SONY AE-2 Service Manual

KV-25K1

SERVICE MANUAL

MODEL

KV-25K1A KV-25K1B KV-25K1D KV-25K1E

RM-862

DEST.COMMANDER CHASSIS NO.

Italian

French

AEP

Spanish

SCC-K43H-A

SCC-K45H-A

SCC-K41H-A

SCC-K42H-A

MODEL

KV-25K1K KV-25K1R KV-25K1U

AE-4

COMMANDER

RM-862

CHASSIS

DEST.

OIRT

Russian

CHASSIS NO.

SCC-K44J-A

SCC-K44K-A

SCC-K46D-A

MDP2

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RM-862

TRINITRON COLOR TV

MICROFILM

— 1 —

KV-25K1

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LEDOMA1K52B1K52D1K52E1K52K1K52R1K52U1K52

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Picture Tube Super Trinitron

Approx. 63 cm (25 inches) (Approx. 59 cm picture measured diagonally) 100˚ deflection

Rear/Front Terminals [REAR]

21-pin Euro connector (CENELEC standard)

- Inputs for audio and video signals

- Inputs for RGB

- Outputs of TV video and radio signals 2/ 2 21-pin Euro connector

- Inputs for audio and video signals

- Inputs for audio and video signals (selectable) 2 Audio outputs - phono jacks

SPECIFICATIONS

[FRONT]

3 Video input - phono jack 3 Audio inputs - phono jacks 3 S video input - 4 pin DIN Headphone jack - stereo minijack

Sound output 30Wx2 (music power)

15Wx2 (RMS) Dimensions 612X515X496mm approx. Weight Approx. 35.5kg Supplied accessories RM-862 Remote Commander (1)

R6 batteries (2) Other features TELETEXT , Fastext

FLOF/TOP text,

NICAM (KV-25K1B/25K1E/25K1U ony)

— 2 —

[RM-862]

Remote control system Infrared control Power requirements 3V dc (2 batteries) R6 (size AA) Dimensions Approx. 210x56x24 mm (w/h/d) Weight Approx. 110g

(Not including battery)

Design and specifications are subject to change without notice.

Model name

A1K52-VKB1K52-VKD1K52-VKE1K52-VKK1K52-VKR1K52-VKU1K52-VK

Item

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KV-25K1

WARNING ( KV-25K1U only )

The flexible mains lead is supplied connected to a B.S. 1363 fused plug having a fuse of 5 AMP capacity. Should the fuse need to be replaced, use a 5 AMP FUSE approved by ASTA to BS 1362, ie one that carries the mark. IF THE PLUG SUPPLIED WITH THIS APPLIANCE IS NOT SUITABLE FOR YOUR SOCKET OUTLETS IN YOUR HOME. IT SHOULD BE CUT OFF AND AN APPROPRIATE PLUG FITTED. THE PLUG SEVERED FROM THE MAINS LEAD MUST BE DESTROYED AS A PLUG WITH BARED WIRES IS DANGEROUS IF ENGAGED IN A LIVE SOCKET OUTLET. When an alternative type of plug is used it should be fitted with a 5 AMP FUSE, otherwise the circuit should be protected by a 5 AMP FUSE at the distribution board.

ASA

How to replace the fuse. Open the fuse compartment with the screwdriver blade and replace the fuse.

FUSE

— 3 —

KV-25K1

L/G/S/I R/D/D/D

…3

…

MONO

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21 pin connector ( 1, 2/ 2 )

21 19 17 15 13 11

9 7 5 3 1

20 18 16 14 12 10

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— 4 —

TABLE OF CONTENTS

Section Title PageSection Title Page

KV-25K1

1. GENERAL

Overview ....................................................................

Basic Operation ..........................................................

Advanced Operation ...................................................

Teletext .......................................................................

Optional Equipment ...................................................

Additional Information ...............................................

2. DISASSEMBLY

2-1. Rear Cover Removal ..................................................

2-2. Chassis Assy Removal ...............................................

2-3. Service Position..........................................................

2-4. G Board Removal.......................................................

2-5. A Board Removal.......................................................

2-6. Picture Tube Removal ................................................

Removal and Replacement of

the Main-Bracket Bottom Plates ................................

3. SET-UP ADJUSTMENTS

3-1. Beam Landing ............................................................

3-2. Convergence...............................................................

3-3. Focus ..........................................................................

3-4. Screen (G2), White Balance

(Adjustment in the service mode

with remote commander .............................................

4. CIRCUIT ADJUSTMENTS

4-1. Electrical Adjustments................................................

4-2. Volume Electrical Adjustments..................................

