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9 . 5 A P P R O X I M A T E A D J U S T M E N T O F
R E C O R D I N G C U R R E N T
1. Connect millivoltmeters to the TP terminals
No.30 (left) and No.29 (right) in the mother
ass'y.
2. Short circuit the base of Q:o: (mother ass'y)
to ground (circuit board pattern ground).
3. Set the MONITOR switch to SOURCE, and
turn the DOLBY NR switch off. Then apply a
333H2, - 10dBv (316mV) signal to the INPUT
terminals.
4. Start the CT-F950 in recording mode.
5. Adjust the INPUT level control to obtain
readings of -3dBv (700mV) in the millivolt-
meters.
6. Next connect one millivoltmeter across TP
terminal No.40 (left) and ground (mother trs'y),
and the other across TP terminal No.43 (right)
and ground.
7. Set the TAPE switch to the STD position, and
adjust VRzos (left) and VRzoo (right) to ob-
tain readings of 1.55mV.
8. AIso check that the followng readings are ob-
tained in the millivoltmeters when the TAPE
switch is changed to the other positions.
TAPE Switch Position
A C M i l l i v o l t m e t e r R e a d i n s
METAL
CrO:
Fe-Cr
2 . 1 4 m V
1 . 8 4 m V
1 . 4 5 m V
GT-FS|5c,
9 . 6 E R A S U R E C U R R E N T A D J U S T M E N T
1. Set the TAPE switch to the METAL position
a n d t u r n t h e I N P U T v o l u m e c o n t r o l d o w n t o
minimum level. Then connect an millivoltmeter
across the mother ass'y TP terminals Nos.45 and
7 6 .
2 . P r o c e e d i n r e c o r d i n g m o d e w i t h o u t a n y i n p u t
signal (but with an unrecorded tape being used).
3 . A d j u s t V R r o r s o a s t o o b t a i n a m i l l i v o l t m e t e r
r e a d i n g o f 1 6 0 m V .
9 . 7 B I A S T R A P A D J U S T M E N T
1 . C o n n e c t m i l l i v o l t m e t e r s a c r o s s t h e m o t h e r a s s ' y
T P t e r m i n a l N o . 4 2 ( l e f t ) a n d g r o u n d , a n d T P
t e r m i n a l N o . 3 9 ( r i g h t ) a n d g r o u n d .
2 . S e t t h e T A P E s w i t c h t o t h e M E T A L
p o s i t i o n ,
and turn the INPUT level control up to max-
imum level.
Proceed in recording mode (with
unrecorded tape) but without any input signal.
3 . A d j u s t L z o s ( l e f t ) a n d L z o a ( r i g h t ) t o o b t a i n
m i n i m u m r e a d i n g s i n t h e m i l l i v o l t m e t e r s .
4 . T h e n
c h a n g e t h e M O N I T O R
s w i t c h t o t h e
SOURCE position, and connect the mi-llivolt-
meters across the mother
ass'y TP terminal
N o . 1 6 ( l e f t ) a n d g r o u n d , a n d T P t e r m i n a l N o . 1 5
( r i g h t ) a n d g r o u n d . A d j u s t L r o r ( l e f t ) a n d L t o z
(right) to again reduce the millivoltmeter read-
i n g s t o m i n i m u m l e v e l .
N o t e
This adjustment
must
be performed
os carefully
oB pos-
sible since the result will influence
the lrequency
resPonae
d u r i n g r e c o r d i n g a n d p l o y b a c h
m o d e s w h e n t h e D O L B Y
NR sutitch is on.
l C a m p l i f i e r
@ @
@ @
a s s e m b l y ( R c h )
F i g . 9 - 4
A d j u s t m e n t p o i n t s
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