JVC GR-AXM236U

4. CHARTS AND DIAGRAMS
NOTES OF SCHEMATIC DIAGRAM .......................................... 4-1
CIRCUIT BOARD NOTES ........................................................... 4-2
4.1 BOARD INTERCONNECTIONS .......................................... 4-3
4.2 CPU SCHEMATIC DIAGRAM .............................................. 4-5
4.3 M. MDA SCHEMATIC DIAGRAM ......................................... 4-7
4.4 VTR ASP SCHEMATIC DIAGRAM ....................................... 4-9
4.5 DSP SCHEMATIC DIAGRAM ............................................. 4-11
4.6 F/Z/I/MDA SCHEMATIC DIAGRAM .................................... 4-13
4.7 V OUT SCHEMATIC DIAGRAM ......................................... 4-15
4.8 TG/CDS SCHEMATIC DIAGRAM ...................................... 4-17
4.9 REG SCHEMATIC DIAGRAM ............................................ 4-19
4.10 LCD/CVF SCHEMATIC DIAGRAM .................................. 4-21
4.11 BW/CVF SCHEMATIC DIAGRAM ................................... 4-23
4.12 JACK SCHEMATIC DIAGRAM ........................................ 4-25
4.13 SPEAKER SCHEMATIC DIAGRAM ................................ 4-27
4.14 CCD SCHEMATIC DIAGRAM .......................................... 4-28
4.15 MONITOR SCHEMATIC DIAGRAM................................. 4-29
4.16 E. VF SCHEMATIC DIAGRAM ......................................... 4-31
4.17 TOP OPE UNIT, ZOOM UNIT, REAR UNIT AND SENSOR
SCHEMATIC DIAGRAMS ................................................ 4-33
4.18 MAIN CIRCUIT BOARD ................................................... 4-35
4.19 MONITOR CIRCUIT BOARD ........................................... 4-41
4.20 CCD CIRCUIT BOARD .................................................... 4-43
4.21 E. VF CIRCUIT BOARD ................................................... 4-44
4.22 WAVEFORMS .................................................................. 4-45
4.23 VOLTAGE CHARTS ......................................................... 4-46
4.24 POWER SYSTEM BLOCK DIAGRAM ............................. 4-51
4.25 CPU/MDA SYSTEM BLOCK DIAGRAM .......................... 4-53
4.26 CAMERA AND Y/C SYSTEM BLOCK DIAGRAM ........... 4-55
4.27 MONITOR SYSTEM BLOCK DIAGRAM ......................... 4-59
5. PARTS LIST
5.1 PACKING AND ACCESSORY ASSEMBLY <M1> ................ 5-1
5.2 FINAL ASSEMBLY <M2> ..................................................... 5-2
5.3 MECHANISM ASSEMBLY <M3> ......................................... 5-6
5.4 ELECTRONIC VIEWFINDER ASSEMBLY <M4> ................. 5-8
5.5 MONITOR ASSEMBLY <M5> [GR-SXM340U] .................... 5-9
5.5 MONITOR ASSEMBLY <M5> [GR-SXM740U] .................. 5-10
5.6 ELECTRICAL PARTS LIST ................................................ 5-11
MAIN BOARD ASSEMBLY <01> ............................................. 5-11
CCD BOARD ASSEMBLY <02> .............................................. 5-17
MONITOR BOARD ASSEMBLY <07> ..................................... 5-17
ELECTRONIC VIEWFINDER BOARD ASSEMBLY <60> ....... 5-18
Important Safety Precautions
INSTRUCTIONS
1. DISASSEMBLY
1.1 SERVICE CAUTIONS .......................................................... 1-1
1.1.1 Precautions ..................................................................... 1-1
1.1.2 How to read the disassembly and assembly ................... 1-1
1.1.3 Connection of the wires ................................................... 1-1
1.2 TOOLS REQUIRED FOR ADJUSTMENTS ......................... 1-2
1.3 DISASSEMBLY/ASSEMBLY OF CABINET PARTS .............. 1-3
1.3.1 Disassembly flow chart .................................................... 1-3
1.3.2 Disassembly method ....................................................... 1-4
1.4 DISASSEMBLY/ASSEMBLY OF CAMERA SECTION AND
DECK SECTION ................................................................ 1-10
1.4.1 Flowchart of disassembly .............................................. 1-10
1.4.2 Disassembly method ..................................................... 1-10
1.5 REPLACEMENT OF CCD IMAGE SENSOR ..................... 1-12
1.5.1 Removal of CCD image sensor ..................................... 1-12
1.5.2 Installation of new CCD image sensor .......................... 1-12
1.5.3 Replacement of CCD board assy .................................. 1-12
1.6 TAKE OUT CASSETTE TAPE ............................................ 1-13
1.7 EMERGENCY DISPLAY .................................................... 1-14
1.8 DEMONSTRATION MODE ................................................ 1-14
1.9 SERVICE NOTE ................................................................. 1-16
2. MECHANISM ADJUSTMENT
2.1 SERVICE CAUTIONS ............................................................ 2-1
2.1.1 Precautions ..................................................................... 2-1
2.1.2 How to read the disassembly and assembly
(For Mechanism Parts) .................................................... 2-1
2.2 DISASSEMBLY/ASSEMBLY OF MECHANISM PARTS ....... 2-2
2.3 CHECKUP AND ADJUSTMENT OF MECHANISM PHASE 2-6
2.4 TAPE TRANSPORT ADJUSTMENT .................................... 2-7
2.4.1 Back tension .................................................................... 2-7
2.4.2 Tape pattern .................................................................... 2-7
2.4.3 A/C head height & azimuth .............................................. 2-8
2.4.4 Phase of control head (X value) ...................................... 2-9
2.5 REMARKS ............................................................................ 2-9
2.5.1 Cleaning .......................................................................... 2-9
2.5.2 Applying oil and grease ................................................... 2-9
2.5.3 Checkup .......................................................................... 2-9
2.6 JIG CONNECTOR CABLE CONNECTION ........................ 2-10
3. ELECTRICAL ADJUSTMENT
3.1 ELECTRICAL ADJUSTMENT .............................................. 3-1
3.1.1 PREPARATION................................................................ 3-1
3.2 ELECTRONIC VIEWFINDER (E. VF) ADJUSTMENT .......... 3-2
3.2.1 Tilt .................................................................................... 3-2
3.2.2 Centering ......................................................................... 3-2
3.2.3 Vertical scanning ............................................................. 3-2
3.2.4 Brightness ....................................................................... 3-2
3.2.5 Focus ............................................................................... 3-2
TABLE OF CONTENTS
Section Title Page Section Title Page
GR-SXM340U GR-SXM740U
BODY COLOR METALLIC GRAY SLIVER
LCD MONITOR 2.5” 3.5”
PB ZOOM FUNCTION NOT USED USED
A DUBBING FUNCTION NOT USED USED
V INSERT FUNCTION NOT USED USED
The following table lists the differing points between Models GR-SXM340U and GR-SXM740U in this serise.