Sony EVO-720P - Page 232

. Checking rising edge
1) Confirm that the RF waveform rises horizontally
during playback after finishing loading, after CUE
/REV, and during playing back after FF. If not,
adjust as follows.
(In case noise occurs on the exit side (lower screen)
at rising of playback after completing loading)
(See Fig. 7-89.)
Confirm that the FWD back tension is not. too low.
If too low: _
Readjust according to 7-3-21. FWD Back Tension
Adjustment, 3 oe
If normal ; 5 he
Rotate the azimuth screw of the pinch roller clockwise
5° at a time and adjust while rechecking the rising
edge, (See Fig, 7-90.)
(In case noise occurs on the exit side (lower screen)
at rising of playback after REV)
(See Fig, 7-89.)
Loosen the guide lower toothed wheel of No.6 guide
using No.6 guide lock jig, rotate No.6 guide 90°
counterclockwise to tighten the guide lower toothed
wheel, then recheck the rising edge.
Note: If No.6 guide is raised too much, wrinkles
may occur between the capstan shaft and No.
5 guide (in section @ of Fig. 7-88.). Confirm
that no wrinkles are occurring,
(In case noise occurs on: the. exit side (lower screen)
at rising of playback after FF)
(See Fig, 7-89.)
Confirm that the FWD back tension is not too low.
{f too low:
Readjust’ according to 7-3-21, FWD Back Tension
Adjustment:
If normal :
Rotate the azimuth screw of the pinch roller clockwise
approx, §" at a time and adjust while checking the
rising edge, (See Fig. 7-90.)
Note: After finishing adjustment, be sure to check
rising of playback following to completion of
loading.
gp Returns to normal
after a while,
—
Fig. 7-89,
Pinch roller azimuth screw Ze
Pinch roller
No.6 guide
Fig. 7-90,
3. Tape running check
In playback and REV modes, confirm the following
for the flange sections (arrows in Fig. 7-91.) of guides
No.l to 6: there should be no gaps and the tape
should not be curled more than 0.3 mm. at tape
guides No.1, 2 and. 5, and there should be neither
gaps nor curls at guides No.3, 4 and 6.
Entrance side
Tape run
a
No guide No 5 guide No.6 guide
Fig. 7-91.
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