JVC AV-2124EE, AV-21ETG2 Service Manual

A
A
SER VICE MANUAL
COLOUR TELEVISION
V-21ETG2
V-2124EE
BASIC CHASSIS
AV-21ETG2 AV-2124EE
!!
CG
CONTENTS
SPECIFICATIONS
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SAFETY PRECAUTIONS
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FEATURES
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FUNCTIONS
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MAIN DIFFERENCE LIST
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SPECIFIC SERVICE INSTRUCTIONS
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SERVICE ADJUSTMENTS
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PARTS LIST
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OPERATING INSTRUCTIONS
STANDARD CIRCUIT DIAGRAM
1
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14 33
2-1
2 3 4 5 6 7
No. 51893
Dec. 2001
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V-21ETG2
A
V-2124EE

SPECIFICATIONS

ITEM
Dimensions(W×H×D) Mass
TV RF System
Colour System
Picture Tube High Voltage
Receiving Frequency
Intermediate Frequency
Colour Sub Carrier Frequency
RF Mode PAL / SECAM VIDEO Mode PAL / SECAM / NTSC3.58 / NTSC4.43
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
CONTENT
AV-21ETG2 AV-2124EE
497mm×454mm×478.5mm 21kg
B/G, I, D/K, K1
Visible size: 51cm measured diagon ally
26.5kV±1.5kV(at zero beam cur rent )
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) PAL (4.43MHz),
SECAM (4.40625MHz / 4.25MHz) NTSC (3.58MHz / 4.43MHz)
Power Input Power Consumption
Speaker Audio Output Aerial Input Terminal Input
Output
Headphone jack Remote Control Unit
Rated Voltage AC110~240V, 50 / 60Hz AC220~240V, 50 / 60Hz
90W (Max) / 60W(Avg) 5cm×9cm, Oval type×1 3W (monaural) 75Ω Unbalanced
Video 1V(p-p), 75Ω (Front / Rear)
Audio
Video 1V(p-p), 75 Audio 500mV(rms) (-4dBs), Low impedance,
500mV(rms) (-4dBs), High impe dance , RCA×2 (Front / Rear)
Ω
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.
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No. 51893
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SAFETY PRECAUTIONS

V-21ETG2
V-2124EE
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 t y and wil l fur t h er reli ev e t h e manufacturer 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 w hich 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
4.
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 the GN D is sh ow n b y the 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 broken.
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 install ation, crack ed or melted high volt age harness, poor solderi ng, etc.). To maintain the pr oper minimum level 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. Where 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.
9.
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 input and output t erm in als , Con t r ol knobs, 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 gth Test
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 ha vi ng a return p ath to the chassis should withst and a voltage of 3000V AC (r.m.s .) for a period of one secon 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 outlet ( 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 outlet ( 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 ropical area, this 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.51893
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V-21ETG2
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V-2124EE

FEATURES

New chassis design en abl es us e of an interact i ve on-s c reen control.
"
Wide range voltage (110V~240V) AC power input (AV-21ETG2).
"
With AUDIO / VIDEO INPUT & OUTPUT terminal.
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MUTING button can reduce the audio level to zero instantly.
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Functional remote control to operate TV set (for channel select, volume control, power ON/OFF, etc.) from a distance.
"
2
C bus control utilizes single chip ICs for IF, V/C, DEF. VSM PRESET, PRESET & TURBO TIMER.
I
"
By means of AUTO PROGRAM, the TV stations can be selected automatically and the TV channels can also be rearranged automatically.
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Built-in AI ECO (ECONOMY, ECOLOGY) sensor.
"
In accord ance with t he bright ness in a room , the brig htness and / of contras t of the pictur e can be ad justed aut omatically t o 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
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No. 51893
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A

FUNCTIONS

FRONT PANEL
MENU buttons
CHANNEL -/+ buttons
VOLUME -/+ buttons
ECO sensor
REMOTE CONTROL sensor
ON TIMER lamp
POWER lamp
MAIN POWER button
A/V INPUT terminal
HEADPHONE jack
V-21ETG2
V-2124EE
REAR TERMINAL
②③④
⑤⑥⑦
REMOTE CONTROL UNIT(RM-C364GY)
ANT Terminal
VIDEO INPUT Terminal
VIDEO OUTPUT Terminal
AUDIO INPUT Terminal
AUDIO OUT PUT Terminal
EC O SENSO R key
SOUND SYSTEM key
COLOUR SYSTEM key
TV/VIDEO key
OFF TIMER key
C HANN EL SCAN k ey
RETURN+key
DISPLAY key
CHANNEL -/+ key
POWER key
PICTURE MODE key
Number (CH.) key
⑬ -/--
MUTING key
MENU key
MENU ▲/▼ key MENU -/+ key
VOLUME-/+ key
key
No. 51893
5
A
V-21ETG2
A
V-2124EE

