Sharp 14VT10X1 Manual de usuario

SHARP

SERVICE

MANUAL

S81G314VT10X1

VIDEO TV

MODEL

‘I

70x1

In the interests of user-safety (Required by safety regulations

in some countries) the set should be restored to its original con-

dition and only parts identical to those specified should be used.

CONTENTS

SPECIFICATIONS

............................................................

IMPORTANT SERVICE NOTES

................................................

DISASSEMBLYANDREASSEMBLY

............................................

FUNCTION OF MAJOR MECHANICAL PARTS

...................................

ADJUSTMENT, REPLACEMENTANDASSEMBLY OF MECHANICAL UNITS

.........

ADJUSTMENT OF THE ELECTRICAL CIRCUITRY

................................

TROUBLESHOOTINGGUIDE

.................................................

.BLOCKDIAGRAM ..........................................................

SIGNAL FLOW SYMBOLS AT A GLANCE

.......................................

.WAVEFORMS .............................................................

OVERALLDIAGRAM

........................................................

SCHEMATICDIAGRAMS

.....................................................

.WlRlNGSlDEPWBs .........................................................

115

REPLACEMENT ELECTRICAL PARTS LIST

.......................................

121

EXPLODEDVIEWS

..........................................................

137

PACKINGOFTHESET

.......................................................

141

SHARP

CORPORATION

DISASSEMBLY AND REASSEMBLY

Remove the seven back cabinet fastening

screws

Remove the one wire fastening screw

Remove the three VCR’s power unit fastening

screws @.

Remove the six VCR fastening screws

and

remove the VCR with the VCR’s operation.

Remove the CRT’s second anode cap

from

the CRT.

Remove the “L2” lead wire

from the CRT

socket unit

@I.

Remove the

CRTsocket

unit

@I.

Remove the TV mother unit with the frame

from the front cabinet.

10.

11.

12.

13.

14.

15.

16.

Remove the five TV mother unit fastening

screws

from the frame.

Remove the two speaker holder fastening

screws

and remove the holder.

Remove the speaker

Remove the control unit fastening screw

and remove the control unit from the front

cabinet.

Remove the two control unit fastening

screws

Removethe one control unit fastening screw

Remove the four CRT fastening screws

DISASSEMBLY AND REASSEMBLY OF THE VCR SECTION

1. Remove the eight VCR holder fastening screws

2. Remove the four upper cabinet fastening

screws

3. Remove the seven bottom plate fastening

screws

4. Remove the four cassette housing fastening

screws

5. Remove the five main PWB fastening screws

6. Remove the two head amp fastening screws

7. Remove the four mechanism chassis fastening

screws

8. Release the seven operation panel fastening

clips

and remove the operation upper panel.

9. Remove the six operation holder fastening

screws

The VCR power unit removal

is described in the previous

FUNCTION OF MAJOR MECHANICAL PARTS (TOP VIEW)

pole base ass’y

AHC

(fwtomatic

headcleaner)

($)

Cam

stitch

@A/C

head ass’y

23 Dew sensor

Full erase head ass’y

Supply pole base

ass’y

Tension arm ass’

Loadi ng

motor

Relay

shifter lever

au-

-/I

(14)

Caostan

D.D.motor

@Half-loading lever

No.

Function

No.

Function

Full erase head ass’y

13.

Erase the whole records on the tape in the recording Reverse guide

mode. Pulls out the tape in the video search rewind mode,

and controls the tape drive train height with the upper

Tension arm ass’y

and

lower guides.

Detects the tension of tape while running, and brakes

the supply reel disk via the tension band.

15.

Relay shifter lever

Transmits the operation of the master cam to the

Brake shifter brake shifter, and operates the reverse guide.

Set-the position of brake or the like in accordance with

the modes such as stop and playback.

16.

Pinch roller lever ass’y

Back tension lever Press-fits the tape to the capstan during tape running.

