Sharp DV-NC70H (serv.man9) Service Manual ▷ View online
29
DV-NC65H/S
DV-NC70H
DV-NC70H
Set value LP 6.9
mN
⋅m (70
gf
⋅cm)
• Checking
1. Make sure that value is within the setting 6.9 mN·m
1. Make sure that value is within the setting 6.9 mN·m
(70 gf·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.
value of fluctuation as setting.
3. Set the LP record mode 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.
If the playback winding-up torque is not within the setting,
replace the limiter pulley assembly.
8-10. CHECKING AND ADJUSTMENT OF TAKE-
UP TORQUE IN RECORD/PLAYBACK
MODE
MODE
•
Load the cassette torque meter into the unit.
•
Press the picture record button, and set LP picture
record mode.
record mode.
Figure 8-9.
+20
–25
–25
+2.0
–2.5
–2.5
+2.0
–2.5
–2.5
+20
–25
–25
Cassette torque
meter
meter
8-11. CHECKING AND ADJUSTMENT OF TAKE-
UP TORQUE IN VIDEO SEARCH REWIND
MODE
MODE
• 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
Press the playback button and rewind button to set the
video search rewinding mode.
Press the playback button and rewind button to set the
video search rewinding mode.
• Checking
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
14.1
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
14.1
± 3.5mN⋅m. (144 ± 35gf⋅cm)
Figure 8-10.
Note:
Surely put the torque gauge on the reel disk to measure. If
the torque gauge is raised, accurate measurement is
impossible.
Surely put the torque gauge on the reel disk to measure. If
the torque gauge is raised, accurate measurement is
impossible.
• Adjustment
If the rewinding playback winding-up torque is not within the
setting, replace the limiter pulley assembly.
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 rota-
tion torque of supply reel disk. Read the center value of
fluctuation as setting.
The winding-up torque fluctuates due to variation of rota-
tion torque of supply reel disk. Read the center value of
fluctuation as setting.
Torque gauge
Supply reel disk
CCW
30
DV-NC65H/S
DV-NC70H
DV-NC70H
8-12. CHECKING THE VIDEO SEARCH REWIND
BACK TENSION
•
Remove the cassette housing control assembly.
•
After short-circuiting between TP803 and TP802 pro-
vided at VCR Operation PWB, plug in the power cord.
vided at VCR Operation PWB, plug in the power cord.
•
Checking
1. After pressing the play button, press the rewind button,
and set the video search rewind mode.
2. Place the torque gauge on the take-up reel disk, and turn
it counterclockwise very slowly (one rotation every 2 to
3 seconds) and check that the torque is within the set
value 3.7
3 seconds) and check that the torque is within the set
value 3.7
± 1.5mN⋅m (38 ± 15gf⋅cm).
Figure 8-11.
Torque gauge
Take-up reel disk
Note:
Set the torque gauge securely on the take-up reel disk.
If it is not secure, the measurement will be incorrect.
If it is not secure, the measurement will be incorrect.
8-13. C H E C K I N G T H E P I N C H R O L L E R
PRESSURE
* Checking can be perform with or without cassette
housing control.
• 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.
• Checking
Press the play button to set the playback mode.
Press the play button to set the playback mode.
CCW
Figure 8-12.
1. Detach the pinch roller from the capstan shaft.
Do not separate excessively. Or the pinch lever and
pinch double action lever may disengage.
pinch double action lever may disengage.
2. Engage the tension gauge adapter with the pinch roller
shaft, and pull in the arrow direction.
3. Gradually return the pinch roller, and measure the
pulling force when the pinch roller contacts the capstan
shaft.
shaft.
4. Make sure that the measured value is within setting
change to 9.8
± 2N (1.0 ± 0.2kgf).
8-14. CHECKING AND ADJUSTMENT OF
TENSION POLE POSITION
•
Setting (with cassette control housing)
1. Insert cassette tape (E-180)
2. Make the adjustment with the beginning of a E-180 tape.
2. Make the adjustment with the beginning of a E-180 tape.
Pinch roller
Tension gauge
900 - 1,200gf
900 - 1,200gf
Capstan shaft
Tension gauge adapter
Figure 8-13.
(E-180)
31
DV-NC65H/S
DV-NC70H
DV-NC70H
• Checking
1. Set a cassette tape, push the REC button to place the
1. Set a cassette tape, push the REC button to place the
unit in the SP record mode. Now check the tension pole
position.
position.
2. Visually check to see if the position of the tension pole is
within the 0 mm from the left end and the line of
Standard-A of the right side of the tension pole.
Standard-A of the right side of the tension pole.
Insert the tension pole adjustment driver to main chassis
hole, and rotate counterclockwise.
hole, and rotate counterclockwise.
Figure 8-16.
At left side from the line of Standard-A.
Figure 8-14.
Figure 8-15.
Insert the tension pole adjustment driver to main chassis
hole, and rotate clockwise.
hole, and rotate clockwise.
At right side from the line of Standard-A.
Make the adjustment with the beginning of a E-180 tape.
A
A
A
+0.5
–0.2
–0.2
Standard-A = 0 mm
+ 0.5
- 0.2
( )
+0.5 inside
-0.2 outside
-0.2 outside
Tension pole adjustment driver adjusting direction
8-15. CHECKING AND ADJUSTMENT OF
RECORD/PLAYBACK BACK TENSION
• Setting (with cassette control housing)
1. Insert cassette torque meter.
1. Insert cassette torque meter.
Figure 8-17.
Figure 8-18.
Tension pole
adjustment
driver
adjustment
driver
CW
CCW
Cassette torque
meter
meter
• Checking
1. Push the REC button to place the unit in the record mode.
2. At this time ascertain that the back tension is within the
1. Push the REC button to place the unit in the record mode.
2. At this time ascertain that the back tension is within the
setting 3.9 ~ 5.5mN
⋅m (40 ~ 56gf·cm) by seeing the
indication of torque cassette meter.
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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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