JVC C-N14210/S Service Manual

No.51831

Aug. 2001

C-N14210

1

COPYRIGHT © 2001 VICTOR COMPANY OF JAPAN, LTD.

Aug. 2001

C-N14210

/S

CONTENTS

!

SPECIFICATIONS

････････････････････････････････

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

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

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

･････････････････････････････

2

!

SAFETY PRECAUTIONS

････････････････････････････････

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

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

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

･･･････････････････････

3

!

FEATURES

････････････････････････････････

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

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

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

････････････････････････････････ ･･･

･･････

･･･

4

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FUNCTIONS

････････････････････････････････

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

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

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

････････････････････････････････ ･･

････

･･

5

!

SPECIFIC SERVICE INSTRUCTIONS

････････････････････････････････

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

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

･･････････････････････････

･････････････

6

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SERVICE ADJUSTMENTS

････････････････････････････････

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

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

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

･････････････････････

10

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PARTS LIST

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

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

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

････････････････････････････････ ････

25

★

OPERATING INSTRUCTIONS

★

STANDARD CIRCUIT DIAGRAM

････････････････････････････････

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

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

････････････････････････････････

････････････････

2-1

SER VICE MANUAL

COLOR TELEVISION

BASIC CHASSIS

FV4

No. 51831

C-N14210

2

SPECIFICATIONS

Items Content

Dimensions (W

××××H××××

D)

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

Mass

19.8 Ibs / 9.0 kg

TV System and Color system

TV RF System
Sound System

CCIR(M)
NTSC BTSC System

TV Receiving Channels and Frequency

VL Band
VH Band
UHF Band

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

CATV Receiving Channels and Frequenc y

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

TV/CATV To tal Channel

(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 (0 1, 96～99)
180 Channels

Intermediate Frequency

Video IF Carrier
Sound IF Carrier

Color Sub Carrier

45.75MHz

41.25MHz (4.5MHz)

3.58MHz

Antenna Input Impedance

75Ω(VHF/UHF) Terminal, F-Type Connector

Power Input

120V AC, 60Hz

Power Consumpt ion

60W

Picture Tube

14” (34cm) M eas ur ed Diagon al l y

High Voltage

22.5kV±1kV (at zer o b eam current)

Speaker

3-1/16” (8cm) Round type

Audio Power Output

1W

Video Input

1Vp-p, 75

Ω

Audio Input

500mVrms ( -4dBs ), High Impedance

Earphone Jack

3.5mm mono mini jack

Remote Control Unit

RM-C205 (AA / R6 / UM-3 dry battery×2)

Design & specificat ions ar e s ubjec t to change without notice.

(54MHz～804MHz)

No.51831

C-N14210

3

SAFETY PRECAUTIONS

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 ur er 's w arranty and wil l fur t h er reli ev e the manufacturer
of responsi bility f or personal inj ury or pr operty dam age resul ting
therefrom.

3. Many electrical and mechanical parts in the products have
special safety-related charact eristics. Thes e characteristics are
often not evident f rom visual i nspection nor can t he protect ion
afforded by them n ecessar ily be obt ained by us ing rep lacem ent
componen ts rated f or higher voltag e, watt ag e, etc. R epl acem ent
parts that have t hese sp eci al safet y c h ar ac t er is tic s are ident if i ed
in the parts list of Service manual.

Electrical components
having such features are identified by shading on the
schemati cs a nd by (

!!!!

) on the parts list in Serv ice manu al.

The use of a s ubstitute repl ac ement which d oes not have the
same saf ety char acteristics as the rec ommended repl ac ement
part show n in the p arts list of S ervic e m anual m ay caus e s hoc k,
fire, or other hazards.

4.

Don't short b etween the LIVE side groun d a nd 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 GND is show 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 b e kept, a fus e or any part s 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 to th e picture tu be must conf orm 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 be k ept to a mi nimum, or should be
prevented. If severe arcing occurs, remove the AC power
immediately and determine the cause by visual inspection
(incorrec t installati on, c racked or m elted high voltage harness,
poor solderi ng, etc.). To main tain the proper min imum level of
soft X-Ray emission, components in the high voltage circuitry
includin g the picture tu be 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 connection, by connect ing
a clip le ad to th e gr oun d fr am e and c on necti ng t h e oth er end of
the lead through a 10k! 2W resistor to the anod e butt on .

8. W hen servic e is required, obser ve the origin al lead dress . Extr a
precaut ion shou ld be gi ven to assure c orrect l ead dress in th e
high voltage circuit area. Where a short circuit has occurred,
those comp onents that in dicate evi denc e of overheating should
be replaced. Always use the manufacturer's replacement
components.

9.

Isolation Check
(Safety for Electrical Shock Hazard)

After re-assembling the product, always perform an isolation
check on the exposed metal parts of the cabinet (antenna
termin als , video/audio input and output term in als , Control kn obs ,
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)

Dielectr i c St rength Test

The isol ation b etween th e AC pr imar y circuit and all metal parts
expos ed t o the 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 3 000V
AC (r.m.s .) for a period of one secon d.

