Sony TC-730 Service Manual page 29

9. Record Head | Test Setup:
Track
AF ose
REC Amp
blank tape
Adjustment
to another (EXT H)
LINE OUT jack
Control/Switch Setting:
*Record volume control
specified position on page 25
*MONITOR switch
Specification:
* Lissajous figure on scope within 45°
*Playback output maximum
Notes:
(1) Before the adjustment, make sure that the
height of head is normal against the tape in
the forward mode.
Perform this adjustment after that for the
playback head was done.
10. Dummy Coil | Test Setup: pisuiase
Adjustment AE osc REC Amp 3|
MIC /'
LINE OUT jack
Control/Switch Setting:
* Record volume control
Specified position on page 25
* MONITOR switch
—~31-—
(1) Thread a blank tape.
{2) Place the unit in the record mode.
(3) Deliver a 1 kHz signal of -60 dB (0.775 mV)to the
MIC jack.
(4) Adjust the record head azimuth adjusting screw
so that the lissajous figure on the scope is
within 45°
Carefully noting how many turns the screw is
turned, adjust the record head height adjusting
screw for the maximum output on the VI'VM.
Turn the record head zenith adjusting screw in the
same direction by the same turns as noted in the
above step (5).
Note: If the maximum value for both channels can
not be obtained at the same angle of the
screw, take the mid between the two angles
and then make sure that the level difference
from the each maximum value is less than
1 dB.
(7) Check the record head azimuth adjustment.
Thread a blank tape.
Deliver a 20 kHz signal of —80 dB (77.5 W) to
the MIC jack.
Place the unit in. the stereo-record mode.
Note the VI'VM reading.
Place only L-CH in the record mode.
Adjust L504 slowly so that the VIVM readrag is
the same as the value obtained in the sep 4.
L504 (L-CH forward run)
L503 (R-CH forward run)
L506 (L-CH reverse run)
L505 (R-CH reverse run)