JVC AV28BH7EEB, AV28BH7EES, AV28BH7ENB, AV28BH7ENS, AV28BH7EPB Service Manual

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Page 1

AV28BH7 E NS / AV28B H7EN

AV28BH7EPS / AV28BH7EP AV28BH7EES / AV28BH7EE

SERVICE MANUAL

COLOUR TELEVISION

AV28BH7ENS / AV28BH7ENB

AV28BH7EPS / AV28BH7EPB AV28BH7EES / AV28BH7EEB

SPECIFICATIONS ････････････････････････････････

! SAFETY PRECAUT IONS ････････････････････････････････ ! FEATU RES････････････････････････････････ !

MAIN DIFFERENCE LIST ････････････････････････････････

! SPECIFIC SERVICE INSTRUCTIONS ････････････････････････････････ !

SERVICE ADJUSTMENTS

PARTS LIST ････････････････････････････････

★ OPERATING INSTRUCTIONS ★ ST AND ARD CIRCUIT DIAGRAM ････････････････････････････････

････････････････････････････････････････････････････････････････

･････････････････････････････････････････････････････････････

････････････････････････････････････････････････････････････････

･･･････････････････････････････････････････････････････

････････････････････････････････････････････････････････････････

･･･････････････････････････････････

････････････････････････････････････････････････････････････････

･･･････････････････････････････････････････････････････

････････････････････････････････････････････････････････････････

･････････････････････････････････････････････

････････････････････････････････････････････････････････････････

････････････････････････････････

･･････････････････････････････････････････････････････

････････････････････････････････････････････････････････････････

････････････････････････････････････････････････

････････････････････････････････････････････････････････････････

･････････････････････････････ 2

･･････････････････････････････････････････････････････････

･･･････････････････････ 4

･･････････････････････････････････････････････

･･･････････････････････ 5

･･････････････････････････････････････････････

･･････････････････････

････････････････････････････････････････････

････････････････････････････････････ 21

････････････････････････････････････････････････････････････････

････････････････ 2- 1

････････････････････････････････

･･･ 5

･･････

･････････････ 6

･･････････････････････････

No.519 67 Apr. 2002

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V28BH7ENS / AV28BH7ENB

V28BH7EPS / AV28BH7EPB V28BH7EES / AV28BH7EEB

SPECIFICATIONS

Content

Item

Dimensions (W x H x D) 77cm × 58cm × 4 8cm

Mass 33.2 kg

TV RF System B/G B/G , L /L’ B/G , D /K, K1

TV Mode PA L PA L / SECA M PA L / SECA M

Colour Sy stem

Teletext System FLOF( Fast ext) / TOP

Stere o Sy st em A2 / NICAM

Tuning System Fr equenc y Synt hes izer Tun in g S ystem

Number of CH Memory Pos ition 20 0 ch

Receiving Frequency

Intermediate Frequency

Colour Sub Carr ier Frequency PAL (4.43MHz), SECA M (4.43MHz), NTSC (3.58MHz/4.43MHz)

Aerial Input Terminal 75 Oh m Un b al anc ed

Power Input AC 2 20V ~ 240V, 50H z

Power Consumpti on 17 5W ( Max.) / 1 30W ( Avg.)

Picture Tube 28 inch m ea sured dia gon ally

Hi gh Vo lt ag e 29 .5kV (in cu t-off servi ce mode)

Speake r 57 ×160 mm ellipse type ×2 + Tweeter ×2

Au dio Output 12W + 12 W

Input

Output

Remote Control Unit VE-300 15781 (RM-C85) , Ba ttery size:AA A/R03 x 2

Video Mode

VHF (VL) 46.25MHz ~ 168.25MHz

VHF (VH) 17 5.25MHz ~ 46 3.2 5MHz

UHF 47 1.2 5MHz ~ 86 3.25M Hz

CATV

VIF Carrier 38 .9 MHz

SIF Carrier

Vide o 1V(p-p), 75 Ohm

Au di o (L/R)50 0mV(rms ), H igh Im pe da nce

Vide o 1V(p-p), 75 Ohm

Au di o (L/R)50 0mV(rms ), L ow Im p edanc e

Rear Sid e

Front Side F AV (Vid eo/A ud i o)

Front Side

Rear Sid e

AV 28BH7ENS AV 28BH7ENB

PA L / NTSC 3.58 / NTSC 4.43

S1 -S 20 & S21- S4 1 & S75-S79

32.4 MHz (6.5 MHz)

32.9 MHz (6.0 MHz)

33.4 MHz (5.5 MHz)

EXT 1 ( Vide o/Audio/RGB)

EXT 2 ( Vi de o/A ud io /S- VH S)Input Terminal

Headph on e jac k (Ster e o m i ni jac k, 3.5 m m∅)

EXT 1 ( Vi d eo/ Aud i o)Output Ter minal

EXT 2 (Vid eo/ Aud io) (Se lected TV, AV 1 or AV3)

AV 28BH7EPS AV 28BH7EPB

PA L / SE C AM / NT SC 3.58 / NTSC 4.43

B/ G : S 01- S4 1 / S7 5- S7 9 L : S 01- S4 1 / S7 5-S7 7

AV 28BH7EES AV 28BH7EEB

PA L / SE CAM / NT SC 3.58 / NTSC 4.43

B/ G : S 01-S4 1 / S75-S7 9 D/ K : S01-S4 1

De sign & s p eci fications ar e subje ct to chang e wi thou t no t ice.

No.51967

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V28BH7ENS / AV28BH7EN

V28BH7EPS / AV28BH7EP V28BH7EES / AV28BH7EE

■■■■21-pin Euro connector (SCART socket) : EXT 1 / EXT 2

(P-P= Peak to Peak, S-W= Sync tip to white peak, B-W= Blanking to white peak)

Signal Designation Matching Value EXT 1 EXT 2

No .

