JVC C-N14210 Service Manual

SER VICE MANUAL

COLOR TELEVISION

C-N14210

BASIC CHASSIS

C-N14210

FV4

CONTENTS

SPECIFICATIONS

SAFETY PRECAUTIONS

FEATURES

FUNCTIONS

SPECIFIC SERVICE INSTRUCTIONS

SERVICE ADJUSTMENTS

PARTS LIST

★

OPERATING INSTRUCTIONS

★

STANDARD CIRCUIT DIAGRAM

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2 3 4

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6 10 25

2-1

No.51831

Aug. 2001

C-N14210

SPECIFICATIONS

Items Content

Dimensions (W Mass TV System and Color system

TV RF System Sound System

TV Receiving Channels and Frequency

VL Band VH Band UHF Band

CATV Receiving Channels an d Frequenc y

Low Band High Band Mid Band Super Band Hyper Ban d Ultr a B a nd Sub Mid Band

TV/CATV Total Channel

Intermediate Frequency

Video IF Carrier Sound IF Carrier

Color Sub Carrier

××××H××××

14-3/8”×13-1/8”×14-3/4” / 36.4cm×33.4cm×37.4cm

19.8 Ibs / 9.0 kg

CCIR(M) NTSC BTSC System

(02～06) 54MHz～88MHz (07～13) 174MHz～216MHz (14～69) 470MHz～806MHz

(02～06, A-8) by (02～06&01) (07～13) by (07～13) (A～1) by (14～22) (J～W) by (23～36) (W+1～W+28) by (37～64) (W+29～W+84) by (65～125) (A8, A4～A1) by (01, 96～99) 180 Channels

45.75MHz

41.25MHz (4.5MHz)

3.58MHz

(54MHz～804MHz)

Antenna Input Im pedance Power Input Power Consumption

Picture Tube High Voltage

Speaker Audio Power Out put Video Input Audio Input Earphone Jack

Remote Control Unit

75Ω(VHF/UHF) Terminal, F-Type Connector 120V AC, 60Hz 60W

14” (34cm) M eas ured Diag on al l y

22.5kV±1kV (at zer o b eam current)

3-1/16” (8cm) Round type 1W 1Vp-p, 7 5 500mVrms ( -4dBs ), High Impedance

3.5mm mono mini jack RM-C205 (AA / R6 / UM-3 dry battery×2)

Design & specifications are subject to change without notice.

No. 51831

SAFETY PRECAUTIONS

C-N14210

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 safety-related characteristics. These characteristics 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 that h ave these s p eci al safet y c h ar ac t er is tic s are identified in the parts list of Service manual.

having such features are identified by shading on the schemati c s and b y (

The use of a s ubstitute replacement w hich does not have the same saf ety characteris tics as the r ecommended replacement part show n in the p arts lis t of S ervic e m anual m ay caus e s hoc k, fire, or other hazards.

) on the parts list in Serv ice manu al.

!!!!

Electrical components

Don't short b etween the LIV E s ide ground and ISOL AT ED (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 rec ommended 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 bef ore attempting meter c onnect ion, 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.

Isolation Check (Saf ety for Electri cal 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 cabinet, screw"heads, ear phone jac k, control 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 requir es test equi pment not gen erally f ound 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.).

0.15μF AC-TYPE

1500

GOOD EARTH GROUND

AC VOLTMETER (HAVING 1000 OR MORE SENSITIVITY)

10W

/V,

PLACE THIS PROBE ON EACH EXPOSED METAL PART

No.51831

C-N14210

FEATURES

New chassis design enables use of a single board with simplified

circuitry.

Provided with mi ni at ure tuner (T V/ CA T V ).

Multifunctional remote control permits picture adjustment.

Adoption of the CHANNEL GUARD function prevents the

specif ic ch ann els f rom being selec t ed, un l ess t h e “ ID nu m b er” is key in.

Adoption of t h e VIDEO S T ATUS function.

Adoption of the ON/OFF TIMER function.

With 75ΩV/U in common (F-Type) ANT Terminal.

SLE EP TIMER for setting in real time.

Closed-caption broadcasts can be viewed.

Audio Video input terminal.

Built-in V-CHIP system.

