Sony Trinitron KV-20S90 User manual

TRINITRON®COLOR TELEVISION
BA-4D CHASSIS
MODEL NAME REMOTE COMMANDER DESTINATION CHASSIS NO.
HISTORY INFORMATION FOR THE FOLLOWING MANUAL:
9-965-905-01
ORIGINAL MANUAL ISSUE DATE: 4/2001
ANY REVISIONS AND UPDATES TO THE ORIGINAL MANUAL ARE APPENDED TO THE END OF THE PDF FILE.
REVISION DATE REVISION TYPE SUBJECT
4/2001 No revisions or updates applicable at this time
KV-20S90 RM-Y155 US SCC-S27NA
KV-21SE43C RM-Y155 E SCC-S55BA

TRINITRON® COLOR TELEVISION
SERVICE MANUAL BA-4D CHASSIS
MODEL NAME REMOTE COMMANDER DESTINATION CHASSIS NO.
Self Diagnosis
Supported model
KV-20S90
9-965-905-01
KV-20S90 RM-Y155 US SCC-S27NA
KV-21SE43C RM-Y155 E SCC-S55BA
RM-Y155
Trinitron

— 2 —
KV-20S90 / 21SE43C
TABLE O CONTENTS
Specifi cations.......................................................................................................................................3
Warnings and Cautions........................................................................................................................4
Safety Check-out .................................................................................................................................5
Self-Diagnostic Function......................................................................................................................
1. Disassembly
1-1. Rear Cover Removal.....................................................................................................................8
1-2. Chassis Assembly Removal..........................................................................................................8
1-3. Service Position ............................................................................................................................8
1-4. Picture Tube Removal ...................................................................................................................9
Anode Cap Removal Procedure...................................................................................................9
2. Set-up Adjustments
2-1. Beam Landing...............................................................................................................................10
2-2. Convergence.................................................................................................................................11
2-3. Focus ............................................................................................................................................12
2-4. Screen (G2) ..................................................................................................................................12
2-5. Method of Setting the Service Adjustment Mode..........................................................................13
2- . White Balance Adjustments ..........................................................................................................13
3. Safety Related Adjustments
3-1.
X R582 Confi rmation Method (Hold Down Confi rmation) and Readjustments...........................14
3-2. B+ Voltage Confi rmation and Adjustment .....................................................................................14
4. Circuit Adjustments
4-1. Setting the Service Adjustment Mode...........................................................................................1
4-2. Memory Write Confi rmation Method .............................................................................................1
4-3. Remote Adjustment Buttons and Indicators .................................................................................1
Adjustment Items..........................................................................................................................17
4-4. A Board Adjustments ....................................................................................................................18
5. Diagrams
5-1. Circuit Boards Location.................................................................................................................21
5-2. Printed Wiring Board and Schematic Diagram Information ..........................................................21
5-3. Block Diagram and Schematics ....................................................................................................22
Block Diagram ..............................................................................................................................22
A Board Schematic Diagram ........................................................................................................23
C Board Schematic Diagram........................................................................................................28
5-4. Semiconductors ............................................................................................................................30
6. Exploded Views
-1. Chassis .........................................................................................................................................31
7. Electrical Parts List ......................................................................................................................................32
SECTION TITLE PAGE

— 3 —
KV-20S90 / 21SE43C
Television system
American TV Standard/NTSC
Channel coverage
VHF: 2-13/ UHF: 14- 9/ CATV: 1-125
Picture tube
Flat Trinitron
®
tube
Visible screen size
20-inch picture measured diagonally
Actual screen size
21-inch measured diagonally
Antenna
75 ohm external terminal for VHF/UHF
Supplied Accessories
Remote Commander RM-Y155
Size AA (R ) batteries (2)
Telescopic Antenna (KV-21SE43C ONLY)
Optional Accessories
None
SPECI ICATIONS
Design and specifi cations are su ject to change without notice.
1) 1 Vp-p 75 ohms unbalanced, sync negative
2) 500 m Vrms (100% modulation), Impedance: 47 kilohms
KV-21SE43C KV-20S90
Power requirements 220V 50Hz 120V 60Hz
Number of Inputs/ utputs
Video 1) 22
Audio Input 2) 22
Speaker output (W) 4W x 2 3W x 2
Power Consumption (W)
In use (Max) 95W 90W
In Standby 1W 1W
Dimensions(W/H/D)
mm 522 x 477 x 479 mm 522 x 477 x 479 mm
in 20 5/8 x 18 13/16 x 18 7/8 in. 20 5/8 x 18 13/16 x 18 7/8 in.
Mass
kg 21.6 kg 21.6 kg
lbs 48 lbs 48 lbs

