Sharp 13VT-L200 Service Manual page 26

13VT-L200
Notes:
1. Hold the torque gauge by hand so that it is not moved.
2. Do not keep the reel disk in lock state. Do not allow
long-time measurement.
CHECKING AND ADJUSTMENT OF TAKE-
UP TORQUE IN RECORD/PLAYBACK MODE
• Remove the cassette housing control assembly.
• After short-circuiting TP7701 and TP7702 provided
at the left on the main PWB, plug in the power cord.
• Turn on the power.
• Open the cassette torque meter lid, and fix it with
tape.
• Load the cassette torque meter into the unit.
• Put the weight (500g) on the cassette torque meter.
• Turn on the power switch.
• Press the picture record button, and set EP picture
record mode (x3).
Set value EP6.9 ± 2.5mN m (70 ± 25gf cm)
500g
Cassette torque meter
Figure 1-10.
• Checking
1. Make sure that value is within the setting 6.9 ± 2.5mN·m
(70 ± 25gf·cm).
2. The winding-up torque fluctuates due to variation of
rotation torque of limiter pulley ass'y. Read the center
value of fluctuation as setting.
3. Set the EP record mode (x3) and make sure that the
winding-up torque is within setting.
• Adjustment
If the playback winding-up torque is not within the setting,
replace the limiter pulley assembly.
Note:
When the torque cassette is set, put a weight (500g) to
prevent rise.
CHECKING AND ADJUSTMENT OF TAKE-
UP TORQUE IN VIDEO SEARCH REWIND
MODE
• Remove the cassette housing control assembly.
• After short-circuiting TP7701 and TP7702 pro-
vided at the left on the main PWB, plug in the
power cord, then turn on the power.
• Setting
Press the playback button and rewind button to set the
video search rewinding mode.
• Checking
1. Place the torque gauge on the supply reel disk, and
turn it counterclockwise very slowly (one rotation every
1 to 2 seconds) and check that the torque is within the
set value 14.0 ± 3.9mN m. (144 ± 40gf cm)
Torque gauge
CCW
Figure 1-11.
Note:
Surely put the torque gauge on the reel disk to measure.
If the torque gauge is raised, accurate measurement is
impossible.
• Adjustment
1. If the rewinding playback winding-up torque is not
within the setting, replace the limiter pulley assembly.
Note:
The winding-up torque fluctuates due to variation of
rotation torque of supply reel disk. Read the center value
of fluctuation as setting.
26
Supply reel disk