Sony TRINITRON KV-J25MF8J User manual

MODEL COMMANDER DEST. CHASSIS NO.
KV-J25MF8J RM-873 ME SCC-K57P-A
MODEL COMMANDER DEST. CHASSIS NO.
KV-J29MF8J RM-873 ME SCC-K57N-A
CHASSIS
TRINITRON ® COLOR TV
BG-1L
SERVICE MANUAL

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Note
Power requirements 110-240 VAC, 50/60 Hz
Power consumption (W) Indicated on the rear of the TV
Television system B/G, I, D/K, M
Color system PAL, PAL 60, SECAM, NTSC4.43, NTSC3.58
Channel coverage
B/G VHF: E2 to E12 / UHF: E21 to E69 / CATV: S01 to S03, S1 to S41
IUHF: B21 to B68 / CATV: S01 to S03, S1 to S41
D/K VHF: C1 to C12, R1 to R12 / UHF: C13 to C57, R21 to R60
CATV: Z1 to Z39, S01 to S03, S1 to S41
MVHF:A2 to A13 / UHF: A14 toA79 /
CATV: A-8 to A-2, A to W+4, W+6 to W+84
Antenna 75-ohm external terminal
Audio output (speaker) 6W + 6W
Number of terminal
Video Input: 3 Output:1 Phono jacks; 1 Vp-p, 75 ohms
Audio Input: 3 Output: 1 Phono jacks; 500 mVrms
S Video Input: 1 Y : 1 Vp-p, 75 ohms,
unbalanced, sync negative
C : 0.286 Vp-p, 75 ohms
Headphone Output: 1 Minijack
Picture tube Super Trinitron Super Trinitron Plus
(25 in.) (29 in.)
Tube size (cm) 64 72 Measured diagonally
Screen size (cm) 60 68 Measured diagonally
Dimension (w/h/d, mm) 712 ×521 ×520 780 ×577 ×542
Mass (kg) 33 43
Accessory (optional) TV stand (SU-25H) TV stand (SU-29H)
SPECIFICATIONS
CAUTION
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.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY SHADING AND MARK !
ON THE SCHEMATIC DIAGRAMS, EXPLODED VIEWS AND
IN THE PARTS LISTARE CRITICALTO SAFE OPERATION.
REPLACE THESE COMPONENTS WITH SONY PARTS
WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS
MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.
KV-J25MF8J KV-J29MF8J
Design and specifications are subject to change without notice.

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TABLE OF CONTENTS
Section Title Page
1. GENERAL........................................................................ 4
2. DISASSEMBLY
2-1. Rear Cover Removal................................................ 11
2-2. Speaker Removal ..................................................... 11
2-3. ChassisAssy Removal ............................................. 11
2-4. Service Position ....................................................... 12
2-5. S1 Board Removal ................................................... 12
2-6. A and D Boards Removal ........................................ 12
2-7. F1 and H3 Boards Removal..................................... 13
2-8. Picture Tube Removal.............................................. 13
3. SET-UP ADJUSTMENTS
3-1. Beam Landing.......................................................... 15
3-2. Convergence............................................................. 16
3-3. FocusAdjustment .................................................... 19
3-4. G2 (Screen) and White BalanceAdjustments......... 20
4. SELF DIAGNOSIS FUNCTION................................ 21
5. CIRCUIT ADJUSTMENT
5-1. Adjustments with Commander ................................ 22
5-2. Adjustment Method ................................................. 23
5-3. Picture Quality Adjustment ..................................... 27
5-4. A Board Adjustment ................................................ 27
5-5. ABoardAdjustyment After IC003 (Memory)
Replacement............................................................. 28
5-6. Picture Distortion Adjustment ................................. 28
Section Title Page
6. DIAGRAMS
6-1. Block Diagram ......................................................... 29
6-2. Frame Schematic Diagram ...................................... 31
6-3 Circuit Boards Location .......................................... 34
6-4. Schematic Diagrams and Printed Wiring Boards.... 34
(1) Schematic Diagrams of D, F1 and H3 Boards ........ 35
(2) Schematic Diagram of A Board............................... 43
(3) Schematic Diagram of S1 Board ............................. 50
(4) Schematic Diagram of C2 Board ............................ 53
(5) Schematic Diagrams of VM Board ......................... 55
6-5. Semiconductors........................................................ 57
7. EXPLODED VIEWS
7-1. Picture Tube ............................................................. 59
7-2. Chassis ..................................................................... 60
8. ELECTRICAL PARTS LIST....................................... 61

