SERVICE MANUAL

COMMANDER DEST CHASSIS NO.

FE-2 CHASSIS

KV-21LT1B KV-21LT1E KV-21LT1K KV-21LT1U

RM-887

French

SCC-Q54C-A

KV-21FT2K

SCC-Q51E-A

Spanish SCC-Q53C-A

SCC-Q51C-A

SCC-Q52C-A

KV-21LT1

RM-889

KV-21FT2

TABLE OF CONTENTS
Section Title Specifications Connectors Self Diagnostic Software 1. GENERAL Switching On the TV and Automatically Tuning.. Introducing the Menu System.. Teletext.. Connecting Optional Equipment.. Using Optional Equipment.. Troubleshooting.. 2. DISASSEMBLY KV-21LT1 2-1. 2-2. 2-3. 2-4. 2-5. 2-6. Rear Cover Removal A Board PWB Removal 1 A Board PWB Removal 2 Service Position Wire Dressing Picture Tube Removal.... 10 11... Page 6 Section Title Page
3. SET-UP ADJUSTMENTS 3-1. Beam Landing 3-2. Convergence 3-3. Focus Adjustment 3-4. Screen (G2), White Balance 4. CIRCUIT ADJUSTMENTS 4-1. Electrical Adjustments 4-2. Test Mode 2 5. DIAGRAMS 5-1. Circuit Board Location 5-2. Block Diagrams 5-3. Schematic Diagrams and Printed Wiring Boards * C Board * A Board 5-4. Semiconductors 5-5. IC Blocks 6. EXPLODED VIEWS 6-1. Chassis (KV-21LT1) Chassis (KV-21FT2) 6-2. Picture Tube(KV-21LT1) Picture Tube(KV-21FT2) 7. ELECTRICAL PARTS LIST
KV-21FT2 2-7. 2-8. 2-9. 2-10. 2-11. Rear Cover Removal Chassis Removal Service Position Wire Dressing Picture Tube Removal... 15
ATTENTION APRES AVOIR DECONNECTE LE CAP DELANODE, COURT-CIRCUITER LANODE DU TUBE CATHODIQUE ET CELUI DE LANODE DU CAP AU CHASSIS METALLIQUE DE LAPPAREIL, OU AU COUCHE DE CARBONE PEINTE SUR LE TUBE CATHODIQUE OU AU BLINDAGE DU TUBE CATHODIQUE.
CAUTION SHORT CIRCUIT THE ANODE OF THE PICTURE TUBE AND THE ANODE CAP TO THE METAL CHASSIS, CRT SHIELD, OR THE CARBON PAINTED ON THE CRT, AFTER REMOVAL OF THE ANODE CAP.
ATTENTION !! AFIN DEVITER TOUT RISQUE DELECTROCUTION PROVENANT DUN CHSSIS SOUS TENTION, UN TRANSFORMATEUR DISOLEMENT DOIT ETRE UTILIS LORS DE TOUT DPANNAGE LE CHSSIS DE CE RCEPTEUR EST DIRECTMENT RACCORD LALIMENTATION SECTEUR.
WARNING !! AN ISOLATION TRANSFORMER SHOULD BE USED DURING ANY SERVICE WORK TO AVOID POSSIBLE SHOCK HAZARD DUE TO LIVE CHASSIS, THE CHASSIS OF THIS RECEIVER IS DIRECTLY CONNECTED TO THE POWER LINE.
ATTENTION AUX COMPOSANTS RELATIFS LA SECURIT!! SAFETY-RELATED COMPONENT WARNING !! COMPONENTS IDENTIFIED BY SHADING AND MARKED 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. LES COMPOSANTS IDENTIFIS PAR UNE TRAME ET PAR UNE MARQUE SUR LES SCHMAS DE PRINCIPE, LES VUES EXPLOSES ET LES LISTES DE PIECES SONT DUNE IMPORTANCE CRITIQUE POUR LA SCURIT DU FONCTIONNEMENT, NE LES REMPLACER QUE PAR DES COMPSANTS SONY DONT LE NUMRO DE PICE EST INDIQU DANS LE PRSENT MANUEL OU DANS DES SUPPLMENTS PUBLIS PAR SONY.

ITEM MODEL

Television System

B/G/H, L,I

Spanish

B/G/H, D/K

Channel Coverage VHF : E2-E12, F2-F10 UHF : E21-E69 CABLE TV : S01-S03, S1-S20, B-Q HYPER : S21-S41 L F02-F10, F21-F69 I UHF : B21-B69 VHF : E2-E12 UHF : E21-E69 CABLE TV : S01-S03, S1-S20 HYPER : S21-S41 VHF : E2-E12, R01-R12 UHF : E21-E69, R21-R69 CABLE TV : S01-S03, S1-S20 HYPER : S21-S41 I : UHF B21-B69

Table 1

Error Message No error Reserved OCP ( Over Current Protection ) Reserved No Ver tical Sync Unstable AKB IIC bus clock and/or data lines low at power on NVM no IIC bus acknowledge at power on Not Used Tuner no acknowledge at power on Not used Jungle controller no acknowledge at Power ON LED Code 10 11
How to enter into Table 2 1. 2. Turn on the main power switch of the TV set and enter into the Stanby Mode. Press the following sequence of buttons on the Remote Commander.

