Sony TRINITRON KV-T25SZ8 User manual

MODEL COMMANDER DEST. CHASSIS NO.
KV-T25SZ8 RM-870 Australia SCC-J99F-A
SERVICE MANUAL
MODEL COMMANDER DEST. CHASSIS NO.
TRINITRON ® COLOR TV
BG-1S CHASSIS

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KV-T25SZ8
RM-870
SPECIFICATIONS
Note
Power requirements 110-240 V AC, 50/60 Hz
Power consumption (W) Indicated on the rear of the TV
Television system B/G
Color system PAL, PAL 60, NTSC4.43, NTSC3.58(AV IN)
Stereo system A2 Stereo (German) B/G
Channel coverage VHF: 0 to 12, 5A, 9A / UHF: 28 to 69 / CATV: S01 to S03, S1 to S41
Audio output (speaker) 5W ×2
Inputs Antenna: 75 ohms
VIDEO IN jacks: phono jacks
Video: 1 Vp-p, 75 ohms
Audio: 500 mVrms, high impedance
Outputs Headphone jack: minijack
MONITOR OUT jacks: phono jacks
Video: 1 Vp-p, 75 ohms
Audio: 500 mVrms
Picture tube 25 in.
Tube size (cm) 64 Measured diagonally
Screen size (cm) 60 Measured diagonally
Dimensions (w/h/d, mm) 613 ×542 ×472
Mass (kg) 32
Design and specifications are subject to change without notice.
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 VIEWSAND IN THE
PARTS LIST ARE CRITICALTO SAFE OPERATION. REPLACE
THESE COMPONENTS WITH SONY PARTS WHOSE PART
NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN
SUPPLEMENTS PUBLISHED BY SONY.

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KV-T25SZ8
RM-870
TABLE OF CONTENTS
1. GENERAL.................................................................... 4
2. DISASSEMBLY
2-1. Rear Cover Removal............................................ 9
2-2. A Board Removal ................................................ 9
2-3. F1 Board Removal ............................................... 9
2-4. Service Position ................................................... 9
2-5. Replacement of Parts ........................................... 10
2-6. Demagnetization Coil Removal .......................... 10
2-7. Picture Tube Removal.......................................... 11
3. SET-UP ADJUSTMENTS
3-1. Beam Landing ...................................................... 12
3-2. Convergence......................................................... 13
3-3. Focus Adjustment ................................................ 15
3-4. G2 (Screen) and White Balance Adjustments ..... 15
4. SELF DIAGNOSIS FUNCTION............................. 16
5. CIRCUIT ADJUSTMENTS
5-1. Adjustments with Commander ............................ 17
5-2. Adjustment Method ............................................. 18
5-3. A Board Adjustment after IC003 (Memory)
Replacement......................................................... 21
5-4. Picture Distortion Adjustment ............................. 21
6. DIAGRAMS
6-1. Block Diagram ...................................................... 23
6-2. Circuit Boards Location ....................................... 27
6-3. Schematic Diagrams and Printed Wiring Boards. 27
(1) Schematic Diagram of A Board............................ 31
(2) Schematic Diagrams of A3, F1, C and
VM Boards............................................................ 35
6-4. Semiconductors..................................................... 43
7. EXPLODED VIEW
7-1. Chassis .................................................................. 45
8. ELECTRICAL PARTS LIST.................................... 47
Section Title Page Section Title Page

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KV-T25SZ8
RM-870
SECTION 1
GENERAL
The operating instructions mentioned here are partial abstracts from the
Operating Instructions Manual. The page numbers of the Operating
Instruction Manual remain as in this manual.
2
3
AUTO PROGR
AUTO PROGR

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KV-T25SZ8
RM-870
Getting Started
4
Connections
Connecting a VHF antenna or a combination VHF/UHF antenna
— 75-ohm coaxial cable (round)
Attach an optional IEC antenna connector to the 75-ohm coaxial cable.
Plug the connector into the (antenna) socket at the rear of the TV.
Rear of TV
or
On a wall
Rear of TV
Getting Started
to video
and audio
outputs
to antenna socket
to antenna
output VCR
VIDEO IN
: Signal flow
Rear of TV
VIDEO
IN
MONITOR
OUT
VIDEO
L
(MONO)
AUDIO
R
Connecting optional equipment
You can connect optional audio/video equipment to your TV such as a VCR, multi disc player, camcorder, video
game or stereo system.
Connecting video equipment using video input jacks
When connecting a monaural VCR
Connect the yellow plug to VIDEO and the black
plug to AUDIO-L (MONO).
Getting Started
5
Front of TV
EN
When using the video input jacks
Do not connect video equipment to the video input jacks at the front and the rear of your TV simultaneously; otherwise the picture will
not be displayed properly on the screen.
to video and
audio outputs
to antenna
socket
MONITOR OUT
Rear of TV
to antenna
output
to video
and audio
inputs
: Signal flow
or
VCR
Audio system
VIDEO
IN
MONITOR
OUT
VIDEO
L
(MONO)
AUDIO
R
Connecting audio/video equipment using MONITOR OUT jacks
VIDEO L (MONO)
VIDEO INPUT
AUDIO
R
: Signal flow
Camcorder
When recording through the MONITOR OUT jacks
If you change the channel or video input while recording with a VCR, the channel or video input you are recording also will be changed.
CAUTION
Do not connect the power cord until you have completed making all other connections; otherwise a minimum leakage
current might flow through the antenna and other terminals to ground.