                                                                  V
                                                                                                            2.5r0.5
15                and Nojs (%)
          )istotion                                                                                            <0.5


16
      s                        Frequeny Response (dB)
                                                                         12Hz                                   *3

                                                                             5KHz                               r3

17        ;rqueny
                or (dB)                                                                                         >45

18        ihortRad im (S)                                                                                       <5

'19       ong Rad Time (Se)                                                                                     <10
      J



                                                                                                                '15
20        lax Powr onsumption               (W)




                                                                       4-l
                                        Stadards


No                                                   Tst itm                                                                                 Rquirmnt


                                     Vido outputLvl                                                          C\BS otpu1                              1.!o'2
21                                      V- (V)
                                                                                                      Lin SynmpIitud                                0.3r0.05

                                                                                                                                      VD              >250
                                                                                                AV outut                             sVD              2350

                                                                                                                                      DVD              2450
                                  Hrizontal Dt.initlon (Tv )
                                                                                                                                      VD              >250
                                                                                           q   rri   da -        ^ rrf   ^ 'rf
                                                                                                                                     sVD              >350

                                                                                                                                      DVD             >500
          ^\/Qq


          FT                 Luminan hannl bndwidth                                                                 VD                          > 3 . 5 l - 2 0 d ]
                                                                                                                                                        ]
zc        UR               !n d       mn l     i tr r d      D Ae n .n q
                                                                                                                   sVD                          >3.5[-20d8
                                                (I'1Z)
                                                                                                                    DVD                         > 5 . 5 i- 6 d B
                                                                                                                    VCD                         >3,5.2dB
                        hrma hannl bndwidth
24                .nd .mp] i.ud l . r,J6                                            l'1z
                                                                                                                   sVD                          :3'5- -24d ]
                                                                                                                     DVD                         >1.5l 6dL
                                                                                                                                                       -
z                 ,uminan              n o n - l i n e a rd i s t o r t i o n ? )
                                                                             (                                                                          :5
zo                 uminan Wve distortion ( ? )                                                                                                         <10
27                . u m i n a n  S N R ( d B )                                                                                                   250 I .!L
zo                ]hrom SNR (d )                                                                                                              AML]>60P >50
29                -uminan/Chroma signal dly (ns )                                                                                                       100
30                        p]usDG (z
                  )iffrnlrl                                                                                                                             <5
J I               ) i t l  r  n t i r |P h  s  D P    (")                                                                                               i5
                                                                                                                 Y haneI                            700+140
                   _vldeo          signa1 am1itude                                  V-
z                                                                                                                                    Chma           8 8 0 r 17 6
                                       lod  (mv)                                                 C hanneI                            hroma
      s                                                                                                                              Svn
                                                                                                                                                    300r60
      m                                                                                                                                         >5'5]-6dl
      o              S-video signal bandu,idth                               nd                             Y Chnn].
JJ

      m
                     rliLude      rson..                                     l,1]rZ
                                                                                                                                                > 15 : . 6 d 
                                                                                                                   hann]                          '
                                                                                                            Y hann]                              >501
                                                                                                                                                    1
34    m              S-vid signl                                  sNR        ( Db )
                                                                                                                   Chann]                              >50

                                                                                                            Y hann1                                 700+140
                     YUV ou.U. signr1 .,:LJd)
35                                                                                                          I'l hann1                               7 0 0 r 14 0
                            V_ 1od (m\i)
                                                                                                            V haneL                                 700t140
                                                                                                            Y hnnel                             >5.5 -6d.'
                    YUv outut s1g]. bndwidtr
JO
                    nd nJ i j tUd '.cl s
                                         ,4lzl                                                              l] hann1                             >2t-6dB

          YU,V                                                                                              V hnne1                              >2 6dB..
           A.
          URE                                                                                               Y Chnne1                                 >501 ].]t
                                                                                                                                                             i
                  YUV output                 signal                                 SNR
                                                ( D b)                                                      Ll.hannrl                         >50