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SECTION 1
GENERAL The operating instructions mentioned here are partial abstracts from
the Operating Instruction Manual. The page numbers of the
Operating Instruction Manual remain as in the manual.

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SECTION 2
DISASSEMBLY
2-3. CHASSIS ASSY REMOVAL
2-1. REAR COVER REMOVAL
2Rear cover
1Two screws
(+BVTP4x16)
1Six screws
(+BVTP4x16)
1Two screws
(+BVTP4x16)
1Two claws
2Chassis assy
2-2. SPEAKER REMOVAL
1Two screws
(+BVTP4 x16)
3Speaker (5cm)
2Bracket (R) assy,sp
[KV-J29MF8J]

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When measuring the power supply voltage,
just remove a part of bracket shown below.
1PCB holder
2Chassis assy

2Two screws
(+BVTP3 x 8)
(7-685-646-71)
Cut the four marked sections
with a nippers to remove a
part of bracket.
1
For safety reason this plate
must be remounted after
cutting and taking away.
2
ATTENTION
SAFETY REQUIREMENT
1
2-6. A AND D BOARDS REMOVAL
7D board
1Four
connectors
4A Board
3Three
claws
6Four claws
2Five screws
(+BVTP3 x12)
5Two screws
(+BVTP3 x12)
2-5. S1 BOARD REMOVAL
2-4. SERVICE POSITION
4S1 Board
2One claw
3PCB holder
1Screw
(+BVTP3x12)

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2-7. F1 AND H3 BOARDS REMOVAL
2-8. PICTURE TUBE REOVAL
1Two screws
(+BVTP4 x16)
1Two screws
(+BVTP4 x16)
$Two screws
(Tapping 7+Crown
Washer)
$Two screws
(Tapping 7+Crown
Washer)
@DGC
!DGC clip
[KV-J29MF8J]
9Two DGC band
6C2 Board
0Two DGC holder
[KV-J29MF8J]
0Two DGC holder
!DGC clip
7Neck assy
@DGC
8Deflection yoke
#Tension spring
4Anode cap
Cushion
2Speaker
bracket(L)assy
2Speaker
bracket(R)assy
3Speaker (5cm)
3Speaker (5cm)
%Picture tube
5Chassis assy
[KV-J29MF8J]
[KV-J29MF8J ]
[KV-J25MF8J]
1Two connector
5connector
6connector
4Two Flat
cables
2Two
claws
8H3 Board
7Two claws
3F1 Board

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• 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
1Turn up one side of the rubber cap in the direction
indicated by the arrow a.
b
b
2Usingathumbpulluptherubbercap firmly in the direction
indicated by the arrow b.
Anode button
c
3When 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 up it in the direction of the
arrow c.
• HOW TO HANDLE AN ANODE-CAP
1Don't hurt the surface of anode-caps with sharp shaped
material!
2Don't press the rubber hardly not to hurt inside of anode-
caps! A material fitting called as shatter-hook terminal
is built in the rubber.
3Don't turn the foot of rubber over hardly! The shatter-
hook terminal will stick out or hurt the rubber.

