Yamaha K-1020 Service Manual page 12

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LI N E O UT vol ta g e is
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t he st and ard le vel )
1 I Jerr or
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B ec or d i ng
B IA S
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B IAS Te st
{L OW )
S Test
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A . C. V. M.
TA P E
B I A S
I EJ I
REC
B IA S
A D J
Cent er
r9Record the signal and
adiust so that the same
level as the above O
l eve l i s o bt ai ne d.
- lr R ec ord
and p l ay b ac k a
lk H z
{- 20d8 ) si g n al
and read the l e v el .
.2,Bec ord and p l ay b ac k a
10k H z ( -20dB)
si gn al
and adjust s o th ar th e
s ame lev el a s th e a b ov e
'- 1, lev el is ob tai n ed .
S et M E TA L ( AC -7 1 2) a nd
vR i17 (L)
Fr eq u en cy
R i 1 8 (R )
re sp o nS e
sh o uld sat isf y
Fig . N .
3O t 5mV
E ach ad ju stmen t in
S t ep s4a nd 6 sh o uld
b e co mpl ited . C o n-
f irm ad j u stme n t is
ma de wi thin 12
a du a tion w he n B IAS
TE ST is p erforme d
t h o th e r ta p e
lAc-512,2231 .
Ac-223
I NP UT
SIGNAL
( 1 kHz,
1 0 kHz,
- 2 0 d 8 )
pe rf orm B I A S TE ST
VR 1 0 9
Inorita