(ON SCREEN DISPLAY)

(DIGIT 5)

(VOLUME -) (TV)

The following table will be displayed indicating the error count.
Flash Timing Example : e.g. error number 3 Table 2

StBy LED ON ON ON

ERROR MENU E02 E03 E04 E05 E06 E07 E08 E09 E10 E11 WORKING TIME HOURS MINUTES OCP OVP N/A VSYNC IKR IIC NVM JUNGLE TUNER SOUNDP 8V (0, (0, (0, (0, (0, (0, (0, (0, (0, (0, 255) 255) 255) 255) 255) 255) 255) 255) 255) 255) 0 0
Note: To clear the error count data press 80 on the Remote commander.
The operating instructions mentioned here are partial abstracts from the Operating Instruction Manual. The page numbers of the Operating Instruction Manual remain as in the manual.
Switching On the TV and Automatically Tuning
Please confirm that aerial is connected Confirm
5 A new menu appears on the screen asking you to check
that the aerial is connected. Ensure the aerial is connected and then press the OK button to start the automatic tuning. The TV starts to automatically search and store all available channels (TV Broadcast) for you.
Auto Tuning Programme: System: Channel: Searching. 01 B/G C21
The first time you switch on your TV, a sequence of menu screen appear on the TV enabling you to: 1) choose the language of the menu screen, 2) choose the country in which you wish to operate the TV, 3) search and store all available channels (TV Broadcast) and 4) change the order in which the channels (TV Broadcast) appear on the screen. However, if you need to change the language menu, change or repeat the tuning (e.g. when you move house) or rearrange again the order of the channels afterwards, you can do that by selecting the appropriate menu in the (Set Up). For more information, refer to the Menu Guide section of this instruction manual. You can also do that by pressing the on the TV set. Auto Start Up Button This procedure could take some minutes. Please be patient and do not press any button. Otherwise the automatic tuning will not be completed.

1 Connect the TV plug to the mains socket (220-240V AC, 6

Programme Sorting

50Hz) Press the on/off button on the TV set to turn on the TV. The first time you press this button, a Language menu displays automatically on the TV screen. After all available channels are captioned and stored, the Programme Sorting menu appears automatically on the screen enabling you to change the order in which the channels appear on the screen.
a) If you do not wish to change the channel order, go to

step 7.

Programme: 01 TVE 02 TVETVCCC58 Select channel: Exit: MENU

Language

b) If you wish to change the channel order:

SECTION 1 GENERAL

English Espaol Franais Italiano Magyar Nederlands Select Language:

2 Press the

1 Press the or button to select the programme number with the channel (TV Broadcast) you wish to rearrange, then press the button.
or button on the remote control to select the language, then press the OK button to confirm your selection. From now on all the menus will appear in the selected language.
Programme: 01 TVE 02 TVETVCCC58
05 Select new position: Exit: MENU C27
2 Press the or button to select the new programme number position for your selected channel (TV Broadcast), then press. 3 Repeat steps b)1 and b)2 if you wish to change the order of the other channels.
3 The Country menu appears automatically on the TV
Country ap esk rep. Magyarorszg Polska Romnia
screen. Press the or button to select the country in which you will operate the TV set, then press the OK button to confirm your selection.

Select country:

7 Press the MENU button to remove the menu from the

screen.

MENU MENU
Select - instead of a country If the country in which you want to use the TV set does not appear in the list. If you do not want your channels (TV Broadcast) stored in a given channel sequence starting from programme position 1.
Your TV is now ready for use
4 The Auto Tuning menu appears on the screen. Press the
Do you want to start automatic tuning? Yes No

OK button to select Yes.

continued.

First Time Operation

Introducing and Using the Menu System
Picture Adjustment Mode: Personal Contrast Brightness Colour Sharpness Hue Reset

Level 1

SLEEP TIMER The Sleep Timer option in the Timer menu allows you to select a time period for the TV to switch itself automatically into the standby mode.

Off Off

Level 2

Level 3 / Function

Your TV uses an on-screen menu system to guide you through the operations. Use the following buttons on the Remote Control to operate the menu system:
1 Press the MENU button to switch the first level menu on.
Timer Sleep Timer: On Timer:

Sleep Timer: On Timer:

To do that: after selecting the option, press and then proceed in the same way as in the steps 2 and 3 of the section Switching On the TV and Automatically Tuning.

Menu System

AUTO TUNING The Auto Tuning option in the Set Up menu allows you to automatically search for and store all available TV channels.
Language/Country Auto Tuning Programme Sorting Manual Programme Preset Advanced Features

Set Up

To do that: after selecting the option, press and then proceed in the same way as in TV steps 4 and 5 of the section Switching On the TV and Automatically Tuning.
3 After selecting the Channel option, press. Then press or to select the channel tuning (C for terrestrial channels or S for cable channels). Next press. After that, press the number buttons to enter directly the channel number of the TV Broadcast or the channel of the VCR signal. If you do not know the channel number, press or to search for it. When you tune the desired channel, press OK twice to store. Repeat all the above steps to tune and store more channels.

Manual Programme Preset

b)Normally the automatic fine tuning (AFT) is
PROGRAMME SORTING The Programme Sorting option in the Set Up menu allows you to change the order in which the channels (TV Broadcast) appear on the screen. To do that: after selecting the option, press and then proceed in the same way as in step 6 b) of the section Switching On the TV and Automatically Tuning.
Programme: System: Channel: Label: AFT: Skip: Decoder: Confirm 01 B/G C 21 --TVE On No Off
operating, however you can manually fine tune the TV to obtain a better picture reception in the case that the picture is distorted.
To do that: while watching the channel (TV Broadcast) you wish to fine tune, select the AFT option and press. Next press or to adjust the fine tuning between -15 and +15. Finally press OK twice to store.
MANUAL PROGRAMME PRESET The Manual Programme Preset option in the Set Up menu allows you to:
c) Skip any unwanted programme numbers
when they are selected with the PROGR +/buttons.
a) Preset channels or a video input source one
by one to the programme order of your choice. To do that:
To do that: Highlighting the Programme option, press the PROGR +/- button to select the programme number you want to skip. When the programme you want to skip appears on the screen, select the Skip option and press. Next press or to select Yes. Finally press OK twice to confirm and store. To cancel this function afterwards, select No instead of Yes in the step above.
Programme: System: Channel: Label: AFT: Skip: Decoder: Confirm
01 B/G C 21 --TVE On No Off

