JVC AV-27320/S/R, AV-27330/S/R, AV-27S33/S/R Service Manual

AV-27320

AV-27330

AV-27S33

SERVICE MANUAL

COLOR TELEVISION

AV-27320/S/R

AV-27330/S/R

AV-27S33/S/R

BASIC CHASSIS

FE

[RM-C205] [RM-C255]

AV-27320 AV-27330 AV-27S33

CONTENTS

!SPECIFICATIONS 2

!SAFETY PRECAUTIONS 3

!FEATURES 4

!HOW TO IDENTIFY MODELS 4

!MAIN DIFFERENCE LIST 5

!FUNCTIONS 6

!SPECIFIC SERVICE INSTRUCTIONS 8

!SERVICE ADJUSTMENTS 12

!PARTS LIST 31

OPERATING INSTRUCTIONS

STANDARD CIRCUIT DIAGRAM 2-1

1

COPYRIGHT © 2002 VICTOR COMPANY OF JAPAN, LTD.

No.51937

May. 2002

May 2002

AV-27320

AV-27330

AV-27S33

SPECIFICATIONS

				Contents
Items
		AV-27320/S		AV-27330/S	AV-27S33/S
		AV-27320/R		AV-27330/R	AV-27S33/R
Dimensions (W×H×D)		25-3/4”×23”-3/8”×19-1/2” (654mm×593mm×494mm)
Mass		68.5 Ibs (31.1 kg)
TV System and Color System
	TV RF System	CCIR(M)
	Color System	NTSC
	Sound System	BTSC System (Multi-Channel Sound)
TV Receiving Channels and Frequency
	VL Band	(02 06) 54MHz 88MHz
	VH Band	(07 13) 174MHz 216MHz
	UHF Band	(14 69) 470MHz 806MHz
CATV Receiving Channels and Frequency
	Low Band	(02 06, A-8) by (02 06&01)
	High Band	(07 13) by (07 13)
	Mid Band	(A 1) by (14 22)		(54MHz 804MHz)
	Super Band	(J W) by (23 36)
	Hyper Band	(W +1 W+28) by (37 64)
	Ultra Band	(W +29 W+84) by (65 125)
	Sub Mid Band	(A8, A4 A1) by (01, 96 99)
TV/CATV Total Channel		181 Channels
Intermediate Frequency
	Video IF Carrier	45.75MHz
	Sound IF Carrier	41.25MHz (4.5MHz)
Color Sub Carrier		3.58MHz
Power Input		120V AC, 60Hz
Power Consumption		113W
Picture Tube		27” (68cm) Measured Diagonally
High Voltage		28.0kV±1.3kV (at zero beam current)
Speaker		2“×3-1/2” (5×9cm) Oval type×2
Au dio Power Output		1.2W + 1.2W
Input terminals
Input 1	S-Video	Y: 1Vp-p Positive (negative sync provided, when terminated with 75Ω)
		C: 0.286Vp-p (burst signal, when terminated with 75Ω)
	Video(V)	1Vp-p, 75Ω (RCA pin jack) [AV-27330/S,R AV-27S33/S,R]
Comp onent (V/Y, PB, PR)		1Vp-p 75Ω(positive sync) [AV-27320/S,R]
	Au dio (L, R)	500mVrms ( -4dBs ), High Impedance (RCA pin jack)
Input 2	Video(V)	1Vp-p, 75Ω (RCA pin jack) [AV-27320/S,R]
	Au dio (L, R)	500mVrms ( -4dBs ), High Impedance (RCA pin jack) [AV-27320/S,R]
Component (V/Y, PB, PR)		1Vp-p 75Ω(positive sync) [AV-27330/S,R AV-27S33/S,R]
	Audio(L, R)	500mVrms ( -4dBs ), High Impedance (RCA pin jack) [AV-27330/S,R AV-27S33/S,R]
Input 3	Video(V)	1Vp-p, 75Ω (RCA pin jack) [AV-27330/S,R AV-27S33/S,R]
(Front)	Au dio (L, R)	500mVrms ( -4dBs ), High Impedance (RCA pin jack) [AV-27330/S,R AV-27S33/S,R]
Output terminals
Variable Audio Output (R/L)		More than 0 1550mVrms (+6dBs)
		Low impedance (400Hz when modulated 100%) (RCA pin jack)
An ten na terminal		75Ω(VHF/UHF) Terminal, F-T ype Connector
Remote Control Unit		RM-C205 (AA/R6/UM-3 battery×2) [AV-27320/S,R]
		RM-C255 (AA/R6/UM-3 battery×2) [AV-27330/S,R AV-27S33/S,R]

Design & specifications are subject to change without notice.

