Sharp 70GS-66E Bedienungsanleitung

70GS-66E

MODEL

70GS-66E

SHARP CORPORATION

PAL I

SYSTEM COLOUR TELEVISION

SEJB70GS66E00

SERVICE MANUAL

In the interests of user safety (required y safety

regulations in some countries) the set should restored

to its original condition and only parts identical to

those specified should e used.

Issued: Tent 24 Jan 2001

This document has een pu lished to

e used for after sales service only.

DA-100 CHASSIS

PARTS LISTING..............................................28

CONTENTS

ELECTRICAL SPECIFICATION.......................3

IMPORTANT SERVICE NOTES.......................4

ADJUSTMENTS PROCEDURES.....................5

SCHEMATIC DIAGRAM..................................20

PRINTED WIRING BOARDS..........................10

COMPONENT LOCATION TABLES...............14

RTV servis Horvat

Tel: ++385-31-856-842

Tel/fax: ++385-31-856-139

Mob: 098-788-319

www.rtv-horvat-d .hr

70GS-66E

Use this page to keep any special servicing information as Technical Report (Bulletin), Technical Information, etc.

If only part num er changes are required, just change part num er directly the part num er in the Parts Listing Section.

If you need more information, please refer to the Technical Report (Bulletin).

SERVICE MANUAL UPDATE LOG SHEET

Part No.

Tec nical Report No.

Tec nical Bulletin No. Cause / Solution Page No. Application

Data /Serial No.

70GS-66E

ELECTRICAL SPECIFICATIONS

•Sweep Deflection ............................... Magnetic

•Picture Intermediate frequency

L’......................................................33.9MHz

L, B/G, D/K, I...............................38.9MHz

•Sound Carrier Trap

L’..................................................40.4MHz

L, D/K...........................................32.4MHz

B/G..............................................33.4MHz

I....................................................32.9MHz

•Adjacent Sound Carrier Trap

L’..................................................32.4MHz

L, D/K, B/G..................................40.4MHz

I....................................................40.9MHz

•Adjacent Picture Carrier Trap

L’..........................................................41.9MHz

L, D/K, I........................................30.9MHz

B/G..............................................31.9MHz

•Aerial Input Impedance

VHF/UHF ................. 75 ohm Un alanced

•Tuning Ranges ..... 45.75MHz thru 855.25 MHz

CATV Special Channels

•White Level

Set rightness control to get total picture tu e cathode current of 600 milliammeter under no signal

condition. Maximum necessary correction of each picture tu e cathode current to get 8550 degrees K+1

MPCD screen temperature should not exceed 15% of its original value.

X=0.290 Y=0.300

WARNING

The chassis in this receiver is partially hot. Use an isolation transformer etween the line cord plug

and power receptacle, when servicing this chassis.

To prevent electric shock, do not remove cover. No user-servicea le parts inside. Refer servicing to

qualified service personnel.

Specifications are su ject to change without prior notice.

•Power Input ...................... 220V-240 Volts AC 50Hz

•Power Consumption

Normal Operation ...................................88W

Stand- y Operation ..................................1W

•Audio Power Output Rating (MPO) / Impedance

Internal Left Speaker ...................... 10W, 7Ω

Internal Right Speaker .................... 10W, 7Ω

Internal Centre Speaker .............. 10W, 7Ω

Internal Su woofer .................... 20W, 4.5Ω

•Speakers

Left / Right ...............................12W, 6 x 12cm

Centre .....................................12W, 6 x 12cm

Su woofer .........................20W, 11cm Round

•Convergence

Static (Centre) .. etween any two colours

Dynamic .............. after static equals zero

•Focus ................ High Bi-Potential Electrostatic

70GS-66E

IMPORTANT SERVICING NOTES

Only qualified se vice pe sonnel a e allowed to ca y out maintenance and epai of this eceive .

SERVICING OF HIGH VOLTAGE SYSTEM AND CRT

It is impo tant that the static cha ge is emoved f om the high voltage system when ca ying out wo k

on the eceive . This can be achieved by connecting a 10K esisto (with a suitably insulated lead) f om

the CRT cavity connecto to the CRT g ound tag. This must be ca ied out with the AC supply discon-

nected f om the eceive .

Note the following:

• The CRT in this eceive employs Integ al Implosion P otection.

• If the CRT has to be changed it MUST be eplaced with the co ect type fo continued safe

wo king

• DO NOT lift the CRT by its neck.

• When handing the CRT, ensu e that shatte p oof goggles a e wo n.