1 After selecting the Manual Programme Preset option, press then with Programme option highlighted press. Press or to select on which programme number you want to preset the channel (for VCR, select programme number 0). Then press.
d) Label a channel using up to five characters.
2 After selecting the System option, press. Then press or to select the TV Broadcast system (B/G for western European countries or D/K for eastern European countries). Then press.
To do that: Highlighting the Programme option, press the PROGR +/- button to select the programme number with the channel you wish to name. When the programme you want to name appears on the screen, select the Label option and press. Next to select a letter, number or press or - for a blank. Press to confirm this character. Select the other four characters in the same way. After selecting all the characters, press OK twice to store. continued.

Teletext

Using the following instructions, you can connect a wide range of optional equipment to your TV set. (Connecting cables are not supplied).
Connecting Optional Equipment
Teletext is an information service transmitted by most TV stations. The index page of the teletext service (usually page 100) gives you information on how to use the service. To operate teletext, use the remote control buttons as indicated below.
Make sure to use a channel (TV Broadcast) with a strong signal, otherwise teletext errors may occur.
To Switch On Teletext : After select the channel (TV Broadcast) which carries the teletext you wish to view, press.

TELETEXT

Index Programme News Sport Weather 101 98

8mm/Hi8/DVC camcorder C

To Select a Teletext page: Input 3 digits for the page number, using the numbered buttons. If you have made a mistake, retype the correct page number. If the counter on the screen continues searching, it is because this page is not available. In that case, input another page number A B

PlayStation**

To access the next or preceding page: Press PROGR + ( ) or PROGR - ( ).
To superimpose teletext on to the TV: Whilst you are viewing teletext, press
Connecting a VCR: To connect a VCR, please refer to the section Connecting the aerial and VCR of this instruction manual. We recommend you connect your VCR using a scart lead. If you do not have a scart lead, tune in the VCR test signal to TV programme number 0. by using Manual Programme Preset option. (for details how to manual programme, see page 11, step a). Also refer to your VCR instruction manual to find out how to find the output channel of your VCR. VCR

Carry out the adjustments in the following order : 3-1. Beam Landing. 3-2. Convergence. 3-3. Focus. 3-4. White Balance. Note : Test equipment required. 1. Color bar/pattern generator. 2. Degausser. 3. Oscilloscope. 4. Digital multimeter.
Preparation: In order to reduce the influence of geomagnetism on the sets picture tube, face it in an easterly or westerly direction. Switch on the sets power and degauss with the degausser.

Fig. 3-2.

Purity

3-1. Beam Landing

1. 2. 3. Input an all white signal from the pattern generator. Set the Contrast and Brightness to normal. Set the pattern generator raster signal to Red. Move the deflection yoke forward and adjust with the purity control so that the Red is at the centre and the Blue and Green take up equally sized areas on each side of the screen. [See Fig.3-1 - 3-3]. Move the deflection yoke backwards and adjust so that the entire screen becomes Red. [See Fig.3-1] Switch the raster signal to Blue, then to Green and verify the condition. When the position of the deflection yoke has been determined, fasten the deflection yoke with the screws. If the beam does not land correctly in all the corners, use a magnet to correct it. [See Fig.3-4]

Fig. 3-3.

GREEN RED BLUE

4. 5. 6. 7.

Purity control corrects this area
Disk magnets or rotatable disk magnets correct these areas (a-d)
Deflection yoke positioning corrects these areas

Fig. 3-1.

Caution : High voltages are present on the Deflection yoke terminals - take care when handling the Deflection yoke whilst carrying out adjustments.

Disk Magnets

Fig.3-4

3-2. Convergence

Preparation:
If the V.STAT magnet is moved in the direction of the (a) and (b) arrows, the Red, Green and Blue points move as indicated below.
Before starting this adjustment, adjust the focus, horizontal size and vertical size. Minimize the Brightness setting. Input a dot pattern from the pattern generator.

b a a b

Horizontal and Vertical Static Convergence

Center dot

H.STAT convergence control
V.STAT Vertical Static Magnet
RV5375 (H STAT) H STAT Convergence (on mount side)

B G B R

Fig.3-5
[Moving horizontally], adjust the H.STAT control so that the Red, Green and Blue points are on top of each other at the centre of the screen. [Moving vertically], adjust the V.STAT magnet so that the Red, Green and Blue points are on top of each other at the centre of the screen. If the H.STAT variable resistor is unable to bring the Red, Green and Blue points together at the centre of the screen, adjust the horizontal convergence with the H.STAT variable resistor and the V.STAT magnet in the manner indicated below. [In this case, the H.STAT variable resistor and the V.STAT magnet influence each other].

Operation of the BMC (Hexapole) magnet.

R G B R G B R G B

Tilt the V.STAT magnet and adjust the static convergence by opening or closing the V.STAT magnet. The movement of the magnets interact with each other and so the respective dot position should be monitored while carrying out this adjustment. Use the H.STAT VR to adjust the Red, Green and Blue dots so that they coincide at the centre of the screen (by moving the dots in the horizontal direction).
Geometry Adjustment. Preparation:

YCH Adjustment

YCH VR
Before starting this adjustment, adjust the horizontal and vertical static convergence. 1. 2. Remove the deflection yoke spacer. Tilt the deflection yoke as indicated in the figure below and optimise the geometry. Tilting the DY Up and Down will balance the upper and lower pin adjustment. Tilting the DY Left and Right will balance the H-Trap adjustment. Re-install the deflection yoke spacer.