— 4 —
KV-20S90 / 21SE43C
WARNINGS AND CAUTI NS
CAUTI N
Short ir uit the anode of the pi ture tube and the anode ap to the metal hassis, CRT shield, or arbon painted on the CRT,
after removing the anode.
WARNING!!
An isolation transformer should be used during any servi e to avoid possible sho k hazard, be ause of live hassis. The hassis of
this re eiver is dire tly onne ted to the AC power line.
! SAFETY-RELATED C MP NENT WARNING!!
Components identifi ed by shading and ! mark on the s hemati diagrams, exploded views, and in the parts list are riti al for
safe operation. Repla e these omponents with Sony parts whose part numbers appear as shown in this manual or in supplements
published by Sony. Cir uit adjustments that are riti al for safe operation are identifi ed in this manual. Follow these pro edures
whenever riti al omponents are repla ed or improper operation is suspe ted.
ATTENTI N!!
Apres avoir de onne te le ap de l’anode, ourt- ir uiter l’anode du tube athodique et elui de l’anode du ap au hassis metallique
de l’appareil, ou la ou he de arbone peinte sur le tube athodique ou au blindage du tube athodique.
Afi n d’eviter tout risque d’ele tro ution provenant d’un hássis sous tension, un transformateur d’isolement doit etre utilisé lors de tout
dépannage. Le hássis de e ré epteur est dire tement ra ordé à l’alimentation du se teur.
! ATTENTI N AUX C MP SANTS RELATIFS A LA SECURITE!!
Les omposants identifi es par une trame et par une marque ! sur les s hemas de prin ipe, les vues explosees et les listes de
pie es sont d’une importan e ritique pour la se urite du fon tionnement. Ne les rempla er que par des omposants Sony dont
le numero de pie e est indique dans le present manuel ou dans des supplements publies par Sony. Les reglages de ir uit dont
l’importan e est ritique pour la se urite du fon tionnement sont identifi es dans le present manuel. Suivre es pro edures lors de
haque rempla ement de omposants ritiques, ou lorsqu’un mauvais fon tionnement suspe te.

— 5 —
KV-20S90 / 21SE43C
SAFETY CHECK- UT
After orre ting the original servi e problem, perform the following
safety he ks before releasing the set to the ustomer:
1. Che k the area of your repair for unsoldered or poorly soldered
onne tions. Che k the entire board surfa e for solder splashes and
bridges.
2. Che k the interboard wiring to ensure that no wires are “pin hed” or
tou hing high-wattage resistors.
3. Che k that all ontrol knobs, shields, overs, ground straps, and
mounting hardware have been repla ed. Be absolutely ertain that
you have repla ed all the insulators.
4. Look for unauthorized repla ement parts, parti ularly transistors,
that were installed during a previous repair. Point them out to the
ustomer and re ommend their repla ement.
5. Look for parts whi h, though fun tioning, show obvious signs of
deterioration. Point them out to the ustomer and re ommend their
repla ement.
6. Che k the line ords for ra ks and abrasion. Re ommend the
repla ement of any su h line ord to the ustomer.
7. Che k the B+ and HV to see if they are spe ifi ed values. Make sure
your instruments are a urate; be suspi ious of your HV meter if sets
always have low HV.
8. Che k the antenna terminals, metal trim, “metallized” knobs, s rews,
and all other exposed metal parts for AC leakage. Che k leakage
as des ribed 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
hassis, must not ex eed 0.5 mA (500 mi roamperes). Leakage urrent
an be measured by any one of three methods.
1. A ommer ial leakage tester, su h as the Simpson 229 or
RCA WT-540A. Follow the manufa turers’ instru tions to use these
instru tions.
2. A battery-operated AC milliampmeter. The Data Pre ision 245 digital
multimeter is suitable for this job.
3. Measuring the voltage drop a ross a resistor by means of a VOM
or battery-operated AC voltmeter. The “limit” indi ation is 0.75 V,
so analog meters must have an a urate low voltage s ale. 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 old-water pipe is a guaranteed earth ground; the over-plate retaining
s rew on most AC outlet boxes is also at earth ground. If the retaining
s rew is to be used as your earth ground, verify that it is at ground
by measuring the resistan e between it and a old-water pipe with an
ohmmeter. The reading should be zero ohms.
If a old-water pipe is not a essible, onne t a 60- to 100-watt trouble-
light (not a neon lamp) between the hot side of the re epta le and the
retaining s rew. Try both slots, if ne essary, to lo ate the hot side on the
line; the lamp should light at normal brillian e if the s rew is at ground
potential (see Figure B).
To Exposed Metal
Parts on Set
0.15 F 1.5 K ΩAC
Voltmeter
(0.75 V)
Earth Ground
Trouble Light
AC Outlet Box Ohmmeter
Cold-water Pipe
Figure A. Using an AC voltmeter to he k AC leakage. Figure B. Che king for earth ground.

