Sony KV-20M42, KV-20S42, KV-20S43, KV-21MB42, KV-21ME42 Service manual
...
SERVICE MANUAL
MODEL COMMANDER DEST CHASSIS NO.
KV-20M42 RM-Y156 US SCC-S27A-A
KV-20M42 RM-Y156 CND SCC-S28B-A
KV-20S42 RM-Y155 US SCC-S27B-A
KV-20S42 RM-Y155 CND SCC-S28C-A
KV-20S43 RM-Y156W US SCC-S27C-A
KV-20S43 RM-Y156W CND SCC-S28D-A
KV-21MB42C RM-Y156 E SCC-S25E-A
KV-21MB42M RM-Y156 MX SCC-S26A-A
KV-21MB42P RM-Y156 E SCC-S25A-A
KV-21ME42 RM-Y156 E SCC-S25B-A
KV-21ME42C RM-Y156 E SCC-S25F-A
KV-21SB42C RM-Y155 E SCC-S25G-A
BA-4D CHASSIS
KV-21SB42M RM-Y155 MX SCC-S26B-A
KV-21SE42 RM-Y155 E SCC-S25D-A
KV-21SE42C RM-Y155 E SCC-S25H-A
KV-21SE82 RM-Y165 E SCC-S25J-A
KV-21SE82C RM-Y165 E SCC-S25K-A
RM-Y155
MICROFILM
KV-21SE82
TRINITRON® COLOR TV
KV-20M42/20S42/20S43/21MB42C/21MB42M/21MB42P/21ME42/21ME42C/
21SB42C/21SB42M/21SE42/21SE42C/21SE82/21SE82C
SPECIFICA TIONS
KV-21MB42C,
KV-20M42
Power Requirements 120V 60Hz
Number of inputs/outputs
1)
Video
Audio Input
Audio Out
Speaker Output (W) 3W 3W 3Wx2 3W x 2 3Wx2 4Wx2 5Wx2
Power Consumption (W)
In Use (Max) 80W 80W 80W 90W 90W 90W 90W
In Standby 1W 1W 1W 1W 1W 1W 1W
Dimensions (W/H/D)
(mm)
(in)
Mass
2)
3)
2222222
2222222
------1
522 x 477 x 479 mm522 x 477 x 479 mm522 x 477 x 479 mm522 x 477 x 479 mm522 x 477 x 479 mm522 x 477 x 479 mm522 x 477 x 479
5
20
/8 x 1813/16 x
7
/8 in.
18
KV-21MB42M,
KV-21MB42P
AUTO VOLT
120-220V,
50/60 Hz
5
20
/8 x 1813/16 x
7
/8 in.
18
KV-21ME42,
KV-21ME42C
AUTO VOLT
120-220V,
50/60 Hz 120V 60 Hz
5
20
/8 x 1813/16 x
7
/8 in.
18
KV-20S42,
KV-20S43
5
20
/8 x 1813/16 x
7
/8 in.
18
KV-21SB42C,
KV-21SB42M
AUTO VOLT
120-220V,
50/60 Hz
5
20
/8 x 1813/16 x
7
/8 in.
18
KV-21SE42,
KV-21SE42C
AUTO VOLT
120-220V,
50/60 Hz
5
20
/8 x 1813/16 x
7
/8 in.
18
KV-21SE82,
KV-21SE82C
AUTO VOLT
120-220V,
50/60 Hz
mm
5
20
/8 x 1813/16 x
7
/8 in.
18
(kg) 21.6 kg 21.6 kg 21.6 kg 21.6 kg 21.6 kg 21.6 kg 21.6 kg
(lbs) 48 lbs. 48 lbs. 48 lbs. 48 lbs. 48 lbs. 48 lbs. 48 lbs.
Television system
American TV standard/NTSC
1)
1 Vp-p 75 ohms unbal anced, sync negativ e
2 )
500 mVrms (100% modulation), impedance: 47 kilohms
3)
More than 408 mVrms at the maximum volume setting (variable)
More than 408 mVrms (fix), Impedance: 5 kilohms
Picture tube
Trinitron® Tube
Channel coverage
VHF:2-13/UHF:14-69/CATV:1-125
Visible screen size
20" picture measured diagonally
Actual screen size
21" picture measured diagonally
Antenna
75 ohm external terminal for VHF/UHF
Supplied Accessories
Remote Commander (RM-Y155)
(KV-20S42/21SB42M/42C/21SE42/42C)
Remote Commander (RM-Y156)
(KV-20M42/21MB42C/42M/42P/21ME42/42C)
Remote Commander (RM-Y156W)
(KV-20S43)
Remote Commander (RM-Y165)
(•) SRS (SOUND RETRIEVAL SYSTEM)
(KV-21SE82/82C)
Size AA (R6) batteries (2)
Optional Accessories
Dipole antenna
Connecting cables VMC-810S/820S, VMC-720M,
YC-15V/30V, RK74A
U/V mixer EAC-66
Design and specifications are subject to change without notice.
