Sony TC-366 - Page 28

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