1 AUDIO R o ut put 50 0mVr ms( N ominal),Low im pe dance

2 AUDIO R input 500mVrms(Nominal),High impedanc e ○○

3 AUDIO L o utput 50 0mVr ms( N ominal),Low im pe dance

4 AUDIO G ND

5 GND (B) ○○

○

(TV OUT)

○

(TV OUT)

○○

○

(TV/LINE OUT )

○

(TV/LINE OUT )

6 AUDIO L input 500mVrms(Nominal), High impedanc e

B-W

7B input

FUNCTON SW

(SLOW SW)

9 GND (G)

10 - NC -

11 G in put

- NC -

13 GND (R)

14 GND (YS) ○ NC

15 R / C input

16 Ys i n put Low : 0 – 0. 4, Hig h : 1 - 3 V, 75 Ω○NC

17 GND(VIDEO o utput)

18 GND(VIDEO in put) ○○

19 VID EO output

20 VID EO / Y i np ut 1V

70 0mV

Low : 0-3V, High : 8-12V, High impedance

70 0mV

R : 700mV C : 300mV

, 75Ω○

B-W

, 75Ω○

B-W

, 75Ω

P-P

, 75Ω

S-W

(Negative going sync), 75Ω

S-W

(Negative going sync), 75Ω○○

○○

○

○○

○

(R/C)

○○

○

(TV)

○

(only C)

○

(TV/LINE OUT)

21 COMMON G ND

○○

[Pin assignment]

No.51967

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V28BH7ENS / AV28BH7ENB

V28BH7EPS / AV28BH7EPB V28BH7EES / AV28BH7EEB

SAFETY PRECAUTIONS

1. The d esi gn of this prod uct con ta ins speci al hard ware, ma ny circuit s and components specially for saf ety purposes. For con tinu ed pr ot ection , n o chan g es sh ou ld b e ma de to the o riginal

d esi gn un l ess auth oriz ed in writi n g by th e ma nu fact urer. Replac em en t p arts m ust be ident ic al to thos e u sed in th e or i ginal ci rcu it s. Serv ic e sh ou ld be pe rf or me d b y q ua lified perso nn el on ly.

2. Al te rati on s of the design or ci r cui try of t he prod ucts sh oul d not be made. Any design alterations or additions will void the manufact ur er 's warrant y and will f urth er r eliev e t he ma nu factu r er of r esp onsi b ility for per so na l injur y or p rop er ty d amag e resul t ing th erefr om.

3. Many el ectr ical an d m echanica l p ar ts in th e pr od ucts ha ve special safety-related characteristics. These ch aracteristics are oft en no t e v ident f r om v isua l i nsp ection n or ca n t he pr o tec t io n aff or de d by th em nece ssar i l y be ob tain ed b y u sin g r ep lacem en t com po ne nts ra ted f or hi g he r voltage, watt ag e, etc. R ep l acem en t

p arts whic h ha ve th ese sp eci al s afet y ch ar ac t er ist ics are ide ntified i n the parts list of Servic e man ual. El ec tric al

components having such features are identified by shading on t he sche m atic s an d b y (!!!! ) on the parts list in Service manual. The us e of a s ub stitu te r ep la cemen t w hich do es n ot

h ave th e same saf ety ch ar act er ist ics as t he r eco mmen de d replac em ent part sh own i n th e p ar ts l i st of Ser vice m an ual m ay cause shock, fire, or other hazards.

4. Don't short between the LIVE side ground and ISOLATED

(NEUTRAL) 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 the GN D is sh own by the LI VE si de G ND, the ISO LATED(NEUT RAL) side GND a nd EA RTH si de GND. Don' t sh ort b etw ee n the L IVE si de GN D a nd IS OLAT E D( NEUTR AL)

si de GN D or EA R TH side GN D an d ne ver meas ure with a measu ring app ar atu s (osc illosc ope et c.) th e LIVE si d e GND an d ISO LATED(NEUTRAL) side GND or EARTH side GND at the same time. If above note 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 eck e d or adju ste d ( Se e ADJUST MENT OF B1 POWE R SUPPL Y) .

6. T he hi gh voltage app lied t o th e pic tu r e tube mu st con form wi t h th at s p ecified in S ervi ce manual. E xcessi ve high volt ag e c a n cau s e an i ncr e ase i n X- R ay em i ssi on , ar c ing 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 ing occ ur s, r emove t he AC pow er immed i ate ly an d de ter m i ne th e c a use b y visua l insp ec t io n (inc or rect ins tal lat i on, cracke d or melte d high vo lt age harn ess , p oor so lder i ng, et c.). To maint ai n the p roper min im u m le vel of sof t X- R ay em i ssi on, c omp on en ts i n th e hi gh voltag e cir cuitry incl ud ing t he pi ct ur e tu be must be t he e xact r ep l aceme nts or

alte rn at i ves ap pr ove d b y th e ma nuf act urer of th e c om pl et e product.

7. D o n ot c hec k high volt age b y dr awing an ar c. Us e a high vol t age meter or a hi g h v oltag e pr ob e wit h a V TVM. Discharge th e

picture tube before attempting meter connection, by connecting a cl i p lead to th e gr ou nd f ra me and c onn ecting th e oth er end of the lead through a 10kΩ 2W resi sto r to the an od e b utt on .

8. W hen se r vice is requ ired, ob serve th e origi na l lea d dress . Ex tr a prec aut ion sh ou ld b e g iven t o ass ur e corr ec t l ea d dr ess i n the high vol tag e c ircui t a r ea. W her e a s hort ci r cuit h as oc cu rre d, th ose co mp on ent s tha t i ndi ca te evide nce of ove r hea ting sho ul d

b e re place d. A l ways u se the manuf act ur er 's r ep l acement components.

9. Isol ation Check

(Safety for Electrical Shock Hazard)

Af ter re- ass emb l in g th e pr odu c t, al w ays per f orm an i sol at ion ch ec k on the expo sed metal parts of t he c abin et ( a ntenn a

ter m inals, video /audio inpu t and ou tput t erminals , C on trol kn obs, metal cabinet, screwheads, earphone jack, control shafts, etc.) to be s u re th e p roduct is s af e t o ope r ate with ou t dan ger of elect ri cal s hoc k.

(1) Di electric Strength Test

The i so lation be tw een the A C prima ry ci rcu it an d all me tal p arts exp osed t o th e us er , p arti cular l y any e xp os ed met al p art having a retu rn p ath to t he chass is sho uld withs tan d a vol t age of 3 000 V AC (r.m.s.) for a period of one second.

