Sharp VC-S2000 (serv.man2) Service Manual ▷ View online
13
VC-S2000HM
Note:
Whenever replacing the reel disk, perform the height check-
ing and adjustment.
Whenever replacing the reel disk, perform the height check-
ing and adjustment.
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-
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 REWIND MODE
TORQUE IN REWIND MODE
• Remove the cassette housing control assembly.
• After short-circuiting TP801 provided at the center
(facing to the main PWB), plug in the power cord.
• Setting
1. Set a torque gauge to zero on the scale. Place it on the
1. Set a torque gauge to zero on the scale. Place it on the
supply reel disk.
2. Press the rewind button.
3. To calculate the remaining capacity, slowly rotate the
3. To calculate the remaining capacity, slowly rotate the
take-up reel disk, and then shift it into the rewind mode.
• Checking
1. Turn the torque gauge slowly (one rotation every 2 to 3
1. Turn the torque gauge slowly (one rotation every 2 to 3
seconds) by hand in the CCW direction.
2. Make sure that the indication of torque gauge is not less
than 30mN·m (306gf·cm).
A
B
Figure 4-7.
Master plane
Reel disk height
adjusting jig
adjusting jig
Mechanism chassis
Reel disk
10
±
0.2mm
Reel disk
CHECKING AND ADJUSTMENT OF TAKE-UP
TORQUE IN FAST FORWARD MODE
TORQUE IN FAST FORWARD MODE
•
Remove the cassette housing control assembly.
•
After short-circuiting TP801 provided at the center
(facing to the main PWB), plug in the power cord.
(facing to the main PWB), plug in the power cord.
•
Setting
1. Set a torque gauge to zero on the scale. Place it on the
take-up reel disk.
2. Press the FF button.
3. To calculate the remaining capacity of the play back
3. To calculate the remaining capacity of the play back
mode, slowly rotate the supply reel disk, and then shift
it into the forward mode.
it into the forward mode.
•
Checking
1. Turn the torque gauge slowly (one rotation every 2 to 3
seconds) by hand in the CW direction.
2. Make sure that the indication of torque gauge is not less
than 30mN·m (306gf·cm).
Figure 4-9.
Torque gauge
30mN·m (306gf·cm)
or more
or more
Supply reel disk
Idler ass'y
The gauge is held at
its maximum value.
(Red mark)
its maximum value.
(Red mark)
• Adjustment
1. If the rewind winding-up torque is less than the specified
1. If the rewind winding-up torque is less than the specified
value, clean the capstan D.D. motor pulley, drive belt,
and limiter pulley with cleaning liquid, rewind again, and
check the winding-up torque.
and limiter pulley with cleaning liquid, rewind again, and
check the winding-up torque.
2. If the winding-up torque is still out of range, replace the
drive belt.
Figure 4-8.
Torque gauge
30mN·m (306gf·cm)
or more
or more
The gauge is held at
its maximum value.
(Red mark)
its maximum value.
(Red mark)
Idler ass'y
•
Adjustment
1. If the FF winding-up torque is less than the specified
value, clean the capstan D.D. motor pulley, reel belt, and
limiter pulley with cleaning liquid, and check again.
limiter pulley with cleaning liquid, and check again.
2. If the torque is less than the set value, replace the reel
belt.
CCW
CW
14
VC-S2000HM
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-
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
TORQUE IN RECORD/PLAYBACK MODE
• Remove the cassette housing control assembly.
• After short-circuiting TP801 provided at the center
• After short-circuiting TP801 provided at the center
(facing to the main PWB), plug in the power cord.
• Turn off the power switch.
• Open the cassette torque meter lid, and fix it with
• 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 REC button, and set LP picture record
• Put the weight (500g) on the cassette torque meter.
• Turn on the power switch.
• Press the REC button, and set LP picture record
mode.
CHECKING AND ADJUSTMENT OF TAKE-UP
TORQUE IN VIDEO SEARCH REWIND MODE
TORQUE IN VIDEO SEARCH REWIND MODE
• Remove the cassette housing control assembly.
• After short-circuiting TP801 provided at the center
(facing to the main 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
14.0
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)
Figure 4-11.
Torque gauge
Supply reel disk
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.
CCW
Set value LP6.9
±
2.5mN
⋅
m (70
±
25gf
⋅
cm)
500g
Cassette torque meter
Figure 4-10.
