Sony KV-21FA240 Service Manual ▷ View online
KV-21FA240
KV-21FA240
3
TABLE OF CONTENTS
SECTION TITLE
PAGE
SECTION TITLE
PAGE
Specifications ........................................................................... 4
Warnings and Cautions ............................................................ 5
Safety Check-Out ..................................................................... 6
Self-Diagnostic Function .......................................................... 7
Warnings and Cautions ............................................................ 5
Safety Check-Out ..................................................................... 6
Self-Diagnostic Function .......................................................... 7
SECTION 1: DISASSEMBLY ................................................................. 9
1-1. Rear Cover Removal ........................................................ 9
1-2. Chassis Assembly Removal ............................................. 9
1-3. Service Position .............................................................. 10
1-4. Picture Tube Removal .....................................................11
1-2. Chassis Assembly Removal ............................................. 9
1-3. Service Position .............................................................. 10
1-4. Picture Tube Removal .....................................................11
Anode Cap Removal Procedure ......................................11
SECTION 2: SET-UP ADJUSTMENTS ................................................ 12
2-1. Beam Landing ................................................................ 12
2-2. Convergence .................................................................. 13
2-3. Focus .............................................................................. 14
2-4. Screen (G2) .................................................................... 15
2-2. Convergence .................................................................. 13
2-3. Focus .............................................................................. 14
2-4. Screen (G2) .................................................................... 15
SECTION 3: CIRCUIT ADJUSTMENTS .............................................. 16
3-1. Remote Adjustment Buttons and Indicators ................... 16
3-2. Accessing the Service Menu Mode ................................ 17
3-3. Confirming Service Adjustment Changes ....................... 18
3-4. White Balance Adjustments ............................................ 18
3-5. Picture Quality Adjustments ........................................... 18
PAL 50Hz Normal Mode ......................................................... 19
3-2. Accessing the Service Menu Mode ................................ 17
3-3. Confirming Service Adjustment Changes ....................... 18
3-4. White Balance Adjustments ............................................ 18
3-5. Picture Quality Adjustments ........................................... 18
PAL 50Hz Normal Mode ......................................................... 19
SECTION 4: DIAGRAMS ..................................................................... 35
4-1. Circuit Boards Location .................................................. 35
4-2. Printed Wiring Board and
4-2. Printed Wiring Board and
Schematic Diagram Information ..................................... 35
4-3. Block Diagrams and Schematics .................................... 36
Signal Flow Block Diagram ............................................ 36
4-4. Schematics and Supporting Information ........................ 37
A Board Schematic Diagram (1 of 6) ............................. 37
A Board Schematic Diagram (2 of 6) ............................. 38
A Board Schematic Diagram (3 of 6) ............................. 39
A Board Schematic Diagram (4 of 6) ............................. 40
A Board Schematic Diagram (5 of 6) ............................. 41
A Board Schematic Diagram (6 of 6) ............................. 42
C Board Schematic Diagram ......................................... 44
J Board Schematic Diagram .......................................... 46
A Board Schematic Diagram (2 of 6) ............................. 38
A Board Schematic Diagram (3 of 6) ............................. 39
A Board Schematic Diagram (4 of 6) ............................. 40
A Board Schematic Diagram (5 of 6) ............................. 41
A Board Schematic Diagram (6 of 6) ............................. 42
C Board Schematic Diagram ......................................... 44
J Board Schematic Diagram .......................................... 46
4-5. Semiconductors .............................................................. 47
SECTION 5: EXPLODED VIEWS ........................................................ 48
5-1. Picture Tube ................................................................... 48
5-2. Chassis ........................................................................... 49
5-2. Chassis ........................................................................... 49
SECTION 6: ELECTRICAL PARTS LIST ............................................ 50
KV-21FA240
KV-21FA240
4
SPECIFICATIONS
1) 1 Vp-p 75 ohms unbalanced, sync negative
2) Y: 1.0 Vp-p, 75 ohms, sync negative; PB: 0.7 Vp-p, 75 ohms;
PR Vp-p, 75 ohms.
3) 500
mVrms (100% modulation), Impedance: 47 kilohms
4) This specifi cation is the maximum wattage.
Design and specifi cations are subject to change without notice.
Manufactured under license from Dolby
Laboratories Licensing Corporation. Dolby
and the double-D symbol are trademarks of
Dolby Laboratories.
Laboratories Licensing Corporation. Dolby
and the double-D symbol are trademarks of
Dolby Laboratories.
As an ENERGY STAR® Partner, Sony
Corporation has determined that this
product meets the ENERGY STAR®
guidelines for energy efficiency. ENERGY
STAR® is a U.S. registered mark.
