JVC AV-21LTG1 Service Manual

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Page 1

SERVICE MANUAL

COLOUR TELEVISION

V-21LTG1

BASIC CHASSIS

-F

AV-21LTG1

CONTENTS

SPECIFICATIONS

SAFETY PRECAUTIONS

FEATURES

FUNCTIONS

SPECIFIC SERVICE INSTRUCTIONS

SERVICE ADJUSTMENTS

PARTS LIST

★

OPERATING INSTRUCTIONS

★

STANDARD CIRCUIT DIAGRAM

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13 31

2-1

2 3 4 5 6

No. 51892 Nov. 2001

Page 2

V-21LTG1

SPECIFICATIONS

ITEM

Dimensions(W×H×D) Mass

TV RF System

Colour System

VIDEO Mode PAL / SECAM / NTSC3.58 / NTSC4.43

Picture Tube High Voltage

Receiving

Frequency

Intermediate

Frequency

598mm×468mm×471.5mm 24kg

B/G, I, D/K

RF Mode PAL / SECAM

Visibl e size: 51cm measured diagonal ly

26.5kV±1.5kV(at zero beam current)

VHF (VL) 46.25MHz～168.25MHz

VHF (VH) 175.25MHz～463.25MHz

UHF 471.25MHz～863.25MHz

CA TV

VIF Carrier 38.0MHz SIF Carrier

Cable TVs of Mid (X-Z, S1-S10) Super (S11-S20) & Hyper (S21-S41) bands receivable

32.5MHz(5.5MHz), 31.5MHz (6.5MHz), 32.0MHz (6.0MHz), 33.5MHz(4.5MHz)

CONTENT

PAL (4.43MHz),

Colour Sub Carrier Frequency

Power Input Power C onsumption Speaker Audio Output Antenna Terminal

Input terminal

Output terminal

Headphone jack Remote Control Unit

Video 1V(p-p), 75Ω, RCA×2 (Front / Rear)

Audio

Video 1V(p-p), 75Ω, RCA×1

Audio 500mV(rms) (-4dBs), Low impedance, RCA×1

SECAM (4.40625MHz / 4.25MHz) NTSC (3.58MHz)

Rated Voltage AC110～240V, 50 / 60Hz 105W (Max) / 68W(Avg) 5cm×12 cm, Oval ty p e×2 5W (monaural) 75Ω Unbalanced

500mV(rms) (-4dBs), High impe dance ,

3.5mm min i jack RM-C364GY (Battery size : AA / R06 / UM-3×2)

Design and specificat ions ar e s ubjec t to change without notice.

No. 51892

Page 3

SAFETY PRECAUTIONS

V-21LTG1

1. The design of this product contains special hardware, many circuits and components specially for safety purposes. For continued protection, no changes should be made to the original design unless authorized in writing by the manufacturer. Replacement parts must be identical to those used in the original circuits. Service should be performed by qualified personnel only.

2. Alterations of the design or circuitry of the products should not be made. Any design alterations or additions will void the manuf act urer's warr an ty and will further relieve the manufactur er of responsi bility f or person al injury or pr operty dam age res ulting therefrom.

3. Many electrical and mechanical parts in the products have special s afety-relat ed charact eristics. T hese char acteristics are often not evident f rom visual i nspection nor can t he protect ion afford ed by them n ecess arily be obt ained by using rep lacem ent compon ents rated f or higher voltag e, watt ag e, etc. R epl acem ent parts which have these special safety characteristics are identified in the parts list of Service manual.

compon ents hav in g su ch feat ures are id entif ied by s hadin g on the sche matics and by (

The us e of a subst itute replacement which does not

manual.

have the same safety characteristics as the recommended replac ement part shown i n the p arts list of S ervic e manu al may cause shock, fire, or other hazards.

) on the parts list in Service

!!!!

Electrical

Don't short b etween the LIV E side groun d and ISOLATED (NEUTRAL) side ground or EARTH side ground when repairing.

Some model's power circuit is partly different in the GND. The difference of th e GND is show n b y th e LIVE : (") side GND, the ISOLATED(NEUTRAL ) : (#) side GND and EARTH : ($) side GND. Don't short between the LIVE side GND and ISOLATED(NEUTRAL) side GND or EARTH side GND and never meas ure with a measuri ng apparatus (osc illoscope etc .) the LIVE side GND and ISOLATED(NEUTRAL) side GND or EARTH side GND at the same time. If above not e wi ll n ot be kept, a fuse or any parts will be brok en.

5. If any repair has been made to the chassis, it is recommended that the B1 setting should be checked or adjusted (See ADJUSTMENT OF B1 POWER SUPPLY).

6. The hig h voltage app lied t o the picture t ube must c onform wit h that specified in Service manual. Excessive high voltage can cause an increase in X-Ray emission, arcing and possible component damage, therefore operation under excessive high voltag e conditions s hould b e kept to a mi nimum, or sh ould be prevented. If severe arcing occurs, remove the AC power immediately and determine the cause by visual inspection (incorrect installati on, crack ed or melted high voltage harness, poor solderi ng, etc.). To maintain the pr oper minimum le vel of soft X-Ray emission, components in the high voltage circuitry including the picture tube must be the exact replacements or alternatives approved by the manufacturer of the complete product.

7. Do not check high voltage by drawing an arc. Use a high voltage meter or a high voltage probe with a VTVM. Discharge the picture tube before attempting meter connection, by connecting a clip l ead to th e g roun d fr am e and c on necti ng t h e oth er end of the lead through a 10k! 2W resistor t o the an ode button .

8. W hen servic e is requir ed, obser ve the origin al lead dress . Extr a precaut ion shou ld be gi ven to assure c orrect l ead dr ess in t he high voltage circuit area. W here a short circuit has occurred, those comp onents that in dicat e evidenc e of over heating should be replaced. Always use the manufacturer's replacement components.

Isolation Check (Saf ety for El ectrical Shock Hazard)

After re-assembling the product, always perform an isolation check on the exposed metal parts of the cabinet (antenna termin als , vid eo/ au dio inpu t an d out put termin als , C on t r ol kn obs , metal c abinet, s crewhead s, earph one j ack, contr ol shafts, etc.) to be sure the product is safe to operate without danger of electrical shock.

(1)

Dielectric Stren gt h T est

The isol ation b etween th e AC pr imar y circuit and all metal parts expos ed t o th e user, p ar tic u larly any exp osed metal part h aving a return p ath to the chassis should withst and a voltage of 3000V AC (r.m.s .) for a peri od of on e s ec on d .

