SHARP VC-H961U, VC-A560U Service Manual
SERVICE MANUAL
SUPPLEMENT
VC-A560U(A)/A560U/A560U(B)
VC-H960U/H960U(B)
VC-A560U(A)/A560U/A560U(B)
VC-H960U/H960U(B)/H961U
SUPPLEMENT
S62K7VC-A560U
VIDEO CASSETTE RECORDER
VC-A560U(A)
VC-A560U/A560U(B)
VC-H961U
MODELS
In the interests of user-safety (Required by safety regulations in some countries) the set should be restored to its
original condition and only parts identical to those specified be used.
VC-H960U/H960U(B)
VC-H961U
OUTLINE
This Supplement describes corrections of the mechanism in the VC-A560U(A)/A560U/A560U(B)/H960U/
H960U(B)/H961U Service Manual already issued. For the items which are not described in this Supplement, refer
to the VC-A560U(A)/A560U/A560U(B)/H960U/H960U(B)/H961U Service Manual (S3292VC-A560U).
CONTENTS
Page
2. DISASSEMBLY AND REASSEMBLY ........................................................................................... 2
3. FUNCTION OF MAJOR MECHANICAL PARTS........................................................................... 4
4. ADJUSTMENT, REPLACEMENT AND ASSEMBLY OF MECHANICAL UNITS .......................... 6
6. MECHANISM OPERATION FLOWCHART AND TROUBLESHOOTING GUIDE ...................... 25
VC-A560U/H960U/H961U ..................................................................... Models for Canada
VC-A560U(A)/A560U/A560U(B)/H960U/H960U(B) .............................. Models for U.S.A
SHARP CORPORATION
This document has been published to be used for
after sales service only.
The contents are subject to change without notice.
1
VC-A560U(A)/A560U/A560U(B)
VC-H960U/H960U(B)/H961U
SUPPLEMENT
2. DISASSEMBLY AND REASSEMBLY
2-2 DISASSEMBLING THE MECHANISM
1. When removing the mechanism from the set.
Remove the screw 2 which connecting the PWB and
the mechanism.
Remove the screw 4 which connecting mechanism and
main frame.
Take out vertically the mechanism so that it does not
damage the adjacent parts.
3
CASSETTE
HOUSING
VC-H961U
2. Removing the mechanism and cassette housing.
Remove 2 screws 3 fixing the cassette housing to the
mechanism, and remove the cassette housing.
4
MECHANISM CHASSIS
2
MAIN FRAME
2
2-3 CARES WHEN REASSEMBLING
VC-A560U(A)/A560U/A560U(B)
VC-H960U/H960U(B)/H961U
SUPPLEMENT
INSTALLING THE CASSETTE HOUSING
When the cassette housing is installed on the mechanism,
the initial setting is essential condition.
There are two initial setting methods, namely electrical and
mechanical.
1. Electrical initial setting
So as to perform initial setting of mechanism execute the
Step 1 of Installation of cassette housing. After ascertaining
the return to the initial setting position install the cassette
housing. (Conditions: When mechanism and PWB have
been installed)
PinchDrive Cam
Synchro Gear
Master cam
Main Chassis
Drive Lever
2. Mechanical initial setting
• Rotate the worm gear by pushing the flange manually until
return to initial position.
Rotate the flange of worm gear by using thin stick.
CW • • • Loading direction
CCW • • • Ejection direction
Note
Be careful not to damage the gear of worm gear and
worm wheel gear. It might cause a strange sound.
• When apply power supply to rotate the loading motor,
please remove/unsolder at least one terminal wire.
• If voltage applied to loading motor without disconnecting
the terminal wire, there is a possibility the capstan motor
IC will damage.
• The maximum applied voltage is 9V. If more than 9V,
there is a possibility the mechanism will damage.
• After ascertaining the return to the initial set position
install the cassette housing in the specified position.
(This method is applied only for the mechanism.)
INSTALLING THE MECHANISM ON PWB
Lower vertically the mechanism, paying attention to the
mechanism edge mode SW position, (Set the mode SW
position to 270° and make sure the master cam position
hole also in 270° position) and install the mechanism with
due care so that the parts are not damaged.
* Please make sure to insert correctly.
If not, strange moving will occur and will couse mecha-
nism damage.
END SENSOR
VC-H961U
END TIP SW
PARTS WHICH NEED PARTICULAR CARE
When installing the mechanism chassis on the PWB unit,
take care so as to prevent deformation due to contact of
mechanism chassis with REC TIP SW.
