Sharp VC-A560UA User manual

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 2which connecting the PWB and
the mechanism.
Remove the screw 4which 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 3fixing the cassette housing to the
mechanism, and remove the cassette housing.
2. DISASSEMBLY AND REASSEMBLY
MECHANISM CHASSIS
CASSETTE
HOUSING
MAIN FRAME
VC-H961U
2
34

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)
PinchDrive 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 (BOTTOMVIEW)
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 check-
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.
Master Plane Jig and
Reel Disk Height
Adjusting Jig
Pinch pressing force
measuring jig
This Jig is used with the tension
gauge.Rotarytransformerclearance
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 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
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, short-
circuit 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 paral-
lel 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 casewhen you usethe magnet screwdriver,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 per-
form cassette loading operation.
4-4 TORUNATAPE WITHOUTTHECASSETTE
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 phasesof reel diskand reel relaygear, 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'ySupply 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:
Wheneverreplacingthe reel disk,perform the heightcheck-
ing 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 long-
time 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).
AB
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

11
VC-A560U(A)/A560U/A560U(B)
VC-H960U/H960U(B)/H961U
SUPPLEMENT
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 long-
time measurement.
4-8 CHECKING AND ADJUSTMENT OF TAKE-
UP TORQUE IN RECORD/PLAYBACK
MODE
• Remove the cassette housing control assembly.
• After short-circuiting between TP803 and TP802
provided at operation PWB, plug in the power cord.
• Turn off the power switch.
• Open the cassette torque meter lid, and fix it with
tape.
• Load the cassette torque meter into the unit.
• Put the weight (500g) on the cassette torque meter.
• Turn on the power switch.
• Press the picture record button, and set EP picture
record mode (x3).
4-9 CHECKING AND ADJUSTMENT OF TAKE-
UP TORQUE IN VIDEO SEARCH 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
Press the playback button and rewind button to set the
video search rewinding mode.
• Checking
Place the torque gauge on the supply reel disk, and turn it
counterclockwise very slowly (one rotation every 1 to 2
seconds) and check that the torque is within the set value
14.1 ±3.5mN⋅m. (144 ±35gf⋅cm)
Set value EP 6.9 mN⋅m (70 gf⋅cm)
Figure 4-8.
• Checking
1. Make sure that value is within the setting 6.9 mN·m
(70 gf·cm).
2. The winding-up torque fluctuates due to variation of
rotation torque of limiter pulley ass'y. Read the center
value of fluctuation as setting.
3. Set the EP record mode (x3) and make sure that the
winding-up torque is within setting.
• Adjustment
If the playback winding-up torque is not within the setting,
replace the limiter pulley assembly.
Note:
When the torque cassette is set, put a weight (500g) to
prevent rise.
When the cassette torque meter is taken out.
Turn off the power switch.
Figure 4-9.
Note:
Surely put the torque gauge on the reel disk to measure. If
the torque gauge is raised, accurate measurement is
impossible.
• Adjustment
If the rewinding playback winding-up torque is not within the
setting, replace the limiter pulley assembly.
Note:
The winding-up torque fluctuates due to variation of rota-
tion torque of supply reel disk. Read the center value of
fluctuation as setting.
Torque gauge
Supply reel disk
CCW
+20
–25
+2.0
–2.5
+2.0
–2.5 +20 –25
500g
Cassette torque meter