                                                                                                            v I.Lann1                                  >50

                                                                                                            R hanne]                                7001140
                     D:       ..]t.,,.         .:nn1              .     l'.Ldd'.
38                                                                                                          G     Chnne]'                           700r'140
                                     _p          1d (m\.)
                                                                                                                  Chnn1                             700a140
                                                                                                            R hann1                             >5 5l -6dl
                   RG outut     s1gn1     bndwidth
39
                   nd jJ i j l ]d. resl , s   l'1}.]/
                                                                                                            G hnne1                             >55l -6dBa

                                                                                                             nnne]                              >5,5-6d-
                                                                                                            R hnn1                                    >50

                   RGBoutut s1gnl                                               s}']R                       rj    Chann          l
                              ( D b)
40                                                                                                           hnnl                                     >50
                                                                                                            Y hnnl                                    >50


                                                                                                +-/
r&ge             o1andBlok Diagrms




           1

           2

       a
       J




  l.           AV abl            6. ownr'sManualbag
  2.           Battris           7. ownr'sManual
  ,            Rmot ontrol        8. PS
  4,           sart abl          9. Powrord
  5.           Sart abl bo        10.olorbox




                               5-1
            atin           f Symptoms

                Common phnmrnon lassifiation


                 VFD no display



     Chk owr lin onnt
                                            onntasain.Normal?
     PoWR?hk swith ?




     Chk    signal wir   onnt to
                                            Contagain'NormaI?
     dodr board orrt?




                 KB boardOK?
                                           To dodrboard servi Dl




            To KB board srvi Kl


2.
               TV no voi




                                                 onnt DVD lft/risht
       Chk audio wir btwn
                                                 hannlto TV orrtly
       DVD playr and TV




         Chk        Sart       Wlr
         onntionto TV



                                               Stup audi by rfringto manual
           DVD audistuprrt?




       To dodr
             boardsviD2\D3-l\D3.3



                                     1-1
                ationof Symptoms
        Clasi;ifi


                TV no displa




      Vid wir onntion orrt?
                                                      J       onnt to TV orrtl

                  Y
                          \7 N                                 Connt again' TV displa
     SCART wi r onne
                   tion orrt?                                  normal?
                                             |
                                                                                         l\



                  Y

     Prss   ..v'mod'' ky          of    th       N

     Ro..                                                         tims.
                                                               Prss   normal?
                                                          l

                 Y



     To dodr
           boardsrviD\D3-2\D3-3




4.
               Cannot opn tra



                                                 Y
            Loadr too low,&righ?                                  Adjust loadr

                      N

      Chk     Loadr         signal     wir            N
                                                                  nnet oin       nml)
      onntsto bard orrt?

                      Y                                                                       N

      hk     flat ribbo          onnt to
      ddr/srvoboar                                                Connt again, normal?

                                                                                              N
                      Y


                                                 a1
     Classifiation Symptoms
                 of



          Do not rad dis



        Dis srathd/dirty?




hk Loadr wir onnt to
dodr board orrt                             Connt again, normal?




 Chk    flat ribbon onnt to
 dd board orrt                              onnt again, nomal?




        To dodr boad srvi




 Pss..opn/Clos'' front panl,th
               on
                                                 o KB bodsrviK3
 data lin of KB board has wav out?




 Prss ..opn,/Clos'' rmot
                 on                              o KB boardsrviK2
 th IR lin of KB board has wav out?




                                      .7.
 GnralClaisifiation of Svmotoms
6.

               Imas/voidistortion




                Dis sathd/dirty?




                To dodr
                      boardsrviD4. D5




'7.

                  optial/Coaialoutputabnormal



                Audio stunorrt?                   Adjust aording
                                                  manual instrution



      Chk   optial/oaial onntion to               Adjust arding
      ddr dvi oK?                                 manual instrution




                  To dodr board srvi D6




8.


                 Rad dis and halt




              Dis srathdldirt?                  Rpla/landis




                o srvo board srvi




                                    '7-4
;.,.6 .'6f*lglfi;utii
                 f Symptoms

g.




10.                                               To KB bardsrviK3




li.




12.




