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

AV-21F3

AV-21FR3

AV-21FMG3B

SERVICE MANUAL

COLOUR TELEVISION

AV-21F3

AV-21FR3 AV-21FMG3B

BASIC CHASSIS

CG

[ RM-C90 ] [ RM-C364GY] [RM-C364]

CONTENTS

!SPECIFICATIONS 2

!SAFETY PRECAUTIONS 3

!FEATURES 4

!FUNCTIONS 5

!MAIN DIFFERENCE LIST 7

!SPECIFIC SERVICE INSTRUCTIONS 8

!SERVICE ADJUSTMENTS 15

!PARTS LIST 33

OPERATING INSTRUCTIONS

STANDARD CIRCUIT DIAGRAM 2-1

1	COPYRIGHT © 2002 VICTOR COMPANY OF JAPAN, LTD.	No. 52024
		Jun. 2002

AV-21F3

AV-21FR3

AV-21FMG3B

SPECIFICATIONS

	ITEM			CONT ENTS
				AV-21F3	AV-21FMG3B
				AV-21FR3
	Dimensions(W×H×D)			619mm×458mm×486.5mm
	Mass			22kg
	TV RF System			B/G, I, D/K	B/G, I, D/K,M
			RF Mode	PAL / SECAM	PAL / SECAM / NTSC3.58 / NTSC4.43
	Colour System
			VIDEO Mode	PAL / SECAM / NTSC3.58 / NTSC4.43
	Teletext System			FLOP (Only for AV-21FR3)	×
	Picture Tube			Visible size: 51cm measured diagonally
	High Voltage			26.5kV±1.5kV(at zero beam current)
	Receiving Frequency VHF (VL)			46.25MHz 168.25MHz
			VHF (VH)	175.25MHz 463.25MHz
			UHF	471.25MHz 863.25MHz
				Cable TVs of Mid (X-Z, S1-S10)
			CATV	Super (S11-S20) & Hyper (S21-S41)
				bands receivable
	Intermediate		VIF Carrier	38.0MHz
				32.5MHz (5.5MHz)	32.5MHz(5.5MHz) /33.5MHz (4.5MHz)
	Frequency
			SIF Carrier	31.5MHz (6.5MHz)	31.5MHz (6.5MHz)
				32.0MHz (6.0MHz)	32.0MHz (6.0MHz)
				PAL (4.43MHz),
	Colour Sub Carrier Frequency			SECAM (4.40625MHz / 4.25MHz)
				NTSC (3.58MHz / 4.43MHz)
				AC110 240V, 50 / 60Hz
	Power Input	Rated Voltage
	Power Consumption			90W (Max) / 60W(Avg)
	Speaker			6cm×12 cm, Oval type×2
	Audio Output			3W (monaural)
	Aerial Input Terminal			75Ω Unbalanced
	Input	Video		1V(p-p), 75Ω (Front / Rear)
		Audio		500mV(rms) (-4dBs), High impedance,
				RCA×2 (Front / Rear)
	Output	Video		1V(p-p), 75Ω
		Audio		500mV(rms) (-4dBs), Low impedance,
	Headphone jack			3.5mm mini jack
				[AV-21F3]	RM-C364
	Remote Control Unit			: RM-C364GY	(Battery size : AA / R06 / UM-3×2)
				[AV-21FR3]
				: RM-C90
				(Battery size : AA / R06 / UM-3×2)

Design and specifications are subject to change without notice.

2

No. 52024

AV-21F3

AV-21FR3

AV-21FMG3B

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 manufacturer's warranty and will further relieve the manufacturer of responsibility for personal injury or property damage resulting therefrom.

3.Many electrical and mechanical parts in the products have special safety-related characteristics. T hese characteristics are often not evident from visual inspection nor can the protection afforded by them necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special safety characteristics are

identified in the parts list of Service manual. Electrical components having su ch features are identified by shading on the schematics and by (!) on the parts list in Service manual. The use of a substitute replacement which does not have the same safety characteristics as the recommended

replacement part shown in the parts list of Service manual may cause shock, fire, or other hazards .