2

No.51937

AV-27320

AV-27330

AV-27S33

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. These 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 such 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. Use isolation transformer when hot chassis.

The chassis and any sub-chassis contained in some products are connected to one side of the AC power line. An isolation transformer of adequate capacity should be inserted between the product and the AC power supply point while performing

any service on some products when the HOT chassis is exposed.

5. Do n'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 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. 6. 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).

7. 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.). T o 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.

8. 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.

9. 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.

10.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 1100V 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,
GOOD	OR MOR E SENSITIVITY)
EARTH
GR OUND 0.15μF AC-TYPE
	PLACE THIS PROBE
	ON EACH EXPOSED
1500Ω 10W	METAL PART

11.High voltage hold down circuit check.

After repair of the high voltage hold down circuit, this circuit shall be checked to operate correctly.

See item "Ho w to check the high voltage hold down circuit".

This mark shows a fast

operating fuse, the letters indicated below

show the rating.

A V

No. 51937

3

AV-27320

AV-27330

AV-27S33

FEATURES

"New chassis design enables use of a single board with simplified circuitry.

"Users can make fun to connect the Digital Video Disk player with the component video signal input terminal.

"Provided with miniature tuner (TV/CATV).

"Multifunctional remote control permits picture adjustment.

"Adoption of the CHANNEL GUARD function prevents the specific channels from being selected, unless the “ID number” is key in.

"I2C bus control utilizes single chip ICs.

"Adoption of the VIDEO STATUS function.

"Adoption of the ON/OFF TIMER function.

"Built-in V-CHIP system.

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

"SLEEP TIMER for setting in real time.

"Closed-caption broadcasts can be viewed.

"Built-in MTS system.

"Built-in HYPER-SURROUND system.

"S-VIDEO input terminal for taking best advantage of Super VHS.

"Variable Audio output terminal.

"3 LINE Digital Comb filter Improved picture quality.

HOW TO IDENTIFY MODELS

The difference between AV-27320/S and AV-27320/R is in the PICTURE TUBE. As the result of the difference in picture tube, the MAIN PW B also differs.

In the same way, the difference between 27330/S and AV-27330/R,27S33/S and 27S33/R is in the PICTURE TUBE too.

MODEL	AV-27320/S	AV-27320/R
!	AV-27330/S	AV-27330/R
Parts name	AV-27S33/S	AV-27S33/R
! RATING LABEL	LC31139-001A-A	←
	Indicated AV-27230	Indicated AV-27230
	or AV-27330	or AV-27330
	or AV-27S33	or AV-27S33

Indicated “S”

Indicated “R”

4

No.51937

AV-27320

AV-27330

AV-27S33

MAIN DIFFERENCE LIST

!	Model name	AV-27320/S	AV-27320/R
	Parts Name
	MAIN PWB	SFE-1006A-M2	SFE-1007A-M2
!	ITC TUBE	A68QDN891X001	A68ADT25X01
!	POW ER KNOB	LC30376-001A-A
!	PUSH KNOB	LC30271-001A-A
!	REAR COVER	LC10082-004A-A
!	FRONT CABINET	LC10081-005B-A
	JVC MARK	CM48006-006-C
	REMOTE CONTROL UNIT	RM-C205-1C
	Model name	AV-27330/S	AV-27330/R
!

Parts Name

	MAIN PWB	SFE-1004A-M2	SFE-1005A-M2
!	ITC TUBE	A68QDN891X001	A68ADT25X01
!	POW ER KNOB	LC30376-001A-A
!	PUSH KNOB	LC30271-001A-A
!	REAR COVER	LC10082-003A-A
!	FRONT CABINET	LC10081-004B-A
	JVC MARK	CM48006-006-C
	REMOTE CONTROL UNIT	RM-C255-1H

!	Model name	AV-27S33/S	AV-27S33/R
	Parts Name
	MAIN PWB	SFE-1004A-M2	SFE-1005A-M2
!	ITC TUBE	A68QDN891X001	A68ADT25X01
!	POW ER KNOB	LC30376-004A-A
!	PUSH KNOB	LC30271-004A-A
!	REAR COVER	LC10082-003A-A
!	FRONT CABINET	LC10081-008A-A
	JVC MARK	CM48006-007-C
	REMOTE CONTROL UNIT	RM-C255-1H