AE CONNECTOR
AH CONNECTOR
AA CONNECTOR
AD CONNECTOR
AC CORD
START SENSOR
90°
180°
0°
MASTER CAM POSITION
This positioning hole
should be at front side.
3
270°
MODE SW
VC-A560U(A)/A560U/A560U(B)
VC-H960U/H960U(B)/H961U
SUPPLEMENT
3. FUNCTION OF MAJOR MECHANICAL PARTS (TOP VIEW)
17
15 26
1
18
10
16
14
9
2
11
3
5
7
6
No. Function
1 Full erase head
2 Supply pole base ass’y
3 Tension arm
4 Idler wheel ass’y
5 Open guide
6 Supply reel disk
7 Supply main brake
12
4
13
No. Function
11 Reverse guide lever ass’y
12 Reel relay gear
13 Take-up reel disk
14 Pinch roller lever ass’y
15 Drum ass'y
16 Loading motor block
17 Drum driver motor
8
8 Take-up main brake
9 Pinch drive cam
10 A/C head ass’y
18 Take-up pole base ass'y
26 Auto head cleaner Ass'y
4
FUNCTION OF MAJOR MECHANICAL PARTS (BOTTOM VIEW)
21
22
VC-A560U(A)/A560U/A560U(B)
VC-H960U/H960U(B)/H961U
SUPPLEMENT
19
20
23
25
24
No. Function
19 Syncro Gear
20 Master cam
21 Capstan D.D. motor
22 Reel belt
No. Function
23 Clutch lever
24 Limiter pulley ass’y
25 Shifter
5
VC-A560U(A)/A560U/A560U(B)
VC-H960U/H960U(B)/H961U
SUPPLEMENT
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.
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.
No. Jig ltem Part No. Code Configuration Remarks
This cassette torque meter is used for check-
1. Torque Cassette Meter JiGVHT-063 CZ
JiGTG0090 CM
2.
Torque Gauge
JiGTG1200 CN
3. Torque Gauge Head JiGTH0006 AW
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.
4. Torque Driver JiGTD1200 CB
Master Plane Jig and
Reel Disk Height
5.
Adjusting Jig
JiGRH0002 BR
JiGMP0001 BY
JiGSG2000 BS
Tension Gauge
6.
JiGSG0300 BF
Pinch pressing force
7. JiGADP003 BK
measuring jig
8.
Alignment Tape
VROATSV CD
VROEFZCS BG
OR
VROEFZHS BH
Guide roller height
9. JiGDRiVERH-4 AP
adjustment driver
X value adjustment
10. JiGDRiVER-6 BM
gear driver
Tension Pole
11. JiGHMEC-M005 CK
Adjustment Driver
When fixing any part to the threaded
hole using resin with screw, use the
jig. (Specified torque 5 kg)
These Jigs are used for checking
and adjusting the reel disk height.
There are two gauges used for the
tension measurements, 300 g and
2.0 kg.
This Jig is used with the tension
gauge. Rotary transformer clearance
adjusting jig.
These tapes are especially used for
electrical fine adjustment.
Video Audio HiFi Audio Track
525 Monoscope 7k — 58µm
NTSC Color Bar 1k — 58µm
Black Level
(only SYNC) signal
This screwdriver is used for adjusting the
guide roller height.
For X value adjustment
1k
— 19µm
2.3k
This Jig is used for adjustment
of tension pole.
6
VC-A560U(A)/A560U/A560U(B)
VC-H960U/H960U(B)/H961U
4-2 MAINTENANCE CHECK ITEMS AND EXECUTION TIME
Perform the maintenance with the regular intervals as follows so as to maintain the quality of machine.
Possible symptom
encountered
Remarks
Abnormal rotation or significant
vibration requires replacement.
Parts
Guide roller ass’y
Maintained
500
hrs.
1000
hrs.
1500
hrs.
2000
hrs.
SUPPLEMENT
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
Lateral noises Head
occasionally blocked
Colour and beating
Small sound or sound
distortion
Poor S/N ratio, no colour
Poor flatness of the
envelope with alignment
tape
No tape running,
uneven colour
No tape running, tape
slack
No tape running, tape
slack, no fast forward/
rewind motion
Screen swaying
Cassette not loaded or
unloaded
No tape running, tape
slack
Clean tape contact part with the
specified cleaning liquid.
Clean tape contact area with the
specified cleaning liquid.
Clean rubber and rubber contact
area with the specified cleaning
liquid.