12
SUPPLEMENT
VC-A560U(A)/A560U/A560U(B)
VC-H960U/H960U(B)/H961U
Figure 4-11.
4-12 CHECKING AND ADJUSTMENT OF
TENSION POLE POSITION
* Checkingcanbeperformwithorwithoutcassette
housing contorl.
• Remove the cassette housing contorol assembly.
• After short-circuiting between TP803 and TP802
provided at main PWB, plug in the power cord.
• Setting (with cassette housing contorl)
1. Turn off the power switch.
2. Open the cassette tape (T-120), and fix with tape.
3. Set the cassette tape in loading state.
4. Put the weight (500g) on the cassette tape.
5. Turn on the power switch.
6. Make the adjustment with the beginning of a T-120 tape.
• Setting (with cassette housing contorl)
1. Insert cassette tape (T-120)
2. Make the adjustment with the beginning of a T-120
tape.
4-10 CHECKINGTHEVIDEOSEARCHREWIND
BACK TENSION
• Remove the cassette housing control assembly.
• After short-circuiting between TP803 and TP802
provided at main PWB, plug in the power cord.
• Checking
1. After pressing the play button, press the rewind button,
and set the video search rewind mode.
2. Place the torque gauge on the take-up reel disk, and turn
it counterclockwise very slowly (one rotation every 2 to
3 seconds) and check that the torque is within the set
value 3.7 ±1.5mN⋅m (38 ±15gf⋅cm).
Pinch roller Tension gauge
900 - 1,200gf
Capstan shaft
Tension gauge adapter
Figure 4-10.
Torque gauge
Take-up reel disk
Notes:
Set the torque gauge securely on the take-up reel disk.
If it is not secure, the measurement will be incorrect.
4-11 CHECKING THE PINCH ROLLER
PRESSURE
* Checkingcanbeperformwithorwithoutcassette
housing contorl.
• Remove the cassette housing control assembly.
• After short-circuiting between TP803 and TP802
provided at main PWB, plug in the power cord.
• Checking
Press the play button to set the playback mode.
1. Detach the pinch roller from the capstan shaft.
Do not separate excessively. Or the pinch lever and
pinch double action lever may disengage.
2. Engage the tension gauge adapter with the pinch roller
shaft, and pull in the arrow direction.
3. Gradually return the pinch roller, and measure the
pulling force when the pinch roller contacts the capstan
shaft.
4. Make sure that the measured value is within setting
change to 9.8 ±2N (1.0 ±0.2kgf).
CCW
Figure 4-12.
500g
Weight to prevent
float (500g)
(T-120)

13
VC-A560U(A)/A560U/A560U(B)
VC-H960U/H960U(B)/H961U
SUPPLEMENT
• Checking
1. Set a cassette tape, push the REC button to place the
unit in the SP record mode. Now check the tension pole
position.
2. Visually check to see if the position of the tension pole is
within the 0 mm from the left side line.
Insert the tension pole adjustment driver to main chassis
hole, and rotate clockwise.
Figure 4-15.
At left side from the reference line. (A).
Figure 4-13.
Figure 4-14.
Insert the tension pole adjustment driver to main chassis
hole, and rotate counterclockwise.
At right side from the reference line. (A).
Tension pole adjustment driver adjusting direction
4-13 CHECKING AND ADJUSTMENT OF
RECORD/PLAYBACK BACK TENSION
* Checkingcanbeperformwithorwithoutcassette
housing contorl.
• Remove the cassette housing contorol assembly.
• After short-circuiting between TP803 and TP802
provided at main PWB, plug in the power cord.
• Setting (with cassette housing contorl)
1. Turn off the power switch.
2. Open the cassette torque meter and fix with tape.
3. Set the cassette torque meter in loading state.
4. Put the weight (500g) on the cassette torque meter.
5. Turn on the power switch.
• Setting (with cassette housing contorl)
1. Insert cassette torque meter.
Make the adjustment with the beginning of a T-120 tape.
Figure 4-16.
Figure 4-17.
A
A
A
Tensionpole
adjustment
driver
CW
CCW
Cassette torque
meter
500g
Weight to prevent
float (500g)
Standard A = 0 mm
+ 0.5
- 0.2
• Checking
1. Push the REC button to place the unit in the SP record
mode.
2. At this time ascertain that the back tension is within the
setting 3.9 to 5.5mN⋅m (40 to 56gf·cm) by seeing the
indication of torque cassette meter.
+0.5
–0.2