No. 51831

FUNCTIONS

REMOTE CONTROL UNIT

■■■■

1 2

C-N14210

①

VIDEO STATUS key

②

5 6

8 9

DISPLAY keys

③

MUTING key

④

MENU key

⑤

POWER key

⑥

INPUT SELECT key

⑦

CHANNEL key

⑧

V-CHIP key

⑨

FUNCTION key

⑩

EXIT key

⑪

SLEEP TIMER key

⑫

VCR CONTROL keys

FRONT PANEL

■■■■

REAR PANEL

■■■■

1 2 3 4 5 6 7 8 9

①

Headphone terminals

②

MENU button

③

CHANNEL - (Operate ) button

④

CHANNEL + (Operate ) button

⑤

VOLUME - button

⑥

VOLUME + button

⑦

Remocon window

⑧

Indicator lamp (TIMER / POWER) POWER

⑨

button

① ② ③

VIDEO(INPUT) terminal AUDIO(INPUT) terminal Antenna terminal

1 2

No. 51831

C-N14210

SPECIFIC SERVICE INSTRUCTIONS

DISASSEMBLY PROCEDURE

REMOVING THE REAR COVER

1. Unplug the power supply cord.

2. Remove the 5 screws marked

3. Withdraw the REAR COVER toward you.

[CAUTION]

When reinstalling the rear cover, carefully push it inward after

•

inserting the MAIN PWB into the rear cover groove.

REMOVING THE MAIN PW BOARD

1. Slight ly raise the both sid es of the MAIN P W Board b y han d and withdraw the MAIN PW Board backward. (If necessary, t ak e off the wire clam p an d c onnectors , etc .)

as shown in Fig.1.

!!!!

REMOVING THE SPEAKER

• After removing the MAIN PW board.

1. B y holding up th e SPEAKER HOLDER mark ed unlocking the cl aw, the SPEAKER HOLDER c an be removed. Then you can remove the SPEAKER.

slightl y and

""""

CHECKING THE MAIN PW BOARD

1. To check the backsid e of the MAIN PW Board.

1) Pull out the MAIN PWB. (Refer to REMOVING THE MAIN PWB).

2) Erect th e chassis ver tically so th at you can easily c heck the backside of the MAIN PW Board.

[CAUTION]

When erecting the MAIN PWB, be careful so that there will be no

•

co n tac ting w i th oth e r PW Bo ard. Befor e tur ning on p ower, m ak e s ure th at t h e CRT earth wire and

•

other connectors are properly connected.

WIRE CLAMPING AND CABLE TYING

1. Be sure clamp the wire.

2. Never remove the cable tie used for tying the wires together. Should i t be in advert ent l y removed, b e sure to tie the w ires wit h a new cable tie.

No. 51831

FRONT CABINET

C-N14210

CRT SOCKET PWB

(Wit hin MAIN PWB)

SPEAKER

SPEAKER HOLDER

MAIN PWB

CONTROL KNOB

REAR COVER

Fig.1

No. 51831

C-N14210

(CW)

MEMORY IC REPLACEMENT

1. Memory IC

This model uses a memory IC. This memory IC stores data for proper operation of the video and deflection circuits. When replacing, be sure to use an IC containing this (initial value) data.

2. Memory IC replacement procedure

Procedure Screen display

(1) Power off

Switch off the power and dis connect th e pow er c or d fr om t h e out let.

(2) Replace the memory IC

Initial val ue must be ent ered into th e new IC .

(3) Power on

Connect the power cord to the outlet and switch on the power.

(4) S ystem constant check and setting

1) Press

SLEEP TIMER

is being displ ayed, press

key and, whil e the indicati on of “

DISPLAY

key and

VIDEO STAT US

SLEEP 0 M IN.

key on

the remote control unit simultaneously.

2) The SERVICE MENU screen of Fig.1 is displayed.

3) While th e SERVICE MENU is dis played, again simul taneously press the DISPLA Y and VIDEO STAT US keys to disp lay th e Fig.2 SYST EM CONSTANT screen.

4) Refer to t he S YSTEM C ONST ANT t able and ch eck th e settin g it ems. Where th ese dif fer, s elect t he s etting item w ith t he MEN U UP/DO W N key and adjust the setting with the MENU LEFT/RIGHT keys. (The letters of the selected item are displayed in yellow.)

5) After adjusting, release the MENU LEFT/RIGHT key to store the setting value.

6) Press the EXIT key twice to return the normal screen.

(5) Receive channel setting

Refer to the OPERATING INSTRUCTIONS (USER'S GUIDE) and s et the receive channels (Channels Preset) as described.

(6) User settings

Check the user setting items according to Table 2. Where these do not agree, refer to the OP ERATING INSTRUCTIONS (USER'S GUIDE) and set the items as described.

”

SERVICE MENU PICTURE

GAME LOW LIGHT HIGH LIGHT RF AFC CHK VCO

SELECT BY EXIT BY OPERATE BY EXIT

Fig.1

SYSTEM CONSTANT

MODEL : V-CHIP : YES CAN V-CHIP : YES

********-*****

********-*************-*****

SELECT BY EXIT BY OPERATE BY EXIT

*******

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

Fig.2

Indicate the model name

(7) SERVICE MENU setting

Verify what to set in the SERVICE MENU, and set whatever is necessary.(Fig.1) Refer to the SERVICE ADJUSTMENT for setting.

No. 51831

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