       Judgmnt standard fr loader damag
      Whn blow phnomnonist,th loadr may b damagd.
       l . no s pin
       2. no lasr
       3. annot oprr/lose
                        tra normally
       4, main axis turning, but no pikup fous or gliding
       5. annotrad diss
     Whn abov phenomnonists,plastry rplaing loadr to solv th
     problm.
                       PrNrt. L71,L-P267-2
                                       t
                                       ,p         .   ,1   2+u
                                       :fl                 ::::]
                                                             2
                                       '                           
                                                           B
  -
  a"!                                                      L
  (A                                       -E-   L+
  o
  l-{




                         Dt0


                                 UA-A#
  O
                         {::l}



                                 9
               ftr Dtl   }
               tr-
:::,::ia:
|:||||:::|||
                 r       f,:}
                llzr     
 l..
                o.       l-
                    1 2 {
                                  N5    pLz 
'Mil,!itt',,,i,r|Xii!i'ttitilii=='
Main point wavforms and shmati diagamsof ltroni omponnts
8-1 Rfrnwavform ofky tst point ofpowr boad




TP1+l2V(nodis)
             3-mVpp                           TP1 (rading
                                                        dis)250mVpp




 TP2+5v (no dis)3-mVpp                        P2+5v (rading
                                                          dis)4OmVpp




P (idl)
      20Vpp                                TP3 (no dis)20Vpp




TP3 (rading
          dis)20Vpp




                                    8-3
                                ..:l
                              .:i:


                               I{ir tll' rv f} tl
         Prryr src,ilh
                     u,orkitlgrilrils
            .l.inSvr.itlr-lI(1'NY?(l7}                         .]
                                    tnitaitlsth sirrrliitr'l{.
                                                             th irlvSwithtrltrlg1,,
                                                                                r'lhil
         prr.iling tlunlbrtltl,htlnrnts
                                              tl,l.!thr
                                                      cdus},s,tcl]] nt,t
                                                                ilsi    ol}10lllll
                                                                                (}Ul}t,
         a n d t  p r a  t i   I l 1 ,  l I i n l i n aa u i 1 i b I  t l i s c , l . ' , i l i  ,  . i t r , t , S w i a  7 0 0 V   r v  r  t f S l . L : ' l ,
                                                        t            n                                                  1 h"
         silIaiilt;    hig|rvltag svithd                     urttt      sLl"urllt tllthnlal siit.tt]tlrr.n
                                                                                                      lirnit                                irr:itry'
         r intgrtci                                                   .l.lt
                             ntr    nltllithiivi'                              slal1-r.rp 1ing  ad                       l)ow dit,d           dit"tlv
         iirn tlr r.hagn th l)F(:\lN trlin'                         liinintig1 nitbt. bis r^.inlirlg assrllittl
                                                                                           th                                         nl
                                                 .['in1,Slvittlr-I[
         itlitry,ln aiditin.             th                              1r,is              intrtr:t               attttl.r:stitt. ttnlr,rrll;rg
                                                                                                                                   ]iIre
         stts.   nlil'q1,.iitirillg. intrrrvtiv         ,{tl                     dsign rrtillitrtizs                 atrdilrqult-        lni)3nnts
         ill th sirnp|(JNi()I:l].           tlli shnlt prti||r'iirnillt                                               utiilil llis r,vitlr  stanrlrr]
         taprll,varnishd      trns{ilrtl             tlnstiitirr, tullv intgrtl
                                                                          lr                                      aLtt-rs1ar1    iuitsll lirrits
         rttuttllvr lingtuIt rrdititlrls
                                       suii a:; uttttsht jrittlr t)ll lri. rlr"rittg
         Ornp0,]l]l
                  unt nd strndi}rr,
                                  tilbkiuitr.vst' rr ptinal iitl srlt.ssisl
        trnallv rulxSa Iin rrnrl.vltg    thrshill1.
                                                 lvhih uiimintstlrvrlr       glitulrs
                                                                     rlrllr.rr
        ausl};'11,'"
                   sIrirvilishar.g inut stl.agc1itrrs
                                  r[.                  Selltin pliatil-ls    su}tas
        ..curnrjby
                sLrplis.'l.hr'tini1{i;r.rllv l"l2 ]tl.lzis.jittl siltnifint11.1i.r
                                              i                tl              lltlrh
        thl1trirsi*1rk vr*E1.
                     arrl    llj]Vll.
                                    lninirnizigtiltrirlgst.


