Sharp VT-G14 Service Manual page 30

VT-G14
VT-G21
REEL DISK REPLACEMENT AND HEIGHT
CHECK
• Removal
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.
Tension arm ass'y
Supply main brake ass'y
Tension band ass'y
Supply reel disk
Figure 1-4.
Note:
When the tension band ass'y is pressed in the direction of the
arrow for removal, the catch is hard to be deformed.
Figure 1-5.
• Reassembly (Supply reel disk)
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.
4. Assemble the Sup main brake ass'y.
Take-up main brake ass'y
Take-up reel disk
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 Sup 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.
Notes:
1. Take care so that the Tu 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 33), and check the brake
torque (see page 36).
• Height checking and adjustment
Notes:
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.
Supply reel disk
Cassette lock
release shaft
Take-up reel disk
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.
30
Master plane
Reverse
guide
Position
pin
Figure 1-6.