JVC GRAX760U/UC Repair Manual

TABLE OF CONTENTS
SectionTitlePageSectionTitlePage
Important Safety Precautions4.2 CPU SCHEMATIC DIAGRAM .............................................. 4-5
INSTRUCTIONS4.3 VTR ASP SCHEMATIC DIAGRAM ....................................... 4-7
1. DISASSEMBLY4.4 MECHA MDA SCHEMATIC DIAGRAM ................................ 4-9
1.1 SERVICE CAUTIONS ..........................................................4.5 VTR DSP SCHEMATIC DIAGRAM1-1.................................... 4-11
1.1.1 Precautions ..................................................................4.6 DSP SCHEMATIC DIAGRAM.............................................1-14-13
1.1.2 How to read the disassembly and assembly ................4.7 IRIS & AF/ZOOM SCHEMA1-1TIC DIAGRAM ........................ 4-15
1.1.3 Connection of the wires ................................................4.8 VIDEO OUT SCHEMATIC DIAGRAM1-1................................ 4-17
1.2 TOOLS REQUIRED FOR ADJUSTMENTS .........................4.9 REGULA1-2TOR SCHEMATIC DIAGRAM .............................. 4-19
1.3 DISASSEMBLY/ASSEMBLY OF CABINET PARTS .............4.101-3LCD CTL SCHEMATIC DIAGRAM (FOR AX760U/UC) .......4-21
1.3.1 Disassembly flow chart.................................................4.11 LCD CTL SCHEMATIC DIAGRAM (FOR 1-3AX761U,SX860U) ........4-23
1.3.2 Disassembly method ....................................................4.12 JACK AND CCD SCHEMATIC DIAGRAM1-4......................... 4-25
1.4 DISASSEMBLY/ASSEMBLY OF CAMERA SECTION4.13 C-VF BL SENSOR SCHEMATIC DIAGRAM
AND DECK SECTION .......................................................... (FOR AX761U,SX860U) ....................................................1-84-27
1.4.1 Flowchart of disassembly .............................................4.14 TOP OPE UNIT, ZOOM UNIT1-8, REAR UNIT
1.4.2 Disassembly method ....................................................AND SENSOR SCHEMATIC DI1-8AGRAM .............................. 4-29
1.5 REPLACEMENT OF CCD IMAGE SENSOR .....................4.151-10ELECTRONIC VIEWFINDER SCHEMATIC DIAGRAM
1.5.1 Removal of CCD image sensor ..................................(FOR AX760U/UC)1-10............................................................. 4-31
1.5.2 Installation of new CCD image sensor .......................4.16 MAIN CIRCUIT BOARD1-10..................................................... 4-33
1.5.3 Replacement of CCD board assy ...............................4.17 CCD AND C-VF CIRCUIT BOARDS1-10.................................. 4-39
1.6 TAKE OUT CASSETTE TAPE ............................................4.18 ELECTRONIC VIEWFINDER CIRCUIT BOARD1-11............... 4-41
1.7 EMERGENCY DISPLAY.....................................................4.19 POWER SYSTEM BLOCK DIAGRAM1-12............................... 4-43
1.8 DEMONSTRATION MODE ................................................4.20 CPU/MDA SYSTEM BLOCK DIAGRAM1-12............................ 4-45
1.9 SERVICE NOTE .................................................................4.21 CAMERA SYSTEM BLOCK DIAGRAM1-14.............................. 4-47
4.22 Y/C SYSTEM BLOCK DIAGRAM ....................................... 4-51
2. MECHANISM ADJUSTMENT4.23 MONITOR SYSTEM BLOCK DIAGRAM ............................ 4-53
2.1 Required adjustment tools......................................................4.24 WAVEFORMS ....................................................................2-14-55
4.25 VOLTAGE CHARTS ........................................................... 4-56
3. ELECTRICAL ADJUSTMENT
3.1 ELECTRICAL ADJUSTMENT...............................................5. PARTS LIST3-1
3.1.1 PREPARATION ............................................................5.1 PACKING AND ACCESSORY ASSEMBL3-1Y <M1> ................ 5-1
3.2 ELECTRONIC VIEWFINDER (E.VF) ADJUSTMENT ..........5.23-3FINAL ASSEMBLY <M2> ..................................................... 5-3
3.2.1 Tilt.................................................................................5.3 MECHANISM ASSEMBLY <M3>..........................................3-35-6
3.2.2 Centering ......................................................................5.4 ELECTRONIC VIEWFINDER ASSEMBLY <M4>3-3................. 5-8
3.2.3 Vertical Scanning .........................................................5.5 ELECTRICAL PARTS LIST ................................................3-35-10
3.2.4 Brightness ....................................................................MAIN BOARD ASSEMBLY <01> ........................................3-35-10
3.2.5 Foucs............................................................................CCD BOARD ASSEMBLY <02> .........................................3-35-16
C-VF BL BOARD ASSEMBLY <06> ................................... 5-16
4. CHARTS AND DIAGRAMS
NOTES OF SCHEMATIC DIAGRAM ................................... 4-1
CIRCUIT BOARD NOTES .................................................... 4-2
4.1 BOARD INTERCONNECTIONS .......................................... 4-3
The following table lists the differing points between Models GR-AX760U/UC and GR-AX761U,GR-SX860U in this series.
GR-AX760UGR-AX760UCGR-AX761UGR-SX860U
VIDEO LIGHTNOT USEDUSEDNOT USED
IR RECEIVERNOT USEDUSEDNOT USED
TAPE FORMATVHS-CS-VHS-C
+
S-VHS ON/OFFNOT USED+USED
S-VHS ETNOT USED+USED
S-VHS ET ON/OFFNOT USED+USED
S OUT PUTNOT USED+USED
LIGHT SWNOT USEDUSEDNOT USED
VIEW FINDERB/WCOLOR+
REMOTE CONTROL UNITNOT USEDUSEDNOT USED
Note: Mark + is same as left.