Sharp VC-A560UA, VC-A560UB, VC-H960U, VC-H960UB, VC-H961U Service Manual

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Page 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

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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

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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.

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SUPPLEMENT

VC-A560U(A)/A560U/A560U(B) VC-H960U/H960U(B)/H961U

3. FUNCTION OF MAJOR MECHANICAL PARTS (TOP VIEW)

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

15 26



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VC-A560U(A)/A560U/A560U(B) VC-H960U/H960U(B)/H961U

SUPPLEMENT

FUNCTION OF MAJOR MECHANICAL PARTS (BOTTOM VIEW)

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



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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

VROEFZHS BH

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

Torque Gauge

Alignment Tape

Guide roller height adjustment driver

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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.

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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.

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.

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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

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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).

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

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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 longtime 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 rotation 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

+20 –25

500g

Cassette torque meter

Page 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

* Checking can be perform with or without cassette

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 CHECKING THE VIDEO SEARCH REWIND

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

* Checking can be perform with or without cassette

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)

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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

* Checking can be perform with or without cassette

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.

Tension pole adjustment driver

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

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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 the brake torque at the supply side and the 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

CCW CW

Supply reel disk

Torque gauge

CCW

Take-up reel disk

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

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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 1 so 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 REPLACEMENT OF A/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 1 is 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

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

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VC-A560U(A)/A560U/A560U(B) VC-H960U/H960U(B)/H961U

4-17 ADJUSTMENT OF TAPE DRIVE TRAIN

1. Tape run rough adjustment 1 Check and adjust the position of the tension pole.

(See 4-12.)

2 Check and adjust the video search rewind back

tension. (See 4-10.)

3 Connect 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).

4 Set the alignment tape (VROATSV) to play.

Figure 4-26.

5 Press 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.

6 Unless 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.)

7 Turn 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)

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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 adjustment is facilitated.

2. Especially the outlet side ATR signal waveform must have higher flatness.

2. Adjustment of A/C head height and azimuth 1 Perform the initial setting of A/C head position by the

method stated in "4-15 Replacement 3".

2 Connect the oscilloscope to the audio output termi-

nal.

3 Using the alignment tape in which 1 kHz linear audio

signal has been recorded, adjust the height screw so as to get max audio output.

4 Using the alignment tape in which 7 kHz linear audio

signal has been recorded, adjust the azimuth screw so as to get max audio output.

5 The adjustment of 3 and 4 twice or three times

repeat, and finally adjust 4.

Figure 4-27.

For X value adjustment Adjust the X value, turning the geartype screwdriver.

Figure 4-28.

3. Tape run adjustment 1 Connect the oscilloscope to PB ATR signal output

test point, set oscilloscope sync to EXT, trigger-input the PB CHROMA signal (head switching pulse).

2 Rough adjustment of X value

Tentatively fix A/C head arm screws 1 by the method 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 Figure 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.)

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3 Next, 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 waveform changes nearly parallel.

4 If the tape is lifted or sunk from the helical lead

surface, the PB ATR signal waveform appears as shown in Figure 4-30.

5 Press the tracking button (+), (–) and make sure that

the ATR signal waveform changes nearly parallel.

6 Finally, 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.

3 Move 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.)

4 Adjust the playback switching point (Refer to the

electric adjustment method.)

5 Playback 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 1 Fix A/C head arm screws 1 by the method described

in 4-15 "Replacement 3".

2 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.

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 counterclockwise 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 counterclockwise 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.

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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 mechanism 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.

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

1 Reel belt

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4-21 ASSEMBLING OF PHASE MATCHING

MECHANISM COMPONENTS

• Assemble the phase matching mechanism components 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 mechanism 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)

1 Remove the motor as stated in 4-19 D.D. motor replace-

ment.

2 Remove the drum earth brush ass’y 2. 3 Remove the upper and lower drum assembly from main

chassis 1.

4 Remove 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 assembly, 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.

Lower drum bottom side

Dot B

Dot A

Insert it into the groove of the shaft

Don't run up on the spring

Synchro gear

From Top View

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Figure 4-37.

4-22 INSTALLING THE SHIFTER

Figure 4-36.

1. Make sure that the loading arm T and S are at the PhaseMatching point as shown below .

2. Fix the shifter position setting part to the roading arm T position setting part as shown in figure .

3. Make sure tension arm not run on the shifter as shown in figure .

Loading arm (T)

Shifter

Insert point

Loading arm (T)

Loading arm (S)

Phase matting

*Not run on the

sifter.