4-3. Test Mode 2:...............................................................

5. DIAGRAMS

7 8

9 13 15 16

17 17 17 17 18 18

5-1. Block Diagram (1)......................................................

Block Diagram (2) ......................................................

Block Diagram (3) ......................................................

Block Diagram (4) ......................................................

Block Diagram (5) ......................................................

5-2. Circuit Boards Location .............................................

5-3. Schematic Diagrams and Printed Wiring Boards.......

*A Board ....................................................................

*C Board.....................................................................

*T Board .....................................................................

*B Board.....................................................................

*G Board ....................................................................

*D Board ....................................................................

*VM Board .................................................................

5-4. Semiconductors ..........................................................

5-5. IC Blocks....................................................................

6. EXPLODED VIEWS

20 21 23

6-1. Chassis........................................................................

6-2. Picture Tube ...............................................................

7. ELECTRICAL PARTS LIST ...............................

24 28 29

31 33 35 39 41 44 44 49 57 61 67 75 80 85 87 90

91 92

SHORT CIRCUIT THE ANODE OF THE PICTURE TUBE AND THE ANODE CAP TO THE METAL CHASSIS, CRT SHIELD, OR CARBON PAINTED ON THE CRT, AFTER REMOVING THE ANODE.

AN ISOLATION TRANSFORMER SHOULD BE USED DURING ANY SERVICE TO AVOID POSSIBLE SHOCK HAZARD, BECAUSE OF LIVE CHASSIS. THE CHASSIS OF THIS RECEIVER IS DIRECTLY CONNECTED TO THE AC POWER LINE.

SAFETY-RELATED COMPONENT WARNING!! COMPONENTS IDENTIFIED BY SHADING AND MARK ON THE SCHEMATIC DIAGRAMS, EXPLODED VIEWS AND, IN THE PARTS LIST ARE CRITICAL FOR SAFE OPERATION. REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.

CAUTION

WARNING !!

APRES AVOIR DECONNECTE LE CAP DE L'ANODE, COURTCIRCUITER L'ANODE DU TUBE CATHODIQUE ET CELUI DE L'ANODE DU CAP AU CHASSIS METALLIQUE DE L'APPAREIL, OU AU COUCHE DE CARBONE PEINTE SUR LE TUBE CATHODIQUE OU AU BLINDAGE DU TUBE CATHODIQUE.

AFIN D'EVITER TOUT RISQUE D'ELECTROCUTION PROVENANT D'UN CHÁSSIS SOUS TENSION, UN TRANSFORMATEUR D'ISOLEMENT DOIT ETRE UTILISÉ LORS DE TOUT DÉPANNAGE. LE CHÁSSIS DE CE RÉCEPTEUR EST DIRECTEMENT RACCORDÉ À L'ALIMENTATION SECTEUR.

ATTENTION AUX COMPOSANTS RELATIFS À LA

LES COMPOSANTS IDENTIFIÈS PAR UNE TRAME ET PAR UNE MARQUE SUR LES VUES EXPLOSÉES ET LES LISTES DE PIECES SONT D'UNE IMPORTANCE CRITIQUE PUR LA SÉCURITÉ DU FONCTIONNEMENT. NE LES REMPLACER QUE PAR DES COMPOSANTS SONY DONT LE NUMÉRO DE PIÉCE EST INDIQUÉ DANS LE PRÉSENT MANUEL OU DANS DES SUPPLÉMENTS PUBLIÉS PAR SONY.

ATTENTION

ATTENTION !!

SÉCURITÉ!!

— 5 —

SECTION 2

DISASSEMBLY

— 17 —

2-1. REAR COVER REMOVAL

Rear Cover

2-3. SERVICE POSITION

Nine screws (BVTP 4x16)

2-2. CHASSIS ASSY REMOVAL

2-4. G BOARD REMOVAL

Push the claw of the bracket in the direction of the arrow and remove.

KV-25K1

2-5. A BOARD REMOVAL 2-6. PICTURE TUBE REMOVAL

Push the claw of the bracket in the direction of the arrow and remove.

Holder DGC

Degaussing coil

Spring tension

KV-25K1

— 18 —

• REMOVAL OF ANODE-CAP

Note:

Short circuit the anode of the picture tube and the anode cap to the metal chassis, CRT shield or

carbon paint on the CRT, after removing the anode.

* REMOVING PROCEDURES.

Turn up one side of the rubber cap in the direction indicated by the arrow a

2 Using a thumb pull up the rubber cap

firmly in the direction indicated by the arrow b

• HOW TO HANDLE AN ANODE-CAP

Don't damage the surface of anode-cap with sharp shaped material ! Don't press the rubber hardly not to hurt inside of anode-caps !

