JVC AV-21F3, AV-21FMG3B, AV-21FR3 Service Manual

3
SERVICE MANUAL
COLOUR TELEVISION
AV-21F3
AV-21FR
AV-21FMG3
BASIC CHASSIS
AV-21F3
AV-21FR3
AV-21FMG3B
[ RM -C9 0 ]
[ RM-C3 64GY]
[RM-C 364]
CG
CONTENTS
! SPECIFICATIONS ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・ ! SAFE TY PRECAUT IONS ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・ !
FEATURES・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
! FUNCTIONS ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・ !
MAIN DIFFERENCE LIST
!
SPECIFIC SERVICE INSTRUCTIONS
! SERVICE ADJUSTMENTS ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・ !
PARTS LIST
OPERATING INSTRUCTIONS
STAND ARD CIRCUIT DIAGRAM
1
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33
2-1
7 8
No. 52024
Jun. 2002
A
V-21F3
A
A
V-21FR3 V-21FMG3B

SPECIFICATIONS

ITEM
Dimen sions( W×H×D) 619mm×458mm×486.5mm
Mass 22kg
TV RF Syst em B/ G, I, D/K B/ G, I, D/K, M
Colour System
Telet ext System FLOP (Only for AV-21FR3) ×
Pi ctur e Tube
High Voltage 26.5kV±1.5kV(at zero beam current)
Receiving Frequency VHF (VL) 46.25MHz~168.25MHz
Intermediate Frequen cy
Col ou r S ub C arr ier Fr e q uen cy
RF Mode PAL / SECAM PAL / SECAM / NTSC3.58 / NTSC4.43
VIDEO Mode PAL / SECAM / NTSC3.58 / NTSC4.43
Visible size: 51cm measured diagonally
VHF (VH) 175.25MHz~463.25MHz
UHF 471.25MHz~863.25MHz
Cable TVs of Mid (X-Z, S1-S10)
CATV
VIF Carrier 38.0MHz
SIF Carrier
Super (S11-S20) & Hyper (S21-S41) bands recei vable
32.5MHz (5.5MHz)
31.5MHz (6.5MHz)
32.0MHz
PAL (4.43MHz), SECAM (4.40625MHz / 4.25MHz)
NTSC (3.58MHz / 4.43MHz)
AV - 21 F3
AV - 21 FR3
(6.0MHz)
CONTENTS
AV-21FMG3B
32.5MHz(5.5MHz) /33.5MHz (4.5MHz)
31.5MHz (6.5MHz)
32.0MHz
(6.0MHz)
Power Input Rated Voltage
Power Co nsumpti on
Speaker
Audio Output
Aer ial In pu t Termi n al
Input
Output Video 1V(p-p), 75
Headphone jack 3.5mm mini jack
Remote Control Unit
Video 1V(p-p), 75Ω (Front / Rear )
Audio
Audio 500mV(rms) (-4dBs), Low impedance,
AC110~240V, 50 / 6 0Hz
90W (Max) / 60W(Avg)
6cm×12 cm, Oval type×2
3W (monaural )
75Ω Unbalanced
500mV(rms) (-4dBs), High impedance, RCA×2 (Front / Rear)
Ω
[AV-21F3] : RM-C364G Y [AV-21FR3] : RM-C90
(Batter y size : AA / R06 / UM- 3×2)
Design and specifications are subject to change without notice.
RM-C3 64 (Batter y size : AA / R06 / UM- 3×2)
2
No. 52024
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3
A
A

