Sharp DV-NC65H Service Manual page 27

8-7. REEL DISK REPLACEMENT AND HEIGHT
CHECK
• Removal
1. Remove the cassette control housing assembly.
2. Remove the Supply/Take-up main brake ass'y.
3. Lift the tension band on the reel disk side, remove tension
band from the tension arm ass'y.
(Do not deform it excessively.)
4. Remove the reel disk.
Note:
Take care so that the tension band ass'y and main brake
ass'y are not deformed.
Tension arm ass'y
Ten
Supply main brake
Tension band
ass'y
Supply reel disk
Figure 8-4.
• 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.
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.
Notes:
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 8-12), and check the brake torque (see 8-
16 ).
Take-up main brake ass'y
Take-up reel disk
• Height checking and adjustment
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:
1. 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.
2. Whenever replacing the reel disk, perform the height
checking and adjustment.
Master plane
Reel disk
10 ± 0.2mm
27
DV-NC65H/S
DV-NC70H
Master plane
Figure 8-5.
Reel disk height
adjusting jig
Mechanism chassis
A
B
Reel disk
Figure 8-6.