(. . . . W it hstan d a voltag e of 110 0V A C (r.m. s.) t o an ap pli anc e

rate d up to 12 0V , an d 3 00 0V AC ( r .m. s.) to an ap pl ian ce r at ed 200V or more, for a period of one second.) This meth od of test requi res a t est equipmen t n ot generally found in t he servic e trad e.

(2) Leakage Current Check

Plug th e A C l ine c ord d irect ly into th e AC ou tl et (d o not use a li n e isol ati o n tr ansf or m er du r in g thi s c h eck.) . U sing a " Lea kag e Curr ent T este r", me asur e th e lea kag e cu rre nt f rom each exp osed metal p art of the cabinet, p art icu larly any expos ed me tal p ar t h avi ng a re tur n path to the c h assis , t o a kn own good ea rt h

ground (water pip e, e tc.) . An y l eaka ge curren t m ust n ot e xceed

0.5mA AC (r.m.s.). Howev e r, i n tr op ic al area , th is must no t exce ed 0.2 mA AC (r.m.s.).

"""" Alternate Che ck M et hod

Plug th e A C l ine c ord d irect ly into th e AC ou tl et (d o not use a li n e isol ati o n tr an s for m er dur ing t hi s che c k.). Use an AC vo lt me ter h avi ng 1 00 0 ohms pe r volt or mor e s ens itivi ty in th e fo llowi ng manner. Con nec t a 1 50 0Ω 10W res ist or par a lle led b y a 0 .1 5µF

AC-type c apa c it or bet we en an ex po sed met al pa rt a nd a k no wn g ood e ar th gro un d (water pipe , etc.). M eas ure th e A C voltag e acr oss th e res ist or with th e AC voltmeter . Move th e r esi stor

con nec ti on to each exp ose d metal part, part ic ularly a ny exp os ed metal p art havin g a retu rn pat h to t he ch ass is, and measu r e the AC vol tag e ac ro ss the r es ist or. No w, re ver s e th e pl u g i n th e AC ou tl et and re pe at eac h mea s ur emen t. Any volt ag e me asured must no t e xceed 0.75V AC (r.m.s.). This c orresponds to 0 .5mA AC (r.m.s.).

Howeve r, in tropica l area, this must n ot exce ed 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 Ω 10W

GOOD EARTH GROUND

ON E A C H EX PO SE D ME T AL PA RT

No.51967

Page 5

FEATURES

V28BH7ENS / AV28BH7EN

V28BH7EPS / AV28BH7EP V28BH7EES / AV28BH7EE

1. It is a remote controlled color television.

2. 20 0 pr og r am s fr om VH F, UHF b an ds or c ab l e ch ann els can be

pres et.

3. It c an tun e c able cha nnel s.

4. C ont ro llin g the T V is v er y easy by its m en u dr i ven s yst em .

5. It h as t wo Euro connect or socke ts f or exter n al d evic e (such as vi de o r eco rder, vid eo ga mes , audio set, e tc .)

6. F ront AV Input avail a bl e.

7. St ereo s ound s ys tem s ( A2 + N IC AM) ar e availa bl e.

8. Full functio n Tele text (Faste xt, TOP).

9. It is possi b l e to connec t head phon e.

10. Direct channel access.

11 . APS (Aut om at ic P rogr am m ing Syste m). 12 . All programs ca n b e nam ed . 13 . Forwar d o r bac kw ard au to ma ti c tu ni ng .

14 . Au tomat ic sou nd mu te wh en no tran s mission . 15 . 5 mi nu tes aft er the br o adc asting (cl osedown), the T V s witch es

itsel f automatica lly t o st and - by mod e.

MAIN DIFFERENCE LIST

MODEL No.

Parts Name

MAIN PW B VE -200 84580 VE -2 00 845 99 VE -2 00 845 94

AV 28BH7ENS

(Silv er)

AV 28BH7ENB

(Black )

AV 28 B H7 EP S

(Silv er)

AV 28 B H7 EP B

(Black )

AV 28 B H7 EE S

(Silv er)

AV 28 B H7 EE B

(Black )

INST B OOK VE -5 00 233 25 VE -5 00 233 29 VE -5 00 23332

FR ON T CABIN ET VE -2 00 863 94 VE -200 86395 VE -2 00 86394 VE -2 00 86395 VE -2 00 863 94 VE -2 00 863 95

FR ON T AV D OO R VE -200 69219 VE -2 00 863 14 VE -2 00 692 19 VE -2 00 863 14 VE -2 00 69219 VE -2 00 86314

BA CK CO VE R VE -2 00 846 16 VE -2 00 690 18 VE -2 00 846 16 VE -200 690 18 VE -2 00 846 16 VE -2 00 690 18

BA CK DO OR VE -2 00 875 23 VE -200 40684 VE -2 00 87523 VE -2 00 40684 VE -2 00 875 23 VE -2 00 406 84

BUTT ON ON /O FF VE -2 00 834 91 VE -200 69016 VE -2 00 83491 VE -2 00 69016 VE -2 00 834 91 VE -2 00 690 16

BUTT ON A SS’Y VE -2 00 834 90 VE -200 81484 VE -2 00 83490 VE -2 00 81484 VE -2 00 834 90 VE -2 00 814 84

BA SE VE -2 00785 82 VE -2 00815 78 VE -200 78582 VE -200 81578 VE -2 00 785 82 VE -2 00 81578

SHAS SIS FR A ME VE -200 04005 VE -2 00 40575 VE -2 00 040 05 VE -2 00 405 75 VE -2 00 04005 VE -2 00 40575

LO GO JV C VE-4 00091 54 VE -400 09152 VE -4 00 09154 VE -4 00 09152 VE -4 00 091 54 VE -4 00 091 52

No.51967

Page 6

V28BH7ENS / AV28BH7ENB

V28BH7EPS / AV28BH7EPB V28BH7EES / AV28BH7EEB

SPECIFIC SERVICE INSTRUCTIONS

DISASSEMBLY PROCEDURE

REMOVING THE REAR COVER

1. Remove th e 8 screws marked A.

2. Remove th e 4 screws marked B.

3. W i thdr a w t he r ear co ver to wa rd you .

REMOVING THE MAIN PWB

" After removing the rear cover .

