Yamaha K1020 Service Manual

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Ratins i .*1li-5Lnso+Tnrrraillp;c.v.n,r.- rnrc israseolust* -Fjg: ---noiu.trotn,1
lation level ]TP6 ] LMaximum (VR107) lt-t tO oscitlation Set VRl 19 and 12O all I 1 output isI the way to the teft. I t ;;;;r.
OUT ,TAPE (REC at minimum), set lFi102 (R) i 13mV imize bias leak.
I I I BIAS ADJUST to maxi- I l, 1 mum and measure bias I i II leak at LINE OUT when I i I
--- -] -t- - -- -l 4t i1I tt tilt --l-- - tlrililnun
3 ,BrAS Leak MErAL ir-rruE n c.v ru. tIFg_ IHL;;tflttpe[d -[:19119q -!3;,1.r;; -lnJr,- *.rn,ni
llI I I recording and monitoring I I
AC-223INPUTLIN EA.C.V.M.
lsrcNnr-T
(1 kHz,1 0kHz,-20d B l
simultaneouslv {TAPEmode) by using a metal
the standard level)3-rRecord the signal andadjust so that the samelevel as the above ilrlevel is obtained.I rRecord and playback al kHz (-20d8) signaland read the level.Record and playback a10kHz (-20dB) signaland adjust so that thesame level as the above:-!, level is obtained
Set METAL (AC-712) andDerform BIAS TEST.
Frequencyresponseshould satisfyFig. N.
Ilirrili. i i ii.ii r*
lguency is used foradiustment. Bias
],,191:ll may indi-
Each adjustment inSteps4and6shouldbe complited. Con-
I simultaneously {TAPE I II I mode) by using a metal I Ilitape.lirrllltaneilia-n*Jis-iara-firvF-e.cl.rv. inic l,r,swilrglaiio s 
-ft*iri lr_jlto.sae - ---rh;;r.
I Levet ilNpuT OUT TAPE 1 the midpoint. lVR1t2 (R) i lthis unir(Through) SIGNAL ___-NR-+ ,zApplyalkHzsinewavel (equivat,
i L ,(lkHz, iLtNE tnudio oFF I sisnal from LINE lN so I i vn). ttt i 1-20d8) jlN ifrequency I I that LINE OUT voltage I L used, stiri I I j osilaror i I is 36mV (-29dBV). I lin revet r
* r-l) 4 Becording tAC-712 ILINE A.C.V.M. REC 1,r,SetVR119and 120as lVR11l {L) 10.5d8 Thereferencetapeof ]Level INPUT OUT TAPE the midpoint. lVR112 (R) this unit is AC-720(Throush) 9]9.ryAL -- -ryl_* ,zApply-alkHzsine-waveI (equivalenttoTDK. I
ilii
(equivalent to TDK- {MA). lf other tape is jused, slight difference jin level results. 
I
I 1(Through) TSIGNALT___ -L______lNR-+ jZAnOlvalkHzsinewave | (equivalentt,
i L ,(lkHz, iL|NE tnudio oFF I sisnal f rom LINE lN so I i MA). lf otheI i 1-20d8) jlN ifrequency I I that LINE OUT voltage i used, stight dt i 1-20d8) 1lN lfrequency I I that LINE OUT voltage I i used, slight difference
i I t lositlaror i l.ts36mv.(-29dBv).. I ]inrevel results.
AI
1.
Ii i i l1:::t.ii;:l1ti#ll
