Yamaha K-1020 Service Manual page 11

A
E^1",'J#""'F*" ,'.t i'H[lT:l'I '.]" i
-
%":::1:i:::' loo,;:H""p Ratins i "".*1
li-5Lnso'"+Tnrrraillp;c.v.n,r.- rnrc
israseolust*
-Fjg: ---noiu.trotn",1
l ati on l ev el
]TP 6
]
LMax i m u m ( V R 10 7 )
l t - t t O os c i t l a t i o n
'
S et V R l 19 and 1 2 O a l l
I
1 ou t pu t i s
I
t he w ay t o t he t e f t .
I
t ; ; ; ; r .
OU T
,T A P E
( R E C at m i ni mum ) , se t
l Fi 1 02
( R )
i 13 m V
i m i z e
b i a s l e ak .
I I I
B I A S A D JU S T t o m a x i -
I l
, 1
m um a nd m easu r e b i as
I i I
I
l eak at LI N E O U T w h e n
I i I
- --
- ] -t - - -- -l
4t" "
i 1I
tt t" " i l t
- -l- - -
tlrililnu'n'
3 ,BrAS Leak MErAL ir-rruE n c.v ru. tIFg_ IHL;;tflttpe["d
-[:19119q -!3;,1.r';;
-lnJr,"-'"
*.rn,ni
l l
I I I
r eco r di ng an d mo n i t or i ng I
I
AC-223
INPUT
L I N E A.C .V .M .
lsr cN n r -
T
(1 kHz,
1 0kHz,
-2 0 d B l
si m ul t a neousl v {T A P E
m ode) by usi ng a m e t al
t he st and ar d l ev el )
3- r R ec or d t he s i gn a l a nd
adj us t so t hat t h e s a m e
l eve l as t he abo ve i l r
l eve l i s obt ai ned .
I r R ec or d and pl ay b ac k a
l kH z ( - 20d8) s i gn al
and r ead t he l ev el .
R ec or d and pl ay b ac k a
1 0kH z ( - 20dB ) s i gn a l
and adj us t so t h a t t h e
same l ev el as t he a bo v e
:-!, l ev el i s obtained
S et M E TA L ( A C - 71 2) an d
D er f or m B I A S TE S T .
Fr e q ue nc y
r es p on se
s ho ul d s at i s f y
Fi g. N .
I'l''ir'rili. i i "ii.ii r*
l g u en cy i s u se d fo r
a di us t m e nt . B i a s
],,191":l"l
may indi-
E ac h a dj us t me nt i n
S t ep s4 an d 6 s h o ul d
b e c om p l i t e d . C o n-
I si mul taneous ly {TA P E
I I
I
I
mode) by using a metal
I
I
litape.li
r r l l l tane'i l
ia-n""*Ji"s-iara-firvF-e.cl.rv.
inic
l,r,s"wilrgl"aiio "s
-ft*iri
lr_jlto.sae
- ---rh;;r.
I
Levet
ilNpuT
OUT TAPE 1 the mi dpoi nt.
l V R 1t2 ( R ) i
l thi s uni r
(T hrough) SIG NAL
___-NR -+
,zA ppl y al kH zs inew av el
( equiv at,
i
L
,(lk Hz , iLtNE tnudi o
oFF
I s i snal from LIN E l N so I
i
v n). t t
t
i
1-20d8) jlN
ifrequency I
I that LIN E OU T vol tage I
L
us ed, st ir
i I
I
j osi laror
i
I i s 36mV (-29dB V ).
I
l in rev et r
*
" r -l
) 4
Bec ordi ng
tA C-7 12
IL IN E A. C. V.M . R E C 1 ,' r , S e t V R 1 19and 12 0 as
l V R 1 1l { L)
10 . 5d 8
T he r e f er e nc et ap eo f
]
Lev el INPUT OU T T A P E t he m i dpo i nt .
l V R 1 12 ( R )
t h i s u ni t i s A C -7 20
( Throus h)
9 ]9 .r yAL - - - r y l_ * , z A ppl y- a l kH zs i n e- w av eI
( e q ui v a l en tto TD K .
I
i lii
( e q ui v a l en t t o T D K -
{
M A ) . l f ot h er tap e i s
j
u s ed , s l i g h t d i ffe re nc e j
i n l e ve l r es u l ts .
I
I 1( Through)
TSIGNAL T_ _ _ - L _ _ _ _ _ _l N R - +
j ZA n O l v al k H z si n e w a ve
|
( e q ui v a l en tt,
i
L
,(lkHz,
i L | N E tn u di o
o F F
I s i s nal f r om LI N E l N s o I
i
M A ) . l f ot h e
I
i 1-2 0d 8 )
j lN
ifr eq u e n cy
I
I t h at LI N E O U T v ol t ag e i
u s ed , s t i g ht d
t
i 1-2 0d 8 ) 1 l N
lfr eq u e n cy
I
I t h at LI N E O U T v ol t ag e I
i
u s ed , s l i g h t d i ffe re nc e
i I
t
lo s itl a r o r i l . 't s 36m v . ( - 29dB v ) . .
I
] i n r e ve l r es u l ts .
A
I
1.