SAFETY PRECAUTIONS

V-21F
V-21FR3
V-21FMG3B
1. The d es ign of th is prod uct c on ta ins sp eci al har d wa re , many circuit s and components specially for safety purp oses. For con tinu ed pr ot ection , n o c han g es sh ou ld b e ma de to the o ri g i nal d esi gn un less auth or ized in w riti n g by th e ma nu fact urer.
Replacem en t par ts must b e id ent ic al to thos e u sed in th e or i gi n al ci rcu its. Servi ce sho ul d b e per formed by qu alif ied p ers on nel on ly.
2. Alte rati on s of t he des i g 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 fact ur er 's warrant y and w ill f urth er r el i eve t he manu factu rer of r esp onsi b ility for perso na l injury or pr op erty dam ag e r es ult in g th erefr om.
3. M an y electr i c al an d m ech anic a l p ar ts in th e prod ucts ha ve special safety-related characteristics. These characteristics are oft en not e v iden t f rom vi sual insp ec ti on n or c a n t he pro tec t io n aff or de d by th em nec e ssar i l y be ob tai n ed b y u sing rep lacem en t com po ne nts ra ted f or hig he r voltag e, w att ag e, etc. Rep lacem en t p arts whic h ha ve th ese sp eci al s afet y charact erist ics ar e
ide ntified i n the parts li st of S ervice manual. El ectric al
components having such features are ide ntified by shading on t h e sche mat ics and by (!!!! ) on the parts list in Service manual. T he us e of a sub sti tu te rep lacem en t whic h do es n ot
h ave th e s ame saf ety ch ar act erist ics as t he reco mm en de d replac em ent part sh own i n th e parts li st of Ser v ice m an ual m ay
cause shock, fire, or other hazards .
4. Do n't short 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 er enc e of th e GND is s ho wn b y th e LIV E : ( ") side GN D, the ISO LATE D(N EUTRAL) : (#) si de GND and EARTH : ( $) side GND. Do n't s h or t bet we en th e LIV E sid e GN D an d
ISO LATE D(N EUTRAL) side GND or EART H side GND an d n ever m ea sur e w it h a mea sur ing a ppa ratus ( os cil lo scop e etc.) th e LI VE si d e GND an d IS OLA TED(N E UTRAL ) sid e G ND or EARTH side 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 ting shou l d b e c h ecke d or adj u ste d ( See ADJUST M ENT OF B 1 POW E R SUPPL Y).
6. The hi gh v ol ta ge applie d t o th e pi ctu r e tube mu st con form with th at s p ec ifi ed i n S er v ice m an ual. E xcess ive h igh vo lt ag e ca n
cau s e an i ncre ase in X-Ray em i ssi on , ar c i ng an d possib 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 ing occur s, r em ove t he AC power
immed i ate ly and de termine th e cause b y visua l insp ect ion (inc or r ect install at ion, cr ac ke d or mel te d high vo lt age har n ess, p oor so lder i ng, et c.) . T o m ai nt ain the p r ope r mi n im u m le vel of sof t X- R ay emis si on, c omp on ents in th e high voltag e cir c uitr y incl ud i ng t he pict ur e tube must b e t he exac t r ep l aceme nts or
alte rn at ives ap prov e d b y th e manuf act ur er of th e c omplet e prod uct.
7. Do n ot c hec k high volt ag e by drawing an ar c. Use a hi gh volt ag e meter or a hi g h v ol tag e probe wit h a V TVM . Di s cha rge th e picture tube before attempting meter connection, by connecting
a cl i p lead to the grou nd frame a nd conn ectin g th e oth er end of the lead through a 10kΩ 2W resi sto r to the an od e butt on .
8. When service i s r equ ire d, ob s er ve th e or i gina l lea d dress. Ex tr a prec aut ion sh ou ld b e given t o assure correct l ea d dress in th e high vol tag e ci r cui t a r ea. W her e a s hor t circui t h as occ u rr e d, th ose co mpon ent s tha t i ndi ca te ev ide nce of ove r hea ting sho ul d
b e r e pl ace d. A lwa ys use th e ma nuf act urer's r ep l acemen t components.
9. Isolation Check
(Safety for Electrical Shock Hazard)
Af ter re-ass emb ling th e pr odu c t, alw ays per f orm an i solat io n ch ec k on the ex po sed me tal p ar ts of t he c abin et ( a nte nn a
ter m ina ls, video /au dio inpu t and ou tput t erminals, C on trol kn obs, metal cabin et, s cr ew he ads, ea rph one jack, c on tr ol shaf ts, etc.) to be s u re the p r odu c t i s s af e t o o perate with ou t d an ger of elect rical s hoc k.
(1) Dielectric Strength Test
The is o l ati on be tween the AC pr im a ry ci rcu it an d all me tal p arts exp osed t o th e us er, p arti c ularly an y expos ed met al p art having a retu rn p ath to t he chas s is should withs tan d a volt age of 3 000 V AC (r.m.s.) for a period of one second.
(. . . . W iths tan d a vo lt ag e of 1 10 0V A C ( r .m. s .) to an ap pl ianc e
rate d up to 12 0V , an d 3 00 0V AC ( r .m. s .) to an ap pl i an ce rat ed 200V or more, for a period of one second.) This meth od of test requires a test equipment n ot g enerall y fou nd in t he s er vic e trade.
(2) Leakage Current Check
Plug th e AC l in e c ord d ir ect ly into the A C ou tlet (d o n ot use a lin e isol ati o n transf orm er dur in g this check .) . Usin g a " Leakag e
Curr ent Teste r", me asure th e lea kag e current f rom each exp osed metal p ar t of the ca bi ne t, p art icu lar l y any e x pos ed me tal p ar t h avi ng a re turn pa th to t he ch as sis , t o a kn ow n go od eart h grou nd (wa ter pi p e, e tc.) . An y l eaka ge cur r en t must not e x ceed
0.5mA AC (r.m.s.). Howev e r, i n tropic al ar ea , th is mus t no t exc e ed 0.2 mA AC (r.m.s.).
"""" Altern at e Che ck M ethod
Plug th e AC l in e c ord d ir ect ly into the A C ou tlet (d o n ot use a lin e isol ati o n transformer during t hi s che c k.). Use an AC v o lt me ter
h avi ng 1 000 oh ms pe r volt or m ore sens it i vity in th e fo llow i ng mann er . C on nec t a 1 50 0 10W res ist or para lle led b y a 0 .15µF
AC-type c apacit or bet ween an expo sed met al pa rt and a kno wn g ood e ar th gro un d ( wa ter pi pe , etc.). M eas ure th e AC volt ag e acr oss th e r es ist or with th e AC vo ltm eter . Move th e r esi s tor con nec ti on to each ex p ose d me tal par t, p art i cularly a ny exposed
metal p ar t hav in g a r etu rn pat h to the ch ass is, an d m easu re th e AC vol tag e ac ro ss the r es ist or . Now, re vers e th e plu g in th e AC ou tl et and repe at eac h m ea s ur em en t. An y vol t age measu red must no t e xceed 0 .7 5V AC (r.m.s.). This c orresponds to 0.5mA AC (r.m.s.).
Howeve r, in tropica l area, this must n ot exceed 0.3V AC ( r.m. s.) . This corresponds to 0.2mA AC (r.m.s.).
AC VOLT METER (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.52024
3
A
V-21F3
A
A
V-21FR3 V-21FMG3B

