Read Sharp VC-S2000 (serv.man13) Service Manual online
9
VC-S2000HM
4. ADJUSTMENT, REPLACEMENT AND ASSEMBLY OF MECHANICAL UNITS
The explanation given below relates to the on-site general service (field service) but it does not relates to the adjustment
and replacement which need high-grade equipment, jigs and skill. For example, the drum assembling, replacement and
adjustment service must be performed by the person who have finished the technical courses.
and replacement which need high-grade equipment, jigs and skill. For example, the drum assembling, replacement and
adjustment service must be performed by the person who have finished the technical courses.
4-1 MECHANISM CONFIRMATION ADJUSTMENT JIG
So as to perform completely the mechanism adjustment prepare the following special jigs. So as to maintain the initial
performance of the machine the maintenance and check are necessary. Utmost care must be taken so that the tape is
not damaged. If adjustment needs any jig, be sure to use the required jig.
performance of the machine the maintenance and check are necessary. Utmost care must be taken so that the tape is
not damaged. If adjustment needs any jig, be sure to use the required jig.
JiGTG1200
CN
JiGMP0001
BY
1.
Torque Cassette Meter
JiGVHT-063
CZ
No.
Jig ltem
Part No.
Code
Configuration
Remarks
JiGTG0090
CM
3.
Torque Gauge Head
JiGTH0006
AW
5.
JiGRH0002
BR
JiGSG2000
BS
JiGSG0300
BF
6.
7.
JiGADP003
BK
2.
Torque Gauge
Tension Gauge
These Jigs are used for checking
and adjusting the reel disk height.
and adjusting the reel disk height.
When fixing any part to the threaded
hole using resin with screw, use the
jig. (Specified torque 5 kg)
hole using resin with screw, use the
jig. (Specified torque 5 kg)
This cassette torque meter is used for check-
ing and adjusting the torque of take-up for
measuring tape back tension.
ing and adjusting the torque of take-up for
measuring tape back tension.
These Jigs are used for checking
and adjusting the torque of take-up
and supply reel disks.
and adjusting the torque of take-up
and supply reel disks.
Master Plane Jig and
Reel Disk Height
Adjusting Jig
Reel Disk Height
Adjusting Jig
Pinch pressing force
measuring jig
measuring jig
This Jig is used with the tension
gauge. Rotary transformer clearance
adjusting jig.
gauge. Rotary transformer clearance
adjusting jig.
There are two gauges used for the
tension measurements, 300 g and
2.0kg.
tension measurements, 300 g and
2.0kg.
4.
Torque Driver
JiGTD1200
CB
9.
JiGDRiVER11055
AR
Reverse guide height
adjusting box driver
adjusting box driver
This Jig is used for height adjustment of the
reverse guide (for reverse guide height ad-
justment).
reverse guide (for reverse guide height ad-
justment).
Guide roller height
adjustment drive
adjustment drive
This screwdriver is used for adjusting the
guide roller height.
guide roller height.
For X value adjustment
X value adjustment
gear type screw driver
gear type screw driver
This Jig is used for height
adjustment of the reverse guide.
adjustment of the reverse guide.
13.
JiGRVGH-F18
BU
12.
JiGDRiVER-6
BM
Reverse Guide Height
Adjusting Jig
Adjusting Jig
11.
JiGDRiVERH-4
AP
Video
Audio
Track
625 Monoscope
6kHz
35
µ
m
625 Monoscope
6kHz
and
and
49
µ
m
Colour bar
1kHz
VROUBZFS
VROCPSV
10. Alignment Tape
CK
10
VC-S2000HM
Video head cleaning procedure
1. Apply one drop of cleaning liquid to the cleaning paper with the baby oiler.
2. Gently press the cleaning paper against the video head to fix your finger, and move the upper drum so that each head
1. Apply one drop of cleaning liquid to the cleaning paper with the baby oiler.
2. Gently press the cleaning paper against the video head to fix your finger, and move the upper drum so that each head
is passed to and from 5 times (do not move the cleaning paper).
3. Wipe with the dry cleaning paper.
Notes :
• Use the commercially available ethanol of Class 1 as
• Use the commercially available ethanol of Class 1 as
cleaning liquid.
• Since the video head may be damaged, do not move up
and down the cleaning paper.
• Whenever the video head is cleaned, replace the clean-
ing paper.
• Do not apply this procedure for the parts other than the
video head.
Parts Code
Description
Code
ZPAPRA56-001E
Cleaning Paper
AW
ZOiLR-02-24TE
Babe Oiler (Spoit)
AH
NOTE : Part replacement. : Cleaning : Apply grease
<Specified> Cleaning liquid Industrial ethyl alcohol
<Specified> Cleaning liquid Industrial ethyl alcohol
* This mechanism does not need electric adjustment with variable resistor. Check parts. If any deviation is found,
clean or replace parts.
Maintained
Parts
Remarks
500
hrs.
hrs.
1000
hrs.
hrs.
1500
hrs.
hrs.
2000
hrs.
hrs.
Possible symptom
encountered
Guide roller ass’y
Sup guide shaft
Reverse guide
Slant pole on pole base
Full erase head
A/C head
Upper and lower drum ass’y
Capstan D.D. motor
Pinch roller
Reel belt
Tension band ass’y
Loading motor
Idler ass’y
Limiter pulley
Supply/take-up main brake levers
AHC (Automatic Head Cleaner)
color and beating
Small sound or sound
distortion
distortion
Poor S/N ratio, no color
Poor flatness of the
envelope with alignment
tape
Poor flatness of the
envelope with alignment
tape
No tape running,
uneven color
No tape running, tape
slack
No tape running, tape
slack, no fast forward/
rewind motion
uneven color
No tape running, tape
slack
No tape running, tape
slack, no fast forward/
rewind motion
Lateral noises Head
occasionally blocked
occasionally blocked
Abnormal rotation or significant
vibration requires replacement.
vibration requires replacement.