I
i
i i l''1:::t'.ii;:l1ti#"ll
i i
i
issfxt.,lfifi:i*n'^l
I
i
I Isw i tc hed. I
_ - -- T- - - r .f - _
j H ec or ol ng A .v- t tz
L I NE lA .U .v .M.
i HE U
l . l . U onl r r m t ne l K H z r e -
L V R 1 1 9 ( L l I Fr e q ue nc y
I A S O R B i T s i g na l i s
j BIAS
TINPUT
OU T I
j T AP E
] c or d/ pl aybac k l ev e l
V R 1 20 ( R )
r e sp on s e l l t H z a nd 10 k H z , u s e
(METAL) ls-tGNAL I
I
i}1.
i.^ lsl"g 1): I
tloulg saj- iql.kf , sisnar.and
a
I I I i" iii" t ' "a . ' I I
i
i
l= : - - ]- - -
-i = -- ---
i ' i .-
- - + - - - - f:- - f - - - - r
--- --1
5 Rec ordi ng A C-7 1 2 L l N EI A.C .V .M . R E C
l i l . A ppl ya l k H z si n ew av e 1 V R 1 2 1 ( L) l + 0 . 5d 8
E ac ha d i us tm en ti n
i
Lev el (dbx )
INfUT
OU T I T A P E I s i gna l f r om L I N E l N s o , V R 12 2
( R )
s t e p 4 s h ou td be
I
i ]9 .ry A l__-_t _______ry .R *
] t hatLI. NE oU Tvol tase
I
" omp tete d.
I
{ 1 k Hz , j tt wE lar aio
rdbx
I i s 36mV (-29dB V).
I 1 l
-2 o d B) I lN
lf. e qu e n cy
, z R eco r d t he si gn a l a nd
1 I
lo s il la t or
] a di us t so th at t h e r e i s
I I I
j
I
I I
I no t evet d i f f er s nc e w he n l
I l
I I I I
I s o u n ce /rR p e i s
1 I I I
r j
I I I l i * i t" t ' J I
I
]
r ^ r^ - '- - '':--;+rrruEincnnn
il^;:_
-l*"t-frtirH.[- ty.ltgttlir.o*r"u
]l,p"rt!,rrr,,
--1
6 Recordins
LC^/ 12
l T n Pe
c or d/ pl aybac k l ev e l
V R 1 20 ( R )
r e sp on s e
j t t H z a na 10 k H z , u
i NR
*
I ( S t ep 4 ) .
I
sh o ul d s at -
l a l k H z si g n al an d a
ritH.,
-
1
|
lcjir
]:a,h-""5.i'uno
prayback
a j
;;;;";js.t
]iriti, '""" *r'"'
lo kHz,
I 1 I
j
1O kH z ( - 20dB ) s i gn a l
I
f a d. i us t i n sr e c o rd i n g/
i-20d8) i I
I l:*""i1::l::,*"":*:"1 I l*::l::li::':::-:v
s ame l evel as t h e a bo ve
I
] r e s po ns e an d c o nf i rm
: 1r l e vel i s obta i n ed .
]
l t h a t e ac h r a ti n g i s
1 I I
I
I 1 I I
l cateaner ro r '
i __f
_ _ . __ _ _ . _ + _
+ _
_ l
)
_
j z jRecorarns lnc-sr-l-trvEfAcv.rvr. -fnrc--fr-,n-"o,oi"alt"yb;.k; ivnrrs (l-) lFreque"cv lAroneirtig"ar
"-
i lPlf ,
,lT:llT, iour I
irner I III:^hr-g9?l:1911
rvRl16(") li:'el'.-^ illl:,:{_19,k1.;
y*
( C rOr )
S IGNAL
t I
J and r ead t he l ev el . ( A
l s ho ul d s at - a l k H z si qn al an d a
-
(1 kHz,
-L tN E Iffi io
- -
I
' s l i ght di f fe r ence r e su l t s
] i s f y f i g. t v l .
] t o k H z on i w he n
1 OkHz,
lN I f.e o u e n cv
] a s r e cor d/ pl ayb ac k l ev el i
1
' ad j us t i n g r e co rd i ng ,
1- 20 d 8 )
i l ^ " ;r i.' ^ ,' i
I o f t hi suni t i s set t oA C -
i
i
l o l a v ba ck f r e o rr en c v
lN I frequencv
] as record/playback level i
I
'ad,usting recording/
'o sitiator
] o f thi s uni t i s s et to AC -
:
l play back f re q u e ncy
i
I
i
I 7 12.1
i I l res ponsea nd con f ir m
i ] i
lrZlapply a 10kHz signal i
I
ithat each rating is
i I
1 from LIN E l N s o that
I I l sati sfi ed. tf ot h er
LINE OUT voltage is
i I
lf r."qr"n"y is used for
36mV (-29dBV: vol-
I I
tadjustment. Bias indi-
tage 20dB lower than
I I
lcator may indicate an
Rec ordi ng
I B r A S
l ( N orm al )
R E C
T A PE
v R 1 1 7 ( L )
v R 11 8 ( R )
BIA S Tes t
( LO W )
BIA S Tes t
( H i gh )
B IA S
T E ST
R E C
B IA S
A D J
C e n te r.
V R 109
AC-1 1 2
TP3
A. C. V.M
:O t S.V