14
SUPPLEMENT
VC-A560U(A)/A560U/A560U(B)
VC-H960U/H960U(B)/H961U
• Adjustment
1. If the indication of torque cassette meter is lower than
the setting, shift the tension spring engagement to the
part A.
2. If the indication of torque cassette meter is higher than
the setting, shift the tension spring engagement to the
part B.
• Checking the brake torque at the take-up side
Figure 4-20.
• Remove the cassette housing control assembly.
• After short-circuiting between TP803 and TP802
provided at main PWB, plug in the power cord.
• Setting
1. Switch from the FF mode to the STOP mode.
2. Disconnect the power cord.
3. Set a torque gauge to zero on the scale. Place it on the
take-up reel disk.
4. Please check Idler gear not contact with reel relay gear
(TU side)
• Checking
1. Turn the torque gauge at a rate of about one turn/2 sec
in the CCW direction/CW direction so that the reel disk
and torque gauge pointer rotates at equal speed and
make sure that the value is within the setting (CCW
direction: 4.41 ±1mN·m (45 ±gf·cm), CW direction:
4.12 ±1.mN·m (42 to gf·cm).
2. Adjustment of thebrake torque atthesupply side andthe
take-up side
•Unless the supply side brake torque or take-up side
brake torque is within the setting, clean the felt surface
of reel disk (supply, take-up) brake lever, check again
the brake torque.
•If value cannot be set within the setting yet, replace the
main brake ass'y or main brake spring.
Figure 4-18.
4-14 CHECKING THE BRAKE TORQUE
• Checking the brake torque at the supply side
Figure 4-19.
• Remove the cassette housing control assembly.
• After short-circuiting between TP803 and TP802
provided at main 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. Switch from the FF mode to the STOP mode.
3. Disconnect the power cord.
4. Please check Idler gear not contact with reel relay gear
(SU side)
Tension arm
Tension spring
CW
CCW CW
Supply reel disk
Torque gauge
Torque gauge
CCW
Take-up reel
disk
AB
CCW: 4.41 ±mN⋅m (45 ±gf⋅cm)
CW: 4.12 ±mN⋅m (42 ±gf⋅cm)
• Checking
Turn the torque gauge at a rate of about one turn/2 sec
in the CW direction/CCW direction with respect to the
supply reel disk so that the reel disk and torque gauge
pointer rotate at equal speed, and make sure that the
value is within the setting (CW direction: 4.12 ±mN·m
(42 gf·cm); CCW direction: 4.41 mN·m (45 15gf·cm).
+15
–12 +2.0
–1.5 +20 –15
+1.5
–1.2
CCW: 4.41 ±mN⋅m (45 ±gf⋅cm)
CW: 4.12 ±mN⋅m (42 ±gf⋅cm)
+2.0
–1.5
+1.5
–1.2
+20
–15
+15
–12
+2.0
–1.5 +20
–15
+1.5
–1.2 +15 –12
+2.0
–1.5
+1.5
–1.2
+20
–15
+15
–12

15
VC-A560U(A)/A560U/A560U(B)
VC-H960U/H960U(B)/H961U
SUPPLEMENT
Figure 4-22.
• Replacement
1. Solder the removed PWB to the new head assembly.
2. Adjust the height from the A/C head arm (lower surface)
to the A/C head plate to 10.8mm with slide calipers. (3
places of azimuth screw section, tilt screw section and A/
C head front section) (See the figure below.)
3. Align the left end of gear of A/C head arm with the
punched mark of chassis, tentatively tighten the screws
1so as to ensure smooth motion of A/C head arm.
Tightening torque must be 0.45 ±0.05N·m (4.5 ±
0.5kgf·cm).
4-15 REPLACEMENTOFA/C(AUDIO/CONTROL)
HEAD
1. In eject position unplug the power cord.
• Removal
1. Take out FFC holder from main chassis.
(Push 3 hooking point and pull-up the
holder).
2. Remove the screws 123, Tilt screw.
3. Unsolder the PWB fitted to the A/C head.
Notes:
1. When replacing, never touch the head. If you touched,
clean with the cleaning liquid.
2. When removing the screw 3, take care so that the
spring may out.
Figure 4-23.
Note:
1. If the screw 1is tighten tentatively too loose, the
azimuth and height of A/C head may change when they
are finally tightened. Therefore care must be taken.
2. After completion of A/C head be sure to adjust tape
running. (Execute the running adjustment by the method
described in 4-17.)
Figure 4-21.
Height screw
Left end of A/C head arm gear
Punched line mark on chassis
1
3
1
2
A/C head screw
Azimuth spring
Height adj. screw
A/C head PWB ass'y
(with A/E)
Tilt screw
Height Adj. spring
A/C head PWB
Azimuth adj. screw
*Derection designation.
(The bottom part is big.)
A/C head plate
10.8mm
A/C head FFC
A/C FFC holder
Solder
A/C head PWB
New A/C head ass'y
A/C head plate
*Fit the groove of FFC to
the boss of the holder.
AC Head
FFC
Holder