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SECTION 3
SET-UP ADJUSTMENTS
.................................................................................................................................................................................................................................
}normal
Fig. 3-1
G2G1 G3
Behind the G1 edge
Neck assy
Fig. 3-2
Green
Red
Blue
Fig. 3-3
Disk magnets or rotatable
disk magnets correct these
areas (a-b).
ab
cd
c
b
a
d
Deflection yoke positioning
corrects these areas.
Fig. 3-4
•The following adjustments should be made when a complete
realignment is required or a new picture tube is installed.
•These adjustments should be performed with rated power
supply voltage unless otherwise noted.
Controls and switch should be set as follows unless otherwise noted:
PICTURE control.......................................................... RESET
BRIGHTNESS control............................................... CENTER
Preparations :
•In order to reduce the influence of geomagnetism on the set's
picture tube, face it east or west.
•Switch on the set's power and degauss with the degausser.
3-1. BEAM LANDING
1. Input a white signal with the pattern generator.
Contrast
Brightness
2. Position neck ass'y as shown in Fig3-2.
3. Set the pattern generator raster signal to a red raster.
4. Move the deflection yoke to the rear and adjust with the purity
control so that the red is at the center and the blue and the green
take up equally sized areas on each side.
(See Figures 3-1 through 3-3.)
5. Move the deflection yoke forward and adjust so that the entire
screen is red. (See Figure 3-1.)
6. Switch the raster signal to blue, then to green and verify the
condition.
7. When the position of the deflection yoke has been decided,
fasten the deflection yoke with the screws and DY spacers.
8. If the beam does not land correctly in all the corners, use a
magnet to adjust it.
(See Figure 3-4.)
Perform the adjustments in order as follows :
1. Beam Landing
2. Convergence
3. Focus
4. White Balance
Note : Test Equipment Required.
1. Color-bar/Pattern Generator
2. Degausser
3. Oscilloscope
Purity control
corrects this area.

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3-2. CONVERGENCE
Preparations :
•Before starting this adjustment, adjust the focus, horizontal size
and vertical size.
•Minimize the brightness setting.
•Provide dot pattern.
(1) Horizontal and Vertical Static Convergence
1. (Moving horizontally), adjust the H.STAT control so that the
red, green and blue points are on top of each other at the center
of the screen.
2. (Moving vertically), adjust the V.STAT magnet so that the red,
green and blue points are on top of each other at the center of
the screen.
3. If the H.STAT variable resistor cannot bring the red, green and
blue points together at the center of the screen, adjust the hori-
zontal convergence with the H.STAT variable resistor and the
V.STAT magnet in the manner given below.
(In this case, the H.STAT variable resistor and the V.STAT
magnet influence each other.)
B
R
B
R
ab
bb
a
b
a
b
a
R
G
B
b
B
G
R
b
ba
a
1
2
3
GG
B G R
R G B
H. STAT V. STAT
Magnet
Center dot
R G B
R
G
B
RV702
H. STAT
RV701
SCREEN (G2)
C Board
•Tilt the V.STAT magnet and adjust the static convergence by
opening or closing the V.STAT magnet.
If the V.STAT magnet is moved in the direction of the aand
barrows, the red, green, and blue points move as shown
below.

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•Use the H.STAT VR to adjust the red, green, and blue dots so
that they coincide at the center of screen.
The respective dot position resulting from moving each
magnet interact, so be sure to perform adjustment while
tracking.
RG B RGB R GB
RGB RGB
RGB
VM Board
VM Board
BLUE Paint
RED Paint
RED Paint
BLUE Paint
•Operation of BMC (Hexapole) Magnet
If the red, green and blue dots are not balanced or aligned, then
use the BMC magnet to adjust in the manner described below.
1Y separation axis correction magnet adjustment receive the
cross-hatch signal and adjust [PICTURE] to [MIN] and
[BRIGHTNESS] to [STANDARD] .
2 Adjust the Y separation axis correction magnet on the neck
assembly so that the horizontal lines at the top and bottom of
the screen are straight.
Note 1) The Red and Blue magnets should be equally far from
the horizontal center line.
2) Do not seperate the Red and Blue magnets too far.
(Less than 8 mm)