• Ensu e that the CRT is discha ge befo e handling.

X-RAY

This eceive is designed to keep any x- ay emission to an absolute minimum. Some fault conditions

and se vicing p ocedu es may p oduce potentially haza dous x- ay adiation levels. This is a p oblem

when in close p oximity to the eceive fo long pe iods of time. To educe any isks associated with

this, please obse ve the following p ecautions:

1. When unde taking any se vicing on this chassis, DO NOT inc ease the EHT to mo e than 28 KV,

(at a instantaneous beam cu ent of 1500µΑ).

2. Ensu e that du ing no mal ope ation the EHT does not exceed 25KV±1.5KV (at a beam cu ent of

1000µΑ). This level has been p eset in the facto y. Always check that this level has not been ex-

ceeded afte ca ying out any epai on the eceive .

3. DO NOT eplace the CRT with any othe type than that specified in the pa ts listing as this may

cause excessive x- ay adiation.

BEFORE RETURNING THE RECEIVER TO THE CUSTOMER

In addition to the above checks, the following should also be ca ied out befo e etu ning the eceive

to the custome .

1. Inspect all the leads to ensu e that they a e d essed co ectly and that they a e not obst ucted o

pinched by any othe pa ts.

2. Ensu e that all p otective devices a e in good condition. These will include nonmetallic cont ol

knobs, insulating fish pape s, cabinets backs, compa tment cove s o shields, mechanical insulato s,

etc.

70GS-66E

ADJUSTMENT PROCEDURES

All adjustments to this chassis, except for focus, are carried out in the service mode.

••

• SERVICE MODE

The service mode is provided to ena le the engineer to correctly set up the receiver to the CRT fitted in the set.

Note that these adjustments may vary from one receiver to another.

To enter the service mode, carry out the following procedure.

1. Connect a test pattern to the antenna terminal.

2. Tune the receiver to this signal.

3. Turn the receiver off using the mains switch.

4. Press volume down and channel up uttons on the

front of the receiver at the same time.

5. Keeping these uttons pressed, turn the mains on.

6. When the set starts up it will e in service mode.

7. Release the two uttons.

••

• Use the channel up and down uttons to move etween the options.

••

• Use the volume control uttons to change the data.

••

• To store the data, use the stand- y utton on the remote control.

••

• To exit the service mode, turn the receiver off using the mains switch.

When the service mode is entered the following On Screen Display appears

-SERVICE SOFTWARE AND HEXADECIMAL COUNTER DISPLAY:

SW ON XXXX SW OFF XXXX HOURS ON XXXX

The figures displayed in the XXXX locations are hexadecimal representations of the num er of times that particular

function has een executed. For example if the hexadecimal num er displayed after SW ON was 0E4A, this would

correspond to the receiver eing turned on 3658 times.

Adjustment menu:

The following adjustments can e carried out in the service mode.

• Horizontal Shift

• East West Width

• Pin Phase

• Pin Amp

• Upper corner correction

• Lower corner correction

• Vertical Linearity

• Vertical angle

• Vertical ow

• Vertical Amplitude

• S Correction

• Extreme Corner Correction

• Vertical Shift

• Red Cut Off

• Green Cut Off

• Blue Cut Off

• Alter NVM Page

• Alter NVM Position

• Alter NVM Value

• Teletext Mix Mode Contrast

• Teletext Contrast

• OSD Contrast

• DVCO Adjustment (Only PAL)

• DVCO Adjustment (Only NTSC)

• Luma croma delay

• AGC Adjustment

• AFT Adjustment (BG-I-L)

• AFT Adjustment (L’)

• OPC Value

• Auto Installation On/Off

Geometry Adjustments

All geometry adjustments are ased on an internally generated test pattern as shown

in figure 1. When carrying out any of the a ove geometry adjustments, use the inter-

nally generated test pattern for guidance.

Fig.1

70GS-66E

The following geometry adjustments can e carried out. Detailed instructions on how to execute these are given on

the following pages

Horizontal

• Horizontal Shift

• E-W Width

• Pin Phase

• Pin Amp

• Upper Corner Amplitude

• Lower Corner Symmetry

• Extreme Corner Symmetry

Vertical

• Vertical Amplitude

• S Correction

• Vertical Shift

• Vertical Linearity

• Vertical angle

• Vertical ow

Just in case the TV set requires a full geometries adjustment, please proceed first with

Vertical according to the a ove order, and after that, adjust Horizontal according to the

a ove order.