         l.      ltrr,sitlnfitlt g., trrj".itlit
                  220 a.c. urrnt flows rstitivly through Fl fus, and through D30l-D304 to
               ombin as bridg rtifiation. Aftr Cl L2 2 undrgs letrolyti filtr, w an
               obtaina 320V d.. voltag(Uhv).
        2.  I)tlss stt up l}rst;{iwlrr
                      t()
             J.lt "l.inSr,t,it}r-!I
                               dt:sntlt rqi bis t,l,illilirlg vitipo\,vl.ttl hi. bas
                                           a                ttr          tir
        it darr,s ptrv rlirtliirrrl i)Rll\ irl is r.intirrnl
                 th                   tir                                       .l.his
                                                                Dsitinbr,}.           |rs
        trontainbltlts. I::.irst,  ntittI
                               }tr      pli.rti" Jirnintsth
                                                   this         r:$t{' bis rl,itlirtg
        nd ssritrl  trtnptttrts'S*rldll,, bttrhrgliatir:s. urgtrt-vlttl
                                        t                           th
        hratristi ttn *lltlli,sth tttutvt-litag ti:Ills trrzrvlts lvhil stiii iJtl1ir,l.ing
                                               1.r
                 t,Vl]("
       l)o\Y",I.his llitin trt.nlll       rquirs f.nrd.bis
                                                         rvinlinglv}tihhs rrlalr
       tnassiatd                 .j'iilvSrvith-ll,
                     mlnrlis'
                           Willl                nith?]rnssi-}r}-' l-t1.l|,iiltilns
                                                             I'.t.l           1ha1
       L.qtji|.     a vry llr,-lrd                 alvr{)r}stl}ntrltirl                     150 nlW),  rsistil.ltt bis lvilirlg th      it                         tl
        BYASS it"l tlvil y:ilr,r,t.t hil:..l.hg
                                ;trL             th                      th                          rlinirnunt     tl;tltlttll{cl              ltrrt        suIiil
       i s 7 . 5 ( ) l r A .I . l r  l l Y   S S p i  i r l t i - r i s  l t s e . ' l , i l l  } ; t n l p  t 6 . . ] \ . .l - } t i s r r i  t , hr  i i l ] i i : l i r r  r t '
                                                                                       b                    tl                                       r, 
       th orvdrrv firlrn th* ltz\lN in, thlv                                                rduirlgl}rn.lri!vL.                               0l}sutlt1itlrt           ttd
       inipvingfilllal llii*rl1..                       Alld hek r;5'itis vr'irnrtant:                                   tl{.stp          ul,
       ].      I}iasrvirlirrg
             z\l1rstal1ing 1:rvr.,|.1-2 bias rvindigsLrplis
                                 th                                        liasunt
                                                                                 atrdtt.Lt!llt
                                                                                           ltl
th itttmal l2 . thrrlLrrrlr ril '4 rtiirtjltranrjthrrgh light-r"ltri
                 {,                         D7                              R2       irlr'hk
|  2 t } l ,  i n( t  2  t  l i ) " i t " s r l l t  r : irs 6 ^ - ] r , .
                                          v                .
 #:7
'i8
                         :

                                                                                  8-4
4,      1{gr-rlatitr      tii.ilttrt11ritg1r
                   I.{-.}ss
            Whrl th inpturttt ntrl in (5; t2 lrass ( illitss).silltill
                                   lf,
                                                .i
        lvavtbt.tn,i]l l rgulatl  utnltia|l, tht 1.x1i1l itrt.s dri]1}l,}(t
                                             s        ivill    {!r
       tll utrrt      rvill is{dlras),
                  vltg:
       output voltag fdbakiruit is ompltdby Zl                                            R8 DI3
5 I2 NY267 introdution




                                            ,
     ei*l      ."   !j'r,              \        ',.,   l..'




