JVC AV-21E3 Service Manual

3
SERVICE MANUAL
COLOUR TELEVISION

AV-21E3

AV-21E
BASIC CHASSIS
CG

CONTENTS

! SPECIFICATIONS ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・ !
SAFETY PRECAUT IONS ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
! FEATURES・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・ ! FUNCTIONS ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・ !
SPECIFIC SERVICE INSTRUCTIONS
! SERVICE ADJUSTMENTS ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・ !
PARTS LIST
OPERATING INSTRUCTIONS
STAND AR D CIRCUIT DIAGRAM
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COPYRIGHT © 2002 VICTOR COMPANY OF JAPAN, LTD.
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31
2-1
6
No. 52028
Jul. 200 2
A
V-21E3

SPECIFICATIONS

ITEM
Dimensions(W×H×D) 497mm×454mm×478.5mm
Mass 21kg
TV RF System B/G, I, D/K,
Colour System
Picture Tube Visible size: 51cm measured diagonally
High Voltage 26. 5kV±1.5kV(at zero beam current)
Receiving Frequency VHF (VL) 46.25MHz168.25MHz
Intermediate Frequency
Colour Sub Carrier Frequency
RF Mode PAL / SECAM
VIDEO Mode PAL / SECAM / NTSC3.58 / NTSC4.43
VHF (VH) 175.25MHz~463.25MHz
UHF 471.25MHz863.25MHz
CATV
VIF Carrier 38.0MHz
SIF Carrier
Cable TVs of Mid (X-Z, S1-S10) Super (S11-S20) & Hy per (S21-S41) bands receiv able
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)
CONTENT
Power Input Rated Voltage AC110240V, 50 / 60Hz
Power Consumption 90W (Max) / 60W(Avg)
Speaker 5cm×9cm, Ov al type×1
Audio Output 3W (monaural)
Aerial Input Terminal 75Ω Unbalanced
Input Video 1V(p-p), 75Ω (Front / Rear)
Audio
Output Video 1V(p-p), 75Ω
Audio 500mV(rms) (-4dBs), Low im pedance,
Headphone jack 3.5mm mini jack
Remote Control Unit
500mV(rms) (-4dBs), High impedanc e,
RCA×2 (Front / Rear)
RM-C364GY (Battery size : AA / R06 / UM-3×2)
Design and specifications are subject to change without notice.
2
No. 52028
A

