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SERVICE MANUAL
CONTENTS
! SPECIFICATIONS ･････････････････ ･･････････ ･･･ ･･
･･･････ ･･････････ ･･････････ ･･ ･･･ ･･ ･･･ ･･ ････ ････ ･･ ････ ････ ･･ ･･
･･･････ ･･････････ ･･････････ ･･ ･･･
･･･････ ･･････････ ･･････････ ･･･ ･･
! SAFETY PRECAUTIONS ･･･････ ････････ ･･････ ･･ ････ ･･･ ･･
! FEATURES･･ ･･･ ･･ ･･････････ ････････････ ･･･
･････････ ･･････････ ･････････････
･････････ ･･････････ ･････････････ ･･ ･･･ ･･････ ････ ･･････ ････ ･････ ･･
･･ ･･･ ･･ ･･････････ ････････････ ･･･
! FUNCTIONS ･･･ ･･ ･･････････ ･･････････ ･･･････
･････ ･･････････ ････････ ･･･････････ ･･･ ･･ ････ ････ ･･ ････ ････ ･･ ･･･ ･･
･･･ ･･ ･･････････ ･･････････ ･･･････
･････ ･･････････ ････････ ･････････
! MAIN DIFFERENCE LIST ･･･････ ･･････････ ････ ････ ････ ･･･
! SPECIFIC SERVICE INSTRUCTIONS ･･･････ ････ ････ ････ ･･ ････ ････ ･･･
! SERVICE ADJUSTMENTS ･･･････ ･･････････ ････ ････ ････ ･･･
! PARTS LIST ･････････ ･･････････ ･･････････ ･･･
･･･ ･･･････････････････････････････ ･･･ ････ ･･ ････ ････ ･･ ････ ････ ･･･
･････････ ･･････････ ･･････････ ･･･
･･･ ･････････････････････････････
★ OPERATING INSTRUCTIONS
★ STANDARD CIRCUIT DIAGRAM ･･ ･･･ ･･････････ ･･ ･･ ････ ････ ･･ ･ ･･
1
COLOUR TELEVISION
AV-20N3/AV-20N3
･････････ ････････ ････ ････ ････ ･････ ･･･ ････ ･･ ････ ････ ･･ ･･
･･･････ ････････ ･･････ ･･ ････ ･･･ ･･
･････････ ････････ ････ ････ ････ ･･･
･････････････････････ ･･ ････ ･･･ ･････ ････ ･･ ････ ････ ･･ ････
･･･････ ･･････････ ････ ････ ････ ･･･
･････････････････････ ･･ ････ ･･･ ･･
･･･････････ ･･ ･･ ････ ････ ･･ ････ ･･･
･･･････････ ････ ･･ ････ ････ ･･ ･･･ ･･
･･･････････ ････ ･･ ････ ････ ･･ ･･･ ･････ ････ ････ ･･
･････････････････････ ･･ ････ ･･･ ･･
･････････････････････ ･･ ････ ･･･ ･･ ･･ ･ ･･ ････ ････ ･･ ････ ･･
･･･････ ･･････････ ････ ････ ････ ･･･
･････ ･･････････ ････ ･･ ････ ････ ･････ ･･･ ･･ ････ ････ ･
･････ ･･････････ ････ ･･ ････ ････ ･･･
･････ ･･････････ ･･ ･･ ････ ････ ･･ ･ ･･
CO PYRIGHT © 2002 VICTOR COMPANY OF JAPAN, LTD.
