Sharp VC-TA350 Manuel utilisateur

VC-TA350/TA351/351W

VC-TA352W/TA355/TA356

VIDEO CASSETTE RECORDER

SERVICEMANUAL

CONTENTS

Page

1. SPECIFICATIONS................................................................................................................. 3

2. DISASSEMBLY AND REASSEMBLY ................................................................................... 4

3. FUNCTION OF MAJOR MECHANICAL PARTS................................................................... 7

4. ADJUSTMENT, REPLACEMENT AND ASSEMBLY OF MECHANICAL UNITS.................. 9

5. ELECTRICAL ADJUSTMENT ............................................................................................. 28

6. MECHANISM OPERATION FLOWCHART AND TROUBLESHOOTING GUIDE .............. 31

7. TROUBLESHOOTING ........................................................................................................ 37

8. BLOCK DIAGRAM............................................................................................................... 48

9. SCHEMATIC DIAGRAM AND PWB FOIL PATTERN......................................................... 56

10. REPLACEMENT PARTS LIST ............................................................................................ 68

11. EXPLODED VIEW............................................................................................................... 75

12. PACKING OF THE SET ...................................................................................................... 79

SHARP CORPORATION

VC-TA352W Only

Intheinterestsofuser-safety(Requiredbysafetyregulationsinsome

countries)the setshould berestoredto itsoriginal conditionandonly

parts identical to those specified be used.

MODELS

VC-TA350

VC-TA351

VC-TA351W

VC-TA352W

VC-TA355

VC-TA356

S70E1VC-TA350

VC-TA350/TA351/351W

VC-TA352W/TA355/TA356

PRECAUTIONS IN PART REPLACEMENT

When servicing the unit with power on, be careful to the section marked white all over.

This is the primary power circuit which is live.

When checking the soldering side in the tape travel mode, make sure first that the tape has been loaded and then turn

over the PWB with due care to the primary power circuit.

Make readjustment, if needed after replacement of part, with the mechanism and its PWB in position in the main frame.

(1) Start and end sensors: Q701 and Q702

Insert the sensor’s projection deep into the upper hole of the holder. Referring to the PWB, fix the sensors tight

enough.

(2) Photocoupler: IC902

Refer to the symbol on the PWB and the anode marking of the part.

(3) Cam switches A and B: D708 and D709.

Adjust the notch of the part to the white marker of the symbol on the PWB. Do not allow any looseness.

(4) Take-up and supply sensors: D707 and D706.

Be careful not to confuse the setting direction of the parts in reference to the symbols on the PWB. Do not allow any

looseness.

VC-TA350/TA351/351W

VC-TA352W/TA355/TA356

1. SPECIFICATIONS

Format: VHS PAL/MESECAM/NTSC standard

Video recording system: Rotary, slant azimuth two heads helical scan system

Video signal: PAL/MESECAM/NTSC colour or monochrome (System B/G, I, D/K) signals

Recording/playing time: 240 min max. with SHARP E-240 tape (PAL: SP mode)

480 min max. with SHARP E-240 tape (PAL: LP mode)

(Only for VC-TA351/TA351W, TA352W, TA355, TA356)

160 min max. with SHARP T-160 tape (NTSC: SP mode)

480 min max. with SHARP T-160 tape (NTSC: EP mode)

(Only for VC-TA351/TA351W, TA352W, TA355, TA356)

Tape width: 12.7mm

Tape speed: 23.39 mm/s (PAL: SP mode)

11.70 mm/s (PAL: LP mode)

33.35 mm/s (NTSC: SP mode)

16.67 mm/s (NTSC: LP mode) (Playback only)

11.12 mm/s (NTSC: EP mode)

Antenna: 75 ohm unbalanced

Receiving channel: VHF Channel 1A - S41, UHF Channel E21 - C57

RF converter output signal: UHF Channel E21 - E69 Adjustable preset to E60 (For A/M/B/W-version)

UHF Channel E21 - E69 Adjustable preset to E39 (For S/K/L-version)

Power requirement: AC110 - 240V, 50/60Hz

Power consumption: Approx. 13W at 240V/50Hz

Operating temperature: 5°C to 40°C

Storage temperature: –20°C to 55°C

Weight: Approx. 2.8 kg

Dimensions: 360 mm (W) x 256 mm (D) x 92 mm (H)

VIDEO

Input: 1.0 Vp-p, 75 ohm

Output: 1.0 Vp-p, 75 ohm

S/N ratio: 45 dB (PAL-SP)

Horizontal resolution: 250 lines (PAL-SP)

AUDIO 0 dBs = 0.775 Vrms

Input: Line 1: -8 dBs/47k ohm

Output: Line -8 dBs/1k ohm

S/N ratio: 46 dB (SP mode)

Frequency responce: 80 Hz ~ 10 kHz (SP mode)

80Hz ~ 5 kHz (LP/EP mode)

Accessories included: 75 ohm coaxial cable

Operation manual

Remote control unit

Battery

Note: The antenna must correspond to the new standard DIN 45325

(IEC 169 - 2) for combined UHF/VHF antenna with 75 ohm connector.

Aspartofourpolicyofcontinuousimprovement,wereservethe

right to alter design and specifications without notice.

VC-TA350/TA351/351W

VC-TA352W/TA355/TA356

2. DISASSEMBLY AND REASSEMBLY

2-1 DISASSEMBLY OF MAJOR BLOCKS

FRONT PANEL

TOP CABINET

SHIELD

ANGLE

H/A SHIELD

TOP

ANTENNA

TERMINAL

COVER

MECHANISM/

MAIN PWB

ASSEMBLY

TOP CABINET

FIX ANGLE

MAIN FRAME

TOP CABINET : Remove 2 screws 1.

FRONT PANEL : Remove 2 screws 3and 7 clips 4.

OPERATION : Remove 1 screw 6.

PWB

SHIELD ANGLE : Remove1screws7withshieldangle.

MECHANISM/ : Remove 1 screw 8, 2screws 0,

MAIN PWB 2 screws q. Remove 1screw w

with antenna terminal cover.

Remove 1 screw ewith top cabinet

fix angle.

OPERATION

PWB

VC-TA350/TA351/351W

VC-TA352W/TA355/TA356

VC-TA352W

1. When removing the mechanism from the main PWB,

removetheantennacover1screw1,andremovethe

antenna cover.

Remove the PWB bottom plate 1 screw 2.

Remove the FFC cable (AA, AD, AH) 3which con-

necting the PWB and the mechanism.

Take out vertically the mechanism so that it does not

damage the adjacent parts.

2. Removing the mechanism and cassette housing.

Remove2screws4fixingthecassettehousingtothe

mechanism, and remove the cassette housing.

MECHANISM CHASSIS

CASSETTE

HOUSING

MAIN PWB

2-2 DISASSEMBLING THE MECHANISM/MAIN PWB ASSEMBLY

VC-TA350/TA351/351W

VC-TA352W/TA355/TA356

cassette housing. (Conditions: When mechanism and

PWB have been installed)

2. Mechanical initial setting

Feed the pulley feed gear of loading motor with screw

driver. After ascertaining the return to the initial set posi-

tion (*1) install the cassette housing in the specified

position.(Thismethodisappliedonlyforthemechanism.)

Pulley feed gear

Screwdriver

Casecon

drive gear

Drive angle of

cassette housing

Tilt mark (*1)

INSTALLING THE CASSETTE HOUSING

Whenthecassettehousingisinstalledonthemechanism,

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

Step1of Installation of cassette housing.Afterascertain-

ing the return to the initial setting position (*1) install the

2-3 CARES WHEN REASSEMBLING

START SENSOR

PARTS WHICH NEED PARTICULAR CARE

Wheninstalling the mechanism chassisonthe PWB unit,

take care so as to prevent deformation due to contact of

mechanism chassis with REC TIP SW.

AE CONNECTOR

AL CONNECTOR

REC TIP SW

END SENSOR

AC CONNECTOR

INSTALLING THE MECHANISM ON PWB

Lower vertically the mechanism, paying attention to the

mechanism edge, and install the mechanism with due

care so that the parts are not damaged. So as to fix the

mechanismtothemainPWBinstall twohousings.(Fitthe

antenna cover to one of them. For other, fix the vicinity of

loading motor and solder joint side of main PWB.) Con-

nect again the FFC cable (AA-MH, AD-ME, AH-MH)

between the mechanism and the main PWB.

VC-TA350/TA351/351W

VC-TA352W/TA355/TA356

3. FUNCTION OF MAJOR MECHANICAL PARTS (TOP VIEW)

1715 10

No. Function No. Function

1 Full erase head

2 Supply pole base ass’y

3 Tension arm ass’y

4 Idler wheel ass’y

5 Pinch drive lever ass’y

6 Supply reel disk

7 Supply main brake ass’y

8 Take-up main brake ass’y

9 Pinch drive cam

10 A/C Head ass’y

11 Reverse guide lever ass’y

12 Casecon drive gear

13 Take-up reel disk

14 Pinch roller lever ass’y

15 Drum ass’y

16 Loading motor

17 Drum motor

18 Take-up pole base ass’y

VC-TA350/TA351/351W

VC-TA352W/TA355/TA356

FUNCTION OF MAJOR MECHANICAL PARTS (BOTTOM VIEW)

No. Function No. Function

19 Slow brake lever

20 Master cam

21 Capstan D.D. motor

22 Reel belt

23 Clutch lever

24 Limiter pulley ass'y

25 Shifter

VC-TA350/TA351/351W

VC-TA352W/TA355/TA356

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

5. JiGRH0002 BR

JiGSG2000 BS

JiGSG0300 BF

7. JiGADP003 BK

2. Torque Gauge

Tension Gauge

These Jigs are used for checking

and adjusting the reel disk height.

Whenfixinganyparttothethreaded

hole using resin with screw, use the

jig. (Specified torque 5 kg)

Thiscassettetorquemeterisusedforcheck-

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

2.0kg.

4. Torque Driver JiGTD1200 CB

JiGDRiVER11055

Reverse guide height

adjusting box driver This Jig is used for height adjustment of the

reverse guide (for reverse guide height ad-

justment).

Guide roller height

adjustment drive This screwdriver is used for adjusting the

guide roller height.

For X value adjustment

X value adjustment

gear type screw driver

This Jig is used for height

adjustment of the reverse guide.

12. JiGRVGH-F18 BU

11. JiGDRiVER-6 BM

Reverse Guide Height

Adjusting Jig

10. JiGDRiVERH-4 AP

9. Alignment Tape VROCPSV CK Video Audio Track

625 Monoscope 6kHz 49µm

PAL Colour bar 1kHz 49µm

This tape is especially used for electrical

fine adjustment.

VC-TA350/TA351/351W

VC-TA352W/TA355/TA356

Gently press the cleaning paper to

fix with your finger, and rotate the

upper drum to clean.

Move to and from 5 times for each head.

(Do not move the cleaning paper.)

Rotate the upper drum

with one hand.

Video head cleaning procedure

1. Apply one drop of cleaning liquid to the cleaning paper with the baby oiler.

2. Gentlypressthe cleaningpaperagainstthevideo headtofixyourfinger, andmovetheupperdrumsothateachhead

is passed to and from 5 times (do not move the cleaning paper).

3. Wipe with the dry cleaning paper.

Notes :

• Use the commercially available ethanol of Class 1 as

cleaning liquid.

• Since the video head may be damaged, do not move up

and down the cleaning paper.

• Whenever the video head is cleaned, replace the clean-

ing paper.

• Do not apply this procedure for the parts other than the

video head.

Parts Code Description Code

ZPAPRA56-001E Cleaning Paper AW

ZOiLR-02-24TE Babe Oiler (Spoit) AH

NOTE : Part replacement. : Cleaning : Apply grease

<Specified> Cleaning liquid Industrial ethyl alcohol

* 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

color and beating

Small sound or sound

distortion

Poor S/N ratio, no color

Poor flatness of the

envelope with alignment

tape

No tape running,

uneven color

No tape running, tape

slack

No tape running, tape

slack, no fast forward/

rewind motion

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

MAINTENANCE CHECK ITEMS AND EXECUTION TIME

Perform the maintenance with the regular intervals as follows so as to maintain the quality of machine.

Ce manuel convient aux modèles suivants

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