Sifter

Tension arm

Drum

Capstan D.D. motor

(Bottom side of mechanism chassis)

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VC-A560U(A)/A560U/A560U(B) VC-H960U/H960U(B)/H961U

4-23 INSTALLING THE MASTER CAM (AT

REAR SIDE OF MECHANISM CHASSIS)

1. Make sure beforehand that the shifter is at initial position. (Right side from bottom view)

2. Place the master cam in the position as shown below.

3. Fix the E ring.

Note:

See the figure below for the phase matching between the master cam synchro gear and pinch drive cam.

4-24 REPLACEMENT OF LOADING MOTOR

• Removal

• Replacement

Remove the loading motor, and install the replacement loading motor as shown below.

Figure 4-40.

Figure 4-38-2.

The loading motor pressing-in must be less than 196N (20 kgf). Adjust the distance between motor and pulley to 6.95 mm.

Figure 4-38-1.

Figure 4-39.

+0. 2

–0.15

E-ring

6.95 mm

A part

Worm gear

-0.15

Loading motor

To press the motor in, first receive it by portion A.

Apply grease

Worm gear

Apply grease

L-M-Block.

Worm wheel gear.

Leading connect gear.

*Apply grease to

the tip as well.

motor.

Wire + : Red

- : White

Red

Insert

4. Adjust the master cam and pinch drive cam, fix the synchro gear in correct position.

Pinch Drive Cam

Synchro gear

Phase matching

Hole of Pinch Drive Cam

Master Cam

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4-25 ASSEMBLY OF CASSETTE HOUSING

1. Proof lever Proof lever spring and Holder R

Figure 4-41.

MSPRD0215AJFJ

*Proof lever spring fixing direction designated.

MSPRD0212AJFJ

Take care not to damage this part

Outside

Outer

Top

Bottom

Inner

2. Open lever, Sensor Plate and Drive Lever to Frame R

3. Spring to Drive Arm R

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VC-A560U(A)/A560U/A560U(B) VC-H960U/H960U(B)/H961U

LANGF9661AJFW

Top surface should be free from scratches or soil.

When assemble drive lever to frame R, make sure the hole synchronize.

4. Frame R, Frame L, Drive Arm R, Drive Arm L, Upper Plate.

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Loading motor turns in reverse

direction and master cam

clockwise.

CASSETTE INSERTION STOP

Cassette

inserting

Full-

YES

Loading motor starts in forward

direction and master cam counter

clockwise.

Does mechanism position sw.

come off within 2.5 sec.?

Are start/end sensors at low level

before cassette insertion ?

Insert cassette.

Drum motor starts.

Tape loading.

Pinch roller comes into contact.

Mode switch is at PB position.

Loading motor stop.

Unloading

Is drum FG pulse outputted ?

End

Cassette is ejected and loading

motor stops.

Start sensor close.

(Cassette is judged

caught halfway.)

(Cassette LED or some other part

is judged defective.)

6. MECHANISM OPERATION FLOWCHART AND TROUBLESHOOTING GUIDE

MECHANISM OPERATION FLOWCHART

* This flowchart describes the outline of the mechanism’s operation, but does not give its details.

S Sensor

Open

CS/EJ

ULD

PU1

PU2

VSR

SLOW

STOP

Code 1

Code 2

S Sensor

Code 2

Code 1

Mecha Mode

H Mechanical Timing

Mode check

Cam mark

Code 1

Code 2

EJ UL PU PU2 VSR PB SLW FF STP

1 or 0

120 180 240 300 360

CS/EJ



UL



PU1



PU2



VSR



PB



STILL

SLOW



REW

FF



STOP



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STOP REC/PLAY

PLAY STILL

PLAY VSR

VSR PLAY

Capstan motor turns

counterclockwise.

Is take-up reel sensor signal

outputted ?

End

Press REC/PLAY key.

Picture appears.

Unloading

Set capstan motor to search

speed.

End

Press FF key.

PLAY VSF

REC/PLAY STOP

Capstan motor turns in

reverse direction.

Loading motor turns in

forward direction and master

cam CCW.

Slow brake comes into

contact with capstan motor.

Slow brake

pressing

Mode switch is at STILL

position.

End

Capstan motor stops.

Press STOP key.

Loading motor stops.

End

Stop capstan motor.

YES

Press STILL key.

Pinch

roller

releasing

Idler

swinging

Pinch

roller

pressing

Loading motor turns reverse

direction and master cam

clockwise.

Turn capstan motor in

reverse direction.

Turn loading motor forward

direction.

Mode switch is at VSR

position.

Set capstan motor to search

speed.

Is take-up reel sensor signal

outputted ?

Press REW key.

Release pinch roller.

Mode switch is at PU2 position.

Mode switch is at PU1 position.

Stop loading motor.

Press pinch roller.

Loading motor turns reverse

direction

Release the supply main

brake.

Stop loading motor.

End

Unloading

Mode switch is at PB position.