(. . . . W ithstand a voltag e of 1100 V AC ( r.m.s.) to an applianc e

rated up t o 120V, and 3000V AC (r. m.s.) t o an appl iance rat ed 200V or mor e, f or a peri od of on e s ec on d.) This method of test requires a test equipment not generally found in the service trade.

(2)

Leak age Current Check

Plug the AC lin e c or d dir ec t l y int o t he AC outl et (d o not use a line isolation transformer during this check.). Using a "Leakage Current Tester", measure the leakage current from each exposed metal part of the cabinet, particularly any exposed metal part having a return path to the chassis, to a known good earth ground ( water pipe, etc. ). An y leak age c urr ent mus t not exceed

0.5mA AC (r.m.s.). However, in tropical area, this must not exceed 0.2mA AC (r.m.s.).

Alternate Check Method

""""

Plug the AC lin e c or d dir ec t l y int o t he AC outl et (d o not use a line isolati on transform er during t his check. ). Use an AC voltmet er having 1000 ohms per volt or more sensitivity in the following manner. Connect a 1 500! 10W resistor paralleled by a 0.15"F AC-typ e capacitor betw een an expos ed metal part and a know n good earth ground (water pipe, etc.). Measure the AC voltage across the resistor with the AC voltmeter. Move the resistor connect ion t o each exp os ed met al p art, part icul arl y any exp osed metal part h avin g a return p ath to th e chassis , and meas ure th e AC voltag e across the res istor. N ow, re vers e the plug in the AC outlet and repeat each measurement. Any voltage measured must not exceed 0.75V AC (r.m.s.). This corresponds to 0.5mA AC (r.m.s.). However , i n t ropic al ar ea, t his m us t n ot exceed 0. 3 V A C (r.m.s . ). This corresponds to 0.2mA AC (r.m.s.).

AC VOLTMETER

0.15μF AC-TYPE

1500

GOOD EARTH GROUND

(HAVING 1000 OR MORE SENSITIVITY)

10W

/V,

PLACE THIS PROBE ON EACH EXPOSED METAL PART

No.51892

Page 4

V-21LTG1

FEATURES

New chassis design en ables use of an interact i ve on-s c reen c ontrol.

Wide range voltage (110V～240V) AC p ow er input.

With AUDIO / VIDEO INPUT & OUTPUT terminal.

MUTING button can reduce the audio level to zero instantly.

Functional remote control to operate TV set (for channel select, volume control, power ON/OFF, etc.) from a distance.

C bus control utilizes single chip ICs for IF, V/C, DEF. VSM PRESET, PRESET & TURBO TIMER.

By means of AUTO PROGRAM, the TV stations can be selected automatically and the TV channels can also be rearranged automatically.

Built-in ECO MODE (ECONOMY, ECOLOGY)

In accord ance with th e brightn ess i n a room, the br ightness and / of contr ast of the pic ture can be adjusted au tomaticall y to make t he optimu m pic tu re which is easy on the eye.

Built-in ON TIMER, RETURN + & CHILD LOCK.

SYSTEM BLOCK DIAGRAM

IC702

MEMORY

SCL2/SDA2

IC701

MICRO

COMPUTER

IC301

VIDEO/CHROMA

DECORDER

SCL1/SDA1

TU001

TUNER

No. 51892

Page 5

FUNCTIONS

FRONT PANEL

■

MENU buttons

①

CHANNEL －/＋ buttons

②

(MENU －/＋ buttons)

VOLUME －/＋ buttons

③

(MENU －/＋ buttons)

ECO sensor

④

REMOTE CONTROL sensor

⑤

ON TIMER lamp

⑥

POWER lamp

⑦

MAIN POWER button

⑧

A/V INPUT terminal

⑨

HEADPHONE jack

⑩

V-21LTG1

⑩⑨ ①

REAR TERMINAL

■

②

③

④

⑤⑥

②

①

④

⑤

③

REMOTE CONTROL UNIT(RM-C364GY)

■

⑦

⑧

ANT Terminal

①

VIDEO INPUT Terminal

②

VIDEO OUTPUT Terminal

③

AUDIO INPUT Terminal

④

AUDIO OU T PUT Terminal

⑤

ECO SENSOR key

①

SOUND SYSTEM key

②

COLOUR SYSTEM key

③

TV/VIDEO key

④

OFF TIMER key

⑤

CHANNEL SCAN key

⑥

RETURN＋key

⑦

DISPLAY key

⑧

CHANNEL －/＋ key

⑨

POWER key

⑩

PICTURE MODE key

⑪

NUMBERS (CH.) key

⑫

⑬ －/－－

MUTING key

⑭

MENU key

⑮

MENU ▲/▼ key MENU －/＋ key

VOLUME －/＋ key

⑯

key

No. 51892

Page 6

V-21LTG1

SPECIFIC SERVICE INSTRUCTIONS

DISASSEMBLY PROCEDURE

REMOVING THE REAR COVER

1. Unplug the power plug.

2. As shown in fig ure, remove t he screw mar k ed

3. Withdraw the rear cover toward you.

""""

screws marked

REMOVING THE PW BOARD

After removi ng the rear cover.

1. Slightly raise the bot h sides of t he PW BO ARD by hand and remove the PWB stopper marked

from the FRONT CABINET.

2. Withdraw the PW BOARD backward. (If necessary, t ak e of f the wir e clamp and c onnectors , etc . )

under th e PW BOARD

####

REMOVING THE SPEAKER

After rem ovi ng the rear cover.

1. As shown in figure, remove the

2. Follow the same steps when removing the other hand speaker.

screws marke d

$$$$

!!!!

and a

CHECKING THE PW BOARD

1. To check the back side of the PW Board.

1) Pull out the PW Board. (Refer to REMOVING THE PW Board)

2) Erect the PW B oar d ver t ically so that you can eas il y check the

back side of the PW Board.

[CAUTION]

When erecting the PW Board, be careful so that there will be no

co n tac ting wit h oth e r P W Board.

Before turning on power, make sure that the CRT earth wire and

other conn ec tor are pr op erl y c onnected.

WIRE CLAMPING AND CABLE TYING

1. Be sure to clamp the wire.

2. Never remove the cable tie used for tying the wires together. Should it be inadvertently removed, be sure to tie the wires with a new cable tie.

No. 51892

Page 7

FRONT CABINET

V-21LTG1

SPEAKER

CRT SOCKET PWB

PW BOARDB

SPEAKER

POWER CORD

PWB STOPPER

REAR COVER

No. 51892

Page 8

V-21LTG1

REPLACEMENT OF MEMORY ICs

1. MEMORY ICs

This mod el uses memory ICs. This m em ory IC data ar e f or pr op er oper ation of th e vid eo and defl ec ti on circuits. When replaci n g m emor y ICs , be sure to use ICs writt en with the initi al v alu es of d ata.

