Read Sharp DV-NC65H (serv.man13) Service Manual online
32
DV-NC65H/S
DV-NC70H
DV-NC70H
• Adjustment
1. If the indication of torque cassette meter is lower than
1. If the indication of torque cassette meter is lower than
the setting, shift the tension spring engagement to the
part A.
part A.
2. If the indication of torque cassette meter is higher than
the setting, shift the tension spring engagement to the
part B.
part B.
Figure 8-19.
8-16. CHECKING THE BRAKE TORQUE
• Checking the brake torque at the supply side
Figure 8-20.
• Remove the cassette housing control assembly.
• After short-circuiting between TP803 and TP802 pro-
• After short-circuiting between TP803 and TP802 pro-
vided at VCR Operation PWB, plug in the power cord.
• 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
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
supply reel disk.
4. Please check Idler gear not contact with reel relay gear
(SU side)
Tension arm
Tension spring
CCW
CW
Supply reel disk
Torque gauge
A
B
CCW: 4.41
±
mN
⋅m (45
±
gf
⋅cm)
CW:
4.12
±
mN
⋅m (42
±
gf
⋅cm)
•
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: 4.12
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: 4.12
± mN·m
(42 gf·cm); CCW direction: 4.41 mN·m (45
15
gf·cm).
+15
–12
–12
+2.0
–1.5
–1.5
+20
–15
–15
+1.5
–1.2
–1.2
+2.0
–1.5
+1.5
–1.2
–1.5
+1.5
–1.2
+20
–15
+15
–12
–15
+15
–12
• Checking the brake torque at the take-up side
• Remove the cassette housing control assembly.
• After short-circuiting between TP803 and TP802 pro-
• After short-circuiting between TP803 and TP802 pro-
vided at VCR Operation PWB, plug in the power cord.
• 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
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.
4. Please check Idler gear not contact with reel relay gear
(TU side)
• Checking
1. Turn the torque gauge at a rate of about one turn/2 sec
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: 4.41
and torque gauge pointer rotates at equal speed and
make sure that the value is within the setting (CCW
direction: 4.41
± 1
mN·m (45
±
gf·cm), CW direction:
4.12
± 1.
mN·m (42
to
gf·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.
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.
Figure 8-21.
CW
Torque gauge
CCW
Take-up reel
disk
disk
CCW: 4.41
±
mN
⋅m (45
±
gf
⋅cm)
CW:
4.12
±
mN
⋅m (42
±
gf
⋅cm)
+2.0
–1.5
+1.5
–1.2
–1.5
+1.5
–1.2
+20
–15
+15
–12
–15
+15
–12
+2.0
–1.5
–1.5
+20
–15
–15
+1.5
–1.2
–1.2
+15
–12
–12
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