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OT45P
Step
Item
I nput
terminal/
signal
Test tape
Output
terminaU
test point
Adjustment
point
Adiustment for
Remarks
3
Bias Trap
Adjustment
Load the
metal cassette
tape (TDK
AC-712!, and set
for recording.
Connect the
VTVM to
T P 1 2 ( L c h ) ,
T P 1 3 ( R c h )
a n d T P 1 4
( G N D } .
L501
( L c h l
L601
( R c h l
At the
Metal posi-
position, the
bias leak re-
m a i n s t h e
same and
m t n t m u m
even when
the beat can-
cel switch is
switched from
t h e F l p o s i -
t i o n t o F l l l
p o s i t i i n .
Check that
the bias leak
i s s m a l l e r
when the beat
cancel switch
i s s e t t o F l l
position than
when set to
F l o r F l l l
position.
l 4
Record Level
Adjustment
AUX 1
400 Hz,
300mV
S p e c i a l :
T D K A C - s I 2
M e t a l :
T D K A C - 7 1 2
N o r m a l :
A B E X T C C -
102A
Connect the
VTVM and
distortion
meter to
T P 6 ( L c h ) ,
T P 7 ( R c h )
and TPS
( G N D } .
VRsOO
( L c h )
VR6OO
( R c h )
Vary the in-
put signal by
300mV
l l d B s o t h a t
the output
voltage
becomes
1 8 0 m V
when the
i n p u t s i g n a l
applied.
Adjust
VR500 and
600 so that
the K3 dis-
tortion is
less than
3% when
played back.
lf the distor-
tion is exces-
sive or if the
record/plav-
back fre-
quency res-
ponse in the
step 5,6 or
7 is out of
the specifica-
tion, adjust
by increasing
or decreasing
t h e b i a s
s l i g h t l y .
reference
value
Normal : 1 .3%
S p e c i a l : 1 . 2 %
M e t a l : 1 . 2 %
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