Horizontal S ift

Adjust the horizontal shift so that the picture is centred.

The effect of this adjustment is shown in figure 2.

• When the volume up utton is pressed, the picture moves to the left.

• When the volume down utton is pressed, the picture moves to the right.

• Press the stand- y utton on the remote control to store.

E-W Widt

Adjust the E-W Width so that 9% over-scan is achieved.

The effect of this adjustment is shown in figure 3.

• When the volume up utton is pressed, horizontal scanning increases.

• When the volume down utton is pressed, horizontal scanning decreases.

• Press the stand- y utton on the remote control to store.

Pin P ase

Adjust the Pin Phase so that the picture is symmetrical top and ottom.

The effect of this adjustment is shown in figure 4.

• When the volume up utton is pressed, side pincushion changes.

• When the volume down utton is pressed, side pincushion changes.

• Press the stand- y utton on the remote control to store.

Pin Amp

Adjust the Pin Amplitude so that the picture is centred.

The effect of this adjustment is shown in figure 5.

• When the volume up utton is pressed, side pincushion changes from pincushion to

arrel shape.

• When the volume down utton is pressed, side pincushion changes from pincush-

ion to arrel shape.

• Press the stand- y utton on the remote control to store.

Upper Corner Correction

Adjust the Upper Corner Correction so that the picture is centred.

The effect of this adjustment is shown in figure 6.

• When the volume up utton is pressed, side pincushion changes from pincushion to

arrel shape.

• When the volume down utton is pressed, side pincushion changes from pincush-

ion to arrel shape.

• Press the stand- y utton on the remote control to store.

Fig.2

Fig.3

Fig.4

Fig.5

Fig.6

70GS-66E

Lower Corner Correction

Adjust the Lower Corner Correction so that the picture is centred.

The effect of this adjustment is shown in figure 7.

• When the volume up utton is pressed, side pincushion changes from pincushion to

arrel shape.

• When the volume down utton is pressed, side pincushion changes from pincushion to

arrel shape.

• Press the stand- y utton on the remote control to store.

Vertical Linearity

Adjust the Vertical Linearity so that the upper and lower parts of the picture are symmetrical.

The effect of this adjustment is shown in figure 8.

• When the volume up utton is pressed, the upper picture scanning decreases and the

lower picture scanning increases.

• When the volume down utton is pressed, the upper picture scanning increases and the

lower picture scanning decreases.

• Press the stand- y utton on the remote control to store.

Vertical Angle

Adjust the Vertical Amplitude so that the picture is centred.

The effect of this adjustment is shown in figure 9

• When the volume up utton is pressed, the vertical angle changes to right.

• When the volume down utton is pressed, the vertical angle changes to left.

• Press the stand- y utton on the remote control to store.

Vertical Bow

Adjust the Vertical Bow so that the picture is centred.

The effect of this adjustment is shown in figure 10

• When the volume up utton is pressed, the vertical ow changes to right.

• When the volume down utton is pressed, the vertical ow changes to left.

• Press the stand- y utton on the remote control to store.

Vertical Amplitude

Adjust the Vertical Amplitude so that the picture is over-scanned.

The effect of this adjustment is shown in figure 11.

• When the volume up utton is pressed, the vertical size of the picture increases.

• When the volume down utton is pressed, the vertical size of the picture decreases.

• Press the stand- y utton on the remote control to store.

S Correction

Adjust the S Correction so that the picture symmetrical etween the top, centre and ottom.

The effect of this adjustment is shown in figure 12.

• When the volume up utton is pressed, the top and ottom scanning increases and the

centre scanning decreases.

Fig.8

Fig.12

Fig.11

Fig.7

Fig.10

Fig.9

70GS-66E

Colour Adjustments

The following adjustments should only e carried out when

the CRT, IC801 or IC801 are replaced.

G2, Cut Off and Gain Adjustments

1. Follow t e procedure below to set t e G2

1.1 Tune the set to the output of a signal generator

(cross hatch pattern).

1.2 In the user menu, set contrast to 80/100 and

rightness to 40/100.

1.3 Connect the oscilloscope to the red cathode and

adjust G2 to read 135V on the sensor pulse as

in the drawing:

NOTE:

Oscilloscope should e adjusted for vertical TV field trigger

and synchronized with video signal.