The (•) SRS (SOUND RETRIEVAL SYSTEM) is
manufactured by Sony Corporation under license
from SRS Labs, Inc. It is covered by U.S. Patent No.
4,748,669. Other U.S. and foreign patents pending.
The word ‘SRS’ and the SRS symbol (•) are
registered trademarks of SRS Labs, Inc.
BBE and BBE symbol are trademarks of BBE
Sound, Inc. and are licensed by BBE Sound, Inc.
under U.S. Patent No. 4,638,258 and 4,482,866.
— 2 —
KV-20M42/20S42/20S43/21MB42C/21MB42M/21MB42P/21ME42/21ME42C/
21SB42C/21SB42M/21SE42/21SE42C/21SE82/21SE82C
TABLE OF CONTENTS
Section Title Page
Warnings and Cautions..................................................................................................................................................4
Self-Diagnostic Function.................................................................................................................................................4
Safety Check Out Instructions........................................................................................................................................7
1. GENERAL............................................................................................................................................................8
2. DISASSEMBLY
2-1. Rear Cover Removal....................................................................................................................................................12
2-2. A Board Removal..........................................................................................................................................................12
2-3. Service Position............................................................................................................................................................12
2-4. Picture Tube Removal..................................................................................................................................................13
3. SET-UP ADJUSTMENTS
3-1. Beam Landing...............................................................................................................................................................14
3-2. Convergence.................................................................................................................................................................15
3-3. Focus............................................................................................................................................................................16
3-4. Screen (G2)...................................................................................................................................................................16
3-5. Method of Setting the Service Adjustment Mode.........................................................................................................16
3-6. White Balance Adjustments..........................................................................................................................................16
4. SAFETY RELATED ADJUSTMENTS
4-1. R582 Confirmation Method (HV Hold-Down Confirmation and Readjustments)....................................................17
4-2. B+ Voltage Confirmation and Adjustment....................................................................................................................17
5. CIRCUIT ADJUSTMENTS
5-1. Setting the Service Adjustment Mode..........................................................................................................................19
5-2. Memory Write Confirmation Method.............................................................................................................................19
5-3. Adjust Buttons and Indicators.......................................................................................................................................19
5-4. A Board Adjustments....................................................................................................................................................22
6. DIAGRAMS
6-1. Block Diagram...............................................................................................................................................................27
6-2. Circuit Board Location..................................................................................................................................................30
6-3. Printed Wiring Boards and Schematic Diagrams.........................................................................................................33
• A Board.....................................................................................................................................................................33
• C Board....................................................................................................................................................................42
6-4. Semiconductors............................................................................................................................................................43
7. EXPLODED VIEWS
7-1. Chassis (KV-20S43/21SE42/42C/82/82C/ME42/42C).................................................................................................44
7-2. Chassis (KV-20M42/S42/21MB42C/42M/42P/SB42C/42M)........................................................................................45
8. ELECTRICAL PARTS LIST ...........................................................................................................................47
Table of Contents for Parts List ...........................................................................................................................................47
A Board Common Parts Listing............................................................................................................................................48
C Board Parts List................................................................................................................................................................56
A Board Variant Parts Lists...................................................................................................................................................57
Packaging List and Accessories....................................................................................................................................................65
— 3 —
KV-20M42/20S42/20S43/21MB42C/21MB42M/21MB42P/21ME42/21ME42C/
21SB42C/21SB42M/21SE42/21SE42C/21SE82/21SE82C
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.
SELF-DIAGNOSTIC FUNCTION
ATTENTION
APRES AVOIR DECONNECTE LE CAP DE L'ANODE, COURT-CIRCUITER L'ANODE
DU TUBE CATHODIQUE ET CELUI DE L'ANODE DU CAP AU CHASSIS
METALLIQUE DE L'APPAREIL, OU AU COUCHE DE CARBONE PEINTE SUR LE
TUBE CATHODIQUE OU AU BLINDAGE DU TUBE CATHODIQUE.
ATTENTION!!
