Arcam CD73 cd sm

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Div a C D 73 C ir c u it d escrip tio n . B y A ndy M oore . O verv ie w T he C D73 is a c o m ple te ly n ew d esig n p la tfo rm f o r A rc a m a lt h ough th e c ir c u it b uild in g b lo ck s w ill s h ow a p assin g r e se m bla n ce to th e e arlie r D iv a d e sig ns; th e m ain d if f e re n ce is th at th e m ech anis m c o ntr o l c ir c u it r y is n ow in co rp ora te d w it h in th e m ain c ir c u it b oa rd d esig n o f th e C D p la ye r. P ow er s u pply a n d P ow er s u pp ly c o n tr o l. T he m ain s p ow er s u pply e nte rs th e p la ye r v ia t h e I E C s o ck e t a t lo ca tio n S K 501 a nd is f ilt e re d b y Y C aps C 501 -“ C 502 a nd X C ap C 503, r e sis to r R 501 s it s b etw een th e N eutr a l a nd P osit iv e a .c s u pply r a ils . L 501 a nd L 50 2 f ilt e r e le ctr o m agnetic n o is e a nd r e duce s tr a y E .M .F . S W 501 A /B is u se d to s w it c h th e p rim ary fe ed t o t h e t r a nsfo rm er a t lo ca tio n T X 501, c a pacit o rs C 504 a nd C 505 h elp to p ro lo ng th e lif e e xp ecta ncy o f t h e m ain s s w it c h b y r e ducin g c o nta ct s p ark s. T he tr a nsfo rm er a t lo ca tio n T X 501 h a s m ult ip le w in din gs a nd a llo w s f o r o pera tio n fr o m 1 15v o r a 2 3 0v m ain s s u pply , th e m ain s s e le ct s w it c h a t l o ca tio n S W 502 c o nnects th e d uel p rim arie s in s e rie s o r p ara lle l d epe ndin g o n th e s u pply r e quir e m ents . F or 1 0 0v o pera tio n r e m ove J 5 04 a n d J 5 03 a nd f it J 5 02 a nd J 5 01. P le ase n o te : T he P rim ary o f t h e tr a nsfo rm er is i n te rn all y f u se d a t 1 17 d e gre es C . F ig 1 . P ow er s u pp ly id en tif ic atio n a n d r e la te d co m ponen ts . P ow er s u pply n am e A sso cia te d c o m pon en ts A C 1 -“ A C 2 On/O ff m ute c ir c u it . + 11 V (U ) D .C DAC c ard O ptio n a t S K 203 . + 8V D .C U102 ( tr a y c o n tr o l) U 202 ( la s er o p tic -“ s p in d le m oto r). R ela y R LY 501 a n alo gue s u pp ly s w it c h . - 3 0V F Fil a m en t d is p la y g rid . F 1 -“ F 2 Fil a m en t A .C s u p ply . + 12 V (A ) Aud io o utp ut o p -a m ps U 40 3, U 40 4, U 405 a n d D AC c ard o ptio n a t S K 20 3. - 1 2 V (A ) Aud io o utp ut o p -a m ps U 40 3, U 40 4, U 405 a n d D AC c ard o ptio n a t S K 20 3. + 5V (A )= (D AC ) DAC a t lo catio n U 401 a n d D AC c ard o ptio n a t lo catio n S K 203 . + 5V (D ) Dig it a l c o ntr o l d evic e s U 101, U 30 1, U 402 , U 406, U 407, U 701 a n d D AC c ard o ptio n a t S K 20 3. + 3.6 V (D ) DSP a t lo ca tio n U 201, F ocu s/T ra c kin g a n d s le d g e c o n tr o l a t lo ca tio n U 101 . W e w ill n ow b re akd ow n th e p ow er s u pplie s d ow n i n d iv id ually , p le ase r e fe r t o F ig 1 f o r in fo rm atio n o n k e y c o m po nents d riv e n b y th e in div id ual p ow er s u pply s e ctio n. D ig it a l P ow er s u pplie s A C 1 -“ A C 2 a re u se d t o d riv e th e A ud io m ute a nd f a st p o w er d ow n c o ntr o l o f t h e A udio o utp ut r e la y a t lo ca tio n R LY 4 01 , D io des D 51 8 a nd D 519 r e ctif y th e A .C a nd t h e f o llo