A metal fitting called as shatter-hook terminal is built into the rubber.

Don’t turn the foot of rubber over hardly ! The shatter-hook terminal will stick out or damage the rubber

C board

Speaker

Two Screws

Four tapping screws (M)

3 When one side of the rubber cap is

separated from the anode button, the anode-cap can be removed by turning up the rubber cap and pulling it up in the direction of the arrow c

Anode button

Anode cap

Picture tube

Chassis

Speaker

Two Screws

Neck Assy

Deflection

Yoke

Cushion

REMOVAL AND REPLACEMENT OF THE MAIN-BRACKET BOTTOM PLATES.

For safety reasons, on no account should the plates be removed and not refitted after servicing.

— 19 —

(1) REMOVING THE PLATES

In the event of servicing being required to the solder side of the D Board printed circuit, the bottom plates fitted to the main chassis bracket require to be removed. This is performed by cutting the gates with a sharp wire cutter at the locations shown and indicated by arrows.

Note : There are 5 plates fitted to the main bracket and secured by 4 or 6 gates.

Only remove the necessary plate to gain access to the circuit board.

FOR SAFETY REASON THIS

PLATE MUST BE REMOUNTED

AFTER CUTTING AND

TAKING AWAY.

Fig 1

(2) REFITTING THE PLATES

Because the plates differ in size it is important that the correct plates are refitted in their original location. The plates are identified by markings A-B-C-D-E on their top side.

1. Identify the plate by locating its marking.

2. Turn the plate over noting where the marking is located.

3. Locate the corresponding marking indicated on the main chassis bracket. See Fig 2.

4. Refit the plate as indicated in Fig 3 with the markings located next to each other.

FOR SAFETY REASON THIS

PLATE MUST BE REMOUNTED

AFTER CUTTING AND

TAKING AWAY.

ATTENTION

Fig 2

FOR SAFETY REASON THIS

PLATE MUST BE REMOUNTED

AFTER CUTTING AND

TAKING AWAY.

ATTENTION

INDEX MARKING

AT BRACKET FRAME

INSERT FROM THE BOTTOM SIDE

Fig 3

MAIN BRACKET

In the event of the plates requiring to be removed at a later stage, this can be achieved by inserting a screwdriver in the snap-recess indicated as in Fig 4 and lifting out.

KV-25K1

Fig 4

KV-25K1

SECTION 3

SET -UP ADJUSTMENTS

• When complete readjustment is necessary or a new picture tube is installed, carry out the following adjustments.

• Unless there are specific instructions to the contrary, carry out these adjustment with the rated power supply.

• Unless there are specific instructions to the contrary, set the controls and switches as follows.

Contrast............ normal

Brightness ........ normal

3-1. BEAM LANDING

Preparation:

1. In order to reduce the influence of geomagnetism on the set’s

picture tube face it in an easterly or westerly direction.

2. Switch on the set’s power and degauss with the degausser.

(1) Adjustment of Correction Magnet for Y-Splitting Axis

1. Input a crosshatch signal from the pattern generator.

2. Picture control is minimum and brightness control is still

normal.

3. Position the neck assy as shown in Fig. 3-2.

4. Move the deflection yoke forward to touch the CRT and it

stands up rightly.

5. Adjust the upper pin and the lower pin symmetrically by

opening or closing the Y-splitting axis correction magnets on the neck assy.

6. Return the deflection yoke to its original position.

• Carry out the following adjustments in this order: 3-1. Beam landing 3-2. Convergence 3-3. Focus 3-4. White balance

Note:Testing equipment required.

1. Color bar/pattern generator

2. Degausser

3. Vector scope

(2) Landing

Note: Before carrying out the following adjustments adjust the

magnets as indicated below (See Fig.3-3).

1. Input an all-white signal from the pattern generator. Maximize the picture setting and adjust the brightness setting.

2. Rough-adjust the focus and horizontal convergence.

3. Loosen the deflection yoke screws, align the purity adjustment knob to the central position. (See Fig. 3-1)

4. Switch from the all-white pattern to an all-green pattern.

5. Move the deflection yoke backwards and adjust with the purity magnet so that the green is at the center and it aligns symmetrically. (See Fig. 3-4)

6. Move the deflection yoke forward and adjust so that entire screen becomes green.

7. Switch the raster signal to red, then to blue and verify the landing condition.

8. When the position of the deflection yoke has been determined, fasten the deflection yoke with the screw.

9. If the beam does not land correctly in all the corners, use magnets to correct it. (See Fig. 3-5)

Y-splitting axis correction magnet

— 20 —

Purity Adjustment

Purity

Deflection yoke

Fig.3-1

Align the bottom edge of the neck assy with the G3 hole center.