AFIN D'EVITER TOUT RESQUE D'ELECTROCUTION PROVENANT D'UN CHÁSSIS
SOUS TENSION, UN TRANSFORMATEUR D'ISOLEMENT DOIT ETRE UTILISÉ
LORS DE TOUT DÉPANNAGE. LE CHÁSSIS DE CE RÉCEPTEUR EST
DIRECTEMENT RACCORDÉ À L'ALIMENTATION SECTEUR.
ATTENTION AUX COMPOSANTS RELATIFS A LA SECURITE!!
LES COMPOSANTS IDENTIFIES PAR UNE TRAME ET PAR UNE MARQUE SUR
LES SCHEMAS DE PRINCIPE, LES VUES EXPLOSEES ET LES LISTES DE
PIECES SONT D'UNEIMPORTANCE CRITIQUE POUR LA SECURITE DU
FONCTIONNEMENT. NE LES REMPLACER QUE PAR DES COMPOSANTS SONY
DONT LE NUMERO DE PIECE EST INDIQUE DANS LE PRESENT MANUEL OU
DANS DES SUPPLEMENTS PUBLIES PAR SONY. LES REGLAGES DE
CIRCUIT DONT L'IMPORTANCE EST CRITIQUE POUR LA SECURITE DU
FONCTIONNEMENT SONT IDENTIFIES DANS LE PRESENT MANUEL. SUIVRE CES
PROCEDURES LORS DE CHAQUE REMPLACEMENT DE COMPOSANTS
CRITIQUES, OU LORSQU'UN MAUVAIS FONTIONNEMENT SUSPECTE.
The units in this manual contain a self-diagnostic function. If an error occurs, the STANDBY/TIMER LED will automatically begin to
flash. The number of times the LED flashes translates to a probable source of the problem. A definition of the STANDBY/TIMER LED
flash indicators is listed in the instruction manual for the user’s knowledge and reference. If an error symptom cannot be reproduced, the
Remote Commander can be used to review the failure occurrence data stored in memory to reveal past problems and how often these
problems occur.
Diagnostic Test Indicators
When an error occurs, the STANDBY/TIMER LED will flash a set number of times to indicate the possible cause of the problem. If
there is more than one error, the LED will identify the first of the problem areas.
Results for all of the following diagnostic items are displayed on screen. No error has occurred if the screen displays a “0”.
Diagnostic Item
Description
Power does not turn on Does not light
+B overcurrent (OCP)* 2 times 2 :0 or 2: 1 • H.OUT (Q50 2) is sh orted (A Board)
Vertical deflection stopped* 4 times 4:0 or 4:1 • +13V is not supplied. (A Board)
White balance f ailure
(not balanced)
No. of Times
STANDBY/TIMER
LED Flashes
5 times 5:0 or 5:1 • Video OUT (Q394 t o 392) is faulty. (A Board)
Self-diagnostic Display/
Diagnostic Result
Probable Cause
Location
• Po w er c ord is not plugged in.
• Fuse is burned out (F601).
• IC701 and Q70 1 (C Board) are shorted.
• IC541 is faulty. (A Board)
• IC301 is faulty. (A Board)
• Screen (G2) is im properly adjusted.**
Detected Symptoms
• Power does not come on.
• No power is supplied to the TV.
• AC power supply is faulty.
• Power does not come on.
• Load on power line is shorted.
• Has entered standby state after horizontal raster.
• Vertical deflectio n puls e is s to pped.
• Power line is shorted or power supply is stoppe d.
• No raster is generated.
• CRT cathode current detect ion reference
pulse output is small.
* If a +B overcurrent is detected, stoppage of the vertical deflection is detected simultaneously.
The symptom that is diagnosed first by the microcontroller is displayed on the screen.
** Refer to Scr een (G2) Adjustments in Sections 3 and 4 of this manual.
— 4 —
KV-20M42/20S42/20S43/21MB42C/21MB42M/21MB42P/21ME42/21ME42C/
21SB42C/21SB42M/21SE42/21SE42C/21SE82/21SE82C
Display of Standby/Timer LED Flash Count
2 times
4 times
5 times
LED ON 0.3 sec.
LED OFF 0.3 sec.
Diagnostic Item Flash Count*
+B overcurrent 2 times
Vertical deflection stopped 4 times
White balance failure 5 times
*One flash count is not used for self-diagnostic.
LED OFF
3 sec.
STANDBY/TIMER LED
Stopping the Standby/Timer LED Flash
Turn off the power switch on the TV main unit or unplug the power cord from the outlet to stop the STANDBY/TIMER LED from
flashing.
Self-Diagnostic Screen Display
For errors with symptoms such as “power sometimes shuts off” or “screen sometimes goes out” that cannot be confirmed, it is
possible to bring up past occurrences of failure on the screen for confirmation.