No.51937

5

AV-27320

AV-27330

AV-27S33

FUNCTIONS

■FRONT PANEL CONTROL

2

1

3

4

5

6

7

8

1	INPUT2 VIDEO terminal [AV-27320/S,R]	5	CHANNEL -/+ buttons
	INPUT3 VIDEO terminal [AV-27330/S,R AV-27S33/S,R]		OPERATE / buttons
2	INPUT2 AUDIO L MONO terminal [AV-27320/S,R]	6	VOLUME -/+ buttons
	INPUT3 AUDIO L MONO terminal [AV-27330/S,R AV-27S33/S,R]
3	INPUT2 AUDIO R terminal [AV-27320/S,R]	7	ON TIMER LED
	INPUT3 AUDIO R terminal [AV-27330/S,R AV-27S33/S,R]
4	MENU button	8	POW ER button

■

REAR TERMINAL

[

AV-27320/S,R]

[ AV-27330/S,R AV-27S33/S,R]

1

2

3

1 AUDIO OUTPUT (L, R)terminals

2 INPUT1 (S,V/Y, PR, PB, L, R) terminals

3 VHF / UHF terminal

1

2

3

4

1AUDIO OUTPUT (L, R)terminals

2INPUT1 (S, V, L, R) terminals

3INPUT2 (V/Y, PR, PB, L, R) terminals

4 VHF / UHF terminal

6

No.51937

■REMOTE CONTROL UNIT

[RM-C205] AV-27320/S,R

	11
1	5
2	6
	7
3	8
	9
4	10
	12

[RM-C255] AV-27330/S,R AV-27S33/S,R

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

AV-27320

AV-27330

AV-27S33

1VIDEO STATUS key

2DISPLAY key

3MUTING key

4MENU key

5POWER key

6INPUT key

7CHANNEL keys

8V-CHIP key

9FUNCTION ( ▼/ ▲, / ) Keys

10 EXIT key

11 SLEEP TIMER key

12 VCR CONTROL keys

1INPUT key

2DISPLAY key

3SLEEP TIMER key

4HYPER SUR. key

5VIDEO STATUS key

6MUTING key

7 FUNCTION (VOL-/+, / )keys

8MENU key

9POWER key

10CHANNEL keys

11V-CHIP key

12 FUNCTION (CH-/+, ▼/ ▲) keys

13EXIT / PIP OFF key

14VCR CONTROL keys

15 VCR / DVD switch

16 TV / CATV switch

The CH-/+ and VOL-/+ keys operate CHANNEL and VOLUME normally.

These keys are also used to navigate MENU system.

No.51937

7

AV-27320

AV-27330

AV-27S33

SPECIFIC SERVICE INSTRUCTIONS

DISASSEMBLY PROCEDURE

REMOVING THE REAR COVER

1.Disconnect the power plug from wall outlet.

2.As shown in the Fig.1, remove the 7 screws marked !.

[For AV-27320/S,R]

3.As shown in Fig.1, remove the 3 screws marked ".

[For AV-27330/S,R AV-27S33/S,R]

3.As shown in Fig.1, remove the 4 screws marked ".

4.Then remove the REAR COVER toward you.

REMOVING THE MAIN PWB

" After removing the REAR COVER.

1.Pick this side of the MAIN PWB and raise one slightly, take off the PWB stopper marked #from the cabinet bottom.

2.Withdraw the chassis backward.

(If necessary, remove the wire clamp, connectors etc.)

REMOVING THE SPEAKER

"After removing the rear cover.

1.As shown in Fig. 1, removing the screws marked $, then remove the speaker.

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

NOTE : When removing the screws marked $ of the speaker, remove the lower side screw first, and then remove the upper one.

CHECKING THE PW BOARD

To check the PW Board from back side.

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

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

CAUTION

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

"Before turning on power, make sure that the wire connector is properly connected.

"When conducting a check with power supplied, be sure to confirm that the CRT EART H WIRE (BRAIDED ASS’Y) is connected to the CRT SOCKET PW board.

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.51937

AV-27320

AV-27330

AV-27S33

			This exploded view describes about the
			AV-27330/S,R and AV-27S33/S,R.
			Although the AV-27320/S,R is slightly
			different from this figure, you can use the
	FRONT CABINET	CRT
			exploded view for disassembling the AV-
			27320/S,R in the same step as for this
			one.

CRT SOCKET PWB

SPEAKER

MAIN PWB

$	HVT

SPEAKER

$

REAR COVER

#

PWB STOPPER

"

!

POWER CORD

Fig.1

No.51937

9