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12-4.
P.B. Head Azimuth
and Angle Adjustments
Connection:
As shown
in Fig. 12-8.
Adjusting Parts:
p.b. head
azimuth
adjusting
screw
(See Fig. 12-1)
p.b. head angle adjusting screws (See Fig. 12-1)
Switch Setting:
TAPE
SPEED
switch
.......... 19 cm/s (7% ips)
MONITOR
switch ................ TAPE
Procedures:
(1) Be sure
that the p.b. head is secured sufficiently
to the head deck with the holding screw shown
in Fig. 12-1, and
the tape pass adjustment has
been made.
(2) Playback
the
Ist tone (10kHz) of SONY
align-
ment tape, J-19-Fi or J-19-Ki.
(3)
Adjust
the
p.b.
head
azimuth
adjusting
screw
with a non-magnetic
screw driver to obtain the
maximum
reading on VTVM
in both L-CH and
R-CH.
(4) If the maximum
value of R-CH is not the same
as that of L-CH,
adjust the screw to obtain the
mean value of both L-CH
and R-CH
maximum
readings.
(5S) Apply
the back-tension
by holding
lightly the
supply reel table, reproducing the alignment tape,
and then adjust the angle of the head by loosen-
ing the two
angle adjusting screws
so that the
indication on both L-CH and R-CH
falls.
Note:
Unless
the p.b. head
is installed
at
correct
angle, the indications on the VTVM will go up.
VTVM
tape, alignment
(L)
(R)
P.B.
Amp.
LINE
OUT
Fig. 12-8
P.B. head azimuth and angle
adjustment setup
12-5.
P.B.
Head
Phase
Check
Connection:
As shown
in Fig. 12-9,
Adjusting Parts:
p.b. head azimuth adjusting screw (See Fig. 12-1.)
Switch Setting:
MONITOR
switch ........ TAPE
Procedures:
(1)
Playback
the
2nd
tone
(400Hz)
of SONY
alignment tape
J-19-Fi or J-19-Ky.
(2) Adjust
the
p.b.
head
azimuth
adjusting
screw
to obtain
the Lissajous
figure with
no phase difference as shown
in Fig. 12-10
on the oscilloscope.
(3)
Playback
the
Ist tone (1OkHz)
of SONY
alignment tape J-19-Fi, or J-19-K1.
(4) Adjust
the
p.b.
head
azimuth
adjusting
screw
exactly
so that the phase difference
between
L-CH
and
R-CH
is less than 90°.
oscilloscope
L-CH P.B. amp.
R-CH
P.B8. amp.
LINE OUT
tape, alignment
Fig. 12-9
P.B. head phase check setup
Phase
Difference
no difference
within 30°
maximum
more than 90°
(400 Hz)
allowance
Fig. 12-10
Lissajous figures
12-6.
P.B. Output
Level Adjustment and Level
Meter Calibration
Connection:
As shown
in Fig. 12-11.
Adjusting Parts:
R171 (R271) — P.B. output level adjustment
eeienatand Sees
See Fig. 12-2.
R172 (R272) — Level meter calibration
desis wevagecans See Fig. 12-2.
Switch Setting:
MONITOR
switch .......0...000. TAPE
TAPE
SELECT
switch ........... NORMAL
TAPE
SPEED
switch ............. 19 cm/s (7% ips)
25 30) =>
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