— 6 —
KV-20S90 / 21SE43C
Detected Symptoms
SELF-DIAGN STIC FUNCTI N
*If a +B over urrent is dete ted, stoppage of the verti al defl e tion is dete ted simultaneously. The symptom that is diagnosed fi rst by the
mir ro ontroller is displayed on the s reen.
**Refer to S reen (G2) Adjustments in Se tion 2-4. of this manual.
Display of Standby/Timer LED Flash Count
2 times
4 times
5 times
LED N 0.3 sec.
LED FF 0.3 sec. LED FF
3 sec.
Diagnostic Item Flash Count*
+B Over urrent 2 times
Verti al Defl e tion Stopped 4 times
White Balan e Failure 5 times
*One fl ash ount is not used for self-diagnosti .
Stopping the Standby/Timer LED Flash
Turn off the power swit h on the TV main unit or unplug the power ord from the outlet to stop the STANDBY/TIMER LAMP from fl ashing.
Self Diagnosis
Supported model
Standby/Timer LED
The units in this manual ontain a self-diagnosti fun tion. If an error o urs, the STANDBY/TIMER LED will automati ally begin to fl ash. The number
of times the LED fl ashes translates to a probable sour e of the problem. A defi nition of the STANDBY/TIMER LED fl ash indi ators is listed in the
instru tion manual for the user’s knowledge and referen e. If an error symptom annot be reprodu ed, the Remote Commander an be used to review
the failure o urren e data stored in memory to reveal past problems and how often these problems o ur.
Diagnostic Test Indicators
When an error o urs, the STANDBY/TIMER LED will fl ash a set number of times to indi ate the possible ause of the problem. If there is more than
one error, the LED will identify the fi rst of the problem areas.
Results for all of the following diagnosti items are displayed on s reen. No error has o urred if the s reen displays a “0”.
Power does not turn on
+B over urrent (OCP)*
Verti al Defl e tion
Stopped
White Balan e failure
(not balan ed)
Does not light
2 times
4 times
5 times
2:0 or 2:1
4:0 or 4:1
5:0 or 5:1
• Power ord is not plugged in.
• Fuse is burned out (F601). (A Board)
• H.OUT (Q502) is shorted.(A Board)
• IC1751 (C Board) is shorted.
• +13V is not supplied. (A Board)
• IC541 is faulty. (A Board)
• Video OUT (Q392 to Q394) is faulty.
(A Board)
• IC301 is faulty. (A Board)
• S reen (G2) is improperly
No. of times
STANDBY/ TIMER
lamp fl ashes
Diagnostic Item
Description
Self-Diagnositc
Display/
Diagnostic Result
Probable Cause Location
• Power does not ome on.
• No power is supplied to the TV.
• AC Power supply is faulty.
• Power does not ome on.
• Load on power line is shorted.
• Has entered standby state after horizontal raster.
• Verti al defl e tion pulse is stopped.
• Power line is shorted or power supply is stopped.
• No raster is generated.
• CRT Cathode urrent dete tion referen e pulse
output is small.

— 7 —
KV-20S90 / 21SE43C
Self-Diagnostic Screen Display
For errors with symptoms su h as “power sometimes shuts off” or “s reen sometimes goes out” that annot be onfi rmed, it is possible to bring up
past o urren es of failure on the s reen for onfi rmation.
To Bring Up Screen Test
In standby mode, press buttons on the Remote Commander sequentially, in rapid su ession, as shown below:
Display Channel 5
Sound Volume - Power ON
Self-Diagnostic Screen Display
Numeral “0” means that no fault was dete ted.
Numeral “1” means a fault was dete ted one time only.
SELF DIAGN STIC
2: 000
3: N/A
4: 000
5: 001
101: N/A
Handling of Self-Diagnostic Screen Display
Sin e the diagnosti results displayed on the s reen are not automati ally leared, always he k the self-diagnosti s reen during repairs. When you
have ompleted the repairs, lear the result display to “0”.
Unless the result display is leared to “0”, the self-diagnosti fun tion will not be able to dete t subsequent faults after ompletion of the repairs.
Clearing the Result Display
To lear the result display to “0”, press buttons on the Remote Commander sequentially when the diagnosti s reen is displayed, as shown below:
Channel 8 ENTER
Quitting the Self-Diagnostic Screen
To quit the entire self-diagnosti s reen, turn off the power swit h on the Remote Commander or the main unit.
Self-Diagnostic Circuit
+B overcurrent ( CP)
O urs when an over urrent on the +B (115V) line is dete ted by pin 18 of IC301. If the voltage of pin 18 of IC301 is less than 1V when V.SYNC is more
than seven verti als in a period, the unit will automati ally turn off.
Vertical Defl ection Stopped
O urs when an absen e of the verti al defl e tion pulse is dete ted by pin 17 of IC001. Power supply will shut down when waveform interval
ex eeds 2 se onds.
White Balance Failure
If the RGB levels* do not balan e within 2 se onds after the power is turned on, this error will be dete ted by IC301. TV will stay on, but there
will be no pi ture.
*(Refers to the RGB levels of the AKB dete tion Ref pulse that dete ts 1K).
Note that this differs from entering the Servi e Mode (Sound Volume + ).
IC301
Y/CHROMA JUNGLE IC541
V. OUT
IC001
SYSTEM
IC003
MEMORY
IK IN
FROM
CRT
HP/PROTECT
SDA
FROM
IC521
PIN 7
18
IO-SDAT
O-LED
REF I-PROT
IO-BDAT BDA
DISPLAY
21
35
317
37 18
36 5