• Checking
1. Make sure that value is within the setting 6.9
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.
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.
Note:
When the torque cassette is set, put a weight (500g) to
prevent rise.
When the cassette torque meter is taken out.
Turn off the power switch.
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.
When the cassette torque meter is taken out.
Turn off the power switch.
15
VC-S2000HM
Figure 4-13.
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 8.8
to 11.8 N (900 to 1,200gf).
CHECKING AND ADJUSTMENT OF TENSION
POLE POSITION
POLE POSITION
•
Remove the cassette housing control assembly.
•
After short-circuiting TP801 provided at the center
(facing to the main PWB), plug in the power cord.
(facing to the main PWB), plug in the power cord.
•
Setting
1. Turn off the power switch.
2. Open the cassette tape (E-180), and fix with tape.
3. Set the cassette tape in loading state.
4. Put the weight (500g) on the cassette tape.
5. Turn on the power switch.
6. Make the adjustment with the beginning of a E-180 tape.
2. Open the cassette tape (E-180), and fix with tape.
3. Set the cassette tape in loading state.
4. Put the weight (500g) on the cassette tape.
5. Turn on the power switch.
6. Make the adjustment with the beginning of a E-180 tape.
CHECKING THE VIDEO SEARCH REWIND
BACK TENSION
BACK TENSION
• Remove the cassette housing control assembly.
• After short-circuiting TP801 provided at the center
(facing to the main PWB), plug in the power cord.
• Checking
1. After pressing the play button, press the rewind button,
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 3.4
3 seconds) and check that the torque is within the set
value 3.4
±
1.5mN
⋅
m (35
±
15gf
⋅
cm).
Pinch roller
Tension gauge
8.8 ~ 11.8 N
(900 - 1,200gf)
8.8 ~ 11.8 N
(900 - 1,200gf)
Capstan shaft
Tension gauge adapter
Figure 4-12.
Torque gauge
Take-up reel disk
Notes:
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.
CHECKING THE PINCH ROLLER PRESSURE
•
Remove the cassette housing control assembly.
•
After short-circuiting TP801 provided at the center
(facing to the main PWB), plug in the power cord.
(facing to the main PWB), plug in the power cord.
•
Checking
Press the play button to set the playback mode.
CCW
Figure 4-14.
500g
(E-180)
Weight to prevent
float (500g)
float (500g)
• 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.
16
VC-S2000HM
2. Visually check to see if the right edge of the tension pole
is within the 2.3
±
0.25 from the right edge of the Sup
guide shaft.
Insert the slotted screwdriver in the tension pole adjuster,
and rotate clockwise.
and rotate clockwise.
Figure 4-17.
At left side from the center line
Figure 4-15.
Figure 4-16.
Insert the slotted screwdriver in the tension pole adjuster,
and rotate counterclockwise.
and rotate counterclockwise.
At right side from the center line
Tension pole adjuster adjusting range
2.3
±
0.25
2.3
±
0.25
2.3
±
0.25
Sup guide shaft
Adjust so that the delta mark of tension pole adjuster is
within 90
within 90
°
range (left, right).
CHECKING AND ADJUSTMENT OF RECORD/
PLAYBACK BACK TENSION
PLAYBACK BACK TENSION
• Remove the cassette housing control assembly.
• After short-circuiting TP801 provided at the center
(facing to the main PWB), plug in the power cord.
• Setting
1. Turn off the power switch.
2. Open the torque cassette meter and fix with tape.
3. Set the cassette tape in loading state.
4. Put the weight (500g) on the cassette torque meter.
5. Turn on the power switch.
1. Turn off the power switch.
2. Open the torque cassette meter and fix with tape.
3. Set the cassette tape in loading state.
4. Put the weight (500g) on the cassette torque meter.
5. Turn on the power switch.
Make the adjustment with the beginning of a E-180 tape.
Tension pole adjuster
90
°
90
°
Figure 4-18.
Tension pole
500g
Weight to prevent
float (500g)
float (500g)
Cassette torque
meter
meter
Figure 4-19.
• Checking
1. Push the REC button to place the unit in the SP record
1. Push the REC button to place the unit in the SP record
mode.
2. At this time ascertain that the back tension is within the
setting (36.5 to 52g·cm) by seeing the indication of
torque cassette meter.
torque cassette meter.
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