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 AMPFUSE, otherwise the circuit should be protected by a 5 AMP FUSE at the
distribution board.
ASA
T
How to replace the fuse.
Open the fuse compartment with the
screwdriver blade
and replace the fuse.
7. ELECTRICAL PARTS LIST ...............................
23
24
28
29
31
33
35
39
41
44
49
57
61
67
75
80
85
87
90
91
92
93
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
MARQUESUR 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
2-3. SERVICE POSITION
1
Five 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-29K1
2-5. A BOARD REMOVAL2-6. PICTURE TUBE REMOVAL
Push the claw of the bracket
in the direction of the arrow
and remove.
Holder DGC
7
Degaussing coil
8
Spring tension
9
KV-29K1
— 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.
a
1
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
1
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 !
2
A metal fitting called as shatter-hook terminal is built into the rubber.
3
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)
b
b
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
c
Anode button
Anode cap
Picture tube
3
13
5
10
4
Chassis
6
Speaker
2
1
Two Screws
14
Neck Assy
11
Deflection
12
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
D
E
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-29K1
Fig 4
KV-29K1
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-29K1
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
R
B
G
R
2By rotating the V. STAT magnet counterclockwise, the
red, green and blue dots move as shown below.
B
GR
KV-29K1
3By rotating the V.STAT magnet clockwise, the red, green
and blue dots move as shown below.
B
GR
4By opening or closing the V.STAT magnet, the red, green and
blue dots move as shown below.
R
G
B
G
B
R
• 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
2. If you are unable to adjust the corner convergence properly,
correct them with the use of permalloys.
a
a—d: angoli dello
a-d: screen-corner
schermo non in
convergence defect
convergenza.
c
c
b
d
d
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 = DC > DC = D
R
G
B
R
C
G
D
B
R
G
B
R
G
B
— 22 —
b
Permalloy Assy
X-4387-214-1
Convergence adjustment with permalloy
a
d
c
KV-29K1
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.