Clean tape contact part with the
specified cleaning liquid.
specified cleaning liquid.
Clean tape contact area with the
specified cleaning liquid.
specified cleaning liquid.
Clean rubber and rubber contact
area with the specified cleaning
liquid.
area with the specified cleaning
liquid.
Replace the roller of the cleaner
when it wears down.
Just change the AHC roller
assembly for new one.
when it wears down.
Just change the AHC roller
assembly for new one.
Screen swaying
Cassette not loaded or
unloaded
unloaded
No tape running, tape
slack
slack
Tape slack
MAINTENANCE CHECK ITEMS AND EXECUTION TIME
Perform the maintenance with the regular intervals as follows so as to maintain the quality of machine.
Gently press the cleaning paper to
fix with your finger, and rotate the
upper drum to clean.
Move to and from 5 times for each head.
(Do not move the cleaning paper.)
fix with your finger, and rotate the
upper drum to clean.
Move to and from 5 times for each head.
(Do not move the cleaning paper.)
Rotate the upper drum
with one hand.
with one hand.
11
VC-S2000HM
Figure 4-1.
• Reassembly
1. Before installing the cassette housing control, short-
1. Before installing the cassette housing control, short-
circuit TP801 provided at the center (when facing to the
main PWB), press the eject button. The casecon drive
gear turns and stops when the positioning mark ap-
pears. Engage two teeth of casecon drive gear with the
three teeth of casecon drive angle gear, and set on the
mechanism chassis as shown below.
main PWB), press the eject button. The casecon drive
gear turns and stops when the positioning mark ap-
pears. Engage two teeth of casecon drive gear with the
three teeth of casecon drive angle gear, and set on the
mechanism chassis as shown below.
Figure 4-2.
2. Install in the reverse order of removal.
Notes:
1. When fitting the S/E sensor holder to the cassette
1. When fitting the S/E sensor holder to the cassette
controller frame L/R, take care.
2. Misengagement of teeth of casecon drive gear and drive
angle gear causes malfunction. (The cassette cannot be
set, load and ejection are repeated).
set, load and ejection are repeated).
3. In the case when you use the magnet screw driver, never
approach the magnet driver to the A/C head, FE head,
and drum.
and drum.
4. When installing or removing, take care so that the
cassette housing control and tool do not contact the
guide pin or drum.
guide pin or drum.
5. After installing the cassette housing control once per-
form cassette loading operation.
TO RUN A TAPE WITHOUT THE CASSETTE
HOUSING CONTROL ASSEMBLY
HOUSING CONTROL ASSEMBLY
1. Remove the full-surface panel.
2. Short-circuit TP801.
3. Plug in the power cord.
4. Turn off the power switch.
2. Short-circuit TP801.
3. Plug in the power cord.
4. Turn off the power switch.
(The pole bases move into U.L.position.)
5. Open the lid of a cassette tape by hand.
6. Hold the lid with two pieces of vinyl tape.
7. Set the cassette tape in the mechanism chassis.
8. Stabilize the cassette tape with a weight (500g) to
6. Hold the lid with two pieces of vinyl tape.
7. Set the cassette tape in the mechanism chassis.
8. Stabilize the cassette tape with a weight (500g) to
prevent floating.
9. Turn on the power switch.
10. Perform running test.
10. Perform running test.
REMOVING AND INSTALLING THE CASSETTE
HOUSING
HOUSING
• Removal
1. In the cassette removing mode, remove the cassette.
2. Unplug the power cord.
3. Remove in the following numerical order.
1. In the cassette removing mode, remove the cassette.
2. Unplug the power cord.
3. Remove in the following numerical order.
a) Remove two screws
1
.
b) Slide and pull up the cassette housing control.
1
Casecon
drive gear
drive gear
Casecon drive
angle gear
angle gear
500g
Figure 4-3.
Mechanism chassis
Weight to prevent
float (500g)
float (500g)
Note:
The weight should not be more than 500g.
The weight should not be more than 500g.
To take out the cassette tape.
1. Turn off the power switch.
2. Take out the cassette tape.
1. Turn off the power switch.
2. Take out the cassette tape.
12
VC-S2000HM
REEL DISK REPLACEMENT AND HEIGHT
CHECK
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
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.
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
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.
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
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
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.
brake surface.
2. After reassembly, check the video search rewind back
tension (see page 15), and check the brake torque (see
page 17).
page 17).
• Height checking and adjustment
Note:
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.
excessive shift results in damage.
Figure 4-6.
Note:
• Check that the reel disk is lower than part A but higher
• 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.
disk height by changing the poly-slider washer under the
reel disk.
Figure 4-4.
Note:
When the tension band ass'y is pressed in the direction of
the arrow for removal, the catch is hard to be deformed.
When the tension band ass'y is pressed in the direction of
the arrow for removal, the catch is hard to be deformed.
Figure 4-5.
• Reassembly (Supply reel disk)
1. Clean the reel disk shaft and apply grease (SC-141) to
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.
of tension arm ass'y.
Tension arm ass'y
Supply reel disk
Take-up reel disk
Master plane
Reverse
guide
guide
Position
pin
pin
Take-up main brake ass'y
Supply reel disk
Cassette lock
release shaft
release shaft
Take-up reel disk
Tension band ass'y
Supply main brake ass'y