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(2) Dynamic Convergence Adjustment
Preparation:
•Before starting this adjustment, adjust the horizontal static
convergence and the vertical static convergence
1. Slightly loosen the deflection yoke screws.
2. Remove the deflection yoke spacer.
(3) Screen-corner Convergence
ba
d
c
a-b:scrren-corner
misconvergence
R G B
B G R
R G B
B G R
R G B B G R
R
G
B
B
G
R
B
G
R
R
G
B
B G R R G B
3. Move the deflection yoke as shown in the figure below and
optimize the convergence.
4. Tighten the deflection yoke screws.
5. Install the deflection yoke spacer.
Affix a Permalloy assy corresponding to the misconverged
areas.
b
a
d
c
Permalloy assembly


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FLYBACK TRANSFORMER (T801)
Focus
3-3. FOCUS ADJUSTMENT
Adjust FOCUS control on the flyback transformer for the best
focus.
Item
number
37
39
3A
3B
3C
Adjustment
item
SBR
GDR
BDR
GCF
BCF
Note
SUB-
BRIGHTNESS
G. Drive
B. Drive
G. CUT-OFF
B. CUT-OFF
Standard DATA
1F
2C
2C
07
07
b. METHOD OF CANCELLATION FROM SERVICE
MODE
Set the standby condition (Press POWER button on the
commander), then press POWER button again, hereupon it be-
comes TV mode.
c. METHOD OF WRITE FOR MEMORY
1) Set to Service Mode.
2) Press 1(UP) and 4(DOWN), select an item of adjustments.
3) Press MUTING button indicate WRITE (RED) on screen.
4) Press `ºbutton to write into memory.
a. AN ITEM OF ADJUSTMENT
d. MEMORY WRITE CONFIRMATION METHOD
1) After adjustment, pull out the plug from AC outlet, and then
plug into AC outlet again.
2) Turn the power switch ON and set to Service Mode.
3) Call the adjusted items again to confirm adjustments were made.
SERVICE
MUTING
07
DATA
LCP
Adjustment Item
09
Item number
WRITE07LCP09
0
Executes the writing

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.
3-4. G2 (SCREEN) AND WHITE BALANCE
ADJUSTMENTS
1. G2 (SCREEN) ADJUSTMENT (RV701)
1) Set the PICTURE and BRIGHTNESS to normal.
2) Put to VIDEO input mode without signals.
3) Set to Service Mode.
4) Change BLU data of the item number 8C from 01 to 00 .
(To turn off Blue Back.)
5) Press MUTING , and `0to write the data in the memory.
6) Connect R, G, and B of the C board cathode to the oscillo-
scope.
7) Adjust G2 (RV701) volume to the value below.
8) Re-set BLU data of the item number 8C from 00 back to 01
9) Press MUTING , and 0 to write the data in the memory.
2. WHITE BALANCE ADJUSTMENTS
1) Set to service Mode.
2) Input white raster signal.
3) Set the PICTURE to minimum.
4) Select SBR(35) with 1and 4, and then set the level to
minimum with 3and 6.
5) Select GCF(39) and BCF(3A) with 1and 4. And adjust
the level with 3and 6for the best white balance.
6) Set the PICTURE to maximum.
7) Select GDR(37) and BDR (38) with 1and 4, and adjust the
level with 3and 6for the best white balance.
8) Write into the memory by pressing MUTING then 0 .
170V ±2(VDC)
0V
170 V ±2(VDC)
3. SUB BRIGHT ADJUSTMENT
1) Set to service mode.
2) Input a staircase signal of black and white from the pattern
generator.
3) BRIGHTNESS....RESET.
PICTURE ............minimum
4) Select SBR(55) with 1and 4, and adjust SBR level with
3and 6so that the stripe second from the right is dimly lit.
White
Black
second from the right