SAFETY PRECAUTIONS

V-21E3
1. The d es i gn of th is pr od uc t c on ta ins sp ecial har d ware, ma ny circuit s and components specially for saf ety purposes. For con tinu ed pr ot ecti on , n o chan g es sh ou ld be ma de to the o ri g i nal d esign un less a uth or i zed i n writin g by th e ma nu fact ur er .
Replacem ent p arts m ust b e i d entic al to thos e used in th e origin al ci rcu it s. S er vi ce sho uld b e p er formed by qu alif i ed p ers on nel on ly.
2. Alte r ation s of t he desig n or circui tr y of t he pr od ucts s h oul d not be made. Any design alterations or additions will void the manu fac t urer 's warra nt y and will f urth er r el i eve t he ma nufac tu rer of r esp onsib ili ty for per s o na l inj ur y or p r op erty dam age r esul t in g th erefr om.
3. Man y electrical an d m ec h ani c a l p ar ts i n th e pr od uc ts ha ve special safety-related chara cteristics. T hese characteristics are oft en no t e vi den t f rom vi sua l insp ection n or c a n t he pr o tect io n aff orde d by th em nece ssar i l y be ob tai n ed b y u sing rep lacem ent com po ne nts rated f or hig he r vo l tage, w att ag e, etc. Rep l acemen t p arts whic h ha ve th ese sp ecial s afet y ch ar act er ist ics ar e
ide ntified in the parts list of S ervic e manua l. El ectric al
components having such features are ide ntified by shading on the sche mat ic s and by (!!!! ) on the parts list in Service manual. The us e of a sub stitu te r ep lacem en t which do es n ot
h ave th e sam e s af ety ch aract erist ics as t he r eco mm en de d replac em ent par t sh ow n i n th e p ar ts list of Ser v i ce man ual may
cause shock, fire, or other hazards .
4. Don't shor t between the LIVE s ide ground and ISOLATED
(NE UTRAL) side ground or EARTH side ground when repairing.
Some model's power circuit is partly different in the GND. The diff erenc e of th e G ND i s sho wn b y th e LIVE : (") side GN D, the ISO LATE D(N EUTR AL) : ( #) side G ND and EAR TH : ( $) side GND. D o n't sh ort b et ween the LIV E sid e GND an d
ISO LATE D(N EUTR AL) si de GND or EAR TH side GN D an d n ever mea sure w it h a m ea sur i ng a ppa r atus (oscilloscop e etc.) th e LI VE sid e GN D an d IS OLA TED(NE UTR AL ) sid e G ND or EARTH sid e GND at the s ame time. If above not e will not be kept, a fuse or any parts will be broken.
5. If any repair has been made to the chassis, it is recommended th at t he B1 set ti ng s hou l d b e ch ec ke d or adj u s te d (Se e ADJUSTM ENT OF B 1 POW E R SUPPLY).
6. The hi gh vol ta ge app li e d t o th e pi c tu re tu be must con form wit h th at sp ec i fi ed in S er vic e m an ual . E xces siv e h i gh volt ag e ca n
cau se an i nc r e as e i n X- R ay em iss i on , arci ng an d possi b le component damage, therefore operation under excessive high voltage conditions should be kept to a minimum, or should be preve nt ed. If s ever e arc in g oc curs, r em ove t he AC pow er
immed iate l y and de ter m i ne th e cause b y visua l i nspect io n (incor r ec t in stal lat i on, cr ac ke d or melte d hi gh vo lt age har ness , p oor so lder ing, et c.) . T o m ai nt ain the p r ope r min im u m l e v el of sof t X-R ay em is sion, c ompon en ts i n th e high voltag e c ircui try incl ud i ng t he pict ur e tu be must b e t he e x act r ep l aceme nts or
alte rn at ives ap pr ov e d b y th e ma nuf act ur er of th e c om pl et e prod uct.
