Sony TC-730 Service Manual page 26

4. VU Meter Test Setup:
Calibration
REC, LINE Amp
100 kQ.
z
LINE OUT jack
VU meter
MIC jack
R334, R434
Switch Setting:
MONITOR switch SOURCE
Specification:
0 +0.5 on the VU meter scale when the line
output is 0 dB (0.775 V).
Playback Test Setup:
Head
Azimuth and
VTVM
Angle
: PB Amp
Adjustment
: 100 kQ
— =
E OUT jack J-19-A2 LIN faci
Switch Setting:
MONITOR switch
Specification:
Screw position where the maximum output is
obtained.
Notes:
(1) Before the adjustment, make sure that the
head comes in contact with the tape noxmal-
ly in forward mode.
— 28 —
(2)
Procedures
Deliver a 1 kHz signal of -60 dB (0.775 mV) to
the MIC jack.
Place the unit in the stereo-record mode.
Adjust the MIC volume control for 0 dB (0.775 V)
on the VTVM.
Adjust R334 and R434 so that the pointer of VU
meter stays at 0 + 0.5 VU on the meter.
When changing the frequency from 1 kHz to
100 Hz and 10 kHz, make sure that the VU meter
reads between -1 and +1 on the meter.
'U meter
Play back the SONY alignment tape J-19-A2
(12.5 kHz).
Adjust the playback head azimuth adjusting screw
for the maximum output on the VTVM.
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 make sure that the defference between
the output obtained by turning the screw
from the maximum output position and the
each maximum output is within 0.5 dB.
Loosen the playback head angle adjusting screws.
Slightly, hold the supply reel table by the hand.
Adjust by moving the playback head in the
direction shown by the arrows (See Fig. 3-26) so
that the level fluctuation is the least at the maxi-
mum output and the playback output does not
increase more than 0.5 dB.
Repeat the above steps (1) and (2).
Apply lock paint to the azimuth and angle
adjusting screws.
within 0.5 dB
acid . screw angle
adjusting point