Supply/take-up main brake levers
Tape slack
NOTE : Part replacement. : Cleaning : Apply grease
<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.
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
is passed to and fro 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
cleaning liquid.
• Since the video head may be damaged, do not move up
and down the cleaning paper.
Gently press the cleaning paper to
fix with your finger, and rotate the
upper drum to clean.
Move to and fro 5 times for each head.
(Do not move the cleaning paper.)
Rotate the upper drum
with one hand.
• Whenever the video head is cleaned, replace the cleaning 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
7
VC-A560U(A)/A560U/A560U(B)
VC-H960U/H960U(B)/H961U
SUPPLEMENT
4-3 REMOVING AND INSTALLING THE CAS-
SETTE HOUSING
• Removal
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) Pull and circle the drive lever and pull up the cassette
housing control.
1
2. Install in the reverse order of removal.
Notes
1. In the case when you use the magnet screw driver, never
approach the magnet driver to the A/C head, FE head,
and drum.
2. When installing or removing, take care so that the
cassette housing control and tool do not contact the
guide pin or drum.
3. After installing the cassette housing control once perform cassette loading operation.
4-4 TO RUN A TAPE WITHOUT THE CASSETTE
HOUSING CONTROL ASSEMBLY
1. Remove the full-surface panel.
2. Short-circuit between TP803 and TP802.
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
prevent floating.
Figure 4-1.
• Reassembly
1. Before installing the cassette housing control, shortcircuit between TP803 and TP802 provided at main
PWB, press the eject button. The master cam turns and
stop in eject position. Fit the drive lever to master cam
through main chassis, push down and slide the drive
lever towards to master cam.
*Eject position: Pinch Drive Cam positioning hole parallel to center of Synchro Gear (Synchro gear marking
line). Synchro Gear positioning mark parallel to center
of master cam.
Pinch Drive
Cam
Synchro
Gear
Master
cam
Main chassis
Phase
matching
Hole of Pinch
drive cam.
Line of
synchro
gear.
Master cam
500g
Mechanism chassis
Weight to prevent
float (500g)
Figure 4-3.
9. Turn on the power switch.
10. Perform running test.
Note:
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.
Drive
Lever
From top view
From Bottom View
Figure 4-2.
8
4-5 REEL DISK REPLACEMENT AND HEIGHT
CHECK
• Removal
1. Remove the cassette housing control assembly.
2. Remove the Supply/Take-up main brake ass'y.
3. Remove tension band from the tension arm ass'y.
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
Tension band
ass'y
Supply main brake
Take-up main brake ass'y
VC-A560U(A)/A560U/A560U(B)
VC-H960U/H960U(B)/H961U
SUPPLEMENT
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 4-10), and check the brake torque (see 4-
14).
Take-up reel diskSupply reel disk
• 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 hook to tension arm
ass'y.
4. Assemble the Supply main brake ass'y.
• 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.
Master plane
Supply reel disk
Cassette lock
release shaft
Take-up reel disk
Figure 4-4.
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.
9
VC-A560U(A)/A560U/A560U(B)
VC-H960U/H960U(B)/H961U
SUPPLEMENT
Note:
Whenever replacing the reel disk, perform the height checking and adjustment.
Master plane
10 ± 0.2mm
Reel disk
Reel disk
Reel disk height
adjusting jig
Mechanism chassis
A
B
Figure 4-5.
4-6 CHECKING AND ADJUSTMENT OF TAKE-
UP TORQUE IN FAST FORWARD MODE
• Remove the cassette housing control assembly.
• After short-circuiting between TP803 and TP802
provided at operation 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
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 25mN·m (255gf·cm).
Torque gauge
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 longtime measurement.
4-7 CHECKING AND ADJUSTMENT OF TAKE-
UP TORQUE IN REWIND MODE
• Remove the cassette housing control assembly.
• After short-circuiting between TP803 and TP802
provided at operation PWB, plug in the power cord.
• 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 25mN·m (255gf·cm).
Torque gauge
25mN·m (255gf·cm)
or more
CCW
The gauge is held at
its maximum value.
(Red mark)
25mN·m (255gf·cm)
or more
Idler ass'y
CW
The gauge is held at
its maximum value.
(Red mark)
Figure 4-6.
• Adjustment
1. If the FF winding-up torque is less than the specified
value, clean the capstan D.D. 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.
Supply reel disk
Idler ass'y
Figure 4-7.
• Adjustment
1. If the rewind winding-up torque is less than the specified
value, clean the capstan D.D. pulley, reel 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.
10
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