Sharp VC-780E - Page 18

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 *
<TY
AIC
head
tilt
adjusting
jig
Ter
(JiGACH-F18)
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
completed,
roughly
adjust
the
tape
drive
train
using
an
alignment
tape.
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.
Set
the
tilt
angle
of
the
A/C
head
as
shown
in
Fig.
‘ -
~