Deflection Yoke

TLV Adjustment

TLV VR

Screen Corner Convergence If you are unable to adjust the corner convergence properly, this can be corrected with the use of permalloy magnets.
a-d: screen-corner convergence defect c d
Tilt Direction HTIL Adjustment
Install the permalloy assembly for the area that needs correcting.

TLH pieces

HTIL correction can be performed by adding a TLH correction assembly to the Deflection yoke.
Permalloy Assy X-4387-214-1
Convergence adjustment with permalloy

Layout of each control

3-4. Screen (G2), White Balance
[Adjustment in the service mode using the remote commander] G2 adjustment 1. 2. 3. Input a dot signal from the pattern generator. Set the Picture, Brightness and Colour to minimum. Apply 175V DC from an external power supply to the R, G and B cathodes of the CRT. Whilst watching the picture, adjust the G2 control [SCREEN] located on the Flyback Transformer to the point just before the flyback return lines disappear. White balance adjustment for TV mode 1. 2. Input an all-white signal from the pattern generator. Enter into the Service Mode by pressing TEST, TEST and MENU on the Service Commander. 3. Select Service from the on screen menu display and press the right arrow button on the remote commander. 4. The Service menu will appear on the screen. [See Page 18] 5. Set the Contrast to MAX. 6. Set the R-Drive to 25. 7. Adjust the G-Drive and the B-Drive so that the white balance becomes optimum. 8. Press the OK button to write the data for each item. 9. Set the Contrast to MIN. 10. Adjust the G-Cutoff, and the R-Cutoff with the left and right buttons on the remote commander so that the white balance becomes optimum. 11. Press the OK button to write the data for each item.

IF ADJUST AGC Adjust Automute Audio Gain L Gating (0, 255) (0, 255) (0, 255) (0, 255) 0 1
Sub Brightness Adjustment 1. 2. 3. Input a Monoscope pattern. Press TEST TEST 13 on the Remote Commander. Adjust the Sub-Brightness data so that there is barely a difference between the 0 IRE and 10 IRE signal levels.
Sub Contrast Adjustment 1. 2. 3. Input a video signal that contains a small 100% white area on a black background. Connect an digital voltmeter to Pin 10 of J701 [C Board]. Adjust the Sub-Contrast [TT11] to obtain a voltage of 95 +0,- 5V.
Sub Colour Adjustment [ Print side of A board ] 1. 2. 3. 4. Receive a PAL colour bar signal. Connect an oscilloscope to Pin 3 of CN504 [A Board]. Enter into the Service service menu. Adjust the Sub Colour data so that the Cyan, Magenta and Blue colour bars are of equal levels as indicated below. Note: Ensure that no signal is applied to the Antenna socket while carrying out the following IF adjustments. 1. 2.
Deflection System Adjustment Enter into the Geometry service menu. Select and adjust each item in order to obtain the optimum image.

Same Level

B-Out Waveform
Tuner AGC Adjustment 1. Set the AGC adjust register value : For destination France set the value to 6. All other destinations set the value to 0. 2. 3. 4. 5. 6. 7. Receive a signal of 64dBuV / 75 ohm terminated [62dBuV / 75 ohms for B model] via the tuner antenna socket. Connect a voltmeter to pin1 of TU101 [print side of A Board] or to the AGC pin of CN001 [mount side of A Board]. Confirm that the AGC voltage is 3.5volts +/- 0.3volts. If adjustment is required, enter into the Test Menu. Select the AGC Adjust menu item. Adjust the data using the left and right arrow buttons on the Remote Commander to obtain a voltage of 3.5V +/- 0.3V.

V SIZE

4-2. TEST MODE 2:
Is available by pressing the TEST button twice, OSD TT appears. The functions described below are available by selecting the two numbers. To release the Test mode 2, press 00, 10, 20. twice or switch the TV set into Stand-by mode. In TT Menu mode, it is possible to remove the Menu from the screen by pressing the Speaker Off button once. Pressing the Speaker OFF button a second time will cause the Menu to reappear. The function is kept even when the menu is not displayed on screen !!.

S CORRECTION

V CENTRE

H CENTRE

H SIZE

PIN AMP

PIN PHASE

CORNER PIN

V ANGLE
'TT' mode off Picture maximum Picture minimum Set speaker/headphone Volume to 35% Set speaker/headphone Volume to 50% Set speaker/headphone Volume to 65% Set speaker/headphone Volume to 80% Ageing mode Shipping Condition Sub picture adjustment Sub colour adjustment Sub Brightness adjustment Text H Position adjustment Picture Rotation Test Picture level 50% Toggle Factory Mode Destination ADE Destination BL Destination ADE Destination U Destination ADE Destination BL Destination KR Destination KR Auto Sutoff Disable/Enable Rotation ON/OFF No Function No Function Enter G2 Adjustment Re-initialise NVM (Prog 59) Re-initialise geometry (Prog 59) Set NVM as non virgin (Prog 59) Set NVM as virgin (Prog 59) Auto AGC adjustment No Function Enable/disable RGB priority RGB auto-detect enable/disable On timer enable/disable Manual AGC adjustment Enable/disable X26 countermeasure (N problem) Force PAL video (Factory Use Only) Un-force PAL(restore normal video condition) Local keys test No Function Enable/disable watchdog Display Error and Working Time menu