w in g R -“ C n etw ork a nd t r a nsis to r s w it c h s ta ge Q 501 -“ Q 505 a ll o w in g f o r t h e d ela ye d s w it c h o n ( + 4 s e cs) a nd i n sta nt p ow er d ow n o f th e A udio o u tp ut r e la y th e c o ntr o l li n e is s e en a s R LY P W R o n t h e c ir c u it d ia gra m a nd s h ould m easu re + 10v D .C a t J u m per P L402. T he + 11 V (U ) s u pply r a il is p ro te cte d b y f u se F S 501 a nd w ill o nly b e u se d d ir e ctly w he n a n a ddit io na l D AC c a rd is a d ded; w e u se t h is s u pp ly r a il w it h in t h e C D73 t o d e riv e th e + 8V u sin g U 502 a nd r e se rv o ir c a pacit o r C 513, th e + 8V s u pp ly f e eds th e T ra y c o ntr o l a nd L aser o ptic d riv e p ack a ges a t lo ca tio n U 10 2 a nd U 20 2. T he - 3 0V F D .C is d eriv e d f r o m th e r e g ula to r a t l o ca tio n U 503 w e s h ould s e e - 4 4V D .C a t th e i n p ut p in o f t h is d evic e . T he p ow er s u pply f o rm s t h e V FD g rid o n th e D is p la y a nd is c u rre nt lim it e d b y r e sis to r p ack a ge R 722 ( 4 7k o hm s). F 1 a nd F 2 p ro vid e a 1 .5 V A C to d riv e t h e f ila m ent. T he + 11 v(U ) r a il is u se d to d riv e th e + 5(D ) p ow er s u p ply , th e s u pply is r e gula te d b y t h e L M 317 a t l o ca tio n U 502 a nd d riv e s th e m aste r c lo ck c ir c u it b uil t a ro und U 402 a nd t h e S P D IF c ir c u it a t l o ca tio n U 407 w e a ls o p o w er IR in s ta ge a nd D is p la y m ic ro ( U 701) fr o m t h is s u pp ly . The + 5V (D ) r a il is f u rth er r e gula te d t o p ro vid e th e + 3.6 V (D ) r a il u sin g t h e L M 317 a t lo ca tio n U 507; t h is r a il is u se d to p ow er t h e D SP a t lo ca tio n U 201 a nd t h e R .F p ro ce ss o r a t lo ca tio n U 101. P le ase n o te : U 507 h as b een c h an ged t o a L M 1086 lo w d ro p out r e g u la to r, A rc a m p art n u m ber 5 D 1086 A . P le ase n o te : T he a bove p ow er s u p plie s r e m ain o pera tio nal w hen t h e C D p la ye r is s w it c h ed to s ta ndby m ode fr o m r e m ote c o ntr o l

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Analo g ue p ow er s u pp lie s -“ S ta n db y c o ntr o l T he A nalo gu e a udio s u pply is u nder r e la y c o ntr o l a nd h a s o ve r- c u rre nt p ro te ctio n o n b oth + a n d -“ p hase s, t h is is p ro vid ed b y F S 503 a nd F S 504 th e o utp ut s id es o f t h ese f u se s d riv e in to b rid ge r e ctif ie r B R50 2, t h is b rid ge r e ctif ie r p ack a ge in te rn s u ppli e s th e u n re g ula te d + /- 1 8v D .C r a il s ( th ese a re u se d to d riv e a n o ptio n al D AC b oa rd ). T he + /- 1 8v u nre gula te d D .C r a ils a re r e gula te d b y U 504 ( + ) a nd U 505 ( -) a n d p ro vid e th e + /- 1 2V (A ) s u ppli e s. W e u se t h e u nre gula te d + 18v to c re ate t h e c le an + 5(A ) s u pply u sin g r e gula to r U 506, th is s u pply is fe d t o t h e D AC c a rd o ptio n s o ck e t a t lo ca tio n S K203 b ut w it h in th e C D73 t h is s u pp ly b eco m es k n ow n a s t h e + 5(D AC ) o n th e a udio s ta ge c ir c u it d ia gra m a nd is u se d to p ow er t h e D AC c h ip o n ly . T he R ela y a t lo ca tio n