2. PROCEDURE FOR REPLACING MEMORY ICs

(1) Power off

Switch th e p ow er off and disc onnect th e power pl ug from the wall outlet.

(2) Replace ICs

Be sure to u se memory ICs written with the initial data values.

(3) Power on

Connect the power plu g into the wall outlet an d s wit c h th e pow er on.

(4) Check and set SYSTEM CONSTANT SET

It must not adjust without adjustment signals.

1) Press the

DISPLAY

CONTROL UNIT simultaneously.

2) T he SER V I CE MEN U scr een of Fig . 1 will be display ed.

3) W hile the S ERVI CE MEN U is dis pl ayed, again press th e

PICTURE MODE

screen of Fi g. 2 will be displa yed.

4) C h eck t h e s et ti ng valu es of th e SYST EM C O NSTAN T S ET of T abl e 1 If th e value is dif ferent, s elect the s etting it em with the

the correct value with the

5) Press the

DISPLAY

(5) R ec eive chann el o f set t in g

Refer to the

OPERATING INSTRUCTIONS

(channels preset) as described

(6) User Setting

Check th e us er s ettin g valu e of T able 2, an d if setti ng val ue is diff erent , s et th e correct val u e. For setting, refer to the

(7) Setting of SERVICE MENU

Verif y the s etting items of th e SE R VIC E MENU of , and reset where nec essary. For setting, refer to the .

KEY ASSIGNMENT OF REMOTE CONTROL UNIT

key and the

PICTURE MODE

key of the REMOTE

DISPLAY

key s imultaneous ly, and th e SYSTEM CONSTAN T SET

▼/▲key, and set

-/+ key.

key twice, and return to the normal screen.

and set the receive channels

OPERATING INSTRUCTIONS

SERVICE ADJUSTMENTS

key an d

SERVICE MENU

1.IF 2.V/C

3.DEF 4.VSM PRESET

5.PRESET

6.TURBO TIMER OFF

1-6 SELECT DISP : EXIT

******

***********

***** **

************

**********

*** ** **

*** ** **** ***

*** ** ***** ** **

**.***

****

** ***

** ***** ***

Fig.1

SYSTEM CONSTANT-

SYSTEM CONSTANT SET 1

COLOUR : TRIPLE BILINGUAL : NO TUNER : MU ECO SENSOR : YES LANGUAGE : E/A/F/R

: SELECT : OPERATE DISP : EXIT

SYSTEM CONSTANT-

SYSTEM CONSTANT SET 2

B/B SOUND : OF F LOCK : 180 COLOUR AUTO : NO QSS : MINT ALC : NO TEXT RATE : 20

:SEL

:OPE DISP:EXIT

***

******

ⅠⅠⅠⅠ

ⅡⅡⅡⅡ

SYSTEM CONSTANT-

PICTURE MODE key

CHANNEL key

DISPLAY ke y

key

-/+

▼/▲

No. 51892

SYSTEM CONSTANT SET 3

AMP TUNER : NO VNR : YES EW-PIN IC : NO

:SEL

:OPE DISP:EXIT

Fig.2

ⅢⅢⅢⅢ

Page 9

SETTING OF SYSTEM CONSTANT SET

Setting item Setting contents Setting value

V-21LTG1

COLOUR

BILINGUAL

TUNER

ECO SENSOR

LANGUAGE

B/B SOUND

LOCK

COLOUR AUTO

QSS

ALC

TEXT RATE

AMP TUNER

VNR

EW-PINIC

MULTI.

YES

YES NO

E/A/F

ON OFF

YES 10 20

YES

MINT

YES NO

10 20 40 80

YES

MQSS

PALTRIPLE

E/F

230 240

～

E/R/A/FE/A

TRIPLE

YES

E/A/F/R

OFF

180

MINT

YES

Table 1

USER SETTING VALUES

Setting item Setting value Setting item Setting value

MAIN POWER OFF PICTURE MODE (VSM) BRIGHT SUB POWER ON LANGUAGE ENGLISH

CHANNEL POSITION 1 POSITION CHANNEL PRESET Refer to OPERATING INSTRUCTION

VOLUME About 10 ECO SENSOR OFF

TV/VIDEO TV VNR OFF

ON SCREEN DISPLAY POSITION INDICATION AUTO SHUTOFF OFF

COLOUR SYSTEM PAL ON TIMER PR1 0:00

SOUND SYSTEM B / G BLUE BACK OFF

OFF TIMER OFF (shown : 00 ) CHILD LOCK OFF

Table 2

No. 51892

Page 10

V-21LTG1

INITIAL SETTING VALUE OF SERVICE MENU

1. Adjustment of the SERVICE MENU is made on the basis of the initial setting values ; however, the new setting values which set the screen in its optimum condition may differ from the initial setting.

2. Do not change the initial Setting Values of the Setting (Adjustment) items not listed In “ADJUSTMENT”.

2. V/C

Setting item

2. DRIVE

3. BRIGHT

4. CONT.

5. COLOUR

6. TINT

7. SECAM BL ADJ.

8. SHARP

(Do Not Adj.)

3. DEFLECTION

Setting item Variable range

1. VER. POSITI ON

2. HOR. POSITION

Colour system

RED GREEN1. CUT OFF BLUE RED BLUE

TV VIDEO

Variable

range

-128～+127

-127～+127

-63～+63

-31～+31

-32～+31

-04 ～ +03 - 1 - 3

-16 ～ +15 +3 + 3

PAL SECAM NTSC 3.58 NTSC 4.43

-50

+ 0

+ 0 + 0 + 0

+ 0

- 5(Fixed) +15(Fixed)

fv : 50Hz MODE fv : 60Hz MODE

Initial settin g val ue

+ 0 + 0 + 8 + 0

Initial settin g val ue

3. VER. HEIGHT

4. VER. LINEARITY

5. VER. SCURVE

6. HOR. VCO ADJUST

4. VSM PRESET

VSM preset

VSM mode

Setting item

SETTING VALUE +15

TINT COLOUR BRIGHT CONT. SHARP

SETTING VALUE

-64 ～ +63 -35 + 1

-32 ～ +31 +15 - 1

-32 ～ +31 -32 + 0

-63 ～ +62 + 0 + 0

BRIGHT STANDARD SOFT

+15 +15 +30 +15 +11 +15 +12

No. 51892

Page 11

5. PRESET

The items in the following table, it is no requirement for adjustment. If values had changed by the miss operation, set the initial setting values in the following table.