4.Do n't short between the LIVE side ground and ISOL ATED (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 shown by 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 measure with a measuring apparatus (oscilloscope etc.) the LIVE side GND and ISOLATED(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 that the B1 setting should be checked or adjusted (See ADJUSTMENT OF B1 POWER SUPPLY).

6.The high voltage applied to the picture tube must conform with

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 voltage conditions should be kept to a minimum, or should be prevented. If severe arcing occurs, remove the AC power

immediately and determine the cause by visual inspection (incorrect installation, cracked or melted high voltage harness, poor soldering, etc.). To maintain the proper 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 before attempting meter connection, by connecting

a clip lead to the ground frame and connecting the other end of the lead through a 10kΩ 2W resistor to the anode button.

8.When service is required, observe the original lead dress. Extra precaution should be given to assure correct lead dress in the high voltage circuit area. W here a short circuit has occurred, those components that indicate evidence 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

terminals, video/audio input and output terminals, Control knobs, metal cabinet, screwheads, earphone jack, control shafts, etc.) to be sure the product is safe to operate without danger of electrical shock.

(1)Dielectric Strength Test

The isolation between the AC primary circuit and all metal parts exposed to the user, particularly any exposed metal part having a return path to the chassis should withstand a voltage of 3000V AC (r.m.s.) for a period of one second.

(. . . . Withstand a voltage of 1100V AC (r.m.s.) to an appliance

rated up to 120V, and 3000V AC (r.m.s.) to an appliance rated 200V or more, for a period of one second.)

This method of test requires a test equipment not generally found in the service trade.

(2)Leakage Current Check

Plug the AC line cord directly into the AC outlet (do 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.). Any leakage current must 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 line cord directly into the AC outlet (do not use a line

isolation transformer during this check.). Use an AC voltmeter having 1000 ohms per volt or more sensitivity in the following manner. Connect a 1500Ω 10W resistor paralleled by a 0.15µF

AC-type capacitor between an exposed 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 connection to each exposed metal part, particularly any exposed

metal part having a return path to the chassis, and measure the AC voltage across the resistor. Now, reverse 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, in tropical area, this must not exceed 0.3V AC ( r.m.s.). This corresponds to 0.2mA AC (r.m.s.).

AC VOLTMETER (HAVING 1000 Ω/V,

OR MOR E SENSITIVITY)

0.15μF AC-TYPE

PLACE THIS PROBE

ON EACH EXPOSED

1500 Ω 10W	METAL PART
GOOD EARTH GROUND

No.52024

3

AV-21F3

AV-21FR3

AV-21FMG3B

FEATURES

"New chassis design enables use of an interactive on-screen control.

"Wide range voltage (110V 240V) AC power input.

"With AUDIO / VIDEO INPUT & OUTPUT terminal.

"MUTING button can reduce the audio level to zero instantly.

"Functional remote control to operate T V set (for channel select, volume control, power ON/OFF, etc.) from a distance.

"I2C bus control utilizes single chip ICs for IF, V/C, DEF. VSM PRESET, PRESET & SETUP TOUR.

"By means of AUTO PROGRAM, the TV stations can be selected automatically and the TV channels can also be rearranged automatically.

"The TELETEXT SYSTEM has a built-in FLOP system. (Only for AV-21FR3)

"Built-in ECO MODE (ECONOMY, ECOLOGY)

In accordance with the brightness in a room, the brightness and / of contrast of the picture can be adjusted automatically to make the optimum picture which is easy on the eye.

"Built – in ON TIMER, RETURN + & CHILD LOCK.

SYSTEM BLOCK DIAGRAM

"