— 8 —
KV-20S90 / 21SE43C
1-1. REAR C VER REM VAL
1-2. CHASSIS ASSEMBLY REM VAL 1-3. SERVICE P SITI N
SECTI N 1: DISASSEMBLY
S rew +BVTP 4x16
Chassis Assembly
C Board
A Board
S rew +BVTP 4x16
2 S rews +BVTP 4x16
Claw
Rear Cover

— 9 —
KV-20S90 / 21SE43C
1. Dis harge the anode of the CRT and remove the anode ap.
2. Unplug all inter onne ting leads from the defl e tion yoke, ne k
assembly, degaussing oils and CRT grounding strap.
3. Remove the C Board from the CRT.
4. Remove the hassis assembly.
5. Loosen the ne k assembly fi xing s rew and remove.
6. Loosen the defl e tion yoke fi xing s rew and remove.
7. Pla e the set with the CRT fa e down on a ushion and remove
the degaussing oil holders.
8. Remove the degaussing oils.
9. Remove the CRT grounding strap and spring tension devi es.
10. Uns rew the four CRT fi xing s rews [lo ated on ea h CRT
orner] and remove the CRT [Take are not to handle the CRT
by the ne k].
1-4. PICTURE TUBE REM VAL
WARNING: BEF RE REM VING THE AN DE 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.
Coated
Earth
Ground
Strap
AN DE CAP REM VAL PR CEDURE
WARNING: High voltage remains in the CRT even after the power is dis onne ted. To avoid ele tri sho k, dis harge CRT before attempting to
remove the anode ap. Short between anode and oated earth ground strap of CRT.
NOTE: After removing the anode ap, short ir uit the anode of the pi ture tube and the anode ap to either the metal hassis, CRT shield, or
arbon painted on the CRT.
H W T HANDLE AN AN DE CAP
1. Do not use sharp obje ts whi h may ause damage to the surfa e of the anode
ap.
2. To avoid damaging the anode ap, do not squeeze the rubber overing too hard.
A material fi tting alled a shatter-hook terminal is built into the rubber.
3. Do not for e turn the foot of the rubber over. This may ause the shatter-hook
terminal to protrude and damage the rubber.
10
1
9
87
6
5
4
3
2
a
b
Anode Button
c
Turn up one side of the rubber ap in
the dire tion indi ated by arrow a .
1Use your thumb to pull the rubber
ap fi rmly in the dire tion indi ated
by arrow b .
2When one side of the rubber ap separates from
the anode button, the anode ap an be removed
by turning the rubber ap and pulling it in the
dire tion of arrow .
3

— 10 —
KV-20S90 / 21SE43C
The following adjustments should be made when a omplete
realignment is required or a new pi ture tube is installed.
These adjustments should be performed with rated power supply
voltage unless otherwise noted.
Set the ontrols as follows unless otherwise noted:
VIDEO MODE: Standard
PICTURE CONTROL: Normal
BRIGHTNESS CONTROL: Normal
SECTI N 2: SET-UP ADJUSTMENTS
Perform the adjustments in order as follows:
1. Beam Landing
2. Convergen e
3. Fo us
4. S reen (G2)
5. White Balan e
Note Test Equipment Required:
1. Color Bar Pattern Generator
2. Degausser
3. DC Power Supply
4. Digital Multimeter
2-1. BEAM LANDING
Before beginning adjustment pro edure:
1. Degauss the entire s reen.
2. Feed in the white pattern signal.
ADJUSTMENT PR CEDURE
1. Input a raster signal with the pattern generator.
2. Loosen the defl e tion yoke mounting s rew, and set the purity ontrol
to the enter as shown below:
Purity Control
3. Turn the raster signal of the pattern generator to green.
4. Move the defl e tion yoke ba kward, and adjust with the purity ontrol
so that green is in the enter and red and blue are even on both
sides.
Blue Red
Green
5. Move the defl e tion yoke forward, and adjust so that the entire s reen
be omes green.
6. Swit h over the raster signal to red and blue and onfi rm the
ondition.
7. When the position of the defl e tion yoke is determined, tighten it with
the defl e tion yoke mounting s rew.
8. If landing at the orner is not right, adjust by using the disk magnets.
a
c
b
d
ba
cd
Purity control
corrects this area
Disk magnets
or rotatable disk
magnets correct
these areas (a-d)
Deflection yoke positioning
corrects these areas