/D
･･･ ･･････ ････ ･･････ ････ ･･････ 2
･･･ ･･････ ････ ･･････ ････ ･･････
･･ ･･･ ･･ ････ ････ ･･ ････ ････ ･･ ･･
･･･ ････ ･･････ ････ ･･････ 3
･･･ ････ ･･････ ････ ･･････
･･ ･･･ ････ ･･ ････ ････ ･･ ･･
･･･ ･･ ････ ････ ･･ ････ ････ ･･ ････ ･･･
･･･ ････ ･･ ････ ････ ･･ ････ ････ ･･ ･ ･･ ･･ ･
･･ ･･･ ･･････ ････ ･･････ ････ ･････ ･･
･･･ ･･ ････ ････ ･･ ････ ････ ･･ ････ ･･･ ･･ ･･ ･･ ･･ 5
･･･ ･･ ････ ････ ･･ ････ ････ ･･ ････ ･･･
･･ ･･･ ･･････ ････ ･･････ ････ ･････ ･･
･･ ･･･ ････ ･･ ････ ････ ･･ ･･ 7
･･･ ････ ･･ ････ ････ ･･ ････
･･ ･･･ ･･ ････ ････ ･･ ････ ･･
･･ ･･･ ･･ ････ ････ ･･ ････ 15
･･ ･･･ ･･ ････ ････ ･･ ････
･･ ･ ･･ ････ ････ ･･ ････ ･･
･･･ ････ ･･ ････ ････ ･･ ････ ････ ･･ ･ ･･ ･ ･ ･ ･ 33
･･･ ････ ････ ･･ ････ ････ ･･ ････ ･･･ ･･
･･ ･･･ ････ ･･ ････ ････ ･･ ････ ････ ･･･
･･･ ････ ･･ ････ ･･･ 2-1
･･･ ････ ･･ ････ ･･･
･･ ･･･ ････ ･･ ････ ･
BASIC CHASSIS
CG
･･･ 4
･･ ･
･･･
･･ ･ ･･ ････ ････ 8
･･ ･･･ ････ ･･ ･･
･･･ ････ ････ ･･
No. 52025
Jun. 2002
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Table of Contents
Related Manuals for JVC AV-20N3
Summary of Contents for JVC AV-20N3
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Page 1: Table Of Contents
AV- 20N3 AV- 20NMG3 AV- 20NMG3B SERVICE MANUAL COLOUR TELEVISION AV-20N3/AV-20N3 BASIC CHASSIS AV-20NMG3/AV-20NMG3B /AV-20NMG3 [ RM-C364GY ] [ RM-C364 ] CONTENTS ! SPECIFICATIONS ･････････････････ ･･････････ ･･･ ･･ ･･･････ ･･････････ ･･････････ ･･ ･･･ ･･ ･･･ ･･ ････ ････ ･･ ････ ････ ･･ ･･... -
Page 2: Av-20Nmg3/Av-20Nmg3B /Av-20Nmg3 /-A
AV-20N3 AV-20NMG3 AV-20NMG3B SPECIFICATIONS CONT ENTS ITEM AV-20NMG3 AV-20N3 AV-20NMG3B AV-20N3 AV-20NMG3 Dimensions(W × H × D) 619mm × 458mm × 488mm Mass 19kg TV RF Syst em B/G, I, D/K B/G, I, D/K,M RF Mode PAL / SECAM PAL / SECAM / NTSC3.58 / NTSC4 .43... -
Page 3: Safety Precautions
AV-20N3 AV-20NMG3 AV-20NMG3B SAFETY PRECAUTIONS 1. The design of this product contains special hardware, many 9. Isolation Check circuits and components specially for safety purposes. For (Safety for Electrical Shock Hazard) continued protection, no changes should be made to the original After re-ass embling the product, always perform an isolation design unless authorized in writing by the manufacturer. -
Page 4: Features
AV-20N3 AV-20NMG3 AV-20NMG3B FEATURES " New chassis design enables us e of an interactive on-screen c ontrol. " Wide range voltage (110V～240V) AC power input. " With AUDIO / VIDEO INPUT & OUTPUT terminal. " MUTING button can reduce the audio level to zero instantly. -
Page 5: Functions
AV-20N3 AV-20NMG3 AV-20NMG3B FUNCTIONS ■ FRONT PANEL MENU buttons CHANNEL － / ＋ buttons VOLUME － / ＋ buttons AI ECO sensor REMOTE CONTROL s ens or ON TIMER lamp POWER lamp MAIN POWER button A/V INPUT terminal HEADPHONE jack ■... -
Page 6: Remote Control Unit
AV-20N3 AV-20NMG3 AV-20NMG3B ■ REMOTE CONTROL UNIT RM-C364GY : AV-20N3 / AV-20N3 / AV-20NMG3 / AV-20NMG3 RM-C364 : AV-20NMG3B ECO SENSOR key SOUND SYSTEM key COLOUR SYSTEM key TV/VIDEO key OFF TIMER key CHANNEL SCAN k ey RETURN＋key DISPLAY key... -
Page 7: Main Difference List
AV-20N3 AV-20NMG3 AV-20NMG3B MAIN DIFFERENCE LIST Part Name Mai n PWB Remote Control Unit Fr ont Cabinet Rating Label Model Name AV-20N3 SCG -1403A-H2 RM-C3 64GY-1H LC1 0438-027A-H LC2 0377-010B-H SCG -1425A-H2 AV-20N3 AV-20NMG3 SCG -1422A-H2 LC1 0438-029A-H AV-20NMG3B RM-C3 64-1H... -
Page 8: Specific Service Instructions
AV-20N3 AV-20NMG3 AV-20NMG3B SPECIFIC SERVICE INSTRUCTIONS DISASSEMBLY PROCEDURE REMOVING THE REAR COVER 1. Unplug the power plug. 2. As shown in figure, remove the screws marked and a " " " " screw marked 3. Withdraw the rear cover toward you. - Page 9 AV-20N3 AV-20NMG3 AV-20NMG3B FRONT CABI. SPEAKER CRT SOCKET (× × × × 2) MAIN PWB SPEAKER (× × × × 2) POWER CORD REAR COVER (× × × × 1) (× × × × 6) No. 52025...