MAIN DIFFERENCE LIST

!
Part Name / Item
Model Name
AV-21ETG2 AV-2124EE
MAIN PWB SCG-1292A-H2 SCG-1293A-H2
!
DEG COIL QQW0077-001 QQW0124-001
!
FRONT CABINET GG10048-008A-H GG10048-009A-H
!
RATING LABEL LC20377-001B-H GG20014-005A-H PACKING CASE GG10056-062A-H GG10056-063A - H REMOTE CONTROL UNIT RM-C364GY-1H
!
INST. BOOK LCT1069-001A-H LCT1029-001A-H
!
DIGEST MANUAL LCT1070-001A-H WARRANTY CARD BT-54012-2 Power Input AC110~AC240V AC220~AC240V
6
No. 51893
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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. Remo ve the back board an d remove t he power c ord from t he rear cover.
4. Withdraw the rear cover toward you.
and a screw mar k ed
""""
screws marked
5
.
####
REMOVING THE MAIN PW BOARD
After rem ovi ng the rear cover.
"
1. Slightly raise the both s ides of th e M A IN PW Board b y h an d an d remove the PWB stopper of MAIN PW Board.
2. Withdraw the MAIN PW Board backward. (If necessary, take off the wire clamp , connectors etc.)
REMOVING THE SPEAKER
After rem ovi ng the rear cover.
"
1. As shown in figure, remove the
screws marke d
2
$$$$
!!!!
.
and a
V-21ETG2
V-2124EE
CHECKING THE MAIN PW BOARD
1. To check the back side of the PW Board.
1) Pull out the MAIN PW Board. (Refer to REMOVING THE MAIN PW Board)
2) Erect th e PW Boar d ver t ically so that you can easily ch eck 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 w i th oth e r PW Bo ard.
Before turning on power, make sure that the CRT earth wire and
"
other conn ec tor are prop er l y c onn ec ted.
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. 51893
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A
V-21ETG2
A
A
V-2124EE
FRONT CABI.
SPEAKER
CRT SOCKET
PWB
D
(
2)
××××
SPEAKER
MAIN PWB
HVT
REAR
COVER
D
(
2)
××××
PWB STOPER
C
B
BACK BOARD
(
5)
××××
POWER
CORD
8
No. 51893
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A
REPLACEMENT OF MEMORY ICs
1. MEMORY ICs
This mod el uses memor y ICs . This m em ory IC data ar e f or pr op er oper ation of the video and deflection circuits. When replaci n g m emor y ICs , be sure to use ICs written with the ini ti al v alu es of d ata.
V-21ETG2
V-2124EE
2. PROCEDURE FOR REPLACING MEMORY ICs
(1) Power off
Switch th e p ow er off and disc onn ec t t h e power pl ug from the wall out let.
(2) Replace ICs
Be sure to u se memory ICs written with the initial data values.
(3) Power on
Connect the power plu g int o t h e w all ou tl et and switch t h e power on.
(4) Check and set SYSTEM CONSTANT SET
It must not adjust without adjustment signals.
・・・・
1) Press the
DISPLAY
CONTROL UNIT simultaneously.
2) The SERV IC E ME NU scr een of Fig. 1 will be dis pl ay ed.
3) While the S ERVIC E MEN U is dis pl ayed, again press the
PICTURE MODE
screen of Fi g. 2 will be displa yed .
4) Check the sett i ng val ues of the SYSTEM CO N S T A NT SET of Table 1 I f t h e value is dif ferent, s elect the s etting it em with the
the correct value with the
5) Press the
DISPLAY
(5) Receiv e channel of set t i ng
Refer to the (channels preset) as described
(6) User Setting
Check th e user set ting val ue of T able 2, and if setti ng valu e is diff erent, s et the correct value. For setting, refer to the
(7) Setting of SERVICE MENU
Verif y the s etting items of t h e SE RV IC E ME NU , an d r es et w h ere necess ary. For setting, refer to the
key and the
PICTURE MODE
key of the REMOTE
DISPLAY
key s imultaneous ly, and th e SYSTEM CONSTAN T SET
▼/▲key, and set
MENU
- / + key.
MENU
key twice, and return to the normal screen.
OPERATING INSTRUCTIONS
OPERATING INSTRUCTIONS
SERVICE ADJUSTMENTS
and set the receive channels
.
.
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 : ****
: SELECT
/
- / + : OPERATE DISP : EXIT
SYSTEM CONSTANT-
SYSTEM CONSTANT SET 2
B/B SOUND : LOCK : 180 COLOUR AUTO : NO QSS : MINT ALC : NO TEXT RATE : 20
: SELECT
/
- / + : OPERATE DISP : EXIT
OFF
***
******
ⅠⅠⅠⅠ
ⅡⅡⅡⅡ
KEY ASSIGNMENT OF REMOTE CONTROL UNIT
PICTURE
MODE key
NUMBERS
SYSTEM CONSTANT-
SYSTEM CONSTANT SET 3
AMP TUNER : NO VNR : YES TEXT TABLE : CYL
: SELECT
/
- / + : OPERATE DISP : EXIT
ⅢⅢⅢⅢ
key
DISPLAY ke y
MENU
key
-/+
MENU
▼/▲
key
No. 51893
Fig.2
9
A
V-21ETG2
A
A
V-2124EE
SETTING OF SYSTEM CONSTANT SET
Setting item Setting contents
COLOUR
BILINGUAL
TUNER
ECO SENSOR
MULTI.
YES
MA
MU
YES NO
NO
Setting value
AV-21ETG2 AV-2124EE
PALTRIPLE
TRIPLE
NO
MU
YES
LANGUAGE
B/B SOUND
LOCK
COLOUR AUTO
QSS
ALC
TEXT RATE
AMP TUNER
VNR
TEXT TABLE
USER SETTING VALUES
Setting item Setting value Setting item Setting value
MAIN POWER SW OFF PICTURE MODE (VSM) BRIGHT SUB POWER ON LANGUAGE ENGLISH (ENG) CHANNEL POSITION 1 POSITION CHANNEL PRESET Refer to OPERATING INSTRUCTION
VOLUME TV/VIDEO
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
E/A/F/R
ON OFF
YES 10 20
YES
MINT
YES NO
10 20 40 80
YES NO
YES
RA CYL
E/C/R
MQSS
NO
About 10 ECO SENSOR OFF TV VNR OFF
E/R/U
230 240 250
NO
E/F
E/A/F/R E/R/U
OFF
180
NO
MINT
NO
20
NO
YES
CYL
Table 1
Table 2
10
No. 51893
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