i i i issfxt.,lfifi:i*n^lI i I Iswitched. I_---T---r.f-_
jHecorolng A.v-t tz LINE lA.U.v.M. iHEU l.l.Uonlrrm tne lKHz re- LVR119 (Ll I Frequency IASORBiT signal isjBIAS TINPUT OUT I jTAPE ] cord/playback level VR120 (R) response lltHz and 10kHz, use(METAL) ls-tGNAL I I i}1. i.^ lslg 1): I tloulg saj- iql.kf , sisnar.and a
I I I iiiita. I I i il=:--]--- -i=----- i i .- --+----f:- -f- - --r -----15 Recording AC-712 LlNEIA.C.V.M. REC lil.Applya lkHzsinewave 1VR121 (L) l+0.5d8 Eachadiustmentin iLevel (dbx) INfUT OUT I TAPE I signal from LINE lN so ,VR122 (R) step 4 shoutd be Ii]9.ryAl__-_t_______ry.R* ] thatLI.NEoUTvoltase I ompteted. I{1kHz, jttwE laraio rdbx I is 36mV (-29dBV). I 1 l-2odB) I lN lf.equency , z Record the signal and 1 Ilosillator ] adiust so that there is I I Ij I I I I notevet differsncewhenl I lI I I I I sounce/rRpeis 1 I I Ir j I I I li*ittJ I I ]r ^ r^ - - - :--;+rrruEincnnn il^;:_ 
-l*t-frtirH.[- ty.ltgttlir.o*ru 
]l,prt!,rrr,, 
--16 Recordins LC^/ 12lTnPe cord/playback level VR120 (R) response jttHz ana 10kHz, uiNR * I (Step 4). I should sat- la lkHz signal and aritH., - 1 | lcjir ]:a,h-5.iuno prayback a j ;;;;;js.t ]iriti,  *rlokHz, I 1 I j 1OkHz(-20dB) signal I fad.iustinsrecording/i-20d8) i I I l:*i1::l::,*:*:1 I l*::l::li:::::-:vsame level as the above I ]response and confirm:1r level is obtained. ] lthat each rating is
1 I I I I 1 I I lcateanerrori__f __.____ ._+_ +_ _l ) _j z jRecorarns lnc-sr-l-trvEfAcv.rvr. -fnrc--fr-,n-o,oialtyb;.k; ivnrrs (l-) lFrequecv lAroneirtigar -i lPlf , ,lT:llT, iour I irner I III:^hr-g9?l:1911 rvRl16() li:el.-^ illl:,:{_19,k1.; y*(CrOr) SIGNAL t I J and read the level. (A lshould sat- a lkHz siqnal and a- (1kHz, -LtNEIffiio -- I  slight difference results ] isfy f ig. tvl. ]tokHz oni when1OkHz, lN I f.eouencv ] as record/playback level i 1 adjusting recording,1-20d8) i l^;ri.^, i I of thisunitissettoAC- i i lolavbackfreorrencvlN I frequencv ] as record/playback level i I ad,usting recording/ositiator ] of this unit is set to AC- : lplayback f requencyi I i I 712.1 i I lresponseandconfirmi ] i lrZlapply a 10kHz signal i I ithat each rating isi I 1 from LINE lN so that I I lsatisfied. tf otherLINE OUT voltage is i I lf r.qrny is used for36mV (-29dBV: vol- I I tadjustment. Bias indi-tage 20dB lower than I I lcator may indicate an
Recordi ngIBrASl(Normal)
RECTAPEvR1 17 (L)vR118 (R)
BIAS Test(LOW)
BIAS Test(H igh )
BIASTESTRECBIASADJCen ter.VR109
AC-112TP3A.C.V.M:O t S.V 
						