- Page 10 AV-20N3 AV-20NMG3 AV-20NMG3B 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 us e ICs written with the initial values of data.
- Page 11 AV-20N3 AV-20NMG3 AV-20NMG3B SETTING OF SYSTEM CONSTANT SET Setting value Setting item Setting contents AV-20N3 AV-20N3 AV-20NMG3 AV-20NMG3B AV-20NMG3 MULTI. TRIPLE TRIPLE MULTI. COLOUR BILINGUAL TUNER AI ECO SENSOR E/R/A/P E/C/M/I E/C/M/I E/R/A/P LANGUAGE B/B SOUND ～ LOCK COLOUR AUTO...
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Page 12: Initial Setting Value Of Service Menu
AV-20N3 AV-20NMG3 AV-20NMG3B INITIAL SETTING VALUE OF SERVICE MENU Ad justment of the SERVICE MENU is m ade on the basis of the initial setting values ; however, the new setting values which set the screen in its optim um condition may differ from the initial setting. - Page 13 AV-20N3 AV-20NMG3 AV-20NMG3B 5. PRESET The items in the following table, it is no requirem ent for adjustment. If values had changed by the miss operation, set the initial setting values in the following table. Colour System Do Not Adjust...
- Page 14 AV-20N3 AV-20NMG3 AV-20NMG3B REPLACEMENT OF IC301 (IF V/C DECODER) " For the IC301(IF V/C DECODER) of this model, all data are written in the micr o-computer. So, write the data in the micro- computer in accordance with the following procedures before starting adjustment.
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Page 15: Service Adjustments
AV-20N3 AV-20NMG3 AV-20NMG3B SERVICE ADJUSTMENTS BEFORE STARTING SERVICE ADJUSTMENT 1. There ar e 2 way of adjusting this TV: One is with the 6. Never touch any adjustment parts, which ar e not specified REMOTE CONTROL UNIT and the other is the conventional in the list for this adjustment VRs, transfor ms, condenser s, method using adjustment parts and components. - Page 16 AV-20N3 AV-20NMG3 AV-20NMG3B BASIC OPERATION OF SERVICE MENU " The adjustment using SERVICE MENU The following adjus tment items use the SERVICE MENU in the series of the adjustment. The adjustments are made on the bas is of the initial setting values. The adjustment values which adjust the screen to the optimum condition c an be different from the initial setting values.
- Page 17 %･ If it is ON, then you turn the TV power off, when you are turn the TV power on again. The JVC’s logo will be shown about 15 s econds automatically. ② MENU -/+ Key ･･･････ ･･････････ Select Language.
- Page 18 AV-20N3 AV-20NMG3 AV-20NMG3B SERVICE MENU FLOW CHART SERVICE MENU SUB MENU 1. IF VCO (CW) ***.** M Hz SERVICE MENU TOO HIGH ABOVE REFERENCE 1.IF 2.V/C JUST REFERENCE 3.DEF 4.VSM PRESET 1. VCO BELOW REFERENCE 5.PRESET 2. DELAY POINT TOO LOW 6.SETUP TOUR OFF...
