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Adjustment of Recording System
Connect a frequencY counter 1o
P i n 1 ( L ) o r P i n 3 ( R ) a n d P i n 2
( G N D ) o f t h e j a c k J 1 2 0 '
O S C u n i t .
A d j u s t O S C u n i t
t i l l
t h e l r e -
q u e n c y c o u n t e r r e a d s 8 5 K H z
r 0 . 1 K H z .
Note: Adiust with BEAT CANCEL switch in "N"
position'
2. Adiustment of recording current
1) Setting
. . ' ' With the deck in recording mode'
a P P I Y a s i g n a l o f 4 0 O H z , - 1 0 d B '
A d i u s t t h e R E C O R D L E V E L
control to obtain a -7 dB signal
( I
a t t h e o u t p u t t e r m i n a l , t h e n l o w e r
t h e i n p u t l e v e l b Y 3 0 d B .
2 ) T e s t t a p e . .
A C 5 1 2 s p e c i a l '
3 l L o c a t i o n
. . . S e m i ' f i x e d r e s i s t o r ' V R 5 4 1 ( L ) '
v R 6 4 1 ( L ) .
4) Procedure
Adjust, so that the output level
during recording and PlaYback of
400 Hz signal becomes equal to
t h a t d u r i n g m o n i t o r i n g .
A D J U S T M E N T L O C A T I O N D I A G R A M
i f
3. Adjustment of bias cullent
1 ) S e t t i n g
. . . S a m e a s i n l t e m 2 a b o v e '
2 ) T e s t t a p e . .
A C 5 1 2 s p e c i a l .
3 ) L o c a t i o n
. . S e m i - f i x e d r e s i s t o r V R 5 6 1 (
v R 6 6 1 ( R ) .
4) Procedure
A d j u s t , s o t h a t t h e l e v e l d i f f e r
between 8 KHz
and 400 Hz
w i t h i n 1 0 . 5 d B d u r i n g r e c o r d i
a n d p l a y b a c k o f 4 0 0 H z a n d
K H z s i g n a l s .
1. Bias frequency
1) Setting
2) Location
3) Procedure
I p
I
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