Bakes the supply reel disk to a certain degree to The right protrusion switches the clutch of the cassette

prevent tape slackening during “half-loading”,housing control assembly in “tape eject”, and makes

“loading” and “shifting from playback to video search the mechanism

ejectthe

tape.

rewind”.17.Master cam

Main supply brake lever Turns clockwise during loading, and counterclockwise

Brakes the supply reel disk to prevent tape slackening during unloading, and moves the shifter or the like in

when the unit is stopped in fast forward or rewind accordance with each mode.

mode.

18.

Main take-up brake lever Loading motor

A motive power which drives the mechanism. It

Brakes the take-up reel disk to prevent tape slackening

when the unit is stopped in fast forward or rewind transmits the power to the master cam and cassette

mode. housing control assembly via the belt.

10.

Half-loading lever

19.

Cam switch

Bring the tape in contact with the A/C head, putting it Rotates synchronously with the master cam, and

in half-loading state in the fast forward or rewind detects the position of each mode by means of the

mode. internal switch

11.

Video search brake lever

23. Dew sensor

It is in contact with the take-up reel disk normally, and An element which detects condensation inside the

brakes

itto

a certain degree. It applies larger brake in unit. This element is activated, when it senses

the videosearch rewind mode. condensation, to interrupt the mechanism.

rer

FUNCTION OF MAJOR MECHANICAL PARTS (BOmOM VIEW)

Relay gear drive lever

@Take-up

loading gear

Slow brake lever

Loading relay gear 2

Capstan D.D.motor 3

Reel belt

Brake solenoid 5

Supply loading gear

-4

AuxiliaFy

fast forward

brake lever

6 Reel pulley

IlO.

Function

No.

Function

Slow brake lever

Reelsensor

Gets in contact with the capstan D.D. motor linking to An element which sheds the light onto the reflection

the master cam in the slow still mode, and brakes it to a plate affixed to the bottom side of the reel disk, and

certain

degree.

detects the rotation of the reel disk through receiving

the reflected light.

Capstan D.D. motor

A motive power which runs the tape. It transmits the

power via the reel belt.

Auxiliary fast forward brake lever

Brakes the supply reel disk to a certain degree in the

fast forward and rewind modes.

’

Reel belt

Transmits the

powerto

run the tape to the reel pulley.

Take-up loading gear

Shifts the take-up pole base and guide roller via the

loading relay gear, and applies the tape around the

drum assembly, as well as transmits the power to the

supply loading gear.

Brake solenoid

10.

Supply loading gear

Adsorbs and holds the brake shifter in the fast forward Shifts the supply pole base and guide roller via the

and rewind modes, and releases it in the stop mode. take-up loading gear, and applies the tape around the

drum assembly.

Reel pulley

11.

Relay gear

drove

lever

Transmits the power of the capstan

D.D.

motor to the Transmits the movement of the master cam to the

reel disk via the reel idler. take-up loading gear via the loading relay gear.

ADJUSTMENT, REPLACEMENT AND ASSEMBLY

OF MECHANICAL UNITS

Here we will describe a relatively simple service

work in the field, not referring to the more

complicated repairs which would require the use of

special equipment and tools (drum assembly

replacement, for example).

We are sure that the easy-to-handle tools listed

below would be more than handy for periodical

maintenance to keen the machine in its oriainal

working condition.

TOOLS NECESSARY FOR ADJUSTING THE MECHANICAL UNITS

The following tools are required for proper service and satisfactory repair.

Jig Item Configuration

Remarks

These Jigs are used for checking and

adjusting the reel disk height

Head Tilt Adjusting Jig This Jig is used for setting the

A/C

These Jigs are used for checking and

adjusting the torque of take-up and

Gauge Head JiGTH0006

This cassette torque meter is used

Cassette Torque Meter

JiGVHT-063

for checking and adjusting the

torque of take-up for measuring

tape back tension.