7. Do not c hec k high volt ag e by dr aw ing an arc. Use a hi gh volt age meter or a hig h v oltag e prob e wi t h a V T VM . Di s cha rg e th e picture tube before attempting meter connection, by connecting
a cl i p le ad to th e gr ou nd f rame a nd c onn ectin g th e oth er end of the lead through a 10kΩ 2W resis to r to the anod e b utt on .
8. When se r vice is r equ ire d, ob serve th e or i gi na l lea d dr ess. E xtr a prec aut i on sh ou ld b e g iven t o as sure correct lea d dr ess i n th e high vol tag e cir cui t a rea. W her e a s hor t ci r c uit h as occu rre d, th ose co mpon ent s tha t i ndi ca te evi de nc e of ove rhea ti ng sho ul d
b e r e pl ac e d. A l wa ys use th e ma nuf act ur er 's r ep l acemen t components.
9. Isolation Check
(Safety for Electrical Shock Hazard)
Af ter r e- ass emblin g th e p r oduct, al ways per f orm an i s ol at ion ch eck on the expo sed metal p ar ts of t he c abin et ( a nte nn a
ter m i na ls, vid eo /audio i npu t and ou tput t ermin als, Con tr ol kn obs, metal cabin et, scr ew he ad s, ea r ph one jack, c on trol shaf ts, etc.) to be su re th e p r oduct is s af e t o o pe r ate with ou t d an ger of elect ric al shoc k.
(1) Dielectric Strength Test
The iso lation be tween the A C pr ima ry c i rcu it an d al l me tal p ar ts exp osed t o the us er, p ar ticular ly an y e xpos ed met al p art h aving a retu rn p ath to t he chass is sho ul d withs tan d a volt age of 3 000 V AC (r.m.s.) for a period of one sec ond.
(. . . . W it hstan d a vo lt ag e of 1 10 0V AC ( r .m. s.) t o an ap pl ianc e
rate d up to 12 0V , an d 3 00 0V AC ( r .m. s.) to an ap plian ce rat ed 200V or more, for a period of one second.) This meth od of test r equi res a test equipment n ot g enerally fou nd in t he serv ic e trad e.
(2) Leakage Current Check
Plug th e AC l in e c ord d ir ect ly in to the A C ou tlet ( do n ot us e a li n e isol ati o n tr ansf or m er dur in g thi s ch eck.) . Usi n g a " Lea kag e
Current T este r", me as ur e th e lea kag e cu rre nt f rom each exp osed metal p ar t of the ca bine t, p art icu larly any e xpos ed me tal p art h aving a re turn path to the c h as sis , to a kn own go od ea rt h grou nd (w a ter pip e, e tc.). An y l eaka ge c ur r en t must n ot e xceed
0.5mA AC (r.m.s.). Howev e r, in tr op ic al area , th is mu st no t exce ed 0.2 mA AC (r.m.s.).
"""" Alte rn at e Che ck M et hod
Plug th e AC l in e c ord d ir ect ly in to the A C ou tlet ( do n ot us e a li n e isol ati o n tr an sfor m er dur i ng t hi s che ck .) . Use an AC vo ltmeter
h aving 1 00 0 oh ms pe r vol t or more sens it i vity i n th e fo llow ing mann er . C on nec t a 1 50 0 10W res ist or par a lle le d b y a 0 .1 5µF
AC-type c apa c it or bet ween an ex po s ed met al pa rt a nd a k no wn g ood e ar th gr o und ( water pi pe , etc.) . M eas ur e th e A C vo lt ag e acr oss th e res ist or with th e AC vo l tm eter. Move th e r es istor con nec tion to e ac h expose d metal par t, p art icul ar l y a ny exp osed
metal p ar t havi n g a r etu rn pat h to the ch assi s, an d m easu r e th e AC vol tag e ac ross the res ist or . No w , re v er se th e pl u g in th e AC ou tl et and r e pe at eac h m ea s ur em en t. An y volt ag e me asu re d must no t e xceed 0 .7 5V AC (r.m. s.) . This c orre sponds to 0.5mA AC (r.m.s.).
Howeve r, in tropica l are a, this must n ot exce ed 0 .3V AC ( r.m.s.). This corresponds to 0.2mA AC (r.m.s.).
AC VOLT MET ER (HAVING 1000 Ω /V, OR MOR E SENSIT IVITY)
0.15μF AC-T YPE
PLACE THIS PROBE
1500 10W
GOOD EARTH GROUND
ON E A C H EX PO SE D ME T AL PA RT
No.52028
3
A
V-21E3