— 11 —
KV-20S90 / 21SE43C
2-2. C NVERGENGE
Before starting onvergen e adjustments:
1 Perform FOCUS, VLIN and VSIZE adjustments.
2. Set BRIGHTNESS ontrol to minimum.
3. Feed in dot pattern.
VERTICAL STATIC C NVERGENCE
1. Adjust V. STAT magnet to onverge red, green and blue dots in the
enter of the s reen (Verti al movement adjust V.STAT RV701 to
onverge).
B
G
R
Center dot
R G B
V.STAT magnet
2. Tilt the V. STAT magnet and adjust stati onvergen e to open or lose
the V. STAT magnet.
When the V. STAT magnet is moved in the dire tion of arrow a and b,
red, green, and blue dots move as shown below:
B
R
G
B
R
G
RGB
BGR
1
2
b
bb
b
b
b
b
aab
a
a
aa
3
R
G
B
B
G
R
If the blue dot does not onverge with the red and green dots, peform
the following:
1. Move BMC magnet (a) to orre t insuffi ient H.Stati onvergen e.
2. Rotate BMC magnet (b) to orre t insuffi ient V.Stati onvergen e.
3. In either ase, repeat Beam Landing Adjustment.
BMC MAGNET
PURITY
V.S TAT
b
BMC magnet
a

— 12 —
KV-20S90 / 21SE43C
DYNAMIC C NVERGENCE ADJUSTMENT
Before performing this adjustment, perform Horizontal and Verti al Stati
Convergen e Adjustment.
1. Slightly loosen defl e tion yoke s rew.
2. Remove defl e tion yoke spa ers.
3. Move the defl e tion yoke for best onvergen e as
shown below:
RGB BGR
RGB
R
R
R
G
B
G
B
G
B
RGB
BGR
R
G
BR
G
B
BGR RGB
4. Tighten the defl e tion yoke s rew.
5. Install the defl e tion yoke spa ers.
SCREEN-C RNER C NVERGENCE
1. Affi x a permalloy assembly orresponding to the mis onverged areas:
ba
cd
a
b
a-d: screen-corner
misconvergence
c
d
2-3. F CUS
1. Adjust FOCUS ontrol for best pi tures.
2-4. SCREEN (G2)
1. Input a dot pattern.
2. Set the PICTURE and BRIGHTNESS ontrols at minimum and
COLOR ontrol at normal.
3. Adjust SBRT, GCUT, BCUT in servi e mode with an os illos ope as
shown below so that voltages on the red, green, and blue athodes
are 170 ± 2 VDC.
pedestal
GND
170 ± 2 VDC
4. Observe the s reen and adjust SCREEN (G2) VR to obtain the faintly
visible ba kground of dot signal.
Fo us (FV)
S reen (G2)

— 13 —
KV-20S90 / 21SE43C
2-5. METH D F SETTING THE SERVICE
ADJUSTMENT M DE
SERVICE M DE PR CEDURE
1. Standby mode (power off).
2. Press Display Channel 5 Sound Volume + Power
on the Remote Commander (press ea h button within a se ond).
SERVICE ADJUSTMENT M DE IN
1. The CRT displays the time being adjusted.
Mode Display
Item
Item
Data
SERVICE HSIZ 0
2. Press 1 or 4 on the Remote Commander to sele t the time.
3. Press 3 or 6 on the Remote Commander to hange the data.
4. Press MUTING then ENTER to save into the memory.
SERVICE ADJUSTMENT M DE MEM RY
Turn the set off then on to exit Servi e Adjustment Mode.
Mode
WRITE
ENTER
Green
Red
MUTING
SERVICE
2-6. WHITE BALANCE ADJUSTMENTS
1. Input an entire white signal.
2. Set to Servi e Adjustment Mode.
3. Set DCOL to “0”.
4. Set the PICTURE and BRIGHTNESS to minimum.
5. Adjust with SBRT if ne essary.
6. Sele t GCUT and BCUT with 1 and 4 .
7. Adjust with 3 and 6 for the best white balan e.
8. Set the PICTURE and BRIGHTNESS to maximum.
9. Sele t GDRV and BDRV with 1 and 4.
10. Adjust with 3 and 6 for the best white balan e.
11. Reset DCOL to “1”.
12. To write into memory, press MUTING then ENTER .

