SONY KV-B14K3 SERVICE MANUAL
SERVICE MANUAL
G3E(D
)
CHASSIS
MODEL COMMANDER DEST. CHASSIS NO.
KV-B14K3
RM-849S Vietnam SCC-H37J-A
MODEL COMMANDER DEST. CHASSIS NO.
TRINITRON
®
COLOR TV
KV -B14K3
RM-849S
Power requirements 110-240 V AC, 50/60 Hz
Power consumption (W) Indicated on the rear of the TV
Television system B/G, D/K
Color system PAL, PAL 60, NTSC4.43, NTSC3.58 (AV IN)
Channel coverage
B/G VHF: E2 to E12/UHF: E21 to E69/CATV: S01 to S03, S1 to S20
D/K VHF: R1 to R12/UHF: R21 to R60/CATV: S01 to S03, S1 to S20 to Z39
Audio output (speaker) 5W
Inputs Antenna: 75 ohms
Outputs Headphone jack: minijack
Picture tube 14 in.
Tube size (cm) 37 Measured diagonally
Screen size (cm) 34 Measured diagonally
Dimensions (w/h/d, mm) 422 × 350 × 406
Mass (kg) 12
SPECIFICATIONS
Note
VIDEO IN jacks: phono jacks
Video: 1 Vp-p, 75 ohms
Audio: 500 mVrms, high impedance
MONITOR OUT jacks: phono jacks
Video: 1 Vp-p, 75 ohms
Audio: 500 mVrms
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.
Design and specifications are subject to change without notice.
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.
– 2 –
KV -B14K3
TABLE OF CONTENTS
Section Title Page Section Title Page
RM-849S
1. GENERAL .................................................................... 4
2. DISASSEMBLY
2-1. Rear Cover Removal............................................ 8
2-2. Service Position ................................................... 8
2-3. Picture Tube Removal.......................................... 8
3. SET-UP ADJUSTMENTS
3-1. Beam Landing...................................................... 10
3-2. Convergence......................................................... 11
3-3. Focus Adjustment ................................................ 13
3-4. Screen (G2) and White Balance Adjustments..... 13
4. CIRCUIT ADJUSTMENTS
4-1. A Board Adjustments........................................... 14
5. DIAGRAMS
5-1. Block Diagrams .................................................... 17
5-2. Circuit Boards Location ....................................... 21
5-3. Schematic Diagrams and Printed Wiring Boards
(1) Schematic Diagram of A Board...................... 25
(2) Schematic Diagram of C Board...................... 29
5-4. Semiconductors..................................................... 31
6. EXPLODED VIEW
6-1. Chassis .................................................................. 33
7. ELECTRICAL PARTS LIST.................................... 34
– 3 –
SECTION 2
A board
1 Two screws
(BVTP 4×16)
3 Two washer head screws
(BVTP 4×16)
0 Four tapping
screws (5)
4 Speaker
block (L)
2 Speaker
block (R)
9 Tension spring
!™ Degaussing coil
7 C board
5 Anode cap
Cushion
8 Deflection yoke
!¡ Picture tube
6 A board
2
Two screws
(BVTP 4×16)
3
One screw
(BVTP 3×12)
1
Two screws
(BVTP 4×16)
4
One screw
(BVTP 3×12)
DISASSEMBLY
KV -B14K3
RM-849S
2-1. REAR COVER REMOVAL
– 8 –
2-2. SERVICE POSITION
2-3. PICTURE TUBE REMOVAL
•REMOVAL OF ANODE-CAP
a
a
b
b
c
Anode button
NOTE : After removing the anode, short circuit the anode of the picture tube and the
anode cap to the metal chassis, CRT shield or carbon paint on the CR T.
•REMOVING PROCEDURES
1 Turn up one side of the rubber cap in the direction indicated by the arrow a
– 9 –
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 Do not damage the surface of the anode-cap with sharp shaped objects.
2 Do not press the rubber too hard so as not to damage inside of anode-cap.
A metal fitting called the shatter-hook terminal is built into the rubber.
3 Do not turn the foot of rubber over too hard.
The shatter-hook terminal will stick out or damage the rubber.
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
KV -B14K3
RM-849S
KV -B14K3
GREEN
BLUE RED
Purity control
RM-849S
SECTION 3
SET-UP ADJUSTMENTS
• 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.
Perform the adjustments in the following order :
1. Beam Landing
2. Convergence
3. Focus
4. Screen (G2) and White Balance
Controls and switch should be set as follows unless otherwise noted:
PICTURE control........................................................... normal
BRIGHTNESS control................................................... normal
Note : Test Equipment Required :
1. Color-bar/Pattern Generator
2. Degausser
3. DC Power Supply
.................................................................................................................................................................................................................................
4. Digital Multimeter
Preparation :
• Feed in the white pattern signal.
• Before starting, degauss the entire screen.
3-1. BEAM LANDING
1. Input a raster signal with the pattern generator.
2. Loosen the deflection yoke mounting screw, and set the purity
control to the center as shown in Fig. 2.
3. Turn the raster signal of the pattern generator to green.
4. Move the deflection yoke backward, and adjust with the purity
control so that green is in the center and red and blue are at the
sides evenly. (Fig. 1 through 3.)
5. Move the deflection yoke forward and adjust so that the entire
screen becomes green. (Fig. 1.)
6. Switch over the raster signal to red and blue and confirm the
condition.
7. When the position of the deflection yoke is determined, tighten
it with the deflection yoke mounting screw.
8. When landing at the corner is not right, adjust by using the disk
magnets. (Fig. 4.)
Purity control corrects
this area.
a
b
Fig. 2
Fig. 3
Disk magnets or rotatable
disk magnets correct
these areas (a-d).
Fig. 1
– 10 –
c
Deflection yoke positioning
corrects these areas.
b
d
d
Fig. 3-4
a
c
Loading...