FEATURES

"
New c h as sis d es i gn en ables us e of an i nt eracti ve on- scr ee n cont ro l.
"
Wide ran ge volt age (1 10V 240V) AC power input.
" With AUD IO / VI DEO INPUT & OU TPUT te rmi nal. "
MUT IN G button can red uce th e audi o level to zer o i nst ant ly.
" Func t ion al r em ote co ntrol t o opera te T V set (f or ch annel s e l ect, volume c ontrol, p ow er ON /OFF, etc . ) f rom a d ist anc e. "
I2C bu s con tr ol ut i lizes singl e chip ICs for IF, V /C , D EF. V SM PRES ET, PR ESET & S ETUP TOU R.
" By m eans of AUTO PR OGRA M, the T V s tati o ns c an b e s electe d autom atica lly a nd the TV cha nn els c an al so b e rearr an ge d aut omatic al ly. " Built-in ECO MO DE (ECONOM Y, ECOLOGY)
In acco rdanc e with th e br ig ht ness i n a r oo m, th e br ig ht ness and / of con tr ast of th e p icture can b e a djus t ed au tomat ic ally to m ake th e op ti mu m pictu re which is eas y on th e e ye.
"
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
4
No. 52028
A

FUNCTIONS

FRONT PANEL
10 9 1 2 3 4 5 6 7 8
MENU buttons
1
CHANNEL -/+ buttons
2
VOLUME -/+ bu tto ns
3
AI ECO se nsor
4
REMO TE CON TROL s ens or
5
6
ON TIMER lamp
PO W E R la mp
7
MAIN POWER button
8
9
A/V IN PUT t erminal
10
HEAD PHONE jack
V-21E3
REAR TERMINAL
1
REMOTE CONT RO L UN IT
1
2
3
4
5
6
7
8
9
ANT Terminal
1
2
3
4
5
10
11
12
13
14
15
16
2
VIDEO INPUT Term i nal
3
AUDIO INPUT T ermin al
4
AUDIO OUTPUT Terminal
5
VIDEO OUTPUT Terminal
ECO S ENSOR ke y
1
SOUND SYSTEM key
2
COLO UR SY STEM ke y
3
TV/V IDEO ke y
4
OFF TIMER key
5
CHAN NE L SCAN k ey
6
RETURNkey
7
DISPLAY key
8
CHANNEL key
9
POWER key
10
PICTURE MODE key
11
Number (CH.) key
12
/--key
13
MUTING ke y
14
MENU ke y
15
MENU ▲/▼ key
MENU -/+ key
VOL UME-/+ key
16
No. 52028
5
A
V-21E3