FEATURES

"
New c h assi s d esign enabl es us e of an int eractive on-scr ee n c ont ro l.
"
Wide ran ge volt age ( 1 10V240V) AC power input.
" With AUDIO / VI DEO INPUT & OUTPUT te rminal. "
MUT IN G button can r ed uce th e audi o level to z er o i nst ant l y.
" Func t ion al r em ote contr ol t o oper a te T V set (f or chann el se lect, volum e con tr ol , p ower ON /OFF , etc. ) f rom a d ist anc e. "
I2C bu s con tr ol ut ilizes single chi p ICs for IF, V /C, DE F. VSM PR ES ET, PRESET & SETUP T OUR.
" By m eans of AUTO PR OGRA M, th e TV s tatio ns c an b e s electe d automatica lly a nd th e TV chann el s c an al so b e r ear r an ged a utom atically. " The TELETEXT SYSTEM has a built-in FLOP system. (Only for AV-21FR3) "
Built- in ECO MODE (ECONOMY, ECOLOGY)
In acco rdanc e with the br ig ht nes s in a roo m, th e brig ht ness and / of con tr ast of th e p ic tur e c an b e a djus t ed autom at ically to mak e the
op ti mu m pictu re whi c h is eas y on the e ye.
" Built – in ON TIMER, RETURN + & CHILD LOCK.
SYSTEM BLOCK DIAGRAM
"
IC702
MEMORY
IC701
SCL2/SDA2 TCL/TDA
MICRO
COMPUTER
IC301
VIDEO/CHROMA
DECORDER
SCL1/SDA1
IC821
TEXT DECORDER
Only f or AV-21FR3
TU001
TUNER
4
No. 52024
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3
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FUNCTIONS

