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VC-790ET
6
'Set the AVC head tilt angle according'to Righ #22. &
'Play 'an alignment 'tape and roughly:adjuststhe
height of the A/C head, - visually, .by-turming 'the
" AIC: head adjusting hexagon nut @- withthe box
~ driver GiIGDRIVER1 10-7) until the tape comes"to
the position shown below. (See Fig. 1-19.) 's 6:
. Set the mechanism to the loading mode. Place
the A/C head tilt adjusting jig on the main chassis
as shown
in Fig. 1-21. Slowly turn the tilt
abjusting screw © with a Phillips screwdriver
until there is no gap between the jig and the A/C
head.
:
" ,
e
*
Reverse guide
{JiGRVGH-F18}
i
Figure 1-21.
Be sure there is no gap.
ft Is easier to see a gap, if a piece of white paper
is placed behind the head and jig.
© Tilt adjusting
Figure 1-22.
height adjusting jig
HELGHT:ADJUSTMENT OF RETAINING
GUIDE AND:'REVERSE GUIDE 2)
ans
1
S.ftl
we
ob
oye
ee 2a
e, Adjustment
; Before the rough adjustment of tape drive train,
, check that the retaining guide'and reverse guide
. heights are within' the specified values of Fig. 1-
~ 23, by using the special jigs.
|
2. if the retaining guide height is not correct,adjust
the height with the box driver JiGDRIVER1 10-4).
3. If the reverse guide height is not correct, use the
* height adjusting washers.
Retaining guide
13.57 mm
XWHIZ25-05050
.
XWHIZ25-02050
XWHJZ25-01050
XWHJZ25-04050
Figure 1-23.
ADJUSTMENT OF TAPE DRIVE TRAIN
1.
2.
Check and adjust the position of the tension pole
and the back tension.(See pages 15 )
1-22,
Note:
If the A/C head is adjusted, check and set the tilt
_.angle as in the case of replacement.
3. When the above adjustments have been
a. Connect the oscilloscope to the test points. for
PB chroma output (TPS01) and head switching
_ pulse (TP502). Allow the PB CHROMA signal to,
be triggered by the head switching pulse of
TP502.
|
_b. Loosen the setscrew of the guide roller, and
tighten it loosely by using the special bladed
screwdriver (JiGDRIVERH-4) to such an extent
that the guide roller turns smoothly.
c. Set the alignment tape (VROCPSV) on the reel
disk.
Note:
Attach a 400 to S00g.weight to the cassette
tape when a cassette tape is placed on the ree!
disk with the cassette
housing
assembly
_ removed.
' -
~
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