1. Draw out b ack a nd re mo ve the M AIN PW B ASS ’Y,

NOTES

Be caref ul en ough whe n d evelopi n g a m ai n c hassi s. The wire of a POWER TRANSFER does not separate and short-circuit with other parts.

REMOVING THE FRONT AV + HEADPHONE JACK PWB

After removing the rear cover.

1. Remove th e 2 screws marked C, and remove th e FR ONT AV + HEADPH ONE JAC K PW B.

REMOVING THE FRONT CONT ROL PWB

After removing the rear cover.

1. Remove the MAIN PW B AS S’Y.

2. Remove th e 5 screws marked D, and remove the FRONT CONTROL PW B.

REMOVING THE SPEAKER

After removing the rear cover.

1. Remove th e 4 screws marked E , and remove th e SP EAK ER.

2. Remove th e 2 screws marked F, and remove th e TW EETE R SPEAKER.

3. R em ove an op pos it e sid e sim ilarly .

No.51967

Page 7

(× 8)

V28BH7ENS / AV28BH7EN

V28BH7EPS / AV28BH7EP V28BH7EES / AV28BH7EE

(×4)

REAR COVER

MAIN PWB

(× 2)

FRONT CABINET

(×2)

(× 4)

C(×2)

(×4)

SP EAKER (TWEETER)

SP EAKER

No.51967

(×5)

FRONT C ONT RO L PWB

FRONT AV + HE ADPHONE JACK

PWB

Page 8

V28BH7ENS / AV28BH7ENB

V28BH7EPS / AV28BH7EPB V28BH7EES / AV28BH7EEB

SETTING OF THE LAST MEMORY FOR SHIPMENT

■■■■ USER SETTING VALUES

Setting Item Setting Value Setting Item Setting Value

SOUND MENU FEATURE MENU

BA SS CEN TER SLEEP TIMER OFF

TR EBL E

↑

CHI LD LOCK OFF

BALANCE

EFFECT OFF

PICTURE MENU INSTALL TV CONFIG. MENU

BRIGHT NES S LANGUAGE ENGLISH

COLO UR COUNT RY Other

CONTRAST

SHAR PNES S

HUE (only NTSC)

PICTURE MODE AUTO

Thes e ad j ust a re aut om atic a lly

restor ed wh en A PS bit in S ervic e

menu is set .

The proc edu r e f or se tti ng AP S

bit is described bellow.

↑

EXT-2 OUTPUT TV

■ SETTING APS “ON” IN SERVICE MENU

1) En ter serv ice me nu in TV mode by press ing “INFO” and “MUTE ” keys si mu lt an eou sly . Se rvice M en u will app ear.

2) Select VIDEO by pressing “GREEN” key on remote controller.

3) Cho ose A PS item b y pr essi n g Up/ D ow n k eys on rem ot e contr oller .

4) Cha nge th e value to “ON ” b y pressin g Left /R i ght keys on re mote con tr ol ler.

5) St ore th e chan ge b y pressi ng “ IN FO" b utt on.

6) Exit s er vic e m ode b y pres si n g “STA NDARD ” key on rem ote contr ol.

No.51967

Page 9

SERVICE ADJUSTMENTS

ADJUSTMENT PREPARATION

1. You ca n ma ke t h e nece ssa ry adjust ments f or this u nit wit h

either the Remote Control Unit or With the adjustment tools

and par ts as given below.

2. Adjustment with the Remote Control Uni t is made on the

basis of the initial setti ng va lues, however, the new setting values which set the screen to its optimum condition may

differ f rom the initia l sett ings.

3. Make sure t hat AC p ow er is tu rned on c orrec tly.

4. T urn on th e pow er for set an d tes t eq ui p me nt bef or e use , and

start t he adj ustmen t p r oced ures aft er waiting at leas t 30 m in ut es.

5. U nl ess o the rwise s pec if i ed, pr ep ar e t he mo st su itab le recep tion

or inp ut si gn al for adjust ment.

6. N ever tou ch any ad j ustm en t p arts wh ic h ar e n ot sp eci fi ed in t he list for this adjustment - variable resistors, transformers,

condensers, etc.

7. Pr es etti ng b efore adj ustm en t.

Unles s ot her wis e spec if i ed i n t he a dj ustm e nt i nstr uct ions, p r ese t

th e f ollo wing f uncti ons with th e r e mo te c ont ro l un it :

VIDEO STAT US STA ND ARD

TINT / COLOUR

PICTURE / BRIGHT

DETAIL

V28BH7ENS / AV28BH7EN

V28BH7EPS / AV28BH7EP V28BH7EES / AV28BH7EE

CENTER

ADJUSTMENT EQUIPMENT

1. DC voltmet er (or digital voltmet er)

2. Signal gen er at or (P att ern g ener ator)［PAL/SECAM/NTSC

3. Remote control unit

MAIN PARTS LOCATIONS

FRONT

HEAD PHONE J ACK

VIDEO

FRONT AV + HE ADPHONE JACK PWB

AUDIO

IC90 0

MI CO M

ME MO RY IC

FRONT CO NTROL PWB

LE D

IC30 4

］

REMOCO N RECEIVER

ME NU

（＋）

（＋）（－）

（－）

（＋）（＋）

（－）（－）

PROG

/Ch.

MAI N PWB

（＋）

（＋）（－）

（－）

（＋）（＋）

（－）（－）

VOL

TOP

FRONT

FBT

TUNER

(Ind ic ated [1 50 /11 5V] on th e bott om s ide)

No. 51967

UPPE R : FOCUS VR LOWER : SCR EEN VR

Page 10

V28BH7ENS / AV28BH7ENB

(

)

AK41 G03 5 PRODUCTION

STORE MENU>EXIT

)

OPTIONS

ADJUSTMENTS

V28BH7EPS / AV28BH7EPB V28BH7EES / AV28BH7EEB

BASIC OPERATION SERVICE MENU

■■■■ HOW TO ENTER THE SERVICE MODE

1) Press the INFORMATION key and MUTING key of REMOTE CONTROL UNIT simultaneously, and the

SERV ICE MENU screen of Fig.1 will be displayed.