FRONT PANEL
MENU buttons
1
CHANNEL -/+ buttons
2
VOLUME -/+ bu tto ns
3
AI ECO sen sor
4
REMO TE CONTR OL s ens or
5
ON TIMER lamp
6
POWER lamp
7
MAIN POWER button
8
A/V IN PUT t ermin al
9
HEAD PHONE jack
10
V-21F
V-21FR3
V-21FMG3B
10 9 1
REAR TERMINAL
1
3 4
2
5 6 7 8
2
3
4
5
ANT Terminal
1
VIDEO INPUT Term i nal
2
VIDEO OUTPUT Terminal
3
AUDIO INPUT T ermin al
4
AUDIO OUT PUT Terminal
5
No. 52024
5
A
V-21F3
A
A
t
V-21FR3 V-21FMG3B
REMOTE CO NTRO L UN IT
RM-C90 : AV-21FR3
1
2
3
4
5
6
7
8
9
10
ECO S ENSOR ke y
1
COLOUR SY STEM ke y
11
12
13
14
15
16
17
18
2
SOUND SYSTEM key
3
DISPLAY key
4
TV/VI DEO key
5
OFF TIMER key
6
PICTURE MODE key
7
CHANNEL SC AN key
8
RETURN+key
9
CHANNEL -/+ key
10
POWER key
11
MUTING key
12
TV/TEXT key
13
MENU ke y
14
MENU ▲/▼ key
MENU / key
Number (CH.) key
15
/--
16
VOL UME / key
17
Teletext key
18
key
RM-C364GY : AV-21F3 RM-C364 : AV-21FMG3B
1
2
3
4
5
6
7
8
9
Exc e pt f or diff er enc e i n bo dy colo ur, t he Rem ote Contro l Uni
RM-C 36 4G Y and RM-C3 64 ha ve exac tl y t he s am e Fu nctions.
10
11
12
13
14
15
16
ECO S ENSOR ke y
1
SOUND SYSTEM key
2
COLOUR SY STEM ke y
3
TV/V IDEO key
4
OFF TIMER key
5
CHA NNEL SC AN k ey
6
RETURN+key
7
DISPLAY key
8
CHANNEL key
9
POWER key
10
PICTURE MODE key
11
Number (CH.) key
12
-/ --key
13
MUTING key
14
MENU ke y
15
MENU ▲/▼ key MENU -/+ key
VOL UME-/+ key
16
6
No. 52024
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3
A
A

MAIN DIFFERENCE LIST

V-21F
V-21FR3
V-21FMG3B
Part Na me
Model Name
AV-21F3 SCG-1411A-H2
AV-21FR3
AV-21FMG3B SCG-1432A-H2
Item
Model Name
AV-21F3
AV-21FR3 B/G, I, D/K PAL / SECAM
AV-21FMG3B B/G, I, D/K,&M
Main PWB Front Cabinet Remote Control Unit Pos,Serial Label
LC10394-038A-H RM-C3 64GY-1H
SCG-1402A-H2 LC10394-037A-H
LC10394-039A-H RM-C364-1H CM47385-00B-H
TV RF Syst em Col our Sy stem
B/G, I, D/K PAL / SECAM
PAL / SECAM
NTSC3.58 / NTSC4.43
RM-C90-1H
Interm ediate
Frequency
(SIF Carrier)
32.5MHz (5.5MHz)
31.5MHz (6.5MHz)
32.0MHz (6.0MHz)
32.5MHz (5.5MHz)
33.5MHz (4.5MHz)
31.5MHz (6.5MHz)
32.0MHz (6.0MHz)
Teletext System
FL OP
No. 52024
7
A
V-21F3
A
A
V-21FR3 V-21FMG3B