2. Follow t e procedure below to set t e Cut Off.

2.1 Adjust G2.

2.2 Tune a white card.

2.3 Adjust colour to minimum.

X=0.290 ± 0.015 Y=0.300 ± 0.015

2.4 Position colorimeter in the centre of screen.

2.5 Adjust rightness and contrast to o tain a lumi-

nance of ≈20 NITS.

2.6 Operate in Service Mode and select location RED

CUT OFF, GREEN CUT OFF and BLUE CUT

OFF, to o tain colour coordinates:

To increase press volume-up utton and to decrease press

volume down utton.

RED CUT OFF alte «X» coo dinate.

GREEN CUT OFF alte «Y» coo dinate.

BLUE CUT OFF alte «X» and «Y» coo dinate.

C anging NVM Data

To change the data contained within the Non Volatile

Memory, it is necessary to first select the page the data is

stored in, then the position and finally to change the data

itself. The procedure elow outlines this process.

1. While on ALTER NVM PAGE, use the volume up/down

uttons to change this data (data is shown in hexadecimal

format).

2. Press the channel up utton and ALTER NVM POSITION

appears, use the volume up/down uttons to change this

data (data is shown in hexadecimal format).

3. Press the channel up utton and ALTER NVM VALUE

appears, use the volume up/down uttons to change this

data (data is shown in hexadecimal format).

• When the volume down utton is pressed the top and ottom scanning decreases and

the centre scanning increases.

• Press the stand- y utton on the remote control to store.

Vertical S ift

Adjust the Vertical Shift so that the picture is centred.

The effect of this adjustment is shown in figure 13.

• When the volume up utton is pressed, the picture moves up.

• When the volume down utton is pressed, the picture moves down.

• Press the stand- y utton on the remote control to store.

Extreme Corner Correction

Adjust the Extreme Corner Correction so that the picture is centred.

The effect of this adjustment is shown in figure 14.

• When the volume up utton is pressed, side pincushion changes from pincushion to

arrel shape.

• When the volume down utton is pressed, side pincushion changes from arrel shape to

pincushion.

• Press the stand- y utton on the remote control to store.

135 V

CH1 gnd

Fig.14

Fig.13

70GS-66E

4. Once this data has een set, press the stand y utton to store.

5. If another NVM value has to e changed, use the channel down utton to select the page or position and repeat as

necessary.

Note:

DO NOT change any NVM data, unless you have een advised to do so y a Sharp representative. If data is incorrectly

changed, serious damage may occur to the receiver.

Contrast Adjustments

Three types of contrast levels can e varied as listed elow:

• TELETEXT MIX MODE CONTRAST

• TELETEXT CONTRAST

• OSD CONTRAST

Use the volume up/down uttons to adjust to a suita le level, then press the stand y utton to store.

DVCO Adjustment (PAL)

Carry out the DVCO Adjustment (PAL) as shown elow:

1. Receive a Phillips pattern signal.

2. While in the DVCO ADJUSTMENT (PAL) menu, press the stand y utton.

3. The adjustment will e carried out automatically and stored.

DVCO Adjustment (NTSC)

No adjustment required.

Auto Installation On/Off

To return the receiver to the original Auto Installation mode, using the volume up or down utton, set the Auto Installation

On/Off to On. This setting is automatically stored and when the receiver is turned on the next time it will start up in Auto

Installation mode.

AGC Adjustment

To correctly align the Automatic Gain Control, follow the procedure outlined elow:

1. Tune the set into a pattern generator on CH10.

2. Adjust the signal strength of the pattern generator to 57uV

3. Enter the service mode.

4. Enter the AGC Adjustment menu.

5. Press the stand y utton on the remote control.

6. The adjustment will e carried out and stored automatically.

AFT Adjustment (BG-I, SECAM L)

To correctly align the Automatic Fine Tune, follow the procedure outlined elow:

1. Tune the set into a pattern generator on CH69.

2. Enter the service mode.

3. Enter the AFT Adjustment menu.

4. Press the stand y utton on the remote control.

5. The adjustment will e carried out and stored automatically.

AFT Adjustment (SECAM L’)

To correctly align the Automatic Fine Tune, follow the procedure outlined elow:

1. Tune the set into a pattern generator on CH04.

2. Enter the service mode.

3. Enter the AFT Adjustment menu.

4. Press the stand y utton on the remote control.

5. The adjustment will e carried out and stored automatically.

70GS-66E

TENTATIVE

Page 11

MOTHER UNIT PRINTED WIRING BOARD. Component side.

10 11 12 13 14 15 16

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THE ACTIVE SECTION

IS INDICATED WITH

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