CN001 TO SPEAKERS
S601 PH601 ISOLATOR VD+ VP
5 IC604 DUAL DC REGULATOR

+3.3V STBY

XTAL IN 63

XTAL OUT 64

J1200 CN601

1 LOWB IN BOOST V- DY3

OUT V DY H- DY+ H- DYH DY V- DYV- DY+ 6 V- DY+

IC501 V OUTPUT

IC002 REMOTE CONTROL RECEIVER

REF H- DYH- DY-

IC201 AUDIO AMP

DY ASSY

+5V STBY

AUD OUT/CV6520 48

1 IN/INL
LINE FILTER T601 RELAY RY601

MAIN RECT D601

OUT/L 14

AUDIO MUTE 5

10 MUTE

TU101 CN603

H- DY+ ICDGC CHECK
LOWB 1 H- DY+ VD 18 VGCH D608 DGC

MUTE SW Q212

DGC CHECK

FB T603 SRT

79 NVM WP

71 SCL

DGC VSENSE D116 +B

D617 EW

IC531 PIN CORRECTION

72 SDA

36 CVBS2/ CVBSY2
+5V STBY 3 RT TIMER +B VG(G) 12

IC603 ERROR AMP

PIN OUT Q532
FUNCTION SWITCH S001 - S006

KEY/CS

J401 (2/2)

HP PROTECT

J401 (1/2)

+5V STBY SS OCP VS 15

D639 RECT AUDIO VCC D619

R DRIVE, BKG Q702, 703

R OUT Q704 TO A BOARD CN504

BLUE IN

53 B2/UIN

IC401 AV LINK A19

RELAY SWITCH Q601 CN504

80 MODE2

G DRIVE, BKG Q705, 706

G OUT Q 707

PICTURE TUBE

GREEN IN

RED D618

52 G2/YIN

RED IN

51 R2/VIN

BLUE VM VCC IK

TO C BOARD CN703

D622 D624 T511 FBT HV

B DRIVE, BKG Q708, 709

B OUT Q710

R G C 2 V

G 4 H V

46 -/C4

50 INSSW2

V IN 1

EWD 17

40 CVBS1 2

QCP DETECT Q612, 602

Y/V IN 2

VD- 18

45 -/CVBS4Y4

TO PICTURE TUBE

TO A BOARD CN502

H2 RCV RV702

VD+ 19

IC003 RESET

65 KEY/CS

C D +B FV

ABL 54

32 AUDIO 1

IC609 STANDBY POWER

TO C BOARD CN706

CN706 TO T511 FBT

H STAT

G2 1000V G2

7 HP D632 RECT IC608

ROT COIL 73

NSC CORRECT

L 3.3V REG

T531 HDT HD STBY +3.3V

29 AUDIO 2

TO C BOARD CN1705 D571, Q571,574

42 CVBS3

STBY 70

CN1801 CN1705

BUFFER Q401,411 H-DRIVE Q535 H-OUT Q533

IC1801

D513 +15V RECT

TO A BOARD CN510

TO ROTATION COIL

TO A BOARD T511 (FBT)

D514 -15V RECT

H1 200V 5 1

TO C BOARD CN707
POWER SUPPLY, DEFLECTION, SMALL SIGNAL BOARD, AUDIO AMPLIFIER

C [ R, G, B OUT ]

A G B C D E F H I J K L M

PRINTED WIRING BOARD ]

A board IC Voltage Table
IC Voltage Table Ref No Pin No Voltage (V) 0 3.2 2.12 2.0 2.3 8.0 IC001 5.4.0 1.4 1.3.8 3.8 5.IC34 3.5 3.6 1.9 0.3 3.6 1.1.4 3.9 1.8 3.3 3.49 1.0 3.6 2.8 2.51
20us/div 20us/div 20us/div 5ms/div
A board Semiconductor Voltage Table
Ref Q013 (e) 0 (b) 0.7 (c) 0 Ref Q604 (e) 0 (b) 0 (c) 2. 5

Ref No

Pin No Voltage (V)

Q0 3.3 Q0 5. 6

ICICIC12 0.2 2.2.5 2.5 2.56 5.2 3.58 3.1 3.62 3.IC12 14

4.8 0.4 0

Q212 Q401 Q411

0 4.8 1.1

0.7 4.2 1.7

0 1.8 4.2

Q601 5.6 4.8 5.3 Q606 10.4.5 86.7
Q602 14.2 5.Q607 -82.4 -79.9 10.9

QQ0 2.5 95.2

7.1 5.0 8.1 -3.3.2 3.0.3 -12.6 0.2 13. 9 0.3 1. 4 2. 3 1.8 2. 4 1.6 6. 4 -80.4 -80.5 -80.2 -80.2 -81.5 -81.6 -77.8 -81.8 -76 -81.9 -79.4 16.14.4 86. 4. 0 11. 3 0. 0 11.35