REMOTE CONTROL UNI T key NAME

SERV ICE MENU (1/2

H/V V-SHIFT 000 V-SIZE 0038 H-SH IFT 12 24 H-SIZE 02 3 S-COR 027

LINR T -07 ANGLE 003 BOW 002 TRAPEZ -07 PARAB -39

U.CO R -01 L.COR 00 2 TIL T 000 TR P ZD 0 1 8

18 . 12 . 2001

VIDEO WdR 079 WdG 064 WdB 067 Cu R 06 4 Cu B 06 4

Cu G 06 4 YDP -04 AGC 04 5 APSW 2 APS O N

T_ T TH O T_P SAM YDS -06 YDN -01

DVD OFF C.M OFF BLUE ON

SERVICE

Fig.1

2) Whi l e th e Fig .1 is d ispl aye d, pr ess t he BL UE key for acce ss to the SERVICE MENU (2/2) (Fig .2).

SERVICE MENU (2/2)

PRODUCTION i>STORE MEN U>E XIT

PIP CNTR ST 000 PIP YDel ay 00 0

PIP Fram e 0 EHTHP 00 1 EHTH TC 000 EHTH -36 EHTV -14 EHTV TC 00 5

SVDEL 000 BCLTHRES T1 OSD CO NT 08 0 OSD BRI 035

TEXT BRI 030 INIT NVM Prescaler FM 015 NICA M 03 5

I2S 016 SCART 025

0.HPHONE OFF

1. CRT 4: 3

2.S-VHS OFF

3.f(IF) 38 .9

4. Tu rk ON

5. VGA O FF

6. FRON T ON

7. DPL O FF

8. VD O FF

9. NSL O N

SYSTEM

0.PAL B/G ON

1.PAL D/K OFF

2.PAL I OFF

3.SECAM B/G O N

4.SECAM B/G O FF

5.SECAM B/G O N

6.AUST. OFF

MUTING key

GREE N k ey

RED key

UP / DOW N

(

) key

INFORMATION key

YE LLOW k ey

BLUE key

COLO R k ey

LEFT / RIGHT

Fig.2

■ HOW TO EXIT SERVICE MODE

1) Press the MENU Key on REMOTE CO NTROL UNIT.

No. 51967

Page 11

OPTIONS

■■■■ SELECTION OF ADJUSTMENT ITEMS

AK41 G03 5 PRODUCTION

STORE MENU>EXIT

H/V

VIDEO

)

ADJUSTMENTS

SYSTEM

1) Press the COLOR ke y and s elect t he service menu section.

2) Selec t t he ADJ UST It em, use UP ( ) / DOWN( )

key of r em ot e c ontr o l un it.

3) To ch ange the se lected p ar am et er , us e LEFT ( )

an d RIGHT ( ) key.

4) Press the INFORMATION key to STORE.

V28BH7ENS / AV28BH7EN

V28BH7EPS / AV28BH7EP V28BH7EES / AV28BH7EE

RED key

select H/V

Do No t Adjust

RED key

select ADJUSTMENTS

GREE N key

select Prescaler

V-SHIFT 000 V-SIZE 0038

H-SH IFT 1224 H-SIZE 02 3 S-COR 027

LINR T - 07 ANGLE 003 BOW 002 TRAPEZ -07 PARAB -39

U.CO R - 01 L.COR 00 2 TILT 000 TR P ZD 01 8

18 . 12 . 2001

SERV ICE MENU (1/2

PRODUCTION i>STORE MEN U>E XIT

PIP CNTR ST 000 PIP YDel ay 00 0 PIP Fram e 0 EHTHP 00 1 EHTH TC 000

EHTH -36 EHTV -14 EHTV TC 00 5 SVDEL 000 BCLTHRES T1 OSD CO NT 08 0

OSD BRI 035 TEXT BRI 030 INIT NVM Prescaler

FM 015 NICA M 03 5 I2S 016

SCART 025

0.PAL B/G ON

1.PAL D/K OFF

2.PAL I OFF

3.SECAM B/G O N

4.SECAM B/G O FF

5.SECAM B/G O N

6.AUST. OFF

WdR 079 WdG 06 4

WdB 067 Cu R 06 4 Cu B 06 4

Cu G 06 4 YDP -04 AGC 045 APSW 2 APS O N

T_ T TH O T_P SAM YDS -06 YDN -01 DVD O FF

C.M O FF BLUE ON

SERVICE

0.HPHONE OFF

1. CRT 4: 3

2.S-VHS OFF

3.f(IF) 38 .9

4. Tu rk ON

5. VGA O FF

6. FRON T O N

7. DPL O FF

8. VD O FF

9. NSL O N

GREE N key

select VIDEO

BL UE key

access SERVICE

(SERVIC E M ENU 2/2)

BL UE key

select O PTION S

YE LLO W key

select S YSTE M

■ HOW TO EXIT SERVICE MODE

1) Press the MENU Key on REMOTE CO NTROL UNIT.