To Bring Up Screen Test
In standby mode, press buttons on the Remote Commander sequentially, in rapid succession, as shown below:
Display Channel
Self Diagnostic Screen Display
SELF DIAGNOSTIC
2: 0
3: N/A 0
4: 0
5: 1
101: N/A 0
5
Sound volume
Numeral “0” means that no fault was detected.
Numeral “1” means a fault was detected one time only.
Power ON
Note that this differs from entering the service mode (sound volume
+
).
— 5 —
KV-20M42/20S42/20S43/21MB42C/21MB42M/21MB42P/21ME42/21ME42C/
21SB42C/21SB42M/21SE42/21SE42C/21SE82/21SE82C
Handling of Self-diagnostic Screen Display
Since the diagnostic results displayed on the screen are not automatically cleared, always check the self-diagnostic screen during
repairs. When you have completed the repairs, clear the result display to “0”.
Unless the result display is cleared to “0”, the self-diagnostic function will not be able to detect subsequent faults after completion
of the repairs.
Clearing the Result Display
To clear the result display to “0”, press buttons on the Remote Commander sequentially when the diagnostic screen is displayed,
as shown below:
8
ENTERChannel
Quitting the Self-Diagnostic Screen
To quit the entire self-diagnostic screen, turn off the power switch on the Remote Commander or the main unit.
Self-diagnostic Circuit
FROM
CRT
FROM
IC521
PIN 7
IC301
Y/CHROMA JUNGLE
IK IN
21
HP/PROTECT
18
SDA
35
IC541
V. OUT
REF
IC001
SYSTEM
IO-BDAT
O-LED
36
18
3
17
37
I-PROT
IO-SDAT
5
DISPLAY
IC003
MEMORY
B-DAT
+B overcurrent (OCP) Occurs when an overcurrent on the +B (115V) line is detected by pin 18 of IC301. If the voltage
of pin 18 of IC301 is less than 1V when V.SYNC is more than seven verticals in a period, the
unit will automatically turn off.
V ertical deflection stopped Occurs when an absence of the vertical deflection pulse is detected by pin 17 of IC001. Power
supply will shut down when waveform interval exceeds 2 seconds.
White balance failure If the RGB levels* do not balance within 2 seconds after the power is turned on, this error will be
detected by IC301. TV will stay on, but there will be no picture.
*(Refers to the RGB levels of the AKB detection Ref pulse that detects 1K.)
— 6 —
KV-20M42/20S42/20S43/21MB42C/21MB42M/21MB42P/21ME42/21ME42C/
Trouble Light
AC Outlet Box
Ohmmeter
Cold-water Pipe
SAFETY CHECK-OUT
21SB42C/21SB42M/21SE42/21SE42C/21SE82/21SE82C
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 microampere). 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 milliammeter. 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 guaranteed earth ground; the coverplate 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 coldwater 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
AC
Voltmeter
(0.75 V)
Earth Ground
Figure B. Checking for earth ground.Figure A. Using an AC voltmeter to check AC leakage.
— 7 —
SECTION 1 GENERAL
4
User Guide
Connecting Additional Equipment
TV and VCR
1
Connect the coaxial cable from your TV antenna or cable TV to the IN
jack on your VCR.
2
Connect a coaxial cable (not supplied) from the OUT jack on your
VCR to the VHF/UHF IN jack on the TV.
(Optional Connection)
3
If your VCR is equipped with video inputs, for best picture quality
you should connect A/V connectors to AUDIO/VIDEO OUT on
your VCR to AUDIO/VIDEO IN on your TV. You can use the
button to switch between the TV and VCR inputs.
✍
To watch video programs from your VCR, tune your TV to channel 3 or 4 (as
set on the rear of your VCR).
The instructions mentioned here are partial abstracts from the Operating Instruction
Manual. The page numbers shown reflect those of the Operating Instruction Manual.
Connecting Your TV
Connecting Your TV
KV-20M42/20S42/20S43/21MB42C/21MB42M/21MB42P/21ME42/21ME42C/
21SB42C/21SB42M/21SE42/21SE42C/21SE82/21SE82C
Read this chapter before setting up your TV for the first time. This section
covers basic connections in addition to any optional equipment you may
be connecting.
Basic Connections
TV with indoor or outdoor antenna, or CATV cable
Depending on the cable available in your home, choose one of the
connections below:
— 8 —
✍
If you are connecting to an indoor or outdoor antenna, it will be necessary to
adjust the orientation of the antenna for best reception.