— 14 —
KV-20S90 / 21SE43C
H LD-D WN READJUSTMENT
If the setting indi ated in Step 2 of Hold-Down Operation Confi rmation
annot be met, readjustment should be performed by altering the
resistan e value of R582 omponent marked with
X .
+
IABL
ABL
T504
FBT
range
-
ampmeter
3.0 mA DC
A
3-2. B+ V LTAGE C NFIRMATI N AND
ADJUSTMENT
Note: The following adjustments should always be performed when
repla ing the following omponents, whi h are marked with
Y on the
s hemati diagram on the A Board:
A B ARD: IC001,IC602, R030, R625, R626,
R632, R633, R635, R636, R637, R638, R639
1. Supply 130 +2.0 / -0.0V to the set with a variable auto transformer.
2. Input a dot signal.
3. Set the PICTURE and the BRIGHTNESS ontrols to minimum.
4. Set to Servi e Adjustment Mode.
5. Sele t PADJ with 1 and 4 .
6. Adjust with 6 to the 0 level.
7. Confi rm the voltage of A Board TP-600 is <125 VDC.
8. If step 7 is not satisfi ed, repla e the omponents listed above, then
repeat the above steps.
9. Supply 130 +2.0 / -0.0V to the set with a variable auto transformer.
10. Adjust with 3 and 6 for 117.0 ± 0.3 VDC.
11. Press MUTING then ENTER to save into the memory.
SECTI N 3: SAFETY RELATED ADJUSTMENTS
3-1. X R582 C NFIRMATI N METH D
(H LD-D WN C NFIRMATI N) AND
READJUSTMENTS
The following adjustments should always be performed when repla ing
the following omponents whi h are marked with
Y on the s hemati
diagram:
Part Repla ed ( ) Adjustment ( )
DY, C511, C574, C575, D572,
D573, D574, R582, R583, R584,
R585, R586, R578, R625, R626,
R640, R635,T504, IC301, IC521,
IC602.............................A Board
HV HOLD-DOWN
R582
PREPARATI N BEF RE C NFIRMATI N
1. Turn the POWER swit h ON. Input a white signal and set the
PICTURE and BRIGHTNESS ontrols to maximum.
2. Confi rm that the voltage between C574 (+) and ground is more than
99.8 VDC when set is operating normally with 120 +/- 2 VAC.
H LD-D WN PERATI N C NFIRMATI N
1. Conne t the urrent meter between Pin 11 of the FBT (T504) and
the PWB land where Pin 11 would normally atta h (See Figure 1 on
the next page).
2. Input a dot signal and set PICTURE and BRIGHTNESS to minimum:
IABL = 95 + 100/-95µA.
3. Confi rm the voltage of A Board TP-600 is 117 ± 0.3 VDC.
4. Conne t the digital voltmeter and the DC power supply via Diode
1SS119 to C574 (+) and ground (See Figure 1 on next page).
5. In rease the DC power voltage gradually until the pi ture blanks out.
6. Turn DC power sour e off immediately.
7. Read the digital voltmeter indi ation (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.

— 15 —
KV-20S90 / 21SE43C
CN501
C
57
3
IC521
J200
J203
D5
0
2
R3
11
D
54
1
D5
7
2
R5
45
R5
43
R5
5
2
C
56
2
C
5
64
R
50
4
IC541
R
54
2
T504
CN502
R5
4
9
D
3
00
R5
76
D
58
1
R
5
53
D
5
20
C5
74
D
20
6
C3
2
5
C
5
42
D
5
74
L503
R5
7
8
R
54
4
C5
11
R5
33
R5
34
R
5
32
R
53
5
R283
R280
R216
R585
R583
L
50
4
D
5
51
R
5
51
L
59
1
R
57
1
C
59
1
R5
0
5
T5
C
5
04
C5
0
8
R5
91
C5
7
1R
5
72
R
57
4
Q5
7
1
Q
5
01
C580
CN5
C
52
0
H DY +
H DY +
H DY -
H DY -
V DY -
V DY +
1
2
3
4
5
6
7
8
9
10
11
1
26
7
B
C
16
TP508
V OUT
TP507
V MID
BL
+13V
HETER
-13V200V
TP600
B+
TP505
900V
TP504
180V
TP506
H OUT
TP502
+13V
TP501
-13V
TP403
L OUT
R OUT
TP404
3
4
B
E
E
Figure 1
+
-
AMMETER
3mA dc range
A
TP600
X R582
C574
T504 FBT
Pin 11
+
-
P WER
SUPPLY
1SS119
+
-
DIGITAL
MULTIMETER
+
-
DIGITAL
MULTIMETER

— 16 —
KV-20S90 / 21SE43C
4-1. SETTING THE SERVICE ADJUSTMENT
M DE
1. Standby mode (Power off).
2. Press the following buttons on the remote ommander within a
se ond of ea h other:
Display Channel 5 Sound Volumne + Power
SERVICE ADJUSTMENT M DE N
1. The CRT displays the item being adjusted.
Mode Display
Item
Item
Data
SERVICE HSIZ 0
2. Press 1 or 4 on the Remote Commander to sele t the item.
3. Press 3 or 6 on the Remote Commander to hange the data.
4. Press MUTING then ENTER to write into memory.
SERVICE ADJUSTMENT M DE MEM RY
Mode
WRITE
ENTER
Green
Red
MUTING
SERVICE
1. Press 8 then ENTER on the Remote Commander to initialize.
Mode
Carry out Step 1 when adjusting
IDs 0-7 and when repla ing and
adjusting IC003
SERVICE RESET
2. Turn set off then on to exit servi e adjustment mode.
4-2. MEM RY WRITE C NFIRMATI N
METH D
1. After adjustment, pull out the plug from the AC outlet, then repla e
the plug in the AC outlet again.
2. Turn the power swit h ON and set to Servi e Mode.
3. Call the adjusted items again to onfi rm they were adjusted.
4-3. REM TE ADJUSTMENT BUTT NS AND
INDICAT RS
SECTI N 4: CIRCUIT ADJUSTMENTS
ELECTRICAL ADJUSTMENTS BY REM TE C MMANDER
Use the Remote Commander (RM-Y155) to perform the ir uit adjustments in this se tion.
Test Equipment Required: 1. Pattern generator 2. Frequen y ounter 3. Digital multimeter 4. Audio os illator
RM-Y155
MUTING
DISPLAY
1
2
3
4
5
6
8
0
VOLUME (+)
POWER
ENTER
(Enter into
memory)
(Servi e Mode)
Disp. (Item up)
(Devi e Item Up)
Disp. (Item down)
(Initialize)
(Servi e Mode)
Item (Data up)
Item (Data down)
(Devi e item down)
(Enter into
memory)
(Remove from
memory)
(Servi e Mode)