SERV ICE MENU (2/2

No. 51967

Page 12

V28BH7ENS / AV28BH7ENB

V28BH7EPS / AV28BH7EPB V28BH7EES / AV28BH7EEB

■ ADJUSTMENT SERVICE MENU & INITIAL SETTING VALUE

ADJ USTM ENT ITEM DE SCRIPTI ON INITIAL VALU E

V-SHIFT VERTICAL SHIFT CORRECTION 000

V-SIZE VERTICAL SIZE CORRECTION 0038

H-SHIFT HOR IZON TAL S HIFT CORRECTION 1224

H-SIZE HORIZONTAL SHIFT CORRECTION 023

S- C OR S -C OR RE CT I ON 02 7

LINRT LINEARITY CORRECTION -07

H/ V ANGLE ANGLE CORRECTION 003

BO W BO W CO RR E C T IO N 00 2

TRAPEZ TRAPEZI UM CORRECTION -07

PARA B PARA BOLA CORRECTION -39

U.COR UPPE R PART CORRECTION -01

L.C OR LO W E R CO RR EC T IO N 00 2

TILT TILT CORRECTION 000

TR PZD TR APE ZOID CORRECTIO N 018

WdR W hi te Bal a nc e A dj u stm ent 07 9

WdG White Balance Adj u s tm ent 06 4

WdB White Bala nce Adju stm ent 06 7

CuR C olou r Cu t –off Levels 06 4

CuB Colou r Cu t –off L evel s 06 4

CuG Col ou r Cu t –off L evel s 06 4

YDP Y-de lay P AL -04

AGC Au tom at ic Gai n Cont ro l 045

VI DEO APSW AP S Wait Time 2

AP S Au tomat ic Pr ogr a m Sor t ON

T_T Se t th e main tuner t ype THO

T_P Set the PIP tuner SAM

YDS Y-de lay S ECAM -06

YDN Y-del ay N TSC -01

DVD If the TV set h as DVD p layer, this option is se t ON. OFF

C.M

BLUE

This option toggles th e Car rier M ute functi on. If set O N, the sound is muted if the sound carrier is shifter over 1MHz.

If this op tion is se t ON, the screen is cove red with blue background when there is no video signal and between

ch annel chang es.

OFF

No. 51967

Page 13

■■■■ ADJUSTMENT SERVICE MENU & INITIAL SETTING VALUE (Do not Adjust)

V28BH7ENS / AV28BH7EN

V28BH7EPS / AV28BH7EP V28BH7EES / AV28BH7EE

ADJ USTMENT GROUP

ADJ UST

MENTS

Prescaler

OPTI ONS 4.Tu rk Tur kis h m en u la ng ua ge is visible whe n s et ON . ON

SY STEM 3.S ECAM B/G Defi n es wh ether SECA M B G st and ard is avail ab le o r no t. ON

ADJ USTM ENT ITEM DE SCRIPTI ON INITIAL VALU E

PIP CNTR ST Ad just t he c ontrast of th e p i cture insi d e th e PIP win dow. 000

PIP Y Dela y

PIP Fram e

EHTH P EHT c o mp ens ation co eff icien t f or ho riz o nta l ph ase. 00 1

EHTH TC EHT tim e c onst ant for h or izon tal p hase co mp en sation. 00 0

EHTH EH T co mp ens ation coef fic ien t for hor i zon tal am plitu de ( ±10 0%). - 36

EHTV EHT c o mp ens ation co effi cient f or vertical a mp l it ud e (±25 %). -14

EHT V T C

SV DEL

BCL T HRES

OSD CONT This ite m is used to set th e OS D an d Te letext Contr ast. 080

OSD B RI Thi s ite m is u sed to set th e OSD Brig ht ness. 03 5

TEXT BRI Thi s ite m is u sed to set th e Teletext Br igh tness . 03 0

INIT NVM Select t o initia lize th e EEPROM to the facto ry defau lts.

FM Defin es th e FM ste reo pr esc ale va lu e f or so und o utp ut po wer. 015

NICAM

I2S Defin es th e I 2S pr esc ale va lu e. 01 6

SCART Defines the SCART s o un d o utput pr esc ale va lu e. 02 5

0.HPHONE Switche d hea dp ho ne OFF

1.CRT T hi s i te m is u sed to select the t ub e. It can be s et t o 4:3 or 16: 9. 4:3

2.S-V HS If the TV se t h as a n S -VHS int erface th is item is set ON. OFF

3.f (I F) This va lu e sh ou l d b e 3 8. 9 (con tr ast) 38 .9

5.V GA T hi s i te m shou ld a lway s b e OFF . OFF

6.FRON T If the TV se t has a Front AV inter f ace this i te m is s et ON. ON

7.DP L

8.V D

9.NS L When set ON , s h ar pn ess r a nge on the p icture is i ncreas ed. ON

0.P AL B/G Defines w h eth er PAL BG sta nd is ava ila ble or no t. ON

1.P AL D / K OFF (EPS ,EPB)Defines w h eth er PAL DK st andar d is availabl e or no t.

2.P AL I D efi n es wh ether PAL I stan da rd i s av a i lable or n ot. OFF

4.SECAM D/K Defines whether SECAM DK standard is available or not. OFF

5.S EC AM L/ L’ ON ( EPS,EPB)D efi n es wheth er SEC A M L L ’ st andard is avail ab le o r not .

6.A US T. When set ON, A ustr alia c ha nne l ta ble b eco mes a vai l abl e. OFF

Ad just t he l um inan ce del ay (wit h res pec t to c olour ) of t he pic tu re insi d e th e PIP wind ow.

Deci des t he c olour an d sh ape of th e bo arder around th e PIP wi n dow.

Time constant for control of vertical and horizontal amplitude EHT c o mp ens ation .

Delay of S VMOUT in st eps of 1 2.5 ns.

(7=SVMOUT vs. RGBOUT is 60ns)

Be am cur ren t l i mit t hr esh old ad justment .

(sel ect T1 for 28 inch 4:3 tu be )

Defines the NICAM ste reo presc ale val u e f or sou nd out put

power.

If the TV set has a Dolby ProLogic sound system,

this item is set O N.

If the TV s e t h as a Virtua l Dolby s ound s yst em,

this item is set O N.

OFF (ENS,ENB)

ON ( EES,EEB)

OFF (ENS,ENB)

OFF (EES ,EEB)

00 0

00 5

00 0

03 5

OFF

No. 51967

Page 14

V28BH7ENS / AV28BH7ENB

V28BH7EPS / AV28BH7EPB V28BH7EES / AV28BH7EEB

ADJUSTMENTS

■■■■ DEFLECTION C IRCUIT

Item

AGC

adjust ment

Measuring

instrume nt

Signal

gener ator

Remote control unit

Test point Ad justment part Description

AG C

1. R eceiv e a PAL BG sign al at 60dB μV RF si gn al l eve l.

2. Select AGC with the UP/DOW N ( / ) key.

3. Ad just AGC b y pressing with the LE FT/RIGH T ( / ) key till vol ta ge at pin9 of PL20 2 is e qual to 3.0V

4. Pres s the MENU key a nd mem or iz e th e s et va lue.

V-SHIF T

adjust ment

V-SIZ E adjust ment

very close

Scr e en

size

Signal

gener ator

Remote control unit

Signal gener ator

Remote

control unit

V- SHIFT 1. R ecei ve a cir cle p att ern si g nal of ve rt ic al fr eq uency 5 0Hz.