SPECIFIC SERVICE INSTRUCTIONS

DISASSEMBLY PROCEDURE
REMOVING THE REAR COVER
1. U np lug the po we r plu g.
$.
$$
!!!!
an d a
2. As s h own in f i gur e , remove t he 5 screws marked
screw marked "
3. R em ov e th e b ack bo ar d an d re mo ve the p ow er c ord f rom th e
rear c over.
4. Withdr a w t he r ear co ver to wa rd you .
"and a s crew m arked ####.
""
REMOVING THE MAIN PW BOARD
" After removing the rear cover.
1. Slight l y raise t he bo th side s of th e M AIN PW Boa rd b y han d and remove the PW B stop per of MAIN P W Bo ard .
2. Withdr a w t he M AIN PW Boa rd backw ar d. (If nec ess ar y , take off the w ire cl am p, c onn ect or s etc. )
REMOVING THE SPEAKER
" After removing the rear cover.
1. As s h ow n i n figu r e, remove the 2 screws marke d $
CHECKIN G THE MAIN PW BOARD
1. To c h ec k the back s ide of the PW B oard.
1) Pu ll out the MA IN PW Boar d. (Ref er to RE MO VING THE M AIN PW B oard)
2) Erec t th e PW Board vert ic al l y so th at you ca n easily check th e b ack side of the PW B oard.
[CAUTION]
" W hen e re cting th e PW Boar d, be caref ul s o t hat there w ill b e n o
contacting with other PW Board.
" Before turning on power, make sure t hat the CRT earth wire and
oth er c o nne cto r ar e p rope rl y c onnect ed.
WIRE CLAMPIN G AND CABLE T Y ING
1. Be sure to cla mp the wire.
2. Never r em o ve th e c able tie used f or tyi ng the w i re s to gethe r. Sh oul d i t be inad verte ntly remove d, be su re to ti e th e wi r es with a
new cable tie.
6
No. 52028
A
FRONT CABI.
V-21E3
CRT SOCKET
PWB
SP EAKER
MAIN PWB
HV T
D
(××××2)
REAR
COVER
PWB STOPE R
C
(×××× 1)
B
(××××1)
BACK BOARD
A
(×××× 5)
POWER
CORD
No. 52028
7
A
V-21E3
S
U
/C
COLOU
O
REPLACEMENT OF MEMORY ICs
1. MEMORY ICs
Thi s m od el u ses me mo r y I Cs. Thi s me mo r y IC da ta ar e f or pr o per opera tion of th e vide o and deflect ion circui ts . When r ep la cing me m ory IC s, b e s u r e to us e ICs w r it ten wi th t he ini tial v a lu es of dat a.
2. PROCEDURE FOR REPLACIN G MEMORY ICs
(1) Power off
Switch the p ow er of f and di sco nnect t he pow e r pl u g from t he wall out let.
(2) Replace ICs
Be sure to use memory ICs written with the initial data values.
(3) Power on
Connect th e pow er pl u g int o the wal l ou tl et and s witch t he powe r on .
(4) C heck an d set SY STEM CO NSTANT SET
・・・・ It must not adjust without adjustment signals.
1) Press the DI SPLAY ke y and th e PICTURE MODE key of the REMOTE
CONTROL UNIT simultaneously.
2) The SERVICE MENU screen of Fig. 1 will be displayed.
3) W hil e the SE RV ICE MENU is displ ayed , ag ain press the DISPL AY key and
PICTURE MODE ke y si m ul ta neo usly, an d t he S YSTEM CONSTA NT SE T
screen of Fig. 2 will b e displa ye d.
4) C heck th e s ett in g valu es of th e SYS T EM C ON ST A NT SET of T able 1 If th e
valu e is diff er ent, se lect the s ettin g item with th e MENU /key, and set
th e co rr ect valu e w ith t he MENU - / + k ey.
5) Press the DI SPLAY k e y tw i ce, and retu rn to th e n ormal sc r ee n.
(5) Receive channel of setting
Refe r to th e OPE R ATI NG INST RUCTIONS and set the r ece ive c ha nn els
(chan nels prese t) as desc r ibe d
(6) User Setting
Check t he us er s ettin g valu e of T ab l e 2, a nd if se tting value is dif feren t, set
th e co rr ect valu e.
For setting , r ef er to the OPE RATING INSTRUCTIO NS.
(7) Setting of SERVICE MENU
Ve rif y the set ti ng it ems of th e SE RVIC E M ENU, and reset w he re n ecess a r y.
For setting , r ef er to the SERVICE ADJUSTMENTS.
KEY ASSIGNMENT OF REMOTE CONTROL UNIT
1.IF 2.V
3.DEF 4.VSM PRESET
5.PRESET
6.SETUP TOUR OFF
1-6 SELECT DISP : EXIT
******
****** *****
************
SYSTEM CONSTA NT SET 1
: SELECT
- / + : OPERATE DISP : EX IT
SYSTEM CONSTA NT SET 2
: SEL - / + : OPE DISP : E XIT/
ERVICE MEN
***** **
* *.****
* * * *
****
********
** ***
** ***** ***
**********
*** ** **
*** ** ** ** ***
*** ** ***** ** **
Fig.1
SY STEM C ON STANT-
R : TRIPLE BILINGUAL : NO TUNE R : MU
ECO SENSOR : YES LANG UAG E : E / R
/
SY STEM C ON STANT- ⅡⅡⅡ
B/B SO UND : OFF LOCK : 180
COL OUR AU TO : NO QSS : MINT ALC : NO
TEXT R ATE : 2 0
SY STEM C ON STANT- ⅢⅢⅢ
ⅠⅠⅠⅠ
PICTURE
MO DE k e y
NUMBERS
SYSTEM CONSTA NT SET 3
AMP TUNER : N VNR : YES TEXT TABLE : CYL
VOLUM PWM : POS
key
: SEL - / + : OPE DI SP : EXIT/
DISPLAY
key
MENU
-/+
key
8
MENU
/ key
No. 52028
Fig.2
A
SE TTING OF SY ST EM CONST ANT SET
Setting item Setting contents Setting value
V-21E3
COLOUR
BILINGUAL
TUNER
AI ECO S ENSOR
LA NG UA G E
B/B SOU ND
LO CK
COLOUR AUTO
QSS
ALC
TEXT RATE
AMP TUNER
VNR
TEXT TABLE
VOL UM PW M
MUL TI . PA LTRIPLE
YE S NO
MA
MU
YE S NO
E/R/A /P
ON OFF
YES 10 20 230 240 250
YE S NO
MI NT MQ SS
YE S NO
10 20 40 80
YE S NO
YE S NO
ARA CYL
POS
E/R
NEG
Table 1
TRIPLE
NO
MU
YE S
E / R
OFF
18 0
NO
MI NT
NO
20
NO
YE S
CYL
POS
USER SE TTING V ALU ES
Setting item Setting value Setting ite m Setting value
SUB POWER ON LANGUAGE ENGLISH
CHA NNEL PO SITIO N 1 PO SITIO N CHA NNEL PRESET Refe r t o OPE RATIN G I NS T RUCTION
VOL UME About 10 AI ECO S EN SOR OFF
TV/V IDEO
ON SCR EEN DI SPLAY
COLOUR SYSTEM PAL ON TIMER PR1 0:00
SOUND SYSTEM B / G BLUE BACK OFF
OFF TIMER OFF OSD.Shows 00 CHI LD LO CK OFF
PICTURE MODE (VSM) BRIGHT SETUP TOUR ON
TV VNR OFF
POSITION IND ICATIO N AUTO SHUTOFF OFF
Table 2
No. 52028
9
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