							.Y
fPilJfl1 ,0 JmjHn::li.*1 %n,fi::! loo;:l.i:l Ra,ins i *{
lz tLns o*ii-rvrrraL l11g E c nrvr.- lnEc Terns norusl-1_- --Til.ol Tnuiut - tnut 1 
-l
I llation level ]TP6 j jMaximum {VR1o7} 1L110 oscillation I ii I ] j Set VR119 and 12O all i I output is i I] ithe way to tle leltr I TalT1n ] _ _:t lBrAtL;k METaltinrF-n.ct.M. -RE--fwirr . s*r pprlo-_lriror tr-r ir-1., Gn lAdiust so as to minill
I OUT ITAPE 1(REC at minimum), set IFi102 (R) itgmV lmize bias leak. II , i A|AS ADJUST to maxi- I II mr- and measure bias II I I ,leak at LINE OUT when I ri I recordingandmonitoring 1 I i fI ; simultaneouslv(TAPE I I 1 I
mode) bY using a metal It___il-i-ip^^- s-lA-c.zlz-I-Nr Ecvlra. TnrC --1r-rs.ivnlrgi^Jr-o-Jvnrir r[iltb.sdB - - lt J.iun,p ot-l] Level INPUT OUT TAPE the midpornt. ]VR112 (R) this unit is AC-72O I(Throughl SIGNAL - -_-NR -) lz Appty a lkHz sine wave I (equivalent to TDK- |(lkHz, LtNa-A;G----oFF , signai from LINE lN so I I MA). tf othertape is i
I I l-20d8) ltN I frequencv I I that LINE OUT voltage I i lused, slight difference ii I I I losiliator l._ rs 36mV.{-29dBV). . I i ]in lever results. 1I i I I 1 I llr-,Recordthesisnal and I iI I I I I I I adiustso.thatthereis I i I 11 I i I I I lglgye..lgilJgluncewhenl i II I I I I I SoURcE/rAPEis I iI I I I t i lswitched. I I I 1
T5 lEord,ns -lnczriftru-ln.c.V.r4. -1nec [r epplvi l kHtr; ;*IvArzi tr-t ,to.sae ieruui*tn*ii - li JLevel (dbx) iINPUT IOUT I ITAPE I signar from LINE lN so 1VR122 (R) I step 4 should be II I ISIGNAL i I NR + I that LINE OUT voltaqe I comDleted. II i [kHz, [LtNETArdi.----iao I is gemv (-29dBV). - { j-20d8) ; lN lf.equency , 2 Record the signal and 1 II I I I losillator i adlustsothattherers I i I ]j I I I I I nolevel differencewhenl I
i I f i I i isounce/taeei 1 1 1 ii i i I I i jswitched 1 1 1 I- --lr-rrrrifncv-rrrr. lnic f t cor- rn.tH iu- Ivnirs rl-r frr.qruv Inoneii risnur ir - -li6lRecordins lAC-712I letaS IINPUT lour ] lrRpe I cord/playback level lvntzo (R) lresponse llkHz and 10kHz. use l
I I(METAL) SIGNAL ] I lry! - l_ lsteo a). i ishoutd sar, ]a lkHz sisnar and a ]SIGNAL] I lrun- I lStepO). i ishouldsat, ]alkHzsisnat anda(lkHz, i i iOf r l.zrRecord and playback a I isfy Fig. L. jl0kHz one whenI 10kHz, I I I 10 kHz {-20d8) signal I I Ladiusting recording/-20d8) ] I I I and adjust so that the I I lotayback frequency
I i i I J same level as the above I lresponse and confirmI I I I i!; level is obtained. I lthat each rating isi I j I I I lsatisfied.lfotherfre_
I I I I I I llYn:roys1lrorI I I I I I lquencyisusedfor1 I I I i ] ] ladiustment.BiasliIl]lllindicatormayindi.I I I I I - -L 1 rcateanerror
F*dts-ltcfEttNE fncv nlr. [nEc - -]i,n-raio orvuit--i*vR1it(L) j For-y ]-e-oner **--BrAs - ltneuf lour I iiApe 1 rtnz (-2odB) ;is;;r ]vdr ro ini 1 r.ponr lkHz and lo-kHz, use{Cr02) ISIGNAL I I I i and read the level. (A lshould sat- ja lkHz sisnal and ai(lkHz, lLtfUe lnudio 1 I slightdifference results I jisfy Fig. M. llOkHz onewhenllOkHz, ltN I frecuencv I 1 as record/playback level I j ladjusting recording/-20d8) I lositiator  I 1 of this unit rs set to AC- I playback f requency| 1 I 1 | 712.1 i I lresponseandconfirmI 1 | I j@Apply a lOkHz sisnal i I lthat each ratins isI I I | | from LINE lN so that I I lsatisfied. lf other
I
\
\
l
n.
)
)
LINE OUT voltage is I ]f requency is used for36mV (-29dBV: vol- I I ladjustment. Bias indi-tage 20dB lower than i I )cator may indicate anthe standard level) 1 I Jerror
3\
r.;1,iiiil\o-,,,
Becord i ngBIAS
l*..
BIAS Test{LOW)
S TestlH igh )
A.C.V.M.TAPE
BIASI EJ IRECBIASADJCenter
r9Record the signal andadiust so that the samelevel as the above Olevel is obtained.
-lrRecord and playback alkHz {-20d8) signaland read the level..2,Becord and playback a10kHz (-20dB) signaland adjust so thar thesame level as the above-1, level is obtained.
Set METAL (AC-712) and
vRi17 (L)FrequencyRi 18 (R)responSeshould satisfyFig. N.
3O t 5mVEach adjustment inSteps4and6shouldbe complited. Con-f irm adj ustment ismade within 12aduation when BIASTEST is performedth other tapelAc-512,2231 .
Ac-223I NPUTSIGNAL(1 kHz,1 0kHz,-20d8)
perform BIAS TEST
VR1 09Inorita 
						

