Sharp 37VT-26H Service Manual page 30

37VT-26H(GY)
• 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.
A
14. CHECKING THE BRAKE TORQUE
• Checking the brake torque at the supply side
Torque gauge
CCW
CCW: 3.9~9.8mN⋅m (40~100gf⋅cm)
CW:
• Remove the cassette housing control assembly.
• After short-circuiting TP7701 (J930) and TP7702
(J359) provided at the left 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 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: 8.8
to 23.5mN·m (90 to 240gf·cm); CCW direction: 3.9 to
9.8mN·m (40 to 100gf·cm).
Tension arm
B
Tension spring
Figure 1-20.
CW
Supply reel disk
8.8~23.5mN⋅m (90~240gf⋅cm)
Figure 1-21.
• Checking the brake torque at the take-up side
Torque gauge
CW
Take-up reel
disk
CCW: 8.8~23.5mN⋅m (90~240gf⋅cm)
CW: 4.9~11.8mN⋅m (50~120gf⋅cm)
• Remove the cassette housing control assembly.
• After short-circuiting TP7701 (J930) and TP7702
(J359) provided at the left 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: 8.8 to 23.5mN·m (90 to 240gf·cm),
CW direction: 4.9 to 11.8 mN·m (50 to 120gf·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.
30
CCW
Figure 1-22.