Colour System (Do Not Adj u st )

Setting item

1. C TRAP FIX

2. SHARP PEAK

PAL SEC AM NTSC 3.58 NTSC 4.43

111 1 000 0

Initial setting value (Fixed value)

V-21LTG1

3. ABL

4. GAMMA

5. Y. DELAY TIME

6. BLACK EXP START

7. C-BPF

8. CW / SCP

9. VIF DET LEVEL

11. IF AGC MIN

12. VIF AGC

13. VIF PMOD

19. VNR

20. RGB LIM

21. RGB LIMIT LEVEL

23. TEXT H. POSITION

VIDEO

111 1 000 0 022 3 020 2 333 3 110 0 111 1

＋

000 0 000 0 000 0 000 0

15 15 15 15

111 1 222 2

-3 -3 -3 -3

＋

24. READ DATA

Sound System (Do Not Adjust)

Setting item B/G I D/K M

10. SIF DET LEVEL

14. SIF BPF BW ADJUST

15. SIF TRA P FO ADJUST

16. SIF TRA P FO ADJUST 2

17. SIF -TRAP

18. SIF -BPF

22. SIF SW

＋

000 0 000 1 111 0

No. 51892

＋

Page 12

V-21LTG1

REPLACEMENT OF IC301 (IF V/C DECODER)

For the IC3 01(IF V/C DEC ODER) of this model , all data ar e written in t he micro-c omputer . So, write t he data in the micro-

comput er i n ac cor d ance with the follo wi ng pr oc edures b efore start in g adj u stment.

RE PLACING PR OCE D URES

Turn the POWER OFF.

(1)

Replace the IC301 with a new one.

(2)

While pr essi ng MENU but t on and VO L+ bu tt on O N t he FR ONT CAB INET s imu lt aneous l y, tur n the POWER ON. When th e POW ER is

(3)

turned ON, the data is written in the micro-computer immediately.

LOCATIONS OF FRONT PANEL BUTTONS AND LAMPS

MENU buttons

①

①② ③ ④⑤⑥⑦ ⑧

CHANNEL

②

(MENU

VOLUME

③

(MENU

ECO sensor

④

REMOTE CONTROL sensor

⑤

ON TIMER lamp

⑥

POWER lamp

⑦

MAIN POWER button

⑧

－－－－/＋＋＋＋

buttons)

－－－－/＋＋＋＋

buttons)

buttons

No. 51892

Page 13

SERVICE ADJUSTMENT

BEFORE STARTING SERVICE ADJUSTMENT

1. There are 2 way of adjusting this TV: One is with the REMOTE CONTRO L UNIT and t he oth er is t he conv ention al method using adjustm ent pa rts and components.

2. T he adju stment with t he REM OTE C ONTR OL UNIT is m ade on the basis of the initial setting values. The setting values which adjust the scree n to its o ptimum c on d ition may di ff er from the initial setting values.

3. Make sure that connection is correctly made to AC power source.

4. T urn on the power of th e set and equipment bef ore use, and start the adjustment procedures after waiting at least 30 minutes.

5. Unl ess other wis e specifi ed, prep are the mos t suitab le rec eption or input signal for adjustment.

Never touch a ny adjustment par ts, which are not specified in the list for thi s a djust men t VR s, tr an sfor ms, cond en ser s, etc.

7. Preparation for adjustment Unless oth erwis e sp ec ified in t h e adj us t m en t i ns tr uc t ions, preset the following functions with the REMOTE CONTROL UNIT.

User menu pres et value

PICTURE MODE (VSM) BRIGHT VNR OFF

TINT / COLOUR / BRIGHT / SHARP / CONT.

BLUE BACK OFF OFF TIMER OFF ECO SENSOR OFF AUTO SHUT OFF OFF

V-21LTG1

MENU ITEM PRESET VALUE

CENTER

MEASURING INSTRUMENT AND FIXTURES

1. DC voltmeter (o r digital voltm eter)

2. Oscilloscope

3. Signal generator (Pat tern generator) [PAL / SECAM / NTSC]

4. Remote control unit

ADJUSTMENT ITEMS

Adjustment item

B1 POWER SUPPLY

FOCUS adj us tment

IF circuit adjustment

V/C (Video / Chroma) circuit adjustment

DEFLECTION circuit adjustment

VSM PRESET setting

PURITY, CONVERGENCE adjustment

No. 51892

Page 14

V-21LTG1

BASIC OPERATION OF SERVICE MENU

The adjustment using SERVICE MENU

The followi ng adjustm ent items us e the SERVICE ME NU in the seri es of the adjust ment. The adjus tments are made on the basis of the initial setting values. The adjustment values which adjust the screen to the optimum condition can be different from the initial setting values. With the SERVICE MENU, various settings can be made, and they are broadly classified in the following items of settings.

1.IF

･･･････････････････････

2.V/C

･･････････････････････

3.DEF

･････････････････････

4.VSM PRESET

5.PRESET

6.TURBO TIMER

Key operation of the SERVICE MENU

････････････

･････････････････

････････････

[Enter to SERVICE MENU]

Press the

DISPLAY

key and th e

UNIT simultaneously. Then enter the SERVICE MENU mode as shown in Fig.1.

Adjustment of the IF circuits. Adjustment of the VIDEO/CHROMA circuit. Adjustment of the DEFLECTION circuit. Adjustm en t of th e initial s ettin g val ues of VSM c on d it i on as STANDAR D , SO FT and BRIGH T. (VSM : Video Status Memory) Adjustmen t of the RF circuit

[Do not adjust]

For quick s et ti ng t h e TI MER c ou nt value, ad jus t able not onl y b y mi nuets but also by second.

[Should be OFF]

PICTURE M ODE

key of the REMOTE CONTROL

[Exit from SERVICE MENU]

When complete the adjustment work, press the

DISPLAY

key to return to the SERVICE MENU. And then press the

DISPLAY

key again, return to the normal screen.

[Select from SERVICE MENU]

In SERVICE MENU , press the number (1～6) key of the remote control unit, to select any of the adj ustmen t it ems .

The colours which selected item characters are changed.

