MODEL
COMMANDER DEST.
CHASSIS NO.
KV-T21MN8
RM-870 Hong Kong
SCC-J16G-A
KV-T21MN81 RM-870 GE
SCC-J40V-A
SERVICE MANUAL
MODEL
COMMANDER DEST. CHASSIS NO.
TRINITRON ® COLOR TV
BG-1S CHASSIS
2
KV-T21MN8/T21MN81
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, I, D/K, M
Color system
PAL, PAL 60, SECAM, NTSC4.43, NTSC3.58
Stereo system
Nicam Stereo B/G, I; A2 Stereo (German) B/G
Teletext language
English, German, Swedish, Italian, French, Spanish
KV-T21MN81 only
Channel coverage
B/G
VHF: E2 to E12 / UHF: E21 to E69 / CATV: S01 to S03, S1 to S41
I
UHF: 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: S01 to S03, S1 to S41, Z1 to Z39
M
VHF: A2 to A13 / UHF: A14 to A79 /
CATV: A-8 to A-2, A to W+ 4, W+ 6 to W+ 84
Audio output (speaker)
3W
× 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
21 in.
Tube size (cm)
54
Measured diagonally
Screen size (cm)
51
Measured diagonally
Dimensions (w/h/d, mm) 527
× 464 × 471
Mass (kg)
22
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 VIEWS AND IN THE
PARTS LIST ARE CRITICAL TO SAFE OPERATION. REPLACE
THESE COMPONENTS WITH SONY PARTS WHOSE PART
NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN
SUPPLEMENTS PUBLISHED BY SONY.
3
KV-T21MN8/T21MN81
RM-870
TABLE OF CONTENTS
1. GENERAL ....................................................................
4
2. DISASSEMBLY
2-1.
Rear Cover Removal ...........................................
10
2-2.
A Board Removal ................................................
10
2-3.
F1 Board Removal ...............................................
10
2-4.
Service Position ...................................................
10
2-5.
Replacement of Parts ...........................................
11
2-6.
Demagnetization Coil Removal ..........................
11
2-7.
Picture Tube Removal .........................................
12
3. SET-UP ADJUSTMENTS
3-1.
Beam Landing ......................................................
13
3-2.
Convergence ........................................................
14
3-3.
Focus Adjustment ................................................
16
3-4.
G2 (Screen) and White Balance Adjustments .....
16
4. SELF DIAGNOSIS FUNCTION .............................
17
5. CIRCUIT ADJUSTMENTS
5-1.
Adjustments with Commander ............................
18
5-2.
Adjustment Method .............................................
19
5-3.
A Board Adjustment after IC003 (Memory)
Replacement .........................................................
23
5-4.
Picture Distortion Adjustment .............................
23
6. DIAGRAMS
6-1.
Block Diagram ......................................................
25
6-2.
Circuit Boards Location .......................................
29
6-3.
Schematic Diagrams and Printed Wiring Boards.
29
(1)
Schematic Diagram of A Board ............................
33
(2)
Schematic Diagrams of A3, F1 and V1 Boards ...
37
(3)
Schematic Diagrams of C and VM Boards ..........
44
6-4.
Semiconductors .....................................................
49
7. EXPLODED VIEW
7-1.
Chassis ..................................................................
51
8. ELECTRICAL PARTS LIST ....................................
53
Section
Title
Page
Section
Title
Page
4
KV
-T21MN8/T21MN81
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
B/G
I
D/K
M
TV SYSTEM
AUTO PROGR
TV SYSTEM
AUTO PROGR
5
KV
-T21MN8/T21MN81
RM-870
Getting Started
4-EN
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
output
VCR
VIDEO IN
: Signal flow
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
Rear of TV
VIDEO
IN
MONITOR
OUT
VIDEO
L (MONO)
AUDIO
R
to antenna socket
When connecting a monaural VCR
Connect the yellow plug to VIDEO and the black
plug to AUDIO-L (MONO).
Getting Started
5-EN
Front of TV
Connecting audio/video equipment using MONITOR OUT jacks
to antenna
socket
Rear of TV
to antenna
output
to video
and audio
inputs
: Signal flow
or
VCR
Audio system
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.
VIDEO
IN
MONITOR
OUT
VIDEO
L (MONO)
AUDIO
R
VIDEO
L (MONO)
VIDEO INPUT
AUDIO
R
MONITOR OUT
EN
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.
: Signal
flow
Camcorder
to video and
audio outputs