End

Press PLAY Key.

Loading motor turns forward

direction and master cam

CCW.

Capstan motor turns

counterclockwise. PB speed.

YES

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STOP FF/REW

STOP CASSETTE EJECT

FF/REW STOP

FF/REW

operation

Brake

function

Turn capstan motor in

normal or reverse direction,

after the remaining tape has

been detected.

Loading motor turns forward

direction.

Mode switch is at Stop

position.

End

Press STOP key.

Press FF/REW key.

Stop capstan motor.

Mode SW is at FF/REW

position.

Loading motor rotate forward.

Loading Motor stop rotate.

Mode SW at PB position.

Loading motor reverse direction.

Loading Motor stop rotate.

Loading motor stops.

End

Loading motor turns in reverse direction and master cam

clockwise.

4 supply reel pulses

outputted ?

Does the take-up

reel pulse output

two edges ?

Capstan motor turns

clockwise.

Loading motor turns

reverse direction.

Mode switch is at

Eject position.

Loading motor

stops.

Capstan motor

stops.

Press EJECT key.

Tape

unloading

Cassette

eject

End

Capstan motor turns

clockwise.

Capstan motor turns

counterclockwise in about

2 seconds.

Stop loading motor.

Capstan motor turns in reverse direction.

Mode switch is at UL position.

YES



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MECHANISM TROUBLESHOOTING

1. FF/REW FAILURE (NO TAPE WINDING)

Press FF key.

NO NO NO

YES

YES YES

Is master cam at

FF position ?

Does loading

motor operate ?

Modes changing

smoothly through

mode switch ?

Loading motor

control system

in trouble.

Are Vco 23V and

Vcc 5V applied ?

Replace the

capstan motor.

Replace the idler

ass’y.

Replace the reel

sensor.

Is voltage applied

to loading motor ?

Loading motor is

damaged. Replace

it.

Voltage supply

system in trouble.

Mode SW in

trouble or master

cam malpositioned.

Voltage supply

system in trouble.

Does capstan

motor turn in FF (or

REW) direction ?

Are idler wheel

ass’y and reel disk

in mesh ?

Is the pulse

outputted from reel

sensor ?

The cassette tape

is presumably

damaged.

2. REC/PLAY FAILURE (MODE RELEASE)

NO NO NO

YES

YES YES

Is the master cam

at PB position ?

Does loading

motor operate ?

Modes changing

smoothly through

mode switch ?

Loading motor

control system

in trouble.

Are Vco 23V and

Vcc 5V applied ?

Replace the

capstan motor.

Replace the idler

ass’y.

Replace the reel

sensor.

Is voltage applied

to loading motor ?

Loading motor is

damaged. Replace

it.

Voltage supply

system in trouble.

Voltage supply

system in trouble.

Does capstan

motor turn ?

Are idler wheel

ass'y and reel disk

in mesh ?

Is the pulse

outputted from reel

sensor ?

Check main PWB.

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Replace loading motor block.

3. WINDING FAILURE AT VSR 4. UNUSUAL SOUND IN EACH MODE

Is Playback

function normal ?

Master cam

shifting to VSR

position ?

Go to 2. REC/

PLAY FAILURE

routine.

Replace idler

gear ass’y.

Replace limiter

pulley ass’y.

Replace reel

sensor.

Go to 2. REC/

PLAY FAILURE

routine.

Are idler wheel

ass’y and supply

reel disk in mesh ?

Is supply reel disk

winding torque

normal ?

Is pulse outputted

from reel sensor ?

Check main PWB.

YES

Press REW key.

4-i) Unusual sound in cassette

insertion and ejection mode

Is unusal sound heard during

cassette control running ?

Unusual sound heard with pinch

roller lever going up or down ?

Is unusual sound heard during

loading/unloading ?

Check pinch drive cam, pinch roller ass'y

and reverse guide for their actions.

Replace damaged one with new one.

Replace cassette control ass

’y.

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YES

Replace capstan motor.

4-ii) Unusual sound in FF/REW mode

Is reel disk height as specified ?

Thrust gap found at reel disk ?

Drive system out of contact with any

part on main PWB ?

Turn capstan motor by hand.

Unusual sound heard ?

Check drive system

’s gears for

damage. Replace damaged gear

with new one.

• Reel disk

• Limiter pulley ass

’y

• Idler gear ass’y

Check reel disk and main chassis.

And replace defective parts.

Adjust reel disk height.

Rearrange the parts on main PWB.

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SHARP CORPORATION AV Systems Group Quality & Reliability Control Center Yaita, Tochigi 329-2193, Japan

No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permission of the publisher.

D SEM P SMM TQ1283-S Mar. 2002 Printed in JAPAN

NA. DS