16
SUPPLEMENT
VC-A560U(A)/A560U/A560U(B)
VC-H960U/H960U(B)/H961U
4-17 ADJUSTMENT OF TAPE DRIVE TRAIN
1. Tape run rough adjustment
1Check and adjust the position of the tension pole.
(See 4-12.)
2Check and adjust the video search rewind back
tension. (See 4-10.)
3Connect the oscilloscope to the test point for PB ATR
signal output (TP201). Set the synchronism of the
oscilloscope to EXT. The PB ATR signal is to be
triggered by the head switching pulse (TP202).
4Set the alignment tape (VROATSV) to play.
Figure 4-26.
5Press the tracking button (+), (–) and change the
ATR signal waveform from max to min and from min
to max. At this time make sure that the ATR signal
waveform changes nearly parallel.
6Unless the ATR signal waveform changes nearly
parallel, adjust the height of supply side and take-up
side guide roller so that the envelope waveform
changes nearly parallel. (For ATR signal adjustment
procedure refer to Figure 4-30.)
7Turn the tilt screw to remove the tape crease at the
fixing guide flange.
Playback the tape and check for tape crease at the
fixing guide flange.
(1)If there is no tape crease
Turn the tilt screw clockwise so that tape crease
appears once at the flange, and then return the tilt
screw so that the crease disappears.
(2)If there is tape crease
Turn counterclockwise the tilt screw so that the
tape crease disappears.
(Reference) If the tilt screw is turned clockwise
crease appears at the lower flange.
Guide roller
Cassette Tape
Figure 4-24.
Figure 4-25.
Tape
0.3mm
A/C head
• Adjustment
Adjust the height screw visually so that the control head is
visible 0.3mm below the bottom of the tape.
1. Set the cassette tape in the unit.
2. Press the PLAY button to put the unit in the playback
mode.
3. Roughly adjust the height of the A/C head by turning the
height screw until the tape is in the position shown
below.
4-16 A/C HEAD HEIGHT ROUGH ADJUSTMENT
• Setting
Mechanism chassis
Cassette tape
Height screw
TiH screw
Azimuth screw
500g
Weight to prevent
float (500g)