3
Connecting Your TV
6
User Guide
TV, VCR, and Cable box
1
Connect the coaxial cable from the wall to the IN jack on your cable
box.
2
Connect a coaxial cable (not supplied) from the OUT jack on your
cable box to the IN jack on your VCR.
3
Connect a coaxial cable from OUT on your VCR to VHF/UHF IN on
your TV.
(Optional Connection)
4
If your VCR is equipped with video inputs, for best picture quality
you should connect A/V connectors to AUDIO/VIDEO OUT on
your VCR to AUDIO/VIDEO IN on your TV. You can use the
button to switch between the TV and VCR inputs.
✍
If you will be controlling all channel selection through your cable box, you
should consider using the CHANNEL FIX feature on page 17.
2
TV and Cable Box
— 9 —
1
Connect the coaxial cable from the wall to the IN jack on your cable
box.
2
Connect a coaxial cable (not supplied) from the OUT jack on your
cable box to the VHF/UHF IN jack on the TV.
✍
To view channels from your cable box, tune your TV to channel 3 or 4 (as set
on the rear panel of your cable box) and use the cable box’ s remote control to
change channels.
✍
If you will be controlling all channel selection through your cable box, you
should consider using the CHANNEL FIX feature on page 17.
KV-20M42/20S42/20S43/21MB42C/21MB42M/21MB42P/21ME42/21ME42C/
21SB42C/21SB42M/21SE42/21SE42C/21SE82/21SE82C
5
Connecting Your TV
Using the Remote Control and Basic Functions
9
Using the Remote Control and
Basic Functions
This section shows you how to use more advanced buttons on the remote
control and how to use the on-screen menus.
Turns the TV off automatically in approximately 30, 60 or 90
minutes. Cancel by pressing until SLEEP OFF appears.
Instantly turns off the sound. Press again or press to restore
sound.
Cycles through the available video inputs.
Press once to show current time, (if set) and channel number.
Press again to activate CAPTION VISION settings, if available. To
cancel, press again until DISPLAY OFF appears.
Cycles through the Multi-Channel TV Sound (MTS) options:
STEREO, SAP (Second Audio Programming) and MONO,
(KV-20S42, 20S43 only).
Press for channel selection, the channel will change after 2
seconds.
Press after selecting a channel using the - buttons to
immediately activate selection.
Alternates back and forth between the last two channels selected
with the - buttons.
Displays the on-screen menu. Press again to exit the menu at any
time.
Activates highlighted selections in the on-screen menu.
Moves the cursor in the on-screen menu.
Press to restore factory settings while in the on-screen menu.
✍
Buttons shown are for remote control RM-Y155, your remote control
may not look exactly like the one illustrated.
-
-
-
-
Connecting a Camcorder
Using A/V cables, connect AUDIO and VIDEO OUT on your camcorder
to AUDIO and VIDEO IN on your TV.
(Front A/V Panel)
A/V output
— 10 —
✍
For model KV-13M42, this connection can be made to the A/V input located
on the rear of the TV.
KV-20M42/20S42/20S43/21MB42C/21MB42M/21MB42P/21ME42/21ME42C/
21SB42C/21SB42M/21SE42/21SE42C/21SE82/21SE82C
7
Other Information
26
User Guide
If, after reading these operating instructions, you have additional questions related to the use of your
Sony television, please call our Direct Response Center at 1-800-222-SONY (7669) (U.S. customers
only) or (416) 499-SONY (7669) (Canadian customers only).
Cannot receive
higher number
channels (UHF)
when using an
antenna
❏ Make sure CABLE is set to OFF in the SET UP menu
(page 17).
❏ Use AUTO PROGRAM to add channels that are not
presently in the memory (page 17).
Cable stations
don’t seem to
work
❏ Make sure CABLE is set to ON in the SET UP menu
(page 16).
❏ Use AUTO PROGRAM to add channels that are not
presently in the memory (page 17).
Remote control
does not
operate
❏ Batteries could be weak. Replace them (page 2).
❏ Move the TV 3-4 feet away from fluorescent lights.
The TV needs
to be cleaned
❏ Clean the TV with a soft dry cloth. Never use strong
solvents such as thinner or benzine, which might
damage the finish of the cabinet.
Lost password
for PARENTAL
CONTROL
❏ In the password screen, enter the following master
password: 4357. After using the master password, you
must create a new password, it cannot be used to
unlock currently blocked programs.
Other Information
Troubleshooting
If you are having a problem with your TV, try the suggestions below. If
the problem persists, contact your nearest Sony dealer.