R LY 501 s w it c h es t h e lo w v o lt a ge A .C fr o m th e s e co ndary to th e b rid g e r e ctif ie r a t lo ca tio n B R 502 w e w ill a ls o s e e th at r e la y R LY 502 s w it c h es th e F 1 a nd F 2 r a ils to t h e d is p la y fila m en t, b o th if th ese r e la ys a re s w it c h ed o n/o ff b y th e c o ntr o l l i n e s e en a s S TA N D BY o n th e c ir c u it d ia g ra m s. W hen in th e o n s ta te w e s h ould s e e - 4 .8 V D .C w it h r e sp ect to D G ND o n t h e B ase o f Q 309. C lo ck g en era tio n. T he c lo ck c ir c u it is b ase d a ro un d th e 1 6.9 344M Hz c ry s ta l a t lo ca tio n X 401 th e c lo ck fr o m t h e c ry s ta l is a m plif ie d b y tr a nsis to r Q 403 b efo re b ein g d iv e d in to t w o s e para te c lo ck s tr e am s b y th e 7 4H CUO 4 b uff e r a t lo ca tio n U 402 a/b /c /d , t h e o utp ut o f U 402 c is f e d to t h e D AC ( U 401) a nd th e o utp ut o f U 402d f o rm s th e m aste r c lo ck f o r t h e D SP a t lo ca tio n U 20 1. T he th ir d c lo ck w it h in th e c ir c u it ( 4 M Hz) c a n b e fo u nd a t lo ca tio n X 701 A a nd is u se d to d riv e t h e D is p la y -“ C ontr o l -“ K eyb oard s ca n c h ip U 701. F ig 2 . L aser d io d e d ir e ct m on it o r p o in ts M ech an is m a n d M ic ro e n g in e. T hre e c h ip s h ave d ir e ct c o ntr o l o ve r th e M ech anis m th eir lo ca tio ns a n d p rim ary f u nctio ns f o llo w . U 201 C XD 3017Q D SP o 1 6k o nboard R AM e rr o r c o rre ctio n o S ub Q e rro r d ata e rr o r d e te ctio n o CPU in te rfa ce -“ U 701 d is p la y b oard o CD t e xt d em odula to r o A uto g ain fo r S erv o lo op o Focu s b ia s a dju stm ent o C PU in te rfa ce o D ir e ct in te rfa ce t o D AC U 101 C XA 2581N o RF A C -D C s u m m in g o F ocu s e rr o r a m plif ie r o Tra ckin g e rr o r a m plif ie r o Centr e e rro r a m plif ie r U 202 B A6392F P o 4 c h annel B TL d riv e r o Dir e ct tu rn ta ble m oto r c o n tr o l ( C H 4 ) o F ocu s c o il d riv e + /- ( C H2) o Focu s c o il d riv e + /- ( C H3) o Lase r s le dge d riv e ( C H1) W e c a n s im plif y th e c ir c u it if w e lo o k a t t h e s ig nal p ath f r o m th e L ase r o ptic t h is c a n b e s e en a s l a se r o ptic o utp ut a m plif ie r U 101 -“ D SP c o ntr o l m ic ro U 201 -“ L ase r tr a ck in g, F ocu s, S pin dle , S le d c o ntr o l B TL U 20 2. T he C XA 2581N a t lo ca tio n U 101 is fe d 6 lin es o f R .F o utp ut fr o m th e la se r o ptic t h ese c a n b e s e en a s in puts A -“ F o n p in s 6 -“ 1 1, th e in puts o n p in s 1 0 a nd 1 1 a re la belle d E a nd F th ese a re u se d t h e in te rn al t r a ckin g e rro r s u m m in g th is s ig nal is t h en s e en a s a V C o utp ut o n p in 2 7 . W e c a n d ir e ctly m onit o r th e R .F o utp u t fr o m th e L ase r P hoto d io des a t lo ca tio n s h o w n in F ig 2 . T hese c a n b e s e en a s t h e f o cu s o utp u ts o n r e sis to rs R 103 a nd R 104 t h ese a pp ear a bove t h e l e tte rs e a n d f o n th e d ia gra m , b etw een t h e t w o r e sis to rs t h e L ase r d io de o utp uts c a n b e s e e n o n t h e s o ld er f e ed th ru p oin ts la belle d a s a , b , c , d .