Tension Gauge (3009)

JiGSG0300

BFThere are two Gauges used for the

Tens&

Gauge (2.0kg)

JiGSG2000

*.okg.

tensron measurements, 300

and

Hex Wrench (0.9mm) JiGHW0009 AE

Hex Wrench (1.2mm)

These Jigs are used for loosening or

JiGHWOO12 AE tightening special hexagon type

screws.

Hex Wrench (1.5mm) JiGHWOO15 AE

Alignment Tape (PAL) VROCPSV CD

These tapes are especially used for

Alignment Tape (NTSC) VROATSV CDelectrical fine adjustment.

Drum Replacing Jig

JiGDT-0001

BGThis is used for replacement of the

VCR’s upper drum.

Torque Driver

Box Driver

Jig Item

Part No.

rension Gauge Adapter

JiGADP003

jpecial

Bladed Screwdriver

JiGDRiVERH-4

Tension Band and Plate

9djusting

Jig

Retaining Guide Height

Adjusting Jig

Reverse Guide Height

Adjusting Jig

JiGDRiVER-

JiGTDl200

JiGDRiVER

10-7

JiGDRiVER

10-4

JiGGH-F18

JiGRVGH-F18

:odc

Configuration

;“.:;

Remarks

rhis Jig is used with the tension

gauge. Rotary Transformer

Clearance Adjusting Jig.

This Screwdriver is used for

adjusting the guide roller height.

This Jig is used for adjusting the

tension band and tension plate.

This is used to screw down resin-

made parts: the specified torque is 5

kg.

This Jig is used for height

adjustment of the

PJC

head and X-

position.

This Jig is used for height

adjustment of the retaining guide.

This jig is used for height

adjustment of the retaining guide.

This Jig is used for height

adjustment of the reverse guide.

MECHANICAL PARTS REQUIRING PERIODICAL INSPECTION

Use the following table as a guide to maintain the mechanical parts in good operating condition.

inner hole and shaft)

Loadfng Motor

Automatic Head Cleaner

Reel block*

-4

*See

the table below for servicing the reel block parts.

Possible symptom encountered Remarks

-atera

noises

-lead occasionally blocked

Door

S/N ratio, no

colour

Door

colour,

beating

Sound

toosmall

or distorted

No tape running, uneven

colour

No tape running, tape slack

Lateral image swing

Cassette not loaded or unloaded

See the chart below

Abnormal rotation or

significant

vibration

requires replacement

Clean with pure high

quality isopropyl alcohol.

Clean tape contact part

with the specified cleaning

liauid.

Clean tape

contact

&ea

with

the specified cleaning

liquid.

Clean rubber and rubber

contact area with the

specified cleaning liquid.

Replace the roller of the

cleaner when it wears

down. Just change the

video head cleaner arm

assembly for new one.

Supply/take-up

reel disks on

No tape running, tape slack Clean

with

pure htgh

quality Isopropyl alcohol.

Vtdeo search brake lever

Idler gear

ass’y

Notape

running

Reel Pulley onno on

Maln

supply/take-up

brake levers

Tapeslack

NOTE:

Part replacement.

cl:

Cleaning (For cleaning, use a lint-free cloth dampened with pure isopropyl alcohol).

Oil refilling (The indicated point should be lubricated with high quality spindle oil every

1000

hrs).

If the reading is out of the specified value, clean or replace the part.

R,EMOVAL AND REASSEMBLY OF

CASSETTE HOUSING CONTROL ASSEMBLY

Removal

Set the cassette ejected condition in the cassette

eject mode.

Unplug the recorder from the main source.

Follow the procedures below in the specified

order.

a) Remove the cassette loading belt

b) Disconnect the FFC (full Flat Cable)

c) Remove the cassette housing installation

Place the unit in the eject mode in removal or

reassembly of the cassette housing control

assembly.