No picture, no
sound
— 11 —
Poor or no
picture, good
sound
Good picture,
no sound
No color ❏ Adjust COLOR in the VIDEO menu (page 13).
Only snow
appears on the
screen
Dotted lines or
stripes
Double images
or ghosts
❏ Make sure the power cord is plugged in.
❏ If a red light is flashing on the front of your TV for
more than a few minutes, call your local service center.
❏ Check the TV/VIDEO settings: when watching TV , set
to TV; when watching video equipment, set to VIDEO
(page 13).
❏ Check your PARENTAL CONTROL settings, (see
pages 22-23).
❏ Make sure the batteries have been inserted correctly
into the remote control.
❏ Try another channel, it could be station trouble.
❏ Adjust PICTURE in the VIDEO menu (page 13).
❏ Adjust BRIGHTNESS in the VIDEO menu (page 13).
❏ Check the antenna and/or cable connections (page 3).
❏ Press so that MUTING disappears from the
screen (page 9).
❏ Check your AUDIO settings. Your TV may be set to
SAP (page 14).
❏ Check the CABLE setting in the SET UP menu
(page 17).
❏ Check the antenna and/or cable connections (page 3).
❏ Make sure the channel selected is currently
broadcasting.
❏ Adjust the antenna.
❏ Move the TV away from other electronic equipment.
Some electronic equipment can create electrical noise,
which can interfere with TV reception.
❏ Check your outdoor antenna or call your cable service.
KV-20M42/20S42/20S43/21MB42C/21MB42M/21MB42P/21ME42/21ME42C/
21SB42C/21SB42M/21SE42/21SE42C/21SE82/21SE82C
25
KV-20M42/20S42/20S43/21MB42C/21MB42M/21MB42P/21ME42/21ME42C/
21SB42C/21SB42M/21SE42/21SE42C/21SE82/21SE82C
SECTION 2
DISASSEMBLY
2-1. REAR COVER REMOV AL
Rear Cover
Four Screws
(BVTP 4x16)
2-2. A BOARD REMOVAL 2-3. SERVICE POSITION
C Board
C Board
Claw
A Board
A Board
— 12 —
2-4. PICTURE TUBE REMOV AL
WARNING:
BEFORE REMOVING
THE ANODE CAP
High voltage remains in the CRT
even after the power is disconnected.
To avoid electric shock, discharge
CRT before attempting to remove the
anode cap. Short between anode and
CRT coated earth ground strap.
Degaussing Coil
Tension Spring (B)
C Board
KV-20M42/20S42/20S43/21MB42C/21MB42M/21MB42P/21ME42/21ME42C/
21SB42C/21SB42M/21SE42/21SE42C/21SE82/21SE82C
Two Screws
Two Speaker Boxes (KV-21SE82/82C ONLY)
A Board
Tuner
Coated
Deflection Yoke
Four Tapping Screws
Anode Cap
Two Screws
Earth
Ground
Strap
Picture Tube
Cushion
ANODE CAP REMOV AL
WARNING: High voltage remains in the CRT even after the power is disconnected. To avoid electrical shock, discharge the CRT before
NOTE: After removing the anode, short circuit the anode of the picture tube and the anode cap to either the metal chassis, CRT shield,
attempting to remove the anode cap. Short between anode and coated earth ground strap of CRT.
or carbon painted on the CRT.
REMOVAL PROCEDURES
c
b
a
1
Turn up one side of the rubber cap in
the direction indicated by arrow
a
.
2
Use your thumb to pull the rubber
cap firmly in the direction indicated
by arrow
HOW TO HANDLE AN ANODE CAP
1
Do not use sharp objects which may cause damage to the
surface of the anode cap.
2
To avoid damaging the anode cap, do not squeeze the rubber
covering too hard. A material fitting called a shatter-hook terminal
is built into the rubber.
3
Do not force turn the foot of the rubber cover. This may cause
the shatter-hook terminal to protrude and damage the rubber.
b
.
— 13 —
Anode Button
3
When one side of the rubber cap
separates from the anode button,
the anode cap can be removed by
turning the rubber cap and pulling
it in the direction of arrow
c
.
KV-20M42/20S42/20S43/21MB42C/21MB42M/21MB42P/21ME42/21ME42C/
21SB42C/21SB42M/21SE42/21SE42C/21SE82/21SE82C
SECTION 3
SET -UP ADJUSTMENTS
The following adjustments should be made when
a complete realignment is required or when a new
picture tube is installed.
These adjustments should be performed with rated
power supply voltage unless otherwise noted.