IC301

TU001

VIDEO/CHROMA

DECORDER

TUNER

IC702

MEMORY

IC701

SCL 1/SDA1

SCL 2/SDA2

MICRO

TCL/TDA

COMPUTER

IC821

TEXT DECORDER

Only for AV-21FR3

4

No. 52024

FUNCTIONS

■FRONT PANEL

10

9

1

2

3

4

5

6

7

8

■REAR TERMINAL

	2
1	3
	4
	5

AV-21F3

AV-21FR3

AV-21FMG3B

1 MENU buttons

2 CHANNEL / buttons

3 VOLUME / buttons

4 AI ECO sensor

5 REMOTE CONTROL sensor

6 ON TIMER lamp

7 POWER lamp

8 MAIN POWER button

9 A/V INPUT terminal

10 HEADPHONE jack

1 ANT Terminal

2 VIDEO INPUT Terminal

3 VIDEO OUTPUT Terminal

4 AUDIO INPUT T erminal

5 AUDIO OUT PUT Terminal

No. 52024

5

AV-21F3

AV-21FR3

AV-21FMG3B

■REMOTE CONTROL UNIT

RM-C90 : AV-21FR3

1	11
2	12
3	13
4	14
5
6	15
7
8	16
9	17
10
	18

RM-C364GY : AV-21F3	RM-C364 : AV-21FMG3B
1
2	10
3	11
4
5	12
6
7	13
8	14
	15
9	16

Except for difference in body colour, the Remote Control Unit RM-C364GY and RM-C364 have exactly the same Functions.

1ECO SENSOR key

2COLOUR SYSTEM key

3SOUND SYSTEM key

4DISPLAY key

5TV/VIDEO key

6OFF TIMER key

7PICTURE MODE key

8CHANNEL SCAN key

9RETURN key

10CHANNEL / key

11POWER key

12MUTING key

13TV/TEXT key

14MENU key

MENU ▲/▼ key

MENU / key

15Number (CH.) key

16/ key

17VOLUME / key

18Teletext key

1 ECO SENSOR key

2 SOUND SYSTEM key

3 COLOUR SYSTEM key

4 TV/VIDEO key

5 OFF TIMER key

6 CHANNEL SCAN key

7 RETURN key

8 DISPLAY key

9 CHANNEL key

10POWER key

11PICTURE MODE key

12Number (CH.) key

13/ key

14	MUTING key
15	MENU key
	MENU ▲/▼ key
	MENU / key
16	VOLUME / key

6

No. 52024

AV-21F3

AV-21FR3

AV-21FMG3B

MAIN DIFFERENCE LIST

	Part Name	Main PWB	Front Cabinet	Remote Control Unit	Pos,Serial Label
	Model Name
	AV-21F3	SCG-1411A-H2	LC10394-038A-H	RM-C364GY-1H
	AV-21FR3	SCG-1402A-H2	LC10394-037A-H	RM-C90-1H
	AV-21FMG3B	SCG-1432A-H2	LC10394-039A-H	RM-C364-1H	CM47385-00B-H

	Item			Intermediate
		TV RF System	Colour System	Frequency		Teletext System
Model Name
				(SIF Carrier)
				32.5MHz (5.5MHz)
AV-21F3		B/G, I, D/K	PAL / SECAM	31.5MHz (6.5MHz)
				32.0MHz (6.0MHz)
AV-21FR3		B/G, I, D/K	PAL / SECAM					FLOP
				32.5MHz (5.5MHz)
AV-21FMG3B		B/G, I, D/K,&M	PAL / SECAM	33.5MHz (4.5MHz)
			NTSC3.58 / NTSC4.43	31.5MHz (6.5MHz)
				32.0MHz (6.0MHz)

No. 52024

7

AV-21F3

AV-21FR3

AV-21FMG3B

SPECIFIC SERVICE INSTRUCTIONS

DISASSEMBLY PROCEDURE

REMOVING THE REAR COVER

1.Unplug the power plug.

2.As shown in figure, remove the 6 screws marked ! and a screw marked ".

3.Withdraw the rear cover toward you.

REMOVING THE MAIN PW BOARD

"After removing the rear cover.

1.Slightly raise the both sides of the MAIN PW BOARD by hand.

2.Withdraw the MAIN PW BOARD backward.

(If necessary, take off the wire clamp, connectors etc.)

REMOVING THE SPEAKER

"After removing the rear cover.

1.As shown in figure, remove the 2 screws marked #.

2.Follow the same steps when removing the other hand speaker.

CHECKING THE MAIN PW BOARD

1.To check the back side of the PW Board.

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

2)Erect the PW Board vertically so that you can easily check the back side of the PW Board.

[CAUTION]

"When erecting the PW Board, be careful so that there will be no contacting with other PW Board.

