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12-8.
P.B. S/N
Ratio Check
Connection:
As shown
in Fig. 12-13.
Switch Setting:
MONITOR
switch .........0... TAPE
Procedures:
(1) Playback
the
2nd
tone
(400Hz)
of
the
SONY
alignment
tape
J-19-Fi or J-19-Ki
and
be
sure
that
the
VITVM
reading
is
OdB (0.775V).
If not, make the p.b. output
level
adjustment
again.
(2) Set
the
machine
in FWD
mode
with
no
tape,
by
pushing
the
shut-off
lever
with
finger.
(3) Be sure that the VTVM
reading is less than
-48dB (3 mV).
(4) S/N ratio will change by reversing the sense
of motor, so that it is necessary to select the
connection
of the joint terminals connected
to the motor leads to obtain better S/N ratio.
tape, alignment
VTvM
Fig. 12-13
P.B. S/N ratio check setup
12-9.
Trap Coil Adjustment
Connection:
As shown in Fig. 12-14.
Adjusting Parts:
1102 (202)
sissies.
See Fig. 12-2
Procedures:
(1)
Set
the
MIC
VOLUME
to
the
minimum
position.
(2) Place the machine in record mode.
(3) Connect
the
VTVM
to
the
check
point
shown in Fig. 12-2.
(4) Adjust L102 (L202) to obtain the minimum
reading on the VIVM.
Note:
If the VI'VM
reading
is not less than -30dB
(24.5 mV),
try to move
the positions of MIC
jack leads and NOISE SUPPRESS
switch leads.
£102. 202
-o---4
C128. 228
Q105.
205
4}
—
-*,
head,
record
Fig. 12-14
Trap coil adjustment setup
12-10.
Record
Head Azimuth
and Track
Position Adjustments
Connection:
As shown
in Fig. 12-15.
Adjusting Parts:
Record
Head
azimuth
adjusting screw
height adjusting screw
zenith adjusting screw
beast ituteee See Fig. 12-1]
Switch Setting:
MONITOR
switch ......... TAPE
VR Setting:
AUX
VOLUME
............. indicated
on page 25
Procedures:
(1) Be sure that the trap coil adjustment has
been made.
(2) Thread a blank tape.
(3) Deliver a 15 kHz siganl of -30 dB (24.5 mV)
into
the
AUX
INput jack and record
the
signal on the blank tape.
(4) Adjust
the record
head azimuth adjusting
screw
so
that
the
VTVM
reading
is the
maximum
for both
L-CH
and
R-CH.
In
case
the
maximum
reading
of R-CH
is not
the
same
as one
of L-CH,
take the mean
value between
L-CH
and R-CH.
(The mean
value should
not be fallen more
than
1dB
from
the maximum
value.)
(5)
Deliver
a
1 kHz
signal
of -10dB
(0.24V)
into the R-CH
AUX
INput jack and record
the signal on the blank tape.
(6) Adjust the height adjusting screw to obtain
the
maximum
reading
on the VITVM
and
memorize
the angle of turns of the screw.
meee Yee
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