     itt F gtt*.ti**fr[ist]ri|ili{it]
                    *
     $&.ilEtPi*:                                                                                         F"r*}"'g*3iF.83j
                                                                                                                   i
                           j:t{.. :'.i: l.ti+ :;::..'.
          l.]l.:i!] t:::l.::
     it"r:r                     ;           ;        ;l'*:."...::i                                     ti F**i.r*ge
                                                                                                                  iSlti}-*il
                                                               g
     (.';*i:: :( : }).*..i::::. ;l, ..... i: +: :.,'.}l,.,!it1.. :':.:,
                                        ;
                                                                                                                                     g l.l, ri.
     31?"{Sl1E*}iu:
     ti.ittlgt*t:}8:l;: l i ] i *"ls;tl i'tr';r;i
                      fr                        l"':;lt,} ii; *x                                                                      j' t{l
              . l.; lrr s'ttei   i (       1.' r
      : t:"                                      t* \'.'




                                                                                                                                                          i:   'a
                                                                                                                                              f   ,':11




                                                                                !$tr {l}ili:
                                                                                ;'it*l       ;i:l*:   l:'rl}i:}i:,   i::l!c::i1]:;
                                                                                }'l{.ii3 .:,^tllt

                                                                                Sslts.i i3\"*il i:
                                                                                it.l" tl: lliti'iil    i,';i* i+i:l*:::*::ili            ll5* l*:*:r:




                                                                          8-5
l No voltag output

          Masur ah output trminal to se
                                                                  limint         point
                                                                        short-iruit
          whthr it is short iruit



                                                                  hk a'. and d,. onvIslon
                                                Far lssthan320V
          asure th voltge ol           L2   2                     lmnts suh s FUS, pwr

                                                                  swith,Dl D2 D D4etc,



                                                                                 .l-3
                                                                  open iruitof          plnso




          Masur whthr th voltg f                                  PI 8|7   Z| ar damagd

          pin IC (\TF) is qual to 2,8V




          easur whethr th voltag o 5                              hkrvhthr5R2 D7 C4 R4

          in IC2 (5) is qual to 6,3V                              6 ardamaged




          Test whetherth windings of T r

          shortiuit,
                   opniruit




                                                     8-6
l.   2 Unstabl voltag output,drasof arrir apability



            Tak out th outut ord, onnt                   Normal output vltage   other powr boardsovrloaded

             fals loading




          easurth wrking tmrturof

          lmnts inrardthrmomter
              by




          Is th vo|tage of lighl-mitting tubs in

          optial oupling at aout l V?




                                                                                [s it normal attr rplig Zl?




            ls the vltagof C2at 320?                                            Thris damage Dl D2 D] D4'
                                                                                           in

                                                                                forminghlf.wavertitltion




            . 5 v +| 2 v . l 2 V . ] . l V i s l o   l                          Chk l3 R8 Zl D|2
                                                                                  D




                                                               8-'7
                                                                                                                                                                  K
                 :                                                                                                                                                H
                      l.i                  ' J"
                                                                                                                                         uH                       F
                                                                                                                                                                  (,
             i:      *j''                                          *j
                                                                                                                                         \,<'d=
                                                                                                                                         vtr1.nz                  |
                 :                                                                                                                       =A?-
                                                                                                                                         U                        ro
                      ii                   --i                                                                                           <   
                                                                                                                                              i5            t,]
                                                                                                                                                                  U
     _jLj
     t:     J:   i
                      I
                      i
                      i
                                 r*ll
                                 il
                                    : 3-         i
                                                 i
                                                              -.1
                                                           , 1l                                              
                                                                                                             ll?                  c
                                                                                                                                  a
                                                                                                                                         - 'l
                                                                                                                                         oi!
                      - :' , ; " r J F i " FP                                                                oo                          q   '              *
    '*jt-*..P
      !i                           i
                                           ,
                                                               I
                                                           r]-16 oi                                          t+
                                                                                                                                         .v

                                                                                                                                                  .=
                                                     rLi
                                   i3                                                                           .

                                                                                                                                          =r
                                                                                                             f
                                                                                                                                                                  ro
                                                            '                                                                 ?             s:v

                                                                                                                                                       G1 2       N
                                                                    r                                                                       ;                     
                                                                                                                                                                  I
                                                                                                                                                  r
                                                                                                             o     ( z                            |r]
                                          



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