Set the controls and switch as follows unless
otherwise noted.
PICTURE control ................. Normal
BRIGHTNESS control......... Normal
3-1. BEAM LANDING
Before beginning adjustment procedure:
1. Degauss the entire screen.
2. Feed in the white pattern signal.
Adjustment Procedure
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 below.
Perform the adjustments in order as follows:
1. Beam Landing
2. Convergence
3. Focus
4. Screen (G2)
5. White Balance
Note: Test equipment required:
• Color bar pattern generator
• Degausser
• DC power supply
• Digital multimeter
5. Move the deflection yoke forward and adjust so that the
entire screen becomes green.
Purity Control
3. Turn the raster signal of the pattern generator to green.
4. Move the deflection yoke backward and adjust the purity
control so that green is in the center and red and blue are
at the sides evenly.
Blue Red
Green
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. If landing at the corner is not right, adjust by using the disk
magnets.
Purity control
corrects this area
ba
Disk magnets
or rotatable disk
cd
Deflection yoke positioning
corrects these areas
b
d
magnets correct
these areas (a-d)
a
c
— 14 —
KV-20M42/20S42/20S43/21MB42C/21MB42M/21MB42P/21ME42/21ME42C/
21SB42C/21SB42M/21SE42/21SE42C/21SE82/21SE82C
3-2. CONVERGENCE
Before starting convergence adjustments:
1. Perform FOCUS, V .LIN AND V.SIZE adjustments.
2. Set BRIGHTNESS control to minimum.
3. Feed in dot pattern.
Vertical Static Convergence
1. Adjust V.STAT magnet to converge red, green and blue
dots in the center of the screen (vertical movement).
Center dot
R G B
R
G
B
V.STAT magnet
If the blue dot does not converge with the red and green dots,
perform the following:
1. Move BMC magnet (a) to correct insufficient H. Static
convergence.
2. Rotate BMC magnet (b) to correct insufficient V. Static
convergence.
3. In either case, repeat Beam Landing Adjustment.
PURITY
V. STAT
BMC MAGNET
BMC magnet
a
2. Tilt the V.STAT magnet and adjust static convergence
to open or close the V.STAT magnet.
When the V.STAT magnet is moved in the direction of
arrows
and , red, green, and blue dots move as shown
below:
(1)
a
b
(2)
a
(3)
b
b
a
b
a
B
G
R
BGR
b
RGB
R
G
B
b
B
G
R
B
G
R
b
Dynamic Convergence Adjustment
Before performing this adjustment, perform Horizontal
and Vertical Static Convergence Adjustment.
1. Slightly loosen deflection yoke screw.
2. Remove deflection yoke spacers.
3. Move the deflection yoke for best convergence,
as shown below:
BGR
R
G
B
RGB
BGR
B
G
R
4. Tighten the deflection yoke screw.
5. Install the deflection yoke spacers.
RGB
RGB
G
B
B
G
R
BGR RGB
R
G
B
R
— 15 —
KV-20M42/20S42/20S43/21MB42C/21MB42M/21MB42P/21ME42/21ME42C/
(G2)
21SB42C/21SB42M/21SE42/21SE42C/21SE82/21SE82C
Screen-Corner Convergence
1. Affix a permalloy assembly corresponding to the
misconverged areas.
b
ba
a-d: screen-corner
misconvergence
cd
d
a
3-3. FOCUS
1. Adjust FOCUS control for best picture.
FOCUS
(FV)
SCREEN
3-5. METHOD OF SETTING THE SERVICE
ADJUSTMENT MODE
Service Mode Procedure
1. Standby mode (power off).
2.
Display Channel
c
on the Remote Commander (press each button within a
second).
5
Sound volume Power ON
+
Service Adjustment Mode In
1. The CRT displays the item being adjusted.
Disp.
Item
(Item)
Data
SERVICE HSIZ 0
2. Press or on the Remote Commander to select the
item.
3. Press
or on the Remote Commander to change the
data.
4. Press
then to save into the memory.
Service Adjustment Mode Memory
Turn set off then on to exit service adjustment mode.
3-4. SCREEN (G2)
1. Input a dots pattern.
2. Set the PICTURE and BRIGHTNESS controls at minimum
and COLOR control at normal.
3. Adjust SBRT, GCUT, BCUT in service mode with an
oscilloscope as shown below so that voltages on the red,
green, and blue cathodes are 170 VDC.
170 VDC
Ground
4. Observe the screen and adjust SCREEN (G2) VR to obtain
the faintly visible background of dot signal.