— 17 —
KV-20S90 / 21SE43C
ADJUSTMENT ITEMS (1 F 2)
Reg # ITEM FUNCTI N
DATA
RANGE
INITIAL
DATA VIDE
AVERAGE
DATA
1 HSIZ Horizontal Amp. Adjustment 0-31 31 31
2 HPOS Horizontal Position Adjustment 0-31 21 20
3 VBOW Verti al Line Bowing Adj. 0-15 6 6
4 VANG Verti al line Bowing Slant Adj. 0-15 6 6
5 TRAP Horizontal Trapezoid Adj. 0-15 15 15
6 PAMP Horizontal PIN Distortion Adj. 0-31 31 31
7 CPIN SAME AS PAMP-SCRN TP/BTM 0-31 31 31
8 VSIZ Verti al Amp. Adjustment 0-31 43 37
9 VPOS Verti al Position Adj. 0-31 35 38
10 VLIN Verti al Linearity Adj. 0-15 7 7
11 SCOR Verti al Amount Adj. 0-15 7 7
12 VZOM Verti al Zooming 0,1 0 0
13 EHT Verti al High-Voltage Corre tion 0-15 15 4
14 ASP Aspe t Ratio Control 0-63 47 47
15 SCRL 16:9 CRT Z Mode Trans. S roll 0-31 31 31
16 HBLK RGB Out Width Control 0,1 1 1
17 LBLK Left S reen HBLK Control 0-15 15 15
18 RBLK RGT S reen HBLK Control 0-15 3 3
19 VUSN V Saw Waveform Compress 0,1 0 0
20 HDW Horizontal Drive Pulse Width 0,1 1 0
21 EWDC EW/ D.C. Adjustment 0,1 0 0
22 LVLN Lower S reen BTM Verti al Line Adj. 0-15 0 0
23 UVLN Upper S reen Top Verti al Line Adj. 0-15 0 0
24 RDRV R Output Drive Control 0-31 30 27
25 GDRV G Output Drive Control 0-31 24 22
26 BDRV B Output Drive Control 0-31 21 22
27 RCUT R Output Cutoff Control 0-15 10 9
28 GCUT G Output Cutoff Control 0-15 7 4
29 BCUT B Output Cutoff Control 0-15 7 4
30 DCOL Dynami Color On/Off 0,1 0 0
31 SHUE Sub HUE 0-15 15 18
32 SCOL Sub Color 0-15 14 18
33 SBRT Sub BRIGHTNESS 0-15 7 10
34 RON R Output On/Off 0,1 1 1
35 GON G Output On/Off 0,1 1 1
36 BON B Output On/Off 0,1 1 1
37 AXPL Axis PAL 0,1 0 0
38 AXNT Axis NTSC 6.00 ± 0.8 0 0
39 CBPF Chroma BPF On/Off 0,1 1 1
40 CTRP Y TRAP FILTER On/Off 6.00 ± 0.9 0 1
41 COFF Color On/Off 0,1 0 0
42 KOFF Set Color Killer 6.00 ± 0.8 0 0
43 SSHP Sub SHARPNESS 0-15 9 6
44 SHPF SHARPNESS Cir uit Fo 0,1 1 1 *
45 PREL Pre-Shoot / Over-Shoot Swit hing 0,1 1 1
46 Y-DC Axis NTSC 0,1 1 1
47 GAMM Chroma BPF On/Off 0,1 0 0
48 VTH Color On/Off 0,1 1 1
49 ABLM ABL Control Mode 0,1 1 1
50 YDEL Set Color Killer 0,1 7 7
51 NCOL Sub Sharpness 0-15 1 1
* = TV/VIDEO = 0