							. PLAYBACK FREOUENCY RESPONSE
NR THROUGH
. RECORDING FREOUENCY RESPONSE
NR THROUGH
METAL
CrOz
NORMAL . 3dB
t4k
K-ro20
Fis. L
Fig. M
Fig. N
l-l3dB
j_i
Fig. K
. TEST POINTrL NE-i)UI N
I-t-Aill,ob T-
| 0 f ,02TNI lNlrr-PBL cirr Ha) ----r)trd trdvn Di lH A4 ,/\;;1ooru
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tt 
						

							K-r(Jzg
I LSr DATA TABLES
. LM6402G-494
O MODE VS OUTPUT
L..... Low levelH ..... High level- ..... Holding premde* ..... L changes when operation is ON.H changes at initial REC.
 ..... L changes when TAPE is selected.H changes when SOURCE is selected
Note
I
IiI
lr2IIh-
II
CLOCK, Microcomputer (800 kHz)
I +5VI
LSE INPUT, Reel stand {Take-up}
PULSE INPUT, Reel stand (Supply)
KEY SCAN INPUT
Speed Control of Reel Motor 2
Speed Contol of Reel Motor 1
Assist Motor Control
Reel Motor Control
LINE MUTE OUTPUT Signal
MONITOR SW Signal
REC MUTE OUTPUT Siqnal
REC BIAS OUTPUT Signal
CLOCK, Microcomputer (800 kHz)
{1 figure) KEY SCAN 1
DISPLAY (2 figure) KEY SCAN 2
DIGIT (3 f igure) KEY SCAN 3
OUTPUT (4 f isure) KEY SCAN 4
RESET, Microcomputer (Reset at L level)
%--l- orspr-nv orcrr (oott rev scnr.r s--D1 NORMALTAPE
METAL TAPE
a. MEMOBY
b. BtAs i:l::
c. tri
d. :<
e. TAPE
f. O_M REPEAT
g. FULL REPEAT
_, REC, 
 
TEST
REC MUTE
LINE MUTE
rt-Ay- cuE TIEVIWLIHH
FF j rrr !os!.r
i-l -t--
REEL.R
REEL
REEL
Tr:
Tt: IT.r3,
T+:
I
KE
Tr:
Tz:
Te:
t3 
						

							ITIMING CHART
MOVEMENT MODE
KEY OPERATION
srop + il,t.[ilfi Y --o-- p LA y ----o-MECHANISM ^MOVEMENT -T
Kz
REEL R
HI REEL F
ASIST R
ASIST F
II REEL
lz REEL 2
T1 : Reversing due to assist motor stop... About 14
msec
T2: Play operation time . . . About 300 msec
T3 : Delay of play + STOP . . . About 15 mesc
Ta: Reel motor running time before shifting out of the
previous mode . . . About 50 msec
STOP o---------c- REW -MECHANISMMOVEMENT
T5 : Operation time of STOP -+ REW. . . About 90 msec
T6 ; Delay before fast forward voltage . . . About 260
msec
Tr : Delay before high speed fast forward voltage . . .
About 300 msec
{
l>ruHl-Tl=-
IrllKo
ccFofol Krzj-Lll Jatro
F
o-Ff,o(Jn3
a,tt
.A
KEY OPERATION
Go BIAS
GI REC MUTE
G: MONITOR
G: LINE MUTE
HI REEL F
MOVEMENTMODE
laFn ontreE llDt n vl
llii
MECHANTSM IMECHANISMMOVEMENT IMOVEMENTSTOP {--l< R EC/ 6-/+ R EC
ll/-or	TdE
I
II
STOP 4-o--PLAY -MECHANISMMOVEMENT
FTdFI
I
|H,lbNnoRlIfI\
PAUSEMECHANISMMOVEMENT
T1 : Monitor mute delay . . . About 25psec
T2 ; Monitor switching mute . . . About 50 msec
T3: Operation of PAUSE -+ PLAY . . . About 150 msec
Ta: REC mute delav . . . About 250 msec
(to wait til running is stabilized)
Tr : PLAY operation . . . About 300 msec
T6 : Line mute delay . . . About 250 msec
t3 
						

							A
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I PRINTED CIRCUIT BOARD (Porern side)
o Main Circuit Board (1)
TO: POWER SUPPLY C. BOARD (I) 6(,2t
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I+ TO MAIN C. BOARD (3)
FROM: MAIN C. BOARD (2)
TO: MECHA UNIT 
						

							K-ro20
T PR.INTED CIR,CUIT BOARD
o Operation Circuit Board
I ttttll FRoM: MAIN c. BoARD u)
o Power Circuit Board (1)
FROM: MAIN C. EOARD (I)
FROM :MAIN C. BOARD (I)
(Pottern side)
o Main Circuit Board (b)
REMOTECONTROL
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(R,A,G,B models only)
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							K-ro20
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