SPECIFIC SERVICE INSTRUCTIONS

DISASSEMBLY PROCEDURE
REMOVING THE REAR COVER
1. Unp lug the po wer pl u g.
####
!!!!
.
an d a
2. As s h own i n f igur e , remove t he 6 screws marked
screw marked "
3. Wi thdr a w t he r ear c o ver to wa rd you .
".
""
REMOVING THE MAIN PW BOARD
" After removing the rear cover.
1. Sli ght ly r ai se t he both si d es of t he MAIN PW BOARD b y ha nd .
2. Wi thdr a w t he M AIN PW B OARD b ackw ar d.
(If necess ar y, ta k e off the wire c lamp, c onn ect or s etc. )
REMOVING THE SPEAKER
"
After removing the rear cover.
1. As sh own in fi gu re, r em ove th e 2 screws marked
2. Follow th e s ame st eps wh en r em oving th e oth er ha nd sp eak er.
CHECKIN G THE MAIN PW BOARD
1. To ch eck the ba ck s ide of the PW B oar d.
1) Pu ll out the MA IN PW Bo ard. ( Ref er to RE MO VING TH E MAIN
PW B oar d)
2) Er ect th e PW Boar d vert ic al l y so th at you ca n easil y ch eck th e b ack side of th e PW Boar d.
[CAUTION]
" W hen e re cting th e PW Boar d, be caref ul s o t hat ther e w ill b e n o
con tact in g with ot her PW Boar d.
" Before turning on power, make sure that the CRT earth wire and
oth er co nne cto r ar e p rope rly c onn ect ed.
WIRE CLAMPIN G AND CABLE TYING
1. Be sure to cla mp the wir e.
2. Never r em o v e th e cable ti e use d f or tying th e wires to gethe r. Sh oul d i t be inad verte ntly r em ove d, be su re to tie th e w ires w it h a
new cable tie.
8
No. 52024
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3
A
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FRONT CABI .
V-21F
V-21FR3
V-21FMG3B
SP EAKER
C
CRT SOCKET
PWB
MAIN PWB
SP EAKER
C
POWER
CORD
REAR
COVER
B
A
No. 52024
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V-21F3
A
A
S
U
/C
QSS
OLU
OS
V-21FR3 V-21FMG3B
REPLACEMENT OF MEMORY ICs
1. MEMORY ICs
Thi s mod el u ses me mo r y I Cs. This memo r y IC da ta are f or pr o per opera tion of th e vide o a nd defl ect io n cir cuits. When r ep la cing memory ICs , b e su r e to use ICs w r it ten w i 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 ower of f and di sc o nn ect t he pow e r plu g f rom t he w al l 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 plu g i nt o the wal l ou tl et and s w itch t he po we r on .
(4) C heck and s et SY STEM CONSTAN T SET
・・・・ It must not adjust without adjustment signals.
1) Press th e DI SPLAY key and the PICTURE MODE key of the REMOTE
CONTROL UNIT simultaneously.
2) The SERVICE MENU screen of Fig. 1 will be displayed.
3) W hi le th e SE RV ICE MEN U is d is play ed , ag ain p r ess the DISPL AY key and
PICTURE MODE key simultaneously, and the SYSTEM CONSTANT SET
screen of Fig. 2 w ill b e di splayed.
4) Check th e s ettin g value s of the S YSTE M CON ST AN T S ET of T able 1 If th e
val u e is diffe re nt, sel ect the sett i ng it em wi th the MENU /key, and set
th e co rrect valu e with t he MENU - / + k ey.
5) Press the DI SPLAY ke y twice, and r etu rn to th e n or m al scr ee n.
(5) Receive channel of setting
Refe r to th e OPE RATING INST RUCTIONS and set th e r ece i ve c ha nn el s
(chan nels prese t) as descr i be d
(6) User Setting
Check t he us er s ettin g valu e of Tab le 2, a nd if se tti ng value is di f feren t, s et
th e co rrect valu e.
For setting , refer to the OPE RATING INSTRUCTIO NS.
(7) Setting of SERVICE MENU
Ve rif y the s et ting it ems of th e SER VICE MENU, and r eset whe r e n ecess a r y.
For setting , refer to the SERVICE ADJUSTMENTS.
NOTE
Alth ou gh th e k ey p osi tion of t he RM-C90 r e mote control unit is diff erent fr o m
th at of t he RM -C36 4GY & R M -C3 64 remot e co ntrol unit, the fu nctio ns of bo th
un its are th e same S o pl eas e us e th e at tach ed diagr a m for th e RM-C90
remote control unit for the RM -C36 4GY & RM-C364.
By t he way, MENU -/+ Key fu nction s in t he sam e ma nner as for / key.
KEY ASSIGNMENT OF REMOTE CONTROL UNIT
ERVICE MEN
1.IF 2.V
3.DEF 4.VSM PRESET
5.PRESET
6.SETUP TOUR OFF
1-6 SELECT DISP : EXIT
******
****** *****
***** **
************
**********
*** ** **
*** ** ** ** ***
*** ** ***** ** **
**.***
****
** ***
** ***** ***
***
******
Fig.1
SY STEM C ON STA NT- ⅠⅠⅠ
SYSTEM CONSTA NT SE T 1
COL O UR : BILIN GUAL : N O
TUNE R : MU ECO SENSOR : YES
LANG U AG E :
: SELECT
/
- / + : OPERATE DISP : EXIT
***
***
SY STEM C ON STA NT-
SYSTEM CONSTA NT SE T 2
B/B SO UND : O F F LOCK : 180
COL OUR AU TO : NO
ALC : NO TEXT R ATE : 2 0
: SELECT
/
- / + : OPERATE DISP : EXIT
: MINT
SY STEM C ON STA NT- ⅢⅢⅢ
SYSTEM CONSTANT SET 3
AMP T UNER : NO VNR : YES
TEXT TABLE : CYL
M PWM : P
V
ⅡⅡⅡⅡ
: SELECT
/
- / + : OPERATE DISP : EXIT
DI SPL A Y k ey
MENU
/ key
MENU
▼/▲
key
Fig.2
NUMBERS
PICTURE
MO DE k e y
key
(RM-C90)
10
No. 52024
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