(. . . . W ithstand a voltage 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 more, f or a peri od of one secon d.)
This method of test requir es test equip ment not gen erally f ound
in the service trade.

(2)

Leakage Current Check

Plug the AC lin e c or d dir ec tly into the 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 tly into the 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 sensiti vity 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 known
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 measur e th e
AC voltag e across the resis tor. N ow, re verse th e 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 , in tr opical ar ea, this m us t not exc eed 0.3V AC ( r . m.s . ).
This corresponds to 0.2mA AC (r.m.s.).

0.15μF AC-TYPE

1500

!

10W

GOOD EARTH GROUND

PLACE THIS PROBE
ON EACH EXPOSED
METAL PART

AC VOLTMETER
(HAVING 1000

!

/V,

OR MORE SENSITIVITY)

No. 51831

C-N14210

4

FEATURES

"

New chassis design enables use of a single board with simplified

circuitry.

"

Provided wi th miniature tuner (T V/ CA T V ).

"

Multifunctional remote control permits picture adjustment.

"

Adoption of the CHANNEL GUARD function prevents the

specific ch annels from being selec t ed, un l ess t he “ID nu m ber” is
key in.

"

Adoption of the VIDEO ST ATUS function.

"

Adoption of the ON/OFF TIMER function.

"

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

"

SLEEP TIMER for setting in real time.

"

Closed-caption broadcasts can be viewed.

"

Audio Video input terminal.

"

Built-in V-CHIP system.

No. 51831

C-N14210

5

FUNCTIONS

■■■■

REMOTE CONTROL UNIT

■■■■

FRONT PANEL

■■■■

REAR PANEL

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)

⑨

POWER

button

①

VIDEO(INPUT) terminal

②

AUDIO(INPUT) terminal

③

Antenna terminal

①

VIDEO STATUS key

②

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

1 2 3 4 5 6 7 8 9

1 2

3

1
2

3

4

5
6

7

8
9

10

11

12

No. 51831

C-N14210

6

SPECIFIC SERVICE INSTRUCTIONS

DISASSEMBLY PROCEDURE

REMOVING THE REAR COVER

1. Unplug the power supply cord.

2. Remove the 5 screws marked

!!!!

as shown in Fig.1.

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. Slightly raise the both s i d es of t he MAIN PW Board b y han d and
withdraw the MAIN PW Board backward.
(If necessary, t ak e off th e wir e cl am p an d c onnectors , etc .)

REMOVING THE SPEAKER

• After removing the MAIN PW board.

1. B y holding up th e SPEAKER HOLDER mark ed

""""

slightl y and
unlocking the cl aw, the SPEAKER HOLDER c an be removed.
Then you can remove the SPEAKER.

CHECKING THE MAIN PW BOARD

1. To c h eck th e backs id 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 eas ily check t he
backside of the MAIN PW Board.

[CAUTION]

•

When erecting the MAIN PWB, be careful so that there will be no
contact i ng wit h ot her P W Board.

•

Before t ur ning on p ower, m ak e s ure th at t he 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 b e inad vertent l y removed, be sur e t o t ie the wires with
a new cable tie.

No. 51831

C-N14210

7

FRONT CABINET

CRT SOCKET PWB

(Within MA IN PWB)

SPEAKER

REAR COVER

SPEAKER HOLDER

Fig.1

A

B

CONTROL KNOB

MAIN PWB

No. 51831

C-N14210

8

MEMORY IC REPLAC EMENT

1. Memory I C

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 I C replacement procedure

Procedure Screen display

(1) Power off

Switch off th e pow er and disc onn ec t t h e pow er c ord f r om t h e out l et .

(2) Replace the memory IC

Initial val u e mus t b e ent ered into th e new IC .

(3) Power on

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

(4) System constant ch eck and setting

1) Press

SLEEP TIMER

key and, while the ind icati on of “

SLEEP 0 M IN.

”

is being displ ayed, press

DISPLAY

key and

VIDEO STAT US

key on

the remote control unit simultaneously.

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

3) While the S ERVICE MENU is dis played, again simul taneously press
the DISPLA Y and VIDEO S TAT US keys to disp lay the Fi g.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 thes e dif fer, s elect t he s etting item w ith th e MENU UP/DO W N
key and adjust the setting with t he 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.

(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.

SYSTEM CONSTANT

MODEL :

*******

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

*******

V-CHIP : YES
CAN V-CHIP : YES

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

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

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

SELECT BY EXIT BY
OPERATE BY EXIT

Fig.2

SERVICE MENU
PICTURE

GAME
LOW LIGHT HIGH LIGHT
RF AFC CHK
VCO

(CW)

SELECT BY EXIT BY
OPERATE BY EXIT

Fig.1

Indicate the model name