Fig.3-3

Align Pips on each magnet

Neck assy

Fig.3-2

Green

GRN

Fig.3-4

RED

Red

Blue

BLU

KV-25K1

Center dot

Purity control corrects this area.

Deflection yoke positioning corrects these areas

Fig.3-5

Disk magnets or rotatable disk magnets correct these areas (a-d).

H.STAT

convergence

control

RV3701 Screen (G2)

Magnete statico verticale

V.STAT

C Board RV3702 (H.STAT)

H.STAT convergence

• If the horizontal dots are unable to coincide with the variable range of the H.STAT convergence, adjust together with the V.STAT convergence while tracking. (Adjust the convergence by tilting the V.STAT convergence or by opening or closing the V.STAT convergence.)

(Open)

(Close)

3-2. CONVERGENCE

(1) Screen center convergence

(Static convergence)

1. Input a dot signal from the pattern generator. Normalize the picture setting.

2. (Moving horizontally), adjust the H.STAT control so that the horizontal red, green and blue dots coincide at the center of screen.

3. (Moving vertically), adjust the V.STAT magnet so that the vertical red, green and blue points coincide at the center of screen.

— 21 —

4. Movement of the red, green and blue dots by tilting the V.STAT magnet and by opening or closing the V.STAT magnet.

1 By opening or closing the V.STAT magnet, the red, green

and blue points move as shown below

B G

2By rotating the V. STAT magnet counterclockwise, the

red, green and blue dots move as shown below.

KV-25K1

3By rotating the V.STAT magnet clockwise, the red, green

and blue dots move as shown below.

4By opening or closing the V.STAT magnet, the red, green and

blue dots move as shown below.

• If the blue dot does not coincide with the red and green points, correct the points by using the BMC (Hexapole) magnet.

5Correction for HMC (horizontal mis-convergence) and VMC

(vertical mis-convergence) by using the BMC (Hexapole) magnet.

1HMC correction by BMC (Hexapole) magnet and movement

of the electronic beam.

HMC correction(A) HMC correction(B)

A < B

RG B

A > B

RGB

Layout of each control

Purity magnet BMC (Hexapole) magnet V.STAT convergence magnet

Y-splitting axis correction magnet

Fig.3-5

2. If you are unable to adjust the corner convergence properly, correct them with the use of permalloys.

a—d: angoli dello

a-d: screen-corner

schermo non in

convergence defect

convergenza.

A = B

RG B

A = B

RG B

2VMC correction by BMC (Hexapole) magnet and movement

of the electronic beam.

VMC correction(A) VMC correction(B)

C < D

C D

C = D C > D C = D

R G

— 22 —

Permalloy Assy X-4387-214-1

Convergence adjustment with permalloy

KV-25K1

3-3. Focus

1. Receive a television broadcast signal.

2. Normalize the picture setting.

3. Adjust the focus control on the flyback transformer for the best focus at the center of the screen. Bring only the center area of the screen into focus, the magenta-ring appears on the screen. In this case, adjust the focus to optimize the screen uniformly.

FOCUS

Video Proc. TDA4780

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3-4. Screen (G2), White balance

(Adjustment in the service mode with remote commander)

G2 adjustment (RV3701)

1. Input a dot signal from the pattern generator.

2. Set the Picture, Brightness and Colour to minimum.

3. Apply 170V DC from an external power supply to the R, G and B cathodes of the CRT.

4. While watching the picture, adjust the G2 control

RV3701 [ SCREEN ] on the C board to the point just before the return lines disappear.

White balance adjustment

1. Receive an all-white signal.

2. Enter into the Service Mode by pressing ' TEST ', ' TEST ' and ' MENU' on the Service Commander.

3. Select ' VIDEO PROC. ' from the on screen menu display and press OK .

4. The ' VIDEO PROC TDA4780' menu will appear on the screen.

5. Set picture to MAX.

6. Set the ' R GAIN ' to 25.

7. Adjust the ' G GAIN ' and ' B GAIN ' so that the white balance becomes optimum.

8. Press the OK button to write the data for each item.

9. Set picture to MIN.

10. Set the ' R LVL REF ' to 31.

11. Adjust ' G LVL REF ', and ' B LVL REF ' with the left and right buttons so that the white balance becomes optimum.

12. Press the OK button to write the data for each item.

— 23 —

+ 53 hidden pages