Sony TC-366 - P.B. Head Azimuth and Angle Adjustments

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) =>