17
VC-A560U(A)/A560U/A560U(B)
VC-H960U/H960U(B)/H961U
SUPPLEMENT
Notes:
1. Previously set the tracking control in the center position,
and adjust the ATR signal waveform to maximum with X
value adjustment nut. Thereby the tape run rough ad-
justment is facilitated.
2. Especially the outlet side ATR signal waveform must
have higher flatness.
2. Adjustment of A/C head height and azimuth
1Perform the initial setting of A/C head position by the
method stated in "4-15 Replacement 3".
2Connect the oscilloscope to the audio output termi-
nal.
3Using the alignment tape in which 1 kHz linear audio
signal has been recorded, adjust the height screw so
as to get max audio output.
4Using the alignment tape in which 7 kHz linear audio
signal has been recorded, adjust the azimuth screw
so as to get max audio output.
5The adjustment of 3and 4twice or three times
repeat,andfinally adjust4.
Figure 4-27.
For X value adjustment
Adjust the X value, turning the gear-
type screwdriver.
Figure 4-28.
3. Tape run adjustment
1Connect the oscilloscope to PB ATR signal output
test point, set oscilloscope sync to EXT, trigger-input
the PB CHROMA signal (head switching pulse).
2Rough adjustment of X value
Tentativelyfix A/C headarm screws1by themethod
described in 4-15 "Replacement 3".
Playback the alignment tape (VROATSV) and
shortcircuit between TP801 and TP802. As a result
the auto-tracking is automatically cancelled, so that
the X value adjustment mode is set.
Move the A/C head with the X value adjustment gear
driver (JiGDRiVER-6) by the method shown in Fig-
ure 4-33, and adjust the A/C head so as to get the
maximum ATR signal waveform. (Note: When the A/
C head is adjusted, adjust so that the maximum ATR
signal waveform is obtained nearest the position of
initial setting made in 4-15.)

18
SUPPLEMENT
VC-A560U(A)/A560U/A560U(B)
VC-H960U/H960U(B)/H961U
3Next, press the tracking button (+), (–) and change
the ATR signal waveform from max to min and from
min to max. At this time adjust the height of supply
and take-up side guide roller with the adjustment
driver (JiGDRiVERH-4) so that the ATR signal wave-
form changes nearly parallel.
4If the tape is lifted or sunk from the helical lead
surface, the PB ATR signal waveform appears as
shown in Figure 4-30.
5Press the tracking button (+), (–) and make sure that
the ATR signal waveform changes nearly parallel.
6Finally, check tape crease near the reverse guide. If
tape crease is found, adjust tilt screw 45˚counter
clockwise. Small tape crcase will appear at retain
guide after this adjustment finished.
3Move the A/C head with the X value adjustment gear
driver by the method shown in Figure 4-33, and
adjust the A/C head so as to get the maximum ATR
signal waveform. (Note: At this time adjust so as to
get the maximum ATR signal waveform nearest the
A/C head position which has been set in case of X
value rough adjustment as stated in 4-17, 3- 2.)
4Adjust the playback switching point (Refer to the
electric adjustment method.)
5Playback the self-picture-recorded tape, and check
the flatness of ATR signal waveform and sound.
Notes:
When the A/C head X value adjustment is performed, be
sure to perform at first X value rough adjustment (refer to 4-
17, 3-2).
PB ATR
Signal
Head switching pulse
Figure 4-29.
4. A/C head X value adjustment
1Fix A/C head arm screws 1by the method described
in 4-15 "Replacement 3".
2Playback the alignment tape (VROATSV), and
shortcircuit between TP801 and TP802. As a result
the auto-tracking is automatically cancelled, so that
the X value adjustment mode is set.
Take-up side Supply side Take-up side
Adjustment
Supply side
Supply side guide roller
rotated in clockwise
direction (lowers guide
roller) to flatten
ATR signal.
Take-up side guide roller
rotated in clockwise
direction (lowers guide
roller) to flatten
ATR signal.
Supply side guide roller
rotated in counterclock-
wise direction (raises
guide roller) to make the
tape float above the helical
lead. The supply
side guide roller is then
rotated in the clockwise
direction to flatten the
ATR signal.
Take-up side guide roller
rotated in counterclock-
wise direction (raises
guide roller) to make the
tape float above the
helical lead. The take-up
side guide roller is then
rotated in the clockwise
direction to flatten the
ATR signal.
Figure 4-30.
When the tape is below the helical lead.When the tape is above the helical lead.
Figure 4-31.
1

