Sharp VC-384N Serviceanleitung Seite 12

Checking Procedure
1) Remove the cassette housing.
2) Unplug the power cord and short the R804 side of
R802 mounted on the system control board to the
ground.
3) Separate the reel idler from the take-up reel disk and
install a torque gauge.
4) Plug the power cord.
5) Turning the torque gauge slowly (at a speed of a turn
for every 2-3 seconds), check that take-up side
medium brake torque is more than 300g-cm.
Torque gauge head _
Reel idler Reel pulley Take-up reel disk
— +
)
Figure 18.
Checking Procedure
1) Remove the cassette housing.
2) Unplug the power cord and short pin © of AA of the
system control board to the ground.
3) Separate the reel idler from the supply reel disk and
install a torque gauge.
4) Plug the power cord.
5) Turning the torque gauge clockwise slowly (at a
speed of a turn for every 2-3 seconds), check that
supply side strong brake torque is more than 300g-cm
and more than twice as large as take-up side medium
brake torque.
Clockwise _ Reel idler
Torque gauge
69}
Lo]
Torque gauge head . Reel pulley
Reel idler Supply reel disk
Supply reel disk
=
J
Figure 19.
4. Checking procedure of take-up side strong brake
Caution:
1. Make measurement within 10 seconds after plugging
the power cord and remove the shorting.
2. Check strong brake later than medium brake.
Checking Procedure
1) Remove the cassette housing.
2) Unplug the power cord and short pin © of AA of the
system control board to the ground.
12
3) Separate the reel idler from the take-up reel disk and
install a torque gauge.
4) Plug the power cord.
5) Turning the torque gauge counterclockwise slowly
(at a speed of a turn for every 2-3 seconds), check
that take-up side strong brake torque is more than
300g-cm and more than twice as large as supply side
medium brake torque.
Counter
clockwise
"
Reel pulley ¥ ,
Take-up reel disk Take-up reel disk
Figure 20.
CHECKING PROCEDURE AND ADJUSTMENT OF SI
ROLLER FIXED GUIDE
@ Checking Procedure
1) When a video tape is running, check that the tape is
neither crumpled nor folded at its edges (see
Figure 21).
@ Adjustment
Perform the following only when the SI roller fixed
guide is really out of position.
Sl roller T-side fixed guide Guide roller
Crumpling and folding
Crumpling and folding should not occur.
should not occur.
Crumpling and folding
should not occur.
Figure 21.
A/C Head
A/C Head Ba se
AC Head Arm Spring
-
Main Char
"
A/C Head Pa te
Figure 22.
Requiremmt
@ = 26.35 +) 4mm
1) Install the guide height adjusting jig on mai chassis
A (see Figure 22).
2) Turn the adjusting nut at the top of the fixed guide
and SI roller slowly to meet the requirement
(2 = 26.35 +9!mm).