SRS and the ( )® symbol are trademarks of
SRS Labs, Inc.
Manufactured under license from BBE Sound,
Inc. Licensed by BBE Sound, Inc. under USP
4638258, 5510752 and 5736897. BBE and BBE
symbol are registered trademarks of BBE
Sound, Inc.
Sound, Inc.
WEGA, FD Trinitron and Steady Sound are registered
trademarks of Sony Corporation.
KV-21FA240
Power Requirements
110-220V, 50/60Hz
Number of Inputs/Outputs
Video
1)
2
Y,P
B
, P
R
2)
1
Audio
3)
3
RF
4)
1
Speaker Output (W)
4W x 2, 12W
Power Consumption (W)
In Use (Max)
115W
In Standby (Max)
5)
<1W
Dimensions (W x H x D)
25
1/2
x21x20
7/8
mm
647 x 533 x 530 mm
Mass
62 lbs. 61 oz.
kg
28.4 kg
Television system
PAL-M/PAL-N/NTSC
Channel coverage
VHF: 2-13/UHF: 14-69/CATV: 1-125
Antenna
75-ohm external antenna terminal for VHF/UHF
Picture tube
FD Trinitron
®
tube
Visible screen size
20-inch picture measured diagonally
Actual screen size
21-inch measured diagonally
Supplied Accessories
Remote Commander RM-YA005
Two Size AA (R6) Batteries
Two Size AA (R6) Batteries
KV-21FA240
KV-21FA240
5
WARNINGS AND CAUTIONS
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.
WARNING!!
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. Circuit adjustments that are critical for safe operation are identified in this manual. Follow these procedures whenever critical
components are replaced or improper operation is suspected.
KV-21FA240
KV-21FA240
6
SAFETY CHECK-OUT
After correcting the original service problem, perform the following
safety checks before releasing the set to the customer:
1. Check the area of your repair for unsoldered or poorly soldered
connections. Check the entire board surface for solder splashes and
bridges.
2. Check the interboard wiring to ensure that no wires are “pinched” or
touching high-wattage resistors.
3. Check that all control knobs, shields, covers, ground straps, and
mounting hardware have been replaced. Be absolutely certain that
you have replaced all the insulators.
4. Look for unauthorized replacement parts, particularly transistors,
that were installed during a previous repair. Point them out to the
customer and recommend their replacement.
5. Look for parts which, though functioning, show obvious signs of
deterioration. Point them out to the customer and recommend their
replacement.
6. Check the line cords for cracks and abrasion. Recommend the
replacement of any such line cord to the customer.
7. Check the B+ and HV to see if they are specified values. Make sure
your instruments are accurate; be suspicious of your HV meter if
sets always have low HV.
8. Check the antenna terminals, metal trim, “metallized” knobs,
screws, and all other exposed metal parts for AC leakage. Check
leakage as described below.
Leakage Test
The AC leakage from any exposed metal part to earth ground and from
all exposed metal parts to any exposed metal part having a return to
chassis, must not exceed 0.5 mA (500 microamperes). Leakage current
can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA
WT-540A. Follow the manufacturers’ instructions to use these
instructions.
2. A battery-operated AC milliampmeter. The Data Precision 245
digital multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by means of a VOM
or battery-operated AC voltmeter. The “limit” indication is 0.75 V,
so analog meters must have an accurate low voltage scale. The
Simpson’s 250 and Sanwa SH-63TRD are examples of passive
VOMs that are suitable. Nearly all battery-operated digital
multimeters that have a 2 VAC range are suitable (see Figure A).
How to Find a Good Earth Ground
A cold-water pipe is a guaranteed earth ground; the cover-plate
retaining screw on most AC outlet boxes is also at earth ground. If the
retaining screw is to be used as your earth ground, verify that it is at
ground by measuring the resistance between it and a cold-water pipe
with an ohmmeter. The reading should be zero ohms.
If a cold-water pipe is not accessible, connect a 60- to 100-watt trouble-
light (not a neon lamp) between the hot side of the receptacle and the
retaining screw. Try both slots, if necessary, to locate the hot side on
the line; the lamp should light at normal brilliance if the screw is at
ground potential (see Figure B).
To Exposed Metal
Parts on Set
0.15 µF
1.5 K Ω
AC
Voltmeter
(0.75 V)
Earth Ground
Trouble Light
AC Outlet Box
Ohmmeter
Cold-water Pipe
Figure A. Using an AC voltmeter to check AC leakage.
Figure B. Checking for earth ground.