19
VC-A560U(A)/A560U/A560U(B)
VC-H960U/H960U(B)/H961U
SUPPLEMENT
4-19 REPLACEMENT OF DRUM D.D. MOTOR
1. Set the ejection mode.
2. Withdraw the main power plug from the socket.
• Removal (Perform in numerical order.)
1. Disconnect the FFC cable 1.
2. Unscrew the D.D. stator assembly fixing screws 2.
3. Take out the D.D. stator assembly 3.
4. Unscrew the D.D. rotor assembly fixing screws 4.
5. Take out the D.D. rotor assembly 5.
Notes:
1. In removing the D.D. stator assembly, part of the drum
earth spring pops out of the pre-load collar.
Be careful not to lose it.
2. Install, so that the D.D. rotor ass'y and upper drum ass'y
mounting direction check holes align.
(Align the upper drum dent with the rotor hole.)
3. Be careful not to damage the upper drum or the video
head.
4. Protect the hole elements from shock due to contact with
D.D. stator or D.D. rotor ass'y.
5. After installation adjust the playback switching point for
adjustment of servo circuit.
4-18 REPLACEMENT OF THE CAPSTAN D.D.
(DIRECT DRIVE) MOTOR
•Remove the mechanism from the set.
• Removal (Follow the order of indicated numbers.)
1. Unsolder loading motor wire and drum FFC.
2. Remove the reel belt 1.
3. Remove the three screws 2.
• Reassembly
1. Taking care so that the capstan shaft does not contact
the mechanism chassis, set its position on the mecha-
nism chassis, and then install with the three screws.
2. Install the reel belt.
3. Solder loading motor wire and drum FFC.
Notes:
1. After installing the capstan D.D. motor, be sure to rotate
the capstan D.D. motor and check the movement.
2. Set the tape, and check for the tape crease near the
reverse guide in the playback mode. Adjust the A/C
head and azimuth as stated in 4-17 item 2.
Figure 4-33.
Figure 4-32.
2
21
4
5
4
D.D. rotor ass'y
D.D.stator ass'y
Upper drum
FFC
Main chassis
Solder drum FFC
Solder loading
motor wire
Capstan
D.D. motor
2
1Reel belt

20
SUPPLEMENT
VC-A560U(A)/A560U/A560U(B)
VC-H960U/H960U(B)/H961U
4-21 ASSEMBLING OF PHASE MATCHING
MECHANISM COMPONENTS
• Assemble the phase matching mechanism compo-
nents in the following order.
1. Assemble the reverse guide lever and pinch drive cam.
2. Mounting the shifter (on the back of the mechanism
chassis).
3. Mounting the master cam (on the back of the mecha-
nism chassis).
4. Assemble synchro gear.
5. Assemble the loading motor parts.
• PINCH DRIVE CAM AND REVERSE GUIDE
LEVER ASSEMBLING METHOD.
(Place the following parts in position in numerical order.)
(1)Pinch drive cam 1
(2)Reverse guide spring 2
(3)Reverse guide lever ass’y 3
(4)Open guide 4
4-20 REPLACING THE UPPER AND LOWER
DRUM ASSEMBLY
•Replacement (Perform in the numerical order)
1Remove the motor as stated in 4-19 D.D. motor replace-
ment.
2Remove the drum earth brush ass’y 2.
3Remove the upper and lower drum assembly from main
chassis 1.
4Remove the drum FFC holder 3.
[Cares when replacing the drum]
1. Be careful so that the drum earth brush is not lost.
2. Do not touch directly the drum surface.
3. Fit gently the screwdriver to the screws.
4. Since the drum assembly is an extremely precise as-
sembly, it must be handled with utmost care.
5. Make sure that the drum surface is free from dust, dirt
and foreign substances.
6. After replacing the drum be sure to perform the tape
running adjustment.
After that, perform also the electrical adjustment.
•Playback switching point adjustment
•X-position adjustment and check
•Standard and x-3 slow tracking adjustment
7. After replacing the drum clean the drum.
Figure 4-34.
Figure 4-35.
2
1
3
Lower drum bottom side
4
2
3
1
Dot B
Dot A
Insert it into the
groove of the shaft
Don't run up
on the spring
1
3
2Synchro gear
From Top View