Pedestal
SERVICE WRITE
MUTING
ENTER
Green
Red
3-6. WHITE BALANCE ADJUSTMENTS
1. Input an entire white signal.
2. Set to Service Adjustment Mode.
3. Set DCOL to “0”.
4. Set the PICTURE and BRIGHTNESS to minimum.
5. Adjust with SBRT if necessary.
6. Select GCUT and BCUT with
7. Adjust with
and for the best white balance.
8. Set PICTURE and BRIGHTNESS to maximum.
9. Select GDRV and BDRV with
10.Adjust with
and for the best white balance.
11.Reset DCOL to “1”.
12. To write into memory, press
and .
and .
then .
— 16 —
KV-20M42/20S42/20S43/21MB42C/21MB42M/21MB42P/21ME42/21ME42C/
+
I ABL
ABL
T504
FBT
Range
-
Ammeter
3.0 mA DC
A
21SB42C/21SB42M/21SE42/21SE42C/21SE82/21SE82C
SECTION 4
SAFETY RELATED ADJUSTMENTS
4-1. R582 CONFIRMATION METHOD
(HV HOLD-DOWN CONFIRMATION)
AND READJUSTMENTS
The following adjustments should always be performed when
replacing the following components which are marked with
on the schematic diagram.
DY, C511, C574, C575, D572, D573, D574, R582,
R583, R584, R585, R586, R578, R625, R626, R634,
R635, T504, IC301, IC521, IC602
Preparation Before Confirmation
1. Turn the POWER switch ON. Input an entirely white
signal and set the PICTURE and BRIGHTNESS controls
to maximum.
2. Confirm that the voltage between C574 (+) and ground
is more than 99.8 VDC when the set is operating normally
with 120.0 ± 2.0 VAC (or 120-220±VAC for
KV-21MB42C/42M/42P/ME42/42C/SB42C/42M/
SE42/42C/82/82C).
Hold-down Operation Confirmation
1. Connect the current meter between Pin 11 of the FBT
(T504) and the PCB land where Pin 11 would normally
attach. (See Figure 1 on the following page.)
2. Input a dot signal and set PICTURE and BRIGHTNESS
to minimum: IABL = 95 + 100/-95mA.
3. Confirm the voltage of A Board TP-600 is
117.0 ± 0.3 VDC.
4. Connect the digital voltmeter and the DC power supply
via diode 1SS119 to C574 (+) and ground
(See Figure 1 on the following page).
5. Increase the DC power voltage gradually until the picture
blanks out.
6. Read the digital voltmeter indication.
7. Turn DC power source off immediately:
(standard: less than or equal to 127.3 VDC).
8. Input a white signal and set PICTURE and BRIGHTNESS
to maximum: (standard: less than or equal to 127.3 VDC).
9. Repeat steps 4 to 7.
Hold-down Readjustment
If the setting indicated in step 2 of Hold-down Operation
Confirmation cannot be met, readjustment should be performed
by altering the resistance value of R582, a component marked
with
.
4-2. B+ VOL TAGE CONFIRMATION AND
ADJUSTMENT
Note: The following adjustments should always be performed
when replacing the following components, which are marked
with
on the schematic diagram.
IC001, IC602, R030, R626, R632, R633, R635, R636,
R637, R638, R639
1. Supply 120.0 ± 2.0 VAC (or 120-220±VAC for
KV-21MB42C/42M/42P/ME42/42C/SB42C/42M/SE42/
42C/82/82C) to the set with a variable auto transformer.
2. Input a dot signal.
3. Set the PICTURE and BRIGHTNESS controls to minimum.
4. Set to Service Adjustment Mode.
5. Select PADJ with
6. Adjust with
7. Confirm the voltage of A board TP-600 is less than
125 VDC.
8. If step 7 is not satisifed, replace the components and repeat
the above steps.
9. Supply 120.0 ± 2.0 VAC (or 120-220±VAC for
KV-21MB42C/42M/42P/ME42/42C/SB42C/42M/SE42/
42C/82/82C) to the set with a variable auto transformer.
10.Adjust with
11.Press
and .
to the 0 level.
and for 117.0 ± .3 VDC.
then to save into the memory.
— 17 —
KV-20M42/20S42/20S43/21MB42C/21MB42M/21MB42P/21ME42/21ME42C/
21SB42C/21SB42M/21SE42/21SE42C/21SE82/21SE82C
Digital
Multimeter
+
–
TP600
C574
R582
ABL11
Ammeter
3mA DC Range
A
+
–
T504
FBT
Power
Supply
+
–
Digital
Multimeter
1SS119
+
–
Figure 1
— 18 —
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