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Page 19: Main Pwb
AV-20N3 AV-20NMG3 AV-20NMG3B ADJUSTMENT LOCATIONS CRT SOCKET PWB (SOLDER SIDE) TP-47R/G TP-47G/R TP-47B TP-E CRT EARTH WIRE (BRAIDED ASS'Y) MAIN PWB FRONT F9 01 IC702 IC701 M EM ORY IC IC301 TU 001 1Pin TP-91(B1) UPPER:FOCUS 2Pin NC LOWER:SCREEN 3Pin X-ray1... -
Page 20: Focus Adjustment
AV-20N3 AV-20NMG3 AV-20NMG3B ADJUSTMENTS B1 POWER SUPPLY Measuring Item Test point Ad justment part Description instrument Check of Signal TP-91 ( B1) 1. Input a whole black signal. B1 Power gener ator TP-E (# # # # ) 2. Connect a DC voltmeter to TP-91(B1) and TP-E (#). - Page 21 AV-20N3 AV-20NMG3 AV-20NMG3B Measuring Item Test point Ad justment part Description instrument Signal Ad justment DELAY POINT 1. Input a blac k and white signal (colour off). gener ator of DELAY (AGC TAKE-OVER) 2. Enter the SERVICE MENU. POINT 3. Select 1. IF from the SERVICE MENU.
- Page 22 AV-20N3 AV-20NMG3 AV-20NMG3B VIDEO / CHROMA CIRCUIT ADJUSTMENT The setting (adjustment) usin g the REMOTE CONTROL UNIT is made on the basis of the initial setting values. The setting values which adjust the screen to the optim um condition can be different fr om the initial setting valu es.
- Page 23 AV-20N3 AV-20NMG3 AV-20NMG3B Measuring Item Test point Ad justment part Description instrument Remote Ad justment 3. BRIGHT 1. Receive any broadc ast. control unit 2. Enter the SERVICE MENU. SUB BRIGHT 3. Select 2. V/C from SERVICE MENU. 4. Select 3. BRIGHT with the MENU ▼/▲key.
- Page 24 AV-20N3 AV-20NMG3 AV-20NMG3B Measuring Item Test point Ad justment part Description instrument Ad justment Signal TP-47G/R 5. COLOUR [Method of adjustm ent using measur ing instrument] gener ator of SUB 1. Input a PAL full field colour bar signal (75% white).
- Page 25 AV-20N3 AV-20NMG3 AV-20NMG3B Measuring Item Test point Ad justment part Description instrument Signal Ad justment 6. TINT [Method of adjustm ent without m easuring instrument] gener ator of TINTⅠ Ⅰ Ⅰ Ⅰ Remote NT SC 3.58 T INT 1. Input a NTSC 3.58 full field colour bar signal (75% white).
- Page 26 AV-20N3 AV-20NMG3 AV-20NMG3B Measuring Item Test point Ad justment part Description instrument Remote Ad justment 7.SECAM [Method of adjustment using measur ing instrument] control unit of SECAM BL ADJUST BL ACK 1. Input a SECAM full field c olour bar signal.
- Page 27 AV-20N3 AV-20NMG3 AV-20NMG3B DEFLECTION CIRCUIT ADJUSTMENT " There are 2 modes of adjustment (s etting value) ------ ① 50Hz mode and ② 60Hz mode ----- depending upon the kind of s ignals (vertic al frequency 50Hz / 60Hz). " When adjusted in mode ① , mode ② will be automatically s et.
- Page 28 AV-20N3 AV-20NMG3 AV-20NMG3B Measuring Item Test point Ad justment part Description instrument Signal ● ● ● ● When the vertical linearity been deteriorated Ad justment 4. VER. L IN. gener ator of VER. LIN. 5. VER. SCURVE rem arkably, perform the following steps.
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Page 29: Purity Adjustment
AV-20N3 AV-20NMG3 AV-20NMG3B PURITY / CONVERGENCE ADJUSTMENT PURITY ADJUSTMENT 1. Demagnetize CRT with the demagnetizer. W EDGE DEF LECT ION 2. Loosen the retainer screw of the deflec tion yoke. YOKE 3. Remove the wedges. CR T 4. Input a green raster signal from the signal generator, and turn the screen to green raster. - Page 30 AV-20N3 AV-20NMG3 AV-20NMG3B STATIC CONVERGENCE ADJUSTMENT 1. Input a cross hatch signal. 2. Using 4-pole convergence magnets , overlap the red and blue lines in the center of the screen (Fig.1) and turn them to magenta (red/blue). (F RONT VIEW ) 3.
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Page 31: Replacement Of Chip Component
AV-20N3 AV-20NMG3 AV-20NMG3B REPLACEMENT OF CHIP COMPONENT ! CAUTIONS 1. Avoid heating for more than 3 seconds. 2. Do not rub the electrodes and the resist parts of the pattern. 3. When removing a c hip part, melt the s older adequately. - Page 32 AV-20N3 AV-20NMG3 AV-20NMG3B No.52025...