"Before turning on power, make sure that the CRT earth wire and other connector are properly connected.

WIRE CLAMPING AND CABLE TYING

1.Be sure to clamp the wire.

2.Never remove the cable tie used for tying the wires together. Should it be inadvertently removed, be sure to tie the wires with a new cable tie.

8

No. 52024

FRONT CABI.

SPEAKER

C

POWER

CORD

AV-21F3

AV-21FR3

AV-21FMG3B

SPEAKER

C

CRT SOCKET

PWB

MAIN PWB

REAR

COVER

B

A

No. 52024

9

AV-21F3

AV-21FR3

AV-21FMG3B

REPLACEMENT OF MEMORY ICs

1. MEMORY ICs

This model uses memory ICs. This memory IC data are for proper operation of the video and deflection circuits. When replacing memory ICs, be sure to use ICs written with the initial values of data.

	2. PROCEDURE FOR REPLACING MEMORY ICs				SERVICE MENU
	(1) Power off
					1.IF	2.V/C
	Switch the power off and disconnect the power plug from the wall outlet.
					3.DEF	4.VSM PRESET
	(2) Replace ICs				5.PRESET
					6.SETUP TOUR OFF
	Be sure to use memory ICs written with the initial data values.
					1-6 SELECT		DISP : EXIT
	(3) Power on
					****** *****		**.***
	Connect the power plug into the wall outlet and switch the power on.
					*** ** ** **		***
	(4) Check and set SYSTEM CONSTANT SET
	It must not adjust without adjustment signals.					Fig.1
	1) Press the DISPLAY key and the PICTURE MODE key of the REMOTE
	CONTROL UNIT simultaneously.
	2) The SERVICE MENU screen of Fig. 1 will be displayed.
	3) While the SERVICE MENU is displayed, again press the DISPLAY key and				SYSTEM CONSTANT-
	PICTURE MODE key simultaneously, and the SYSTEM CONSTANT SET
	screen of Fig. 2 will be displayed.				SYSTEM CONSTANT SET			1
	4) Check the setting values of the SYSTEM CONSTANT SET of T able 1 If the
					COLOUR		: ***
	value is	different, select the setting item with the MENU ▼/▲key, and set
					BILINGUAL		: NO
	the correct value with the MENU - / + key.
					TUNER		: MU
	5) Press the DISPLAY key twice, and return to the normal screen.				ECO SENSOR		: YES
	(5) Receive channel of setting				LANGUAGE		: ***
	Refer to	the OPERATING INST RUCTIONS and set the receive channels			/	: SELECT	DISP : EXIT
	(channels preset) as described				- / + : OPERATE
	(6) User Setting
	Check the user setting value of Table 2, and if setting value is different, set				SYSTEM CONSTANT-
	the correct value.
	For setting, refer to the OPERATING INSTRUCTIONS.				SYSTEM CONSTANT SET			2
	(7) Setting of SERVICE MENU				B/B SOUND		: OFF
	Verify the setting items of the SERVICE MENU, and reset where necessary.				LOCK		: 180
	For setting, refer to the SERVICE ADJUSTMENTS.				COLOUR AUTO		: NO
					QSS		: MINT
	NOTE				ALC		: NO
					TEXT RATE		: 20
	Although the key position of the RM-C90 remote control unit is different from
					/	: SELECT
	that of the RM-C364GY & RM-C364 remote control unit, the functions of both				- / + : OPERATE		DISP : EXIT
	units are the same So please use the attached diagram for the RM-C90
	remote control unit for the RM-C364GY & RM-C364.				SYSTEM CONSTANT-
	By the way, MENU -/+ Key functions in the same manner as for			/ key.
					SYSTEMCONSTANT SET			3
	KEY ASSIGNMENT OF REMOTE CONTROL UNIT				AMPTUNER		: NO
					VNR		: YES
					TEXT TABLE		: CYL
					VOLUM PWM		: POS
					/	: SELECT
	DISPLAY key		MENU		- / + : OPERATE		DISP : EXIT
			▼/▲ key
	MENU
	/	key
						Fig.2

NUMBERS

PICTURE			key
MODE key

(RM-C90)

10

No. 52024