KEY ASSIGNMENT OF REMOTE CONTROL UNIT

SERVICE MENU

1.IF 2.V/C

3.DEF 4.VSM PRESET

5.PRESET

6.TURBO TIMER OFF 1-6 SELECT DISP : EXIT

******

***********

***** **

************

**********

*** ** **

*** ** **** ***

*** ** ***** ** **

**.***

****

** ***

** ***** ***

***

******

Fig.1

PICTURE

MODE key

CHANNEL

key

▼/▲

key

DISPLAY ke y

No. 51892

－/＋

key

Page 15

[Method of setting]

1. IF

[1. VCO]

1 key

① ② ③ ④

[2. DELAY POINT]

① ② ③ ④

･････････････････････････

1 key

･････････････････････････

The VCO (CW) screen w il l be dis played a allow mark wh en the AF C vol t age is at a certai n l evel. DISPLAY key

1 key

･････････････････････････

2 key

･････････････････････････

MENU -/+ key

DISPLAY key

･･････････････････

････････････････

･･････････････････

Selec t Selec t

As you press this key twice, you will return to the

Selec t Selec t Set (adjust) the setting values of the setting items. When this is pre ssed twice, you will return to the

1.IF

1.VCO

1.IF

2.DELAY POINT

SERV ICE MEN U

SERVICE MENU

V-21LTG1

2.V/C, 3.DEF

2~4 key

①

MENU ▼/▲ key

②

MENU -/+ key

③

DISPLAY key

④

6.TURBO TIMER

By pressing the 6 key, you can change the ON or OFF (

①

and

4.VSM PRESET

･･･････････････････････

･･･････････････

････････････････

･･････････････････

Select on e from Select setting items. Adjust the values of the items. When this is pressed , return to the

If it is ON, the timer in TIMER mode changes from 1 minute into 1 sec temporarily. (It is easier to checks the Operation of TIMER) If you turn the TV power off, this setting becomes OFF automatically.

2. V/C, 3. DEF

should be O FF

and

4. VSM PRESET

SERV ICE MEN U

No. 51892

Page 16

V-21LTG1

SERVICE MENU FLOW CHART

SERVICE MENU

1.IF 2.V/C

3.DEF 4.VSM PRESET

5.PRESET

6.TURBO TIMER OFF

1-6 SELECT DISP : EXIT

******

***********

***** **

************

**********

*** ** **

*** ** **** ***

*** ** ***** ** **

6.TURBO TIMER

** ***

** ***** ***

OFF

ON /

**.***

***

****

******

OFF

(By pressing 6-key)

SUB MENU 1. IF

1. VCO

2. DELAY POINT

1-2 : SELECT DISP : EXIT

SUB MENU 2. V/C

V/C PAL

1. CUTOFF

50Hz

/ :SELECT

- / + : OPERATE DISP : EXIT

(R) (G) (B)

* **

VCO (CW)

TOO HIGH ABOVE REFERENCE JUST REFERENCE BELOW REFE RENCE TOO LOW AFT ADJUST VCO ADJUST FINE

DELAY POINT UHF

AGC TAKE-OVE R

- / + : OPERATE DISP : EXIT

***.**

MHz

***(**)

***(**)***(**) ***(**)

***(**)

***(**)***(**)

DISP : EXIT

SUB MENU 3. DEF

DEF

1. VER. POSITION

50Hz

/ :SELECT

- / + : OPERATE DISP : EXIT

PAL

***

SUB MENU 4. VSM PRESET

BRIGHT

TINT COLOUR BRIGHT CONT. SHARP

/ :SELECT

- / + : OPERATE DISP : EXIT

** ** ** ** **

SUB MENU 5. PRESET

PRESET

1. C-TRAP FIX

50Hz

/ :SELECT

- / + : OPERATE DISP : EXIT

PAL

No. 51892

B/G

***

Page 17

ADJUSTMENT LOCATIONS

TOP

CRT SOCKET PWB

TP-47R/G

V-21LTG1

(SOLDER SIDE)

FRONT

TP-47G/R

MAIN PWB

F901

TP-47B

TP-E

IC701

IC702 MEMORY IC

CRT EARTH WIRE

(BRAIDED ASS'Y)

DEG

TU001

IC301

No. 51892

1Pin TP-91(B1) 2Pin NC 3Pin X-ray1 4Pin X-ray2 5Pin TP-E( )

HVT

UPPER:FOCUS LOWER:SCREEN

Page 18

V-21LTG1

ADJUSTMENTS

B1 POWER SUPPLY

Item

Check of B1 Power

Measuring

instrument

Signal generator

Supply

DC Vol t meter

FOCUS ADJUSTMENT

Item

Adjustment of FOCUS

Measuring

instrument

Signal generator

IF CIRCUIT ADJUSTMENT

Item

Measuring

instrument

Test point Adjustment part Description

TP-91 (B1) TP-E (

####

)

1. Inp ut a w h ol e blac k sig n al.

2. Connect a DC voltmeter to TP-91(B1) and TP-E (#).

3. Make sure that the voltage is DC114.5±1.5V.

Test point Adjustment part Description

FOCUS VR [In HVT]

1. Input a cross-hatch signal.

2. While watc hing t he scr een, ad just t he FOCU S VR t o mak e the vertic al and hor i z ontal lines as fi n e and s h arp as poss i ble.

3. Make sure that when the screen is darkened, the lines remain in good focus.

Test point Adjustment part Description

Adjustment of VCO(CW)

Signal generator

Remote control unit

VCO (CW)

TOO HIGH ABOVE REFERENCE JUST REFERENCE BELOW REFE RENCE TOO LOW AFT ADJUST VCO ADJUST FINE

DISP : EXIT

ADJUSTMENT AT THIS POINT IS USELESS

***.**

MHz

***(**)

***(**)***(**)

***(**)

***(**)***(**)

ADJUSTMENT POINT

1. VCO

YELLOW

Do not adjust

TOO HIGH

ABOVE REFERENCE

JUST REFERENCE

BELOW REFERENCE

TOO LOW

Please use signal generator which is correct proof about the

●

sending frequency.

1. Input the PAL full colour bar (210.25MHz) signal.

2. Select 1.IF from the

3. Pr ess 1 key and select

4. Select

5. Press

VCO ADJUST

SERV ICE MEN U

1.VCO

with

-/+ key until the colour of the characters TOO

HIGH ch anges blu e to yel low. Th en gr ad uall y pr ess t he

▲/▼ key.

-/+ key until the TOO LOW changes yellow. At this time, confirm th a t the v a lu e of

6. Select

7. Press

AFT A D JUST

VCO ADJUST

with

-/+ key until the char acters JUST REFERENCE

is near +00.

▲/▼ key.

changes blue to yellow.

8. Press the

DISPLAY

key three times to return to normal scree n .

No. 51892

Page 19

V-21LTG1

Item

Adjustment of DELAY POINT (AGC)

Measuring

instrument

Signal generator

Remote control unit

Test point Adjustment part Description

DELAY POINT

(AGC TAKE-OVER)

1. Inp ut a bl ac k an d w hit e si gnal (c olour of f ) .

2. Select

3. Select

from the SERVICE MENU.