— 18 —
KV-20S90 / 21SE43C
Fun tion
Mode
SERVICE
Data
ID0 25
Notes:
No. 1-78 show the order that ea h adjustment mode may be sele ted while in Servi e Mode.
Data Range shows the range of possible setting for ea h Adjustment Mode.
Initial Data shows the standard settings for ea h Adjustment Mode.
Reg # ITEM FUNCTI N
DATA
RANGE
INITIAL
DATA VIDE
AVERAGE
DATA
52 FSC G Output On/Off 0,1 0 1
53 K-ID B Output On/Off 0,1 0 0
54 HOSC Horizontal VCO Os illation Freq. 0-15 10 7
55 VSS Verti al Syn Sli e Level 0,1 0 0
56 HSS Horizontal Syn Sli e Level 0,1 0 0
57 HMSK HMASK On/Off 0,1 1 1
58 VTMS Sele t Signal VTIM Pin 0-3 0 0
59 CDMD Verti al Count Down Mode Swit hing 0-3 3 3 **
60 AFC AFC Loop Gain Swit hing 0-3 0 0 *
61 FIFR Field Frequen y 0-3 3 3
62 SBAS Sub Bass 0-15 8 8
63 STRE Sub Treble 0-15 9 9
64 SBAL Sub Balan e 0-15 13 13
65 DISP O.S.D Display Position 0-127 15 5
66 PADJ POWER ADJUSTMENT 0-63 51 42
67 HCHM H SYNCH SEP. LIMIT FOR TUNER 0-127 69 69
68 HCLM H SYNCH SEP. LIMIT FOR TUNER 0-127 16 16
69 HCHS H SYNCH SEP. LIMIT FOR VIDEO 0-127 69 69
70 HCLS H SYNCH SEP. LIMIT FOR VIDEO 0-127 16 16
71 ID0 0-255 SEE ID MAP
72 ID1 0-255 SEE ID MAP
73 ID2 0-255 SEE ID MAP
74 ID3 0-255 SEE ID MAP
75 ID4 0-255 SEE ID MAP
76 ID5 0-255 SEE ID MAP
77 ID6 0-255 SEE ID MAP
78 ID7 0-255 SEE ID MAP
* = TV/VIDEO = 0
** = TV = 0, VIDEO = 1
Model Destination ID-0 ID-1 ID-2 ID-3 ID-4 ID-5 ID-6 ID-7
KV-20S90 US 25 3 1 227 3100
KV-21SE43C E 17 3 1 195 115 1 0 0
ID MAP
ADJUSTMENT ITEMS (2 F 2)
4-4. A B ARD ADJUSTMENTS
H. FREQUENCY ADJUSTMENT
1. InputTV mode (RF) with no signal.
2. Set to Servi e Adjustment Mode.
3. Conne t a frequen y ounter to base of Q501
(TP-500 H. DRIVE).
4. Che k H. Frequen y for 15735 ± 200 Hz.
5. Press MUTING then ENTER to save into the memory.

— 19 —
KV-20S90 / 21SE43C
V. FREQUENCY CHECK
1. Sele t video 1 with no signal input.
2. Set the onditions for a standard setting.
3. Conne t the frequen y ounter to TP-508 or CN501 pin 6(V DY+)
onne tor and ground.
4. Che k that V. Frequen y shows 60 ± 4 Hz.
SUB C NTRAST ADJUSTMENT (RDRV)
1. Input a olor-bar signal.
2. Set the red olor on (1).
3. Set in Servi e Adjustment Mode.
4. Sele t the item DCOL level to 0.
5. Set the onditions as follows:
PICTURE: MAX
COLOR: MIN
BRIGHT: CENTER
R ON: ON (1)
G ON: OFF (0)
B ON: OFF (0)
Display
Item
Mode
26
SERVICE RON
1: ON
0: OFF
6. Conne t an os illos ope probe to CN301 pin 2 (Red Out) and
ground .
7. Sele t RDRV with 1 and 4 .
8. Adjust the value of RDRV with 3 and 6 for
1.50 ± 0.05 Vpp.
1.50 ± 0.05 Vpp
White
Bla k
9. Reset the item DCOL to 1.
10. Press MUTING then ENTER to save into the memory.
11. Return the following ba k to normal after adjustment.
PICTURE: MAX
COLOR: CENTER
BRIGHT: CENTER
R ON: ON (1)
G ON: OFF (1)
B ON: OFF (1)
DISPLAY P SITI N ADJUSTMENT (DISP)
1. Input a olor-bar signal.
2. Set to Servi e Adjustment Mode.
3. Sele t DISP with 1 and 4 .
4. Adjust values of DISP with 3 and 6 to adjust hara ters to the enter.
5. Write to memory by pressing MUTING then ENTER .
6. Che k to see if the text is displayed on the s reen.
Display
Item
Mode
Item
Data
SERVICE DISP 15
SUB BRIGHT ADJUSTMENT (SBRT)
1. Input a rosshat h signal.
2. Set to Servi e Adjustment Mode.
3. Set the PICTURE and BRIGHTNESS to minimum.
4. Sele t the SBRT item with 1 and 4 .
5. Adjust the values of SBRT with 3 and 6 to obtain a faintly visible
rosshat h.
6. Press MUTING then ENTER to save into the memory.
SUB HUE, SUB C L R ADJUSTMENT (SHUE,
SC L)
1. Input a olor-bar signal.
2. Set to Servi e Adjustment Mode.
3. Conne t a probe to TP47B B-OUT (C Board).
4. Measure white V1 and blue V4.
4.1) In rease SCOL Register +1 setp.
STANDARD
|V4 - V1| = ± 0.2Vpp
|V3 - V2| = ± 0.2Vpp
V1 V2 V3 V4
5. Press MUTING then ENTER to save into the memory.