A board Location Table

DIODE D001 D002 D003 D004 D006 D007 D008 D010 D011 D012 D013 D014 D016 D017 D018 D019 D020 D035 D036 D051 D101 D103 D104 D210 D211 D212 D402 D404 D405 D406 D407 D408 D412 D414 D420 D421 D423 D424 J-2 J-4 J-2 M-8 M-8 J-2 L-1 G-2 H-2 J-2 M-8 M-8 J-2 L-1 G-2 L-1 M-8 L-2 L-2 K-1 B-1 E-2 E-2 I-5 I-5 I-5 B-2 I-2 B-2 B-2 B-3 B-2 C-3 B-3 B-1 C-2 B-2 M-2 D435 D436 D501 D502 D503 D504 D505 D506 D507 D512 D513 D514 D534 D535 D536 D537 D538 D539 D573 D601 D602 D604 D610 D611 D612 D613 D614 D615 D616 D617 D618 D619 D620 D621 D623 D627 D631 D632 D633 A-2 A-3 D-9 D-9 I-1 H-2 J-1 D-5 J-1 D-8 D-9 C-9 D-4 E-6 B-6 C-4 F-6 B-5 F-5 I-9 K-5 F-9 J-5 G-5 G-5 J-6 K-8 H-5 G-6 G-6 H-6 H-6 M-5 J-5 J-5 K-7 L-6 L-5 L-5 IC001 IC002 IC003 IC004 IC401 IC501 IC531 IC601 IC602 IC604 IC608 IC609 IC1201 Q013 Q016 Q212 Q401 Q411 Q532 Q533 Q535 Q601 Q602 Q603 Q604 Q606 Q607 Q608 Q609 D634 D639 D640 D1201 D1203 D1204 IC K-2 M-8 I-2 K-4 I-2 D - 10 E-4 F - 10 F-7 H-5 L-6 L-6 H-4 TRANSISTOR K-3 I-3 I-5 C-1 D-1 D-4 A-6 B-4 K-5 G-5 G-5 G-5 G - 10 G-9 J-6 J-6 F - 10 I-6 L-5 H-1 I-4 H-4

C board Waveforms

20us/div 20us/div 20us/div 20us/div

A board Waveforms

TP2 TP3 TP4

10us/div

20us/div

1.77 Vp-p (H)

TP6 TP7 TP8

1.88 Vp-p (H)

1.84 Vp-p (H)

1.86 Vp-p (H)

6.0 Vp-p (H)

TP4 TP4

5.4 Vp-p (H)

5ms/div 20us/div

1.88 Vp-p (H) 16.8 Vp-p (H) 1.83 Vp-p (V) 49.8 Vp-p (V)

74 Vp-p (H)

5ms/div
C board Semiconductor Voltage Table

C board IC Voltage Table

IC Voltage Table
74 Vp-p (H) 488 mVp-p (V) 1.06 kVp-p (H) 50.8 Vp-p (V)

124.2 124.8

125.8 126.4 201.9
Ref No Pin No Voltage (V)

124.6 125.8

133.0 132.4 201.9
[ A PRINTED WIRING BOARD ]

132.3 131.5

125.8 125.0

123.0 124.3

124.2 123.4

4.1 4.1 7.0 8.0

1.76 Vp-p (H)
Portions of the circuit marked as shown are high voltage areas. Use care to prevent electric shock during inspection or repair.

C D E F G

S T U V W

KV-21LT1B

KV-21LT1E

KV-21LT1K

KV-21LT1U

1000uF

JW 5.0mm

2200uF

PLUG, CONNECTOR 3P

PLUG, CONNECTOR 4P

BTF-EF411

BTF-EC401

BTF-EP401

BTF-EU601

H I J K L M N O P Q R S T U V W X

5-4. SEMICONDUCTORS

LM393DT TDA2822M TEA2124

( TOP VIEW )

DTA144ESA DTA144ESA-TP DTC114EKA DTC114EKA-T146 DTC143TKA-T146 DTC144EKA-T-146R 2SA1037K-T-146-R R2SA1162-G 2SA1037K-T-146-QR 2SD601A-QTX 2SC1623-L5-L6 2SC2412K-QR 2SC2412K-T-146-R

2SK2251-01-F19

SE-135N SE135N-LF12

1 V OUT 2 V IN 3 GND

IRF614-LF
AK04-V1 AU-01Z-V1 BYD33G BYD33GAMMO DINL20-U-TA2 DINL40-U-TR2 ERB44-06TP1 EGP20G EG-1Z-V1 EL1Z ERD28-06S
ERD28-06S ERC06-15SL FMN-G12S GP08DPKG23 RG1CLF-B1 RGP10GPKG23 RU-3AM RU3YX-LF-C4 RU3YX-V1 RU-4AM-T3 1SS292T-77

TDA9392H

CATHODE
2SA933AS-QRT 2SAG33ASQT 2SA933AS-RT 2SC1740S-RT

LETTER SIDE

DAN202K DAN202K-T146

TOP209P

D4SB60L-F BF421-AMMO 2SA1091-O 2SC2785-HFE

PART.NO *A-1632-893-A *A-1632-880-A *A-1632-892-A *A-1632-894-A *4-204-143-02 4-205-362-01 7-685-663-71
DESCRIPTION REMARK A BOARD, COMPLETE (KV-21LT1B) A BOARD, COMPLETE (KV-21LT1E) A BOARD, COMPLETE (KV-21LT1K) A BOARD, COMPLETE (KV-21LT1U) BRACKET, MAIN REAR COVER SCREW +BVTP 4X16 TYPE 2 IT-3
6-2. KV-21LT1 PICTURE TUBE

REF. NO. 63 64

PART.NO X-4200-621-1 4-047-464-01 4-205-364-01 4-205-365-01 4-205-376-01 4-205-550-01 4-205-363-01 4-204-426-01 4-205-375-01 4-204-666-01 8-738-836-05 8-451-505-11 1-452-728-61 *A-1639-004-A