1. IF

2. DELAY POINT

control un it.

4. Set the s etti ng v alues wi th of the set ti ng items as s h ow n b ellow table.

5. Adjust th e MEN U - or + key u nt il vi d eo noise dis appears.

6. Turn to other channels and make sure that there are no irregularities.

DELAY POINT UHF

AGC TAKE-OVER

- / + : OPERATE DISP : E XIT

by pres sing t he 2 key on the remote

Setting Item Variable range Initial setting value

DELAY POINT

(AGC TAKE OVER)

NTSC 3 . 58 OTHER

0～127

No. 51892

Page 20

V-21LTG1

VIDEO / CHROMA CIRCUIT ADJUSTMENT

The setting (adjustment) using the REMOTE CONTROL UNIT is made on the basis of the initial setting values. The setting values which adjust the screen to the optimum condition can be different from the initial setting values. Do not change the initial setting values of the setting items not listed in “ADJUSTMENT”.

Item

Adjustment of WHITE BALANCE (Low light)

Measuring

instrument

Signal generator

Remote control unit

Test point Adjustment part Description

V/C PAL

1. CUTOFF

50Hz

/ :SELECT

- / + : OPERATE DISP : EXIT

KEY ASSIGNMENT OF REMOTE CONTROL UNIT

CUTOFF OFF

(H.LINE OFF)

CUTOFF ON

(H.LINE ON)

R. CUTOFF( )

▲

R. DRIVE( )

▲

▼

R. DRIVE( )

▼

123

1. CUT OFF (R) CUT OFF (G) CUT OFF (B)

SCREEN VR [IN HVT]

(R)

* **

(G)

* **

(B)

* **

G.CUTOFF( ) B. CUTOFF( ) B. DRIVE( )

B. CUTOFF( ) B. DRIVE( ) G.CUTOFF( )

1. Inp ut a bl ac k an d w hit e si gnal (c olour of f ) .

2. Select (R), (G) and (B) .

OFF

from the SERVICE MENU, then select

2. V/C

1. CUT

3. Set each value to initial setting value with 4～9 keys of the

remote control unit.

4. Press t he

key of the rem ote contr ol unit to show the singl e

horizontal line on screen.

5. Turn the

SCREEN VR

fully coun te r- clockwi se , the n s lo wly tu r n i t clockwis e to where one of a red, blu e or green colour is f aintly visible.

6. Use keys

of the remote contr ol u nit an d ad jus t the oth er 2

4～9

colours which except t he appeared c olour to wh ere the singl e horizontal line appears white.

7. Turn the

SCREEN VR

to where the single horizontal line glows

faintly.

8. Press the

9. Press the

▲

1. CUT OFF

key to turn off th e si ngl e h or iz on tal line.

DISPLAY

Adjustment item

key twice to return to the normal screen.

Variable

range

-128～+127

Initial settin g

value

-50

Adjustment of WHITE BALANCE (High light)

Signal generator

Remote control unit

2. DRIVE (R DRIVE (B)

)

1. Input a black an d w hit e signal (colour off).

2. Select

3. Select

from the SERVICE MENU.

2. V/C

2. DRIVE (R) / (B)

with M ENU ▼/▲ key, and set each value to ini tial s et ting valu e wit h 4 and 7 or 6 and 9 k eys of the remote control unit.

4. Use the keys

and 7 or 6 and 9 to produc e a wh it e sc reen

5. Press the D ISPLAY key twice to return to the nomal screen.

V/C PAL

2. DRIVE

50Hz

/ :SELECT

- / + : OPERATE DISP : EXIT

(R) (B)

* ** * **

No. 51892

Adjustment item

2. DRIVE

Variable

range

-128～+127

Initial settin g

value

+0 +0

Page 21

V-21LTG1

Item

Adjustment of SUB BRIGHT

Adjustment of SUB CONT.

Adjustment of SUB COLOUR

ⅠⅠⅠⅠ

Measuring

instrument

Remote control unit

Test point Adjustment part Description

3. BRIGHT

4. CONT.

5. COLOUR [Method of adjustment without measuring instrument]

PAL COLOUR

1. Receive an y br oad cast.

2. Select

3. Select

4. Set the initial setting value with the MENU -or+ key.

5. If the brigh tness is n ot the best w ith the initi al set valu e, mak e fine adjus t m ent un til you get the bes t brightn ess .

1. Receive an y br oad cast.

2. Select

3. Select

4. Set the initial setting value with the MENU -or+ key.

5. If the contrast is not the best with the initial set value, make fine adjust m ent un t il you get t h e bes t c ontrast.

1. Receive a PAL broadcast.

2. Select

3. Select

4. Set the initial setting value for PAL COLOUR with the MENU

-or+ key.

5. If the colour is not the best with the initial set valu e, make fine

adjust m ent un t il you get t h e bes t c ol our .

from SERVICE MENU.

2. V/C

3. BR I GHT

2. V/C

4. CONT

2. V/C

5. COLOUR

with the MENU ▼/▲key.

from SERVICE MENU.

. with the MENU ▼/▲key.

from the SERVICE MENU.

with the MENU ▼/▲ key.

SECAM COLOUR

NTSC 3.58 COLOUR

NTSC 4.43 COLOUR

No. 51892

1. Receive a SEC A M broadcas t .

2. M ak e fine adjust m en t of S EC AM COLOUR as previ ous l y.

1. Receive a NT S C 3.58 MHz broadcast.

2. Make similar fine adjustment of NTSC 3.58 COLOUR as previously.

When NTSC 3.58 adjustment completed, NTSC 4.43 will be automatically set at the respective values.

Page 22

V-21LTG1

Item

Adjustment of SUB COLOUR

ⅡⅡⅡⅡ

Measuring

instrument

Signal generator

Oscilloscope

Remote control unit

Test point Adjustment part Description

TP-47G/R

TP-E (

####

[CRT SOCKET PWB]

5. COLOUR [Method of adjustment using measuring instrument]

)

(A)

PAL COLOUR

(－)

(＋)

1. Input a PAL full field colour bar signal (75% white).

2. Select

3. Select

4. Set the initi al s ett i ng val ue of PAL COLOU R with the ME NU

- or + key.

5. Connect the oscilloscope between TP-47G/R and TP-E (#).

6. Adjust PAL C OLOUR t o bring the val u e of to +9V(W-G). (Voltage value b etween (W) and (G))

from SERVICE MENU.

2. V/C

5. COLOUR

with the MENU ▼/▲ key.

