JVC AV-20N3, AV-20N3/D, AV-20NMG3, AV-20NMG3/-A, AV-20NMG3B

No.52025

V-20N3

V-20NMG3

V-20NMG3B

Contents

Main No. 52025 Jun. 2002 AV-2 0N3/ AV- 20N3 AV-20NMG3/AV-20NMG3B /AV-20NMG3 /-A SERVICE MANUAL COLOUR TELEVISION CG SPECIFICATIONS Design and specifications are subject to change without notice. No.52025 V-20NMG3 3 SAFETY PRECAUTIONS FEATURES SYSTEM BLOCK DIAGRAM IC301 IC702 TU001 FUNCTIONS FRONT PANEL REAR TERMINAL REMO TE CONTRO L UNIT RM-C364GY : AV-20N3 / AV-20N3/D / AV-20NMG3 / AV-20NMG3/-A RM-C364 : AV-20NMG3B MAIN DIFFERENCE LIST SPECIFIC SERVICE INSTRUCTIONS DISASSEMBLY PROCEDURE C B A REPLACEMENT OF MEMORY ICs 1. MEMORY ICs 2. PROCEDURE FO R REPLACING MEMORY IC s Page INITIAL SETTING VALUE OF SERVICE MENU Page REPLACEMENT OF IC301 (IF V/C DEC ODER) SERVICE ADJUSTMENTS BEFORE STARTING SERVICE ADJUSTMENT MEASURING INSTRUMENT AND FIXTURES ADJUSTMENT ITEMS BASIC OPERATION OF SERVICE MENU SERVICE MENU FLO W CHART ADJUSTMENT LOCATIONS CRT SOCKET PWB MAIN PWB No. 52025 V-20N3 ADJUSTMENTS B1 POWER SUPPLY FOCUS ADJUSTME NT IF CIRCUIT ADJUS TMENT Page VIDEO / CHROM A CIRCUIT ADJUSTMENT RGB 9 Page W G ( A ) W (B) Cy Page DEFLECTION CI RCUIT ADJUSTMENT 92% VSM PRESET SETTING Fig.3 PURITY / CONVERGENCE ADJUSTMENT PURITY ADJUST MENT No.52025 STATIC CONVERGENCE ADJU STMENT DYNAMIC C ONVERGENCE ADJU STMENT REPLACEMENT OF CHIP COMPONENT

JVC - page 32

Models: AV-20N3 AV-20N3/D AV-20NMG3 AV-20NMG3/-A AV-20NMG3B