DESCRIPTION

REMARK

REF. NO. 77

PART.NO 4-369-318-21 1-419-187-11 *4-204-900-01 *4-202-554-01 1-251-839-21 3-704-495-01 4-365-808-01 1-529-711-11 4-308-870-00 1-452-094-00 1-452-032-00 X-4387-214-1 3-701-007-00
BEZNET ASSY 52-59 CATCHER, PUSH DOOR SHAFT DOOR MULTI BUTTON COVER MULTI BUTTON BUTTON, POWER SPRING GUIDE, LIGHT SHEET, BLOTTING PICTURE TUBE (A51LPT60X) (SD-313) DEFLECTION YOKE (Y21RSA-S) COIL, NA ROTATION (RT-154) C BOARD, COMPLETE 43
SPRING, TENSION COIL, DEGAUSSING BAND, DGC HOLDER, HV CABLE CAP ASSY, HIGH VOLTAGE SPACER, DY SCREW (5), TAPPING SPEAKER, (8CM) CLIP, LEAD WIRE MAGNET, ROTATABLE DISK; 15MM MAGNET, DISK; 10MM PERMALLOY ASSY, CORRECTION BAND, BINDING

6-3. KV-21FT2 CHASSIS

REF. NO. 5
PART.NO 1-571-433-21 *4-202-531-01 1-765-286-11 *4-204-517-03 1-453-345-11

REF. NO. 10 44

PART.NO 8-598-537-00 *A-1632-898-A *4-204-143-11 4-205-399-01 7-685-663-71
SWITCH, PUSH (AC POWER) AC CORD LOCK (SC) CORD, POWER SUPPORT, FBT TRANSFORMER ASSY, FLYBACK (NX1748//M3A4)
FRONTEND BTF-EP401 A BOARD, COMPLETE BRACKET, MAIN REAR COVER SCREW +BVTP 4X16 TYPE 2 IT-3
6-4. KV-21FT2 PICTURE TUBE

REF. NO. 63

PART.NO DESCRIPTION REMARK X-4200-622-1 BEZNET ASSY (KV-21LT1) 52-56 4-205-398-01 SPRING, DOOR 4-205-396-11 BUTTON, POWER (BARE) 4-205-392-11 WINDOW ORNAMENTAL (BARE) 4-204-426-01 SPRING 4-205-389-01 GUIDE, LIGHT 4-204-666-01 SHEET, BLOTTING 8-738-836-05 PICTURE TUBE (A51LPT60X) (SD-313) 8-451-505-11 DEFLECTION YOKE (Y21RSA-S) 1-452-728-61 COIL, NA ROTATION (RT-154) *A-1639-004-A C BOARD, COMPLETE 4-369-318-21 SPRING, TENSION 1-419-187-11 COIL, DEGAUSSING 45

REF. NO. 76

PART.NO DESCRIPTION REMARK 4-203-390-11 CUSHION, DGC 4-204-900-01 BAND, DGC 4-202-HOLDER, HV CABLE 1-251-839-21 CAP ASSY, HIGH VOLTAGE 3-704-495-01 SPACER, DY 4-365-808-01 SCREW (5), TAPPING 1-529-710-11 SPEAKER, (5X9CM) 7-685-648-79 SCREW +BVTP 3X12 TYPE 2 IT-3 4-308-870-00 CLIP, LEAD WIRE 1-452-094-00 MAGNET, ROTATABLE DISK; 15MM 1-452-032-00 MAGNET, DISK; 10MM X-4387-214-1 PERMALLOY ASSY, CORRECTION 3-701-007-00 BAND, BINDING

SECTION 7 ELECTRICAL PARTS LIST
PARTS LISTING TABLE OF CONTENTS Page A BOARD COMMON Parts List : A BOARD VARIANT Parts List : Model KV-21LT1 KV-21FT2 C BOARD COMPLETE Parts List : MISCELLANEOUS :.... 53.... 53.... 53.... 55 Parts common to all models listed in this manual.. 47 Parts that belong only to the model specified
ACCESSORIES AND PACKAGING MATERIALS :... 55
Note : Refer to the designated variant parts list when seeking a part indicated by an asterisk (*) Parts indicated (#) on the Schematic Diagram are not used in this model and therefore do not appear in the Parts List.
The components identified by shading and marked are critical for safety Replace only with the part number specified.
REMARK REF. NO. C044 C045 C046 C047 C051 C053 C055 C100 C103 C105 C106 C110 C111 C253 C403 C408 C409 C410 C415 C416 C421 C426 C437 C438 C449 C501 C502 C503 C504 C505 C506 C508 C509 C510 C513 C515 C517 C518 C519 C520 C524 C525 C531 C532 C535 C536 CPART.NO 1-164-346-11 1-164-489-11 1-163-037-11 1-126-935-11 1-163-109-00 1-164-004-11 1-216-295-91 1-126-933-11 1-126-965-11 1-163-021-91 1-126-933-11 1-163-113-00 1-163-113-00 1-164-336-11 1-163-009-11 1-164-348-11 1-126-964-11 1-163-021-91 1-164-346-11 1-126-964-11 1-163-009-11 1-163-009-11 1-164-346-11 1-164-346-11 1-164-492-11 1-126-968-11 1-163-038-91 1-126-968-11 1-106-220-00 1-137-194-81 1-163-021-91 1-163-035-00 1-107-364-11 1-163-005-11 1-128-560-11 1-104-666-11 1-104-666-11 1-106-375-12 1-163-275-11 1-163-038-91 1-216-295-91 1-123-024-21 1-126-964-11 1-163-017-00 1-163-251-11 DESCRIPTION CERAMIC CERAMIC CERAMIC ELECT CERAMIC CHIP 1UF CHIP 0.22UF CHIP 0.022UF 470UF CHIP 47PF REMARK 10.00% 10.00% 20.00% 5.00% 16V 16V 50V 16V 50V

REF. NO.