SECAM COLOUR

1. Input a SECAM full field colour bar signal (75% white).

2. S et the initi al s etti ng val u e of SECAM CO LOUR with the MENU

- or + key.

3. Adjust SECAM COLOUR to bring the value of illustr ation to +6V(W-G ). (V oltage value between (W) and (G))

in the illustration

(A)

in the

NTSC 3.58 COLOUR

NTSC 4.43 COLOUR

1. Input a NTSC 3.58 full field colour bar signal (75% white).

2. Set the initial setting value of NTSC 3.58 COLOUR with the MENU - or + key.

3. Adjust NTSC 3 .58 COLOUR to bring the value of illustr ation to +8V(W-G ). (V oltage value between (W) and (G))

When NTSC 3.58 is set, NTSC 4.43 will be automatically set at the respective val u es .

No. 51892

(A)

in the

Page 23

V-21LTG1

Item

Adjustment of TINT

ⅠⅠⅠⅠ

Adjustment of TINT

ⅡⅡⅡⅡ

Measuring

instrument

Signal generator

Remote control unit

Signal generator

Oscilloscope

Remote control unit

Test point Adjustment part Description

6. TINT [Method of adjustment without measuring instrument]

1. Input a NTSC 3.58 full field colour bar signal (75% white).

2. Select

3. Select

4. S et the init ial s ett ing valu e of NT SC 3.58 with th e MENU - or + key.

5. If you cannot g et the b est tint wi t h th e init i al s ett in g val u e, m ak e fine adjustment until you get the best tint.

When NTSC 3.58 is set, NTSC 4.43 will be automatically set at the respective val u es .

1. Input a NTSC 3.58 full field colour bar signal (75% white).

2. Select

3. Select

4. S et the init ial s ett ing valu e of NT SC 3.58 with th e MENU - or + key.

5. Connect th e osc i ll oscope bet w een TP -4 7G /R an d TP -E (#).

6. Adjust NTSC 3.58 TINT to bring the value of illustr ation to +7V(W- Cy)

(Voltage difference between (W) and (Cy))

from SERVICE MENU.

2. V/C

with the MENU ▼/▲ key.

6. TINT

from SERVICE MENU.

2. V/C

with the MENU ▼/▲ key.

6. TINT

TP-47G/R TP-E (

####

[CRT SOCKET PWB]

NTSC 3.58 TINT

NTSC 4.43 TINT

6. TINT [Method of adjustment using measuring instrument]

)

NTSC 3.58 TINT

(B)

in the

(－)

(B)

(＋)

NTSC 4.43 TINT

When NTSC 3.58 is set, NTSC 4.43 will be automatically set at the respective val u es .

No. 51892

Page 24

V-21LTG1

Item

of SECAM BLACK OFFSET

KEY ASSIGNMENT OF REMOTE CONTROL UNIT

Measuring

instrument

Remote control unit

Signal generator

Test point Adjustment part Description

COLOUR

123

COLOUR

OFF

7.SECAM BL ADJUS T

[Method of adjustment using measuring instrument]Adjustment

1. Input a SECAM full field colour bar signal.

2. Select

3. Select

4. Set the initial setting value with the - or + MENU key.

5. Switch the 1 key (col our OFF) and 2 key (c olour ON) on the remote c ontrol and make sure that there is no colour on t he black an d white scr een.

6. If the black and w hite screen is not best with t he initial s etting value, make fine adjustm ent until you get th e best blac k and white screen.

7. While watching the screen, adjust the value to be the same colour between O N & OF F by T en key on the r emote c ontrol unit.

8. Press t h e DISPLAY key twice to return to the normal screen.

from SERVICE MENU.

2. V/C

7. SE CAM BL A D JUST

with ▼/▲MENU key.

No. 51892

Page 25

DEFLECTION CIRCUIT ADJUST MENT

There are 2 modes of adjustment (setting value) ------ ① 50Hz mode and ② 60Hz mode ----- depending upon the kind of signals

(vertical frequency 50Hz / 60Hz).

W hen adjus t ed in mode ① , mode ② will be automatically set.

V-21LTG1

Item

Adjustment of

V.HEIGHT

####

& V.POSITION

Screen

size

92%

Measuring

instrument

Test point Adjustment part Description

Signal generator

Remote control unit

SUB MENU 3. DEF

DEF

1. VER. POSIT I ON

50Hz

/ :SELECT

- / + : OPERATE DISP : EXIT

Screen size

PAL

***

1. VER. POSITION

3. VER. HEIGHT

Picture size 100%

1. Input a cross-hatch si gnal.

2. Select

3. Select

from SERVICE MENU.

3. DEF.

3. VER. HEIGHT

with the MENU ▼/▲ key.

4. Set the initial setting value with the MENU -/ +key.

5. As s hown in Fig. 1, adjus t the 3. vertic al scr een si ze t o

of the pictur e siz e with the MEN U

92%

VER. HEIGHT

and make t he

-/ + key s of remote control unit.

6. Inp ut a circ l e p at t ern signal.

7. Select

1. VER. POSITION

with the MENU ▼/▲ key.

8. Set the initial setting value with the MENU -/ + key.

9. Adjust

1. VER. POSITION

to make V=V’ with the MENU -/ +key

as shown in the Fig.2.

Adjustment

HOR.

####

POSITION

Picture size 100%

Signal

2.HOR. POSITION

generator

Remote control unit

HH'

Fig.2

No. 51892

10. Inp ut a cir c l e p attern sign al .

11. Select

2. HOR POSITION

with the MENU ▼/▲ key.

12. Set the initial setting value of

MENU -/ +key.

13. Adjust

2. HOR. POSITION

to mak e H=H’ as sh own in Fig.2

with the MENU -/ + key.

2. HOR. POSITION

with the

Page 26

V-21LTG1

Item

Adjustment of VER. LIN. & VER. SCURVE

Measuring

instrument

Signal generator

Remote control unit

Fig.3

Test point Adjustment part Description

W hen the ver tical linear ity has been deterior ated remar kably,

4. VER. LIN.

5. VER. SCURVE

●

perform the following steps.

14. Input a cross-hatc h signal.

15. Select

4. VER. LIN.

16. Set the initial setting value of

with the MENU ▼/▲ key.

4. VER LIN.

key.

TOP

17. Select

5. VER. SCURVE

18. Set the initial setting value of

with the MENU ▼/▲ key.

MENU - / + key.

CENTER

19. Adjust

4. VER. L I N.

of each line as shown in Fig.3 on TOP, CENTER and

and

5. VER. SCURVE

BOTTOM become uniform.

