Sharp 27DV-S100 Service Manual page 34

27DV-S100
27DV-CS10
• Adjustment
1. If the indication of torque cassette meter is lower than
the setting, shift the tension spring engagement to the
part A.
2. If the indication of torque cassette meter is higher than
the setting, shift the tension spring engagement to the
part B.
• Problems caused by maladjustments
1. Much maladjusted : Tapes may get scratched.
2. Slightly maladjusted : Images onscreen may get
A B
Figure 1-20.
CHECKING THE BRAKE TORQUE
• Checking the brake torque at the supply side
Torque gauge
CCW
CCW: 2.9~9.8mN⋅m (30~100gf⋅cm)
CW: 4.9~13.7mN⋅m (50~140gf⋅cm)
Figure 1-21.
• Remove the cassette housing control assembly.
• After short-circuiting R7057 and JUMPER:420
provided on the main PWB, plug in the power cord,
then turn on the power.
• Setting
1. Set a torque gauge to zero on the scale. Place it on the
supply reel disk.
2. Switch from the FF mode to the STOP mode.
3. Disconnect the power cord.
• Checking
Turn the torque gauge at a rate of about one turn/2 sec
distorted.
Tension arm
Tension spring
CW
Supply reel disk
in the CW direction/CCW direction with respect to the
supply reel disk so that the reel disk and torque gauge
pointer rotate at equal speed, and make sure that the
value is within the setting (CW direction: 4.9 to 13.7mN·m
(50 to 140gf·cm); CCW direction: 2.9 to 9.8mN·m (30 to
100gf·cm).
• Checking the brake torque at the take-up side
Torque gauge
CW
Take-up reel
disk
CCW: 4.9~13.7mN⋅m (50~140gf⋅cm)
CW: 3.9~10.8mN⋅m (40~110gf⋅cm)
Figure 1-22.
• Remove the cassette housing control assembly.
• After short-circuiting R7057 and JUMPER:420
provided on the main PWB, plug in the power cord,
then turn on the power.
• Setting
1. Switch from the FF mode to the STOP mode.
2. Disconnect the power cord.
3. Set a torque gauge to zero on the scale. Place it on the
take-up reel disk.
• Checking
1. Turn the torque gauge at a rate of about one turn/2 sec
in the CCW direction/CW direction so that the reel disk
and torque gauge pointer rotates at equal speed and
make sure that the value is within the setting (CCW
direction: 4.9 to 13.7mN·m (50 to 140gf·cm), CW
direction: 3.9 to 10.8 mN·m (40 to 110gf·cm).
2. Adjustment of the brake torque at the supply side and
the take-up side
• Unless the supply side brake torque or take-up side
brake torque is within the setting, clean the felt surface
of reel disk (supply, take-up) brake lever, check again
the brake torque.
• If value cannot be set within the setting yet, replace the
main brake ass'y or main brake spring.
• Problems caused by maladjustments
1. From the FF or REW to the STOP mode
• Much maladjusted : The brake noise may get louder.
• Slightly maladjusted : Tapes may get slack and
34
CCW
scratched.