2. Select V-SHIFT with the UP/DOW N ( / ) key.

3. Adjust V-SHIFT with the LEFT/RIGHT ( / ) key to ma ke

A = B.

4. C heck and r ea djust V-SHIFT ite m if th e adj ust me nt beco mes

impr oper aft er s om e oth er g eom et ric a djust ments are d on e.

5. Press the INFORMATION key and memorize the set valu e.

V-SIZE 1. Recei ve a cr oss- h atch signa l.

2. Select V-SIZE with t he UP/DOWN ( / ) key.

3. Adjust V-SIZE with t he LEF T/RIGHT ( / ) ke y u ntil

h oriz o nt al blac k li nes on b ot h the upp er a nd l ower par t of the

cr oss- hat ch p att ern b ecome ver y cl ose to th e u pp er an d l ower

h oriz o nt al sides of p icture si ze a nd ne ar l y ab out to di sa ppear .

4. C heck and r ea djust V-SI ZE item if the adj ustmen t b ecomes

impr oper aft er s om e oth er g eom et ric a djust ments are d on e.

Picture

size

10 0%

5. Press the INFORMATION key and memorize the set valu e.

very close

No. 51967

Page 15

V28BH7ENS / AV28BH7EN

V28BH7EPS / AV28BH7EP V28BH7EES / AV28BH7EE

Item

H- S HI FT

adjust ment

Measurin

instrume nts

Signal

gener ator

Remote control unit

Test point Ad justment part Description

H- SH IF T 1. Receiv e a c ircle p attern s ig na l.

2. Select H-SHIFT with t he UP/DOWN ( / ) key.

3. Adjust H- SHIF T with t he LEFT/R IGHT ( / ) ke y to make

C= D.

4. C heck and r e adj us t H -S HIFT i te m i f the ad justm e nt

b ecom es improper afte r s ome ot her g eom et ric a djustmen ts are done.

5. Press the INFORMATION key and memorize the set value.

H-SIZE

adjust ment

very close

Signal

gener ator

Remote control unit

Picture size 100%

Screen size

H- S IZ E 1. R ecei ve a cr oss- h atc h signa l.

2. Select H-S IZE with th e UP/DOWN ( / ) key.

3. Ad jus t H-SI ZE w ith t he LE FT /R IGHT ( / ) key ti l l ver ti cal

lin es on both the left an d right part of the cross-hatch will be vis ible nor screen will be so wide.

4. C heck an d r ea dj ust H-S IZE i t em if the a djust ment b ec om es impr oper aft er s om e oth er g eom et ric a djust ments are d on e.

5. Press the INFORMATION key and memorize the set value.

very close

No. 51967

Page 16

V28BH7ENS / AV28BH7ENB

V28BH7EPS / AV28BH7EPB V28BH7EES / AV28BH7EEB

Item

V. S-CORRE CT.

& LINEARITY adjust ment

Measurin

instrume nts

Signal gener ator

Remote

control unit

Test point Ad justment part Description

S-COR

LINRT

UPPE R

CENTER

LOW ER

1. R ecei ve a cr oss- h atc h signa l.

2. Select S-COR with the UP/DOWN ( / ) key.

3. Adjust S-COR with t he LEFT/RIGHT ( / ) key till the size of squares on b ot h th e up pe r and lower par t of cross-hat ch

p atter n beco me equ al to th e squ are lay ing on th e v erti cal center of the cross-hatch pattern.

4. C heck an d r ea dj ust S-COR i tem if the ad justm ent

b ecom es impr op er af ter s ome o ther geometr ic

adjustments are done.

5. Press the INFORMATION key and memorize the set value

6. Select LINRT with t he UP/DOWN ( / ) key.

7. Ad just L INRT with the LEFT/R IGHT ( / ) key till all the si ze of squares of the cross-hatch patte rn bec om e i n equ al

si ze f r om th e top of t he scr ee n t o it s b ott om of t he wh ole screen.

8. C heck and r ead ju st LI NRT it em if t he adju stme nt bec omes

impr ope r after some oth er g eom et ric ad justm en ts

(esp ecial l y af ter th an S-CO R ad ju stment) ar e do ne.

9. Press the INFORMATION key and memorize the set value.

ANGL E

adjust ment

Signal

gener ator

Remote control unit

ANGL E 1. R ecei ve a cr os s- h atch s igna l.

2. Select ANGLE with the UP/DOWN ( / ) key.

3. Adjust ANGL E with the LEFT/ RIGH T ( / ) key till the

vertical lines of the crosshatch pattern become straight.

4. Check and r ead j ust ANGL E it em if the adjustm en t bec om es

impr oper aft er s om e oth er g eom et ric a djust ments are d on e.

5. Press the INFORMATION key and memorize the set valu e.

No. 51967

Page 17

V28BH7ENS / AV28BH7EN

V28BH7EPS / AV28BH7EP V28BH7EES / AV28BH7EE

Item

BOW adjus tment

Measurin

instrume nts

Signal gener ator

Remote

control unit

Test point Ad justment part Description

BOW 1. R ecei ve a cr oss- h atc h signa l.

2. Se lect BOW with th e U P/ DOW N ( / ) key.

3. Adjust BOW with the L EFT/RIGHT ( / ) key and the vertical line straig ht.

4. Chec k an d read just BOW ite m if the adj ust me nt bec om es

impr oper aft er s om e oth er g eom et ric a djust ments are d on e.

5. Press the INFORMATION key and memorize the set value.

NOTE In cas e wh er e th er e i s a b ow-s hap ed di stor ti o n of

images on th e scr e en. (Figu re)

TR APEZIU M adjus tment

Signal gener ator

Remote

control unit

Parallel

TR APEZ 1. Recei ve a cross -h atch si gna l.