BOTTOM

with the MENU - / +

5. VER. SCURVE

so that the spaces

with the

Make sur e th at the adjust ment is prop erly d one on the sc reen of 60Hz mode. [NOTE]

Adjust t o m ake bot h 50H z & 60Hz ar e th e same v. si ze and

fine straight line.

When adjus t ag ai n, adjus t 50Hz mode firs t.

When adjus t in 60 Hz m ode, only 60H z m ode is adjust.

No. 51892

Page 27

VSM PRESET SETTING

V-21LTG1

Item

Setting of VSM PRESET

Measuring

instrument

Remote control unit

TINT COLOUR BRIGHT CONT. SHARP

/ :SELECT

- / + : OPERATE DISP : EXIT

Test point Adjustment part Description

BRIGHT

** ** ** ** **

TINT COLOUR BRIGHT CONT. SHARP

1. Select

2. Select BRIGHT with the PICTURE MODE key.

3. Adjust the MENU ▼/▲ and MENU - or + k ey to bri ng the s et

4. Respectively select the VSM PRESET mode for SOFT and

4. VSM PRESET

values of TINT ～ SHARP to the values shown in the table given before page.

STANDARD, and make similar adjustment as in 3 above.

from the SERVICE MENU.

VSM PRESET

$$$$

VSM Setting Item

TINT +15 COLOUR +15 BRIGHT +15

CONT +30 +15 +11 SHARP +15

BRIGHT STANDARD SOFT

← ←← ←←

←

+12

No. 51892

Page 28

V-21LTG1

PURITY / CONVERGENCE ADJUSTMENT

PURITY ADJ USTMENT

1. Demagnet ize CRT with the demagnetizer.

2. Loosen the retainer screw of the deflection yoke.

3. Remove the w ed ges.

4. Input a green r aster signal f rom the sign al gener ator, an d turn the screen to green raster.

5. M ove t h e def l ec tion yoke bac k w ard.

6. Brin g the long l ug of the pur ity magnets on the sh ort lug an d position them horizontally. (Fig.2)

7. Adj us t t h e g ap b etween two lugs s o th at th e G R EEN RASTER will come into the center of the screen. (Fig.3)

8. Move the defl ection yok e forward, and fix the position of the deflection yoke so that the whole screen will become green.

9. Insert the wedge to the top side of the deflection yoke so that it will not move.

CRT

WEDGE

DEFLECTION YOKE

P : PURITY MAGNET 4 : 4 POLES 6 : 6 POLES

Fig.1

PURITY MAGNETS

PURITY MAGNET(P)

P / C MAGNETS

CRT SOCKET PWB

P/C M A GNETS

(con ver g ence magn ets ) (con ver g ence magn ets )

10. Input a crosshatch signa l.

11. Verify that the sc reen is hori z ont al.

12. Inp ut red and blu e raster si gnals, and make su re that pur ity is properly adjusted.

Short lug

Long lug

Bri n g th e l on g l u g over t h e s h or t lug and position them horizontally.

Fig.2

(FRONT VIEW)

CENTER

Fig.3

GREEN RASTER

No. 51892

Page 29

STATIC CONVERGENCE ADJUSTMENT

1. Input a crosshatch signal.

2. Using 4- pole conver gence magn ets, overlap th e red and bl ue lines in the center of the screen (Fig.1) and turn them to magenta (red/blue).

3. Using 6-pole convergence magnets, overlap the magenta (red/bl ue) and gr een li nes in th e cent er of th e screen and tur n them to white.

4. R epeat 2 and 3 above, an d m ak e b est c on vergence.

After adj us tm ent, fix th e wed g e at th e ori gi n al p osi t i on. Fasten the retainer screw of the deflection yoke. Fix the 6 magn et s wit h glu e.

V-21LTG1

(FRONT VIEW)

Fig.1

DYNAMIC (periphery) CONVERGENCE ADJUSTMENT

After adjusting purity & static convergence.

1. Move t he defl ecti on yok e up an d d own an d overl ap the l ines in the periphery. (Fig.2)

2. Move the deflection yoke left to right and overlap the lines in the periphery. (Fig.3)

3. R epeat the steps 1 an d 2 and obt ain an optim u m c on verg ence.

After adj us tm ent, fix th e wed g e at th e ori gi n al p osi t i on. Fasten the retainer screw of the deflection yoke. Fix the 6 magn et s wit h glu e.

(FRONT VIEW)

BLUE

GREEN

RED

(FRONT VIEW)

GREEN

RED

BLUE

RED

BLUE

GREEN

Fig.2

BLUE

RED

BLUE

GREEN

RED

GREEN

BLUE

RED

RED GREEN BLUE

BLUE GREEN RED

Fig.3

No. 51892

Page 30

V-21LTG1



REPLACEMENT OF CHIP COMPONENT

CAUTIONS

1. Avoid heating for more than 3 seconds.

2. Do not rub the electrodes and the resist parts of the pattern.

3. When removing a chip part, melt the solder adequately.

4. Do not r euse a chip part aft er rem oving it.

SOLDERING IRON

1. Use a high ins ul at i on s old er in g iron with a thin pointed end of it.

2. A 30w soldering iron is recommended for easily removing parts.

REPLACEMEN T STEPS

How to remove Chip parts

1. Resistors, capa citors, etc.

(1) As sh own in th e figure, pus h the p art with t weezers and

alternately melt th e s old er at eac h en d.

2. How to install Chip parts

Resistors, capa citors, etc.

(1) Apply solder to the pattern as indicated in the figure.

(2) S hif t with tweezers and remo ve th e ch ip p ar t.

Transistors, diodes, variable resistors, etc.

(1) Apply extra solder to each lead.

SOLDER

(2) As sh own in th e figure, pus h the p art with t weezers and

alternat ely melt th e solder at each l ead. Shift and remov e the chip part.

SOLDER

(2) Grasp the chip part with tweezers and place it on the

solder. Then h eat and m elt the sold er at both en ds of the chip part.

Transistors, diodes, variable resistors, etc.

(1) Apply solder to the pattern as indicated in the figure. (2) Grasp the chip part with tweezers and place it on the

solder.

(3) First solder lead

(4) Then solder leads

as indicated in the figure.

and C.

Note : Afte r rem oving t he part, rem ove rema ining s older from

the pa ttern.

No. 51892

Page 31

VICTOR COMPANY OF JAPAN, LIMITED

HOME AV NETWORK BUSINESS UNIT 12, 3-chome, Moriya-cho, Kanagawa-ku, Yokohama, Kanagawa-prefecture, 221-8528, Japan

AV21LTG1-H #4

VP 0111 DP7051