PART.NO
*A-1632-893-A *A-1632-880-A *A-1632-892-A *A-1632-894-A *A-1632-898-A
A Board, Complete (KV-21LT1B) A Board, Complete (KV-21LT1E) A Board, Complete (KV-21LT1K) A Board, Complete (KV-21LT1U) A Board, Complete (KV-21FT2K)

A Board, Common Parts

4-203-258-01 *4-374-846-01 4-382-854-01 4-382-854-01
HOLDER, LED COVER, CAPACITOR, CAP TYPE SCREW (M3X8), P, SW (+) SCREW (M3X8), P, SW (+)
CERAMIC CHIP 0.1UF SHORT 0 ELECT 100UF ELECT 22UF CERAMIC CHIP 0.01UF ELECT CERAMIC CERAMIC CERAMIC CERAMIC CHIP CHIP CHIP CHIP 100UF 68PF 68PF 0.33UF 0.001UF
10.00% 25V 20.00% 16V 20.00% 50V 10.00% 50V 20.00% 16V 5.00% 50V 5.00% 50V 25V 10.00% 50V 10.00% 25V 20.00% 50V 10.00% 50V 16V 20.00% 50V 10.00% 50V 10.00% 50V 16V 16V 10.00% 16V 20.00% 50V 25V 20.00% 50V 10.00% 100V 5.00% 50V 10.00% 50V 50V 10.00% 400V 10.00% 50V 20.00% 100V 20.00% 20.00% 10.00% 5.00% 25V 25V 250V 50V 25V

SERVICE MANUAL

COMMANDER DEST CHASSIS NO.

FE-2 CHASSIS

KV-21LT1B KV-21LT1E KV-21LT1K KV-21LT1U

RM-887

French

SCC-Q54C-A

KV-21FT2K

SCC-Q51E-A

Spanish SCC-Q53C-A

SCC-Q51C-A

SCC-Q52C-A

KV-21LT1

RM-889

KV-21FT2

5-2. BLOCK DIAGRAMS (1)

CN1201

R AUDIO
IC001 MICRO, VIDEO PROCESSOR, ROM, AUDIO, VIDEO SWITCH

L AUDIO 2

CN001 TO SPEAKERS
S601 PH601 ISOLATOR VD+ VP
5 IC604 DUAL DC REGULATOR

+3.3V STBY

XTAL IN 63

XTAL OUT 64

J1200 CN601

1 LOWB IN BOOST V- DY3

OUT V DY H- DY+ H- DYH DY V- DYV- DY+ 6 V- DY+

IC501 V OUTPUT

IC002 REMOTE CONTROL RECEIVER

REF H- DYH- DY-

IC201 AUDIO AMP

DY ASSY

+5V STBY

AUD OUT/CV6520 48

1 IN/INL
LINE FILTER T601 RELAY RY601

MAIN RECT D601

OUT/L 14

AUDIO MUTE 5

10 MUTE

TU101 CN603

H- DY+ ICDGC CHECK
LOWB 1 H- DY+ VD 18 VGCH D608 DGC

MUTE SW Q212

DGC CHECK

FB T603 SRT

79 NVM WP

71 SCL

DGC VSENSE D116 +B

D617 EW

IC531 PIN CORRECTION

72 SDA

36 CVBS2/ CVBSY2
+5V STBY 3 RT TIMER +B VG(G) 12

IC603 ERROR AMP

PIN OUT Q532
FUNCTION SWITCH S001 - S006

KEY/CS

J401 (2/2)

HP PROTECT

J401 (1/2)

+5V STBY SS OCP VS 15

D639 RECT AUDIO VCC D619

R DRIVE, BKG Q702, 703

R OUT Q704 TO A BOARD CN504

BLUE IN

53 B2/UIN

IC401 AV LINK A19

RELAY SWITCH Q601 CN504

80 MODE2

G DRIVE, BKG Q705, 706

G OUT Q 707

PICTURE TUBE

GREEN IN

RED D618

52 G2/YIN

RED IN

51 R2/VIN

BLUE VM VCC IK

TO C BOARD CN703

D622 D624 T511 FBT HV

B DRIVE, BKG Q708, 709

B OUT Q710

R G C 2 V

G 4 H V

46 -/C4

50 INSSW2

V IN 1

EWD 17

40 CVBS1 2

QCP DETECT Q612, 602

Y/V IN 2

VD- 18

45 -/CVBS4Y4

TO PICTURE TUBE

TO A BOARD CN502

H2 RCV RV702

VD+ 19

IC003 RESET

65 KEY/CS

C D +B FV

ABL 54

32 AUDIO 1

IC609 STANDBY POWER

TO C BOARD CN706

CN706 TO T511 FBT

H STAT

G2 1000V G2

7 HP D632 RECT IC608

ROT COIL 73

NSC CORRECT

L 3.3V REG

T531 HDT HD STBY +3.3V

29 AUDIO 2

TO C BOARD CN1705 D571, Q571,574

42 CVBS3

STBY 70

CN1801 CN1705

BUFFER Q401,411 H-DRIVE Q535 H-OUT Q533

IC1801

D513 +15V RECT

TO A BOARD CN510

TO ROTATION COIL

TO A BOARD T511 (FBT)

D514 -15V RECT

H1 200V 5 1

TO C BOARD CN707
POWER SUPPLY, DEFLECTION, SMALL SIGNAL BOARD, AUDIO AMPLIFIER

C D E F G

S T U V W

KV-21LT1B

KV-21LT1E

KV-21LT1K

KV-21LT1U

1000uF

JW 5.0mm

2200uF

PLUG, CONNECTOR 3P

PLUG, CONNECTOR 4P

BTF-EF411

BTF-EC401

BTF-EP401

BTF-EU601

H I J K L M N O P Q R S T U V W X