2. Select TRAPEZ with the UP/DOWN ( / ) key.

3. Adjust TRAPEZ with the LEFT/RIGHT ( / ) key till vertical lines , e spe ci al l y lin es at the s ides of t he pi ctur e fr am e

b ecam e par a llel to th e b oth s id es of pictur e tube as c lo se as possible.

4. C heck an d rea dj ust TR PEZ it em if th e adj ust me nt b ec omes

impr oper aft er s om e oth er g eom et ric a djust ments are d on e.

5. Press the INFORMATION key and memorize the set value.

No. 51967

Page 18

V28BH7ENS / AV28BH7ENB

V28BH7EPS / AV28BH7EPB V28BH7EES / AV28BH7EEB

Item

SI DE PIN

adjus tment

Measuring

instrume nt

Signal

gener ator

Remote control unit

Test point Adjustment part Description

PARAB 1. R ecei ve a cr oss- h atc h signal.

2. Select PARAB with the UP/DOWN ( / ) key.

3. Ad just PAR AB with th e LE FT/RIGHT ( / ) key till ve rtic al

lines cl ose to th e bo th sid es of th e pi ctur e fram e b ecome p aralle l to ve rt ic al sid es of pi ctur e tub e with out any bend ing to left or to rig ht side of t he screen.

4. C heck an d r ea dj ust PA RA B it em if th e adj ust m ent bec om es impr oper aft er s om e oth er g eom et ric a djust ments are d on e.

Parallel

5. Press the INFORMATION key and memorize the set value.

CORNER

adjus tment

Signal

gener ator

Remote control unit

Straight Str a ight

U. C OR

L.COR

1. R ecei ve a cr oss- h atc h signa l.

2. Select U.COR with the UP/DOWN ( / ) key.

3. Adjust U.COR with the LEFT/RIGHT ( / ) key till vertical

lines at th e u pp er c or ner s of the p ic tur e fr am e b ec om e ver ti cal and pa r allel to ver tic al c orn er sid es of pi ctu re tu b e.

4. C heck an d re ad ju st U.COR it em if the adj ust me nt bec omes impr oper aft er s om e oth er g eom et ric a djust ments are d on e.

5. Press the INFORMATION key and memorize the set value.

6. Select L.COR with the UP/DOW N ( / ) ke y.

7. Ad just L .COR wi th the LE FT/RIGH T ( / ) key till verti cal

lines at t he low er corners of the p ict ur e frame becom e

ver ti cal and pa r allel to ver tic al c orn er sid es of pi ctu re tu b e.

8. C heck and r ead j ust L.C OR item if th e a djust me nt be com es

impr oper aft er s om e oth er g eom et ric a djust ments are d on e.

No. 51967

Page 19

■■■■ VID EO CIRCUIT

Item

WHITE

BALANCE adjust ment

Measuring

instrume nt

Signal

gener ator

Remote control unit

V28BH7ENS / AV28BH7EN

V28BH7EPS / AV28BH7EP V28BH7EES / AV28BH7EE

Test point Ad justment part Description

WdR

WdG

WdB

1. Receiv e a bla ck & white si gn al .

2. Selec t W dR, W dG and WdB wi th t he UP /D OW N ( / ) key .

3. Ad ju st WdR, W dG and WdB with th e LE FT/ RIGH T ( / )

key.

4. Pres s the MENU key a nd mem or iz e th e s et va lue.

COLOUR

CUTO FF LEVE L

adjust ment

PAL

Y DELAY adjust ment

SE CAM Y DELAY

adjust ment

Signal

gener ator

Remote control unit

Signal

gener ator

Remote control unit

Signal gener ator

Remote

control unit

CuR

CuG

CuB

YDP 1. Receive a PAL COLOUR BAR.

YDS 1. Receive a SECAM COLOUR BAR test pattern.

1. Receiv e a cros s- h atch s igna l.

2. Sele ct CuR, CuG and CuB with the UP/DOWN ( / ) key.

3. Adjust CuR, CuG a nd CuB with the LEFT/RIGHT ( / ) key

an d s et th e values of these it ems as 64 (constant).

4. Pres s the MENU key a nd mem or iz e th e s et va lue.

2. Sele ct YDP with the UP/DOWN ( / ) key.

3. Ad ju st YD P by pressing with th e LE F T/RIGH T ( / ) key ti ll

th e colour transi e nts on th e c olou r b ar p att ern b eco me s as sh arp er an d pos si b l e as col ou rs betwee n tr an s ient s d o not

mix with each other.

4. Pres s the MENU key a nd mem or iz e th e s et va lue.

2. Sele ct YDS with the UP/DOWN ( / ) key.

3. Ad ju st YD S by pressing with th e LE F T/RIGH T ( / ) key ti ll th e colo ur tra nsi ent s on the c o l our bar pat ter n bec om es as

sh arp er an d pos si b l e as co l our s b et w een tra ns ien ts do n ot mix with each other.

4. Pres s the MENU key a nd mem or iz e th e s et va lue.

NT S C Y DELAY adjust ment

Signal gener ator

Remote

control unit

YDN 1. Recei ve a N T SC COLO UR B AR t est pat tern from a n ex ter n al

source (e.g. EXT 1).

2. Sele ct YDN with t he UP/DOWN ( / ) key.

3. Ad just YDN b y p r essing w ith th e LEFT/RIGHT ( / ) key till

th e colo ur tra nsi ent s on the c o l our bar pat ter n bec om es as sh arp er an d pos si b l e as co l our s b et w een tra ns ien ts do n ot

mix with each other.

4. Pres s the MENU key a nd mem or iz e th e s et va lue.

No. 51967

Page 20

V28BH7ENS / AV28BH7ENB

V28BH7EPS / AV28BH7EPB V28BH7EES / AV28BH7EEB

[MEMO]

No. 51967

JVC AV28BH7EEB, AV28BH7EES, AV28BH7ENB, AV28BH7ENS, AV28BH7EPB Service Manual

CONTENTS

SPECIFICATIONS

SAFETY PRECAUTIONS

FEATURES

MAIN DIFFERENCE LIST

SPECIFIC SERVICE INSTRUCTIONS

SERVICE ADJUSTMENTS