JVC SR-VS30U

TABLE OF CONTENTS
Section Title Page Section Title Page
Important Safety Precautions
INSTRUCTIONS
1. DISASSEMBLY
1.1 HOW TO REMOVE THE MAJOR PARTS ........................................1-1
1.1.1 Introduction ..................................................................................1-1
1.2 HOW TO READ THE DISASSEMBLY AND ASSEMBLY .................. 1-1
1.3 DISCONNECTION OF CONNECTORS (WIRES) ............................1-1
1.4 HOW TO REMOVE THE MAJOR PARTS <COM section> ..............1-2
1.4.1 Disassembly flow chart ................................................................ 1-2
1.4.2 Disassembly/assembly method <COM section> .........................1-2
1.5 HOW TO REMOVE THE MAJOR PARTS <VHS section> ...............1-4
1.5.1 Disassembly flow chart ................................................................ 1-4
1.5.2 DIsassembly/assembly method <VHS section> .......................... 1-4
1.6 HOW TO REMOVE THE MAJOR PARTS <DV section>..................1-6
1.6.1 Disassembly flow chart ................................................................ 1-6
1.6.2 Disassembly/assembly method <DV section> ............................. 1-6
1.7 CONNECTION ..................................................................................1-8
1.8 SERVICE POSITIONS....................................................................1-10
1.8.1 Requirement PATCH CORDS ....................................................1-10
1.8.2 Service position <VHS SIDE>....................................................1-10
1.8.3 Service position <DV FOIL SIDE> ............................................. 1-10
1.8.4 Service position <DV COMPONENT SIDE>.............................. 1-11
1.9 Jig RCU mode................................................................................. 1-11
1.9.1 Setting the Jig RCU mode ......................................................... 1-11
1.9.2 Setting the User RCU mode ...................................................... 1-11
1.10 MECHANISM SERVICE MODE ...................................................1-12
1.10.1 How to set the “MECHANISM SERVICE MODