1
VC-A560U(A)/A560U/A560U(B)
VC-H960U/H960U(B)/H961U
SUPPLEMENT
S62K7VC-A560U
SERVICE MANUAL
This document has been published to be used for
after sales service only.
The contents are subject to change without notice.
SHARP CORPORATION
VIDEO CASSETTE RECORDER
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.
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
MODELS
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).
SUPPLEMENT
VC-H961U
VC-A560U(A)/A560U/A560U(B)
VC-H960U/H960U(B)
VC-A560U(A)
VC-A560U/A560U(B)
VC-H960U/H960U(B)
VC-H961U
VC-A560U/H960U/H961U ..................................................................... Models for Canada
VC-A560U(A)/A560U/A560U(B)/H960U/H960U(B) .............................. Models for U.S.A
2
SUPPLEMENT
VC-A560U(A)/A560U/A560U(B)
VC-H960U/H960U(B)/H961U
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.
2. Removing the mechanism and cassette housing.
Remove 2 screws 3 fixing the cassette housing to the
mechanism, and remove the cassette housing.
2. DISASSEMBLY AND REASSEMBLY
MECHANISM CHASSIS
CASSETTE
HOUSING
MAIN FRAME
VC-H961U
2
3
4
3
VC-A560U(A)/A560U/A560U(B)
VC-H960U/H960U(B)/H961U
SUPPLEMENT
2-3 CARES WHEN REASSEMBLING
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.
• 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.
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.
AH CONNECTOR
AE CONNECTOR
END SENSOR
VC-H961U
END TIP SW
AA CONNECTOR
AD CONNECTOR
MODE SW
START SENSOR
AC CORD
90°
180°
270°
0°
MASTER CAM POSITION
This positioning hole
should be at front side.
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.
4
SUPPLEMENT
VC-A560U(A)/A560U/A560U(B)
VC-H960U/H960U(B)/H961U
3. FUNCTION OF MAJOR MECHANICAL PARTS (TOP VIEW)
No. Function
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
8 Take-up main brake
9 Pinch drive cam
10 A/C head ass’y
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
18 Take-up pole base ass'y
26 Auto head cleaner Ass'y
17
15 26
11
5
9
14
12
8
16
13
4
6
2
7
3
1
18
10
5
VC-A560U(A)/A560U/A560U(B)
VC-H960U/H960U(B)/H961U
SUPPLEMENT
FUNCTION OF MAJOR MECHANICAL PARTS (BOTTOM VIEW)
No. Function
No. Function
19 Syncro Gear
20 Master cam
21 Capstan D.D. motor
22 Reel belt
23 Clutch lever
24 Limiter pulley ass’y
25 Shifter
25
24
21
22
19
20
23
6
SUPPLEMENT
VC-A560U(A)/A560U/A560U(B)
VC-H960U/H960U(B)/H961U
VROATSV CD
11. JiGHMEC-M005 CK
10. JiGDRiVER-6 BM
9. JiGDRiVERH-4 AP
4. Torque Driver JiGTD1200 CB
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.
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
JiGRH0002 BR
JiGSG2000 BS
JiGSG0300 BF
7. JiGADP003 BK
Tension Gauge
These Jigs are used for checking
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)
This cassette torque meter is used for checking 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.
Master Plane Jig and
Reel Disk Height
Adjusting Jig
Pinch pressing force
measuring jig
This Jig is used with the tension
gauge. Rotary transformer clearance
adjusting jig.
There are two gauges used for the
tension measurements, 300 g and
2.0 kg.
These tapes are especially used for
electrical fine adjustment.
Video Audio HiFi Audio Track
525 Monoscope 7k — 58µm
NTSC Color Bar 1k — 58µm
VROEFZCS BG
OR
VROEFZHS BH
1k
This screwdriver is used for adjusting the
guide roller height.
For X value adjustment
This Jig is used for adjustment
of tension pole.
X value adjustment
gear driver
Tension Pole
Adjustment Driver
2.3k
Black Level
(only SYNC) signal
— 19µm
2.
Torque Gauge
6.
5.
8.
Alignment Tape
Guide roller height
adjustment driver
7
VC-A560U(A)/A560U/A560U(B)
VC-H960U/H960U(B)/H961U
SUPPLEMENT
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.
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.
Maintained
Parts
Remarks
500
hrs.
1000
hrs.
1500
hrs.
2000
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
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
Lateral noises Head
occasionally blocked
Abnormal rotation or significant
vibration requires replacement.
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.
Screen swaying
Cassette not loaded or
unloaded
No tape running, tape
slack
Tape slack
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.
• 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
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.
8
SUPPLEMENT
VC-A560U(A)/A560U/A560U(B)
VC-H960U/H960U(B)/H961U
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.
Figure 4-2.
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.
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.
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.
1
500g
Weight to prevent
float (500g)
Mechanism chassis
From Bottom View
Pinch Drive
Cam
Synchro
Gear
Master
cam
From top view
Main chassis
Drive
Lever
Phase
matching
Master cam
Line of
synchro
gear.
Hole of Pinch
drive cam.
9
VC-A560U(A)/A560U/A560U(B)
VC-H960U/H960U(B)/H961U
SUPPLEMENT
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.
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).
• 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.
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.
• 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.
Take-up reel diskSupply reel disk
Ten
Tension arm ass'y
Supply main brake
Tension band
ass'y
Take-up main brake ass'y
Supply reel disk
Take-up reel disk
Cassette lock
release shaft
Master plane
10
SUPPLEMENT
VC-A560U(A)/A560U/A560U(B)
VC-H960U/H960U(B)/H961U
Note:
Whenever replacing the reel disk, perform the height checking 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 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).
A
B
Figure 4-5.
Master plane
Reel disk height
adjusting jig
Mechanism chassis
Reel disk
10 ± 0.2mm
Reel disk
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).
Figure 4-7.
Torque gauge
25mN·m (255gf·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. 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.
Figure 4-6.
Torque gauge
25mN·m (255gf·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. 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
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