DOWNLOAD Sharp VC-M314 (serv.man8) Service Manual ↓ Size: 9.08 MB | Pages: 99 in PDF or view online for FREE

1. Remove the cassette housing control assembly.
2. Pull the tension band out of the tension arm ass'y.
3. Remove the Supply/Take-up main brake ass'y.
4. Open the hook at the top of the reel disk, and remove the

reel disk.

Note:
Take care so that the tension band ass'y and main brake
ass'y (especially soft brake) are not deformed.

4. Assemble the Supply main brake ass'y.
Notes:
1. When installing the reel disk, take due care so that the

tension band ass'y is not deformed and grease does no
adhere.

2. Do not damage the Supply main brake ass'y. Be careful

so that grease does not adhere to the brake surface.

• Reassembly (Take-up reel disk)
1. Clean the reel disk shaft and apply grease (SC-141) to

it.

2. Align the phase of the reel disk to that of the reel relay

gear and to install a new take-up reel disk onto the shaft.

3. Check the reel disk height and reassemble the take-up

main brake ass'y.

Note:
1. Take care so that the Take-up main brake ass'y is not

damaged. Take care so that grease does not adhere the
brake surface.

2. After reassembly, check the video search rewind back

tension (see page 16), and check the brake torque (see
page 18).

1. Set the master plane with due care so that it does not

contact the drum.

2. When putting the master plane, shift the reverse guide

a little in the loading direction. Care must be taken since
excessive shift results in damage.

Note:
• Check that the reel disk is lower than part A but higher

than part B. If the height is not correct, readjust the reel
disk height by changing the poly-slider washer under the
reel disk.

Note:
When the tension band ass'y is pressed in the direction of
the arrow for removal, the catch is hard to be deformed.

1. Clean the reel disk shaft and apply grease (SC-141) to

it.

2. Match the phases of reel disk and reel relay gear, and set

the new reel disk.

3. After checking the reel disk height, wind the tension

band ass'y around the reel disk, and insert into the hole
of tension arm ass'y.

Tension arm ass'y

Supply reel disk

Take-up reel disk

Master plane

Reverse
guide

Position
pin

Take-up main brake ass'y

Supply reel disk

Cassette lock
release shaft

Take-up reel disk

Tension band ass'y

Supply main brake ass'y

Note:
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-

time measurement.

• Setting
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

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

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

Master plane

Reel disk height
adjusting jig

Mechanism chassis

Reel disk

10 

±

 0.2mm

Reel disk

• 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

mode, slowly rotate the supply reel disk, and then shift
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).

Torque gauge

30mN·m (306gf·cm)
or more

Supply reel disk

Idler ass'y

The gauge is held at
its maximum value.
(Red mark)

• Adjustment
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.

2. If the winding-up torque is still out of range, replace the

drive belt.

Torque gauge

30mN·m (306gf·cm)
or more

The gauge is held at
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.

2. If the torque is less than the set value, replace the reel

belt.

CCW

CW

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-

time measurement.

• Setting
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 

±

 3.9mN

⋅

m. (144 

±

 40gf

⋅

cm)

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.

• Adjustment
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.

CCW

Set value LP6.9 

±

 2.5mN

⋅

m (70 

±

 25gf

⋅

cm)

500g

Cassette torque meter

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.

3. Set the LP record mode and make sure that the winding-

up torque is within setting.

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.

1. Detach the pinch roller from the capstan shaft.

Do not separate excessively. Or the pinch lever and
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.

4. Make sure that the measured value is within setting 8.8

to 11.8 N (900 to 1,200gf).

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.

• 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 3.4

±

1.5mN

⋅

m (35

±

15gf

⋅

cm).

Pinch roller

Tension gauge
8.8 ~ 11.8 N
(900 - 1,200gf)

Capstan shaft

Tension gauge adapter

Torque gauge

Take-up reel disk

Set the torque gauge securely on the take-up reel disk.
If it is not secure, the measurement will be incorrect.

• Checking
Press the play button to set the playback mode.

CCW

500g

(E-180)

Weight to prevent
float (500g)

• Checking
1. Set a cassette tape, push the REC button to place the

unit in the SP record mode. Now check the tension pole
position.