Load the cassette once onto the cassette housing

control

assembly

after reassembly. (If the

cassette housing control assembly normally

operates after this, the phases of mechanism and

the

cassette

controller are accurately adjusted

after ejection.)

screws

d) Slide and pull out the cassette housing control

MECHANICAL OPERATION CHECK

WITHOUT

CASSElTE

assembly

upward

@I.

When power is on, the general operations of the

~-I-

/==h

Cassette housing

setscrew

mechanism can be checked without a cassette.

Note the following points.

1. Check video search rewind and rewind, rotating

the take-up reel disk

by hand (in either

!rse

direction). If it is not rotated,

works to shift

the’Lmechanism

C1I.c

G,\-LC

,,,““d.

2. When the stop button is pressed, the mechanism

does

not

stop at a normal stop position. It shifts

to the eject mode and stops.

3. When the stop button is pressed in the playback,

video search rewind, and video search forward

modes, the supply reel disk

keeps on rotating

for several seconds for elimination of tape slack

in the course of shifting to the eject mode. In

such a case, rotate the take-up reel disk

somewhat by hand, and the supply reel disk

stops, which can reduce the working time.

Insert the tab of

the cassette hosing

REpLAC~liACil’

fiC

\Il,h”l”

\“,,,rrl

IVI

VvnrcL

control assembly to

ASSEMB

the mechanism chassis.

Figure 1-l.

Reassembly

1. Before installation of the cassette housing

control assembly, place the unit in the stop mode

with the power on, then unplug the power cord.

(The main body is placed in the eject mode.)

2. Follow the procedures for removal in the reverse

order.

Notes:

1. Be sure to unplug the power cord in removal and

reassembly.

2. Keep the cassette loading belt free from grease.

In case of its adhesion, clean the belt.

3. In using a magnet screw driver, be sure to keep it

away from

the

A/C

head, FE (Full Erase) head, or

the drum.

4. In removal and reassembly, take care not to hit

the

cassette

housing control assembly or tools

against the guide pin, drum, or the like

thereabout.

Cassette housing

Cassette housing frame

(R)

Figure

l-2.

Removal

1. Unsolder the cassette switch connectors (No. 16,

17) from the stat-t sensor PWB.

r/7

/Start

sensor

PWB

5. Place the slider pin just above the worm wheel

(Figure l-7). (The retainer of the slider is locked

at two positions hen. So unlock it as in the

Figure

l-8.)

6. Pull out the worm wheel assembly toward you

pressing the switch lever upward. (Figure

l-7)

Start sensor

fixing hook

Cassete

switch

connector

Figurer

l-3.

PWB

2. Lift the start sensor PWB pressing the two start

sensor PWB fixing hooks inward.

-Qqd

Start sensor PWB

Start

sensor PWB fixing hook

Figure

l-4.

3. Unscrew one

tight screw to detach the worm

bracket.

Note: The worm shaft bearing can easily come

out of position. So be careful not to lose

it.

-Worm

wheel

ass’y

Figure

l-5.

bracket

4. Remove the worm shaft assembly, pulley, and

cassette loading belt all from the cassette

housing frame (R).

Worm shaft

ass’y

Worm wheel ass’y

-Cassette

frame

(R)

hosing

-s

witc

lever

Cut washer

Figure l-7.

Slider Retainer opening

(Also provided on the

IL)

side

of cassette housing frame)

Cassette housing

rSlider

--Id

Press.

Retainer

Cassette housing frame

(R)

(Ll

side

Figure

1-8.

Reassembly

1. Turn the phase gear clockwise until the slider

comes to a halt in the cassette insertion

direction. (See the Figure l-9.)

2. Insert the set up worm wheel gear assembly into

the cassette housing frame

(R),

matching the

mark on the phase gear with the mark on the

worm wheel gear. Detach the cut washer on the

phase gear assembly and the phase gear for

easier installation of worm wheel assembly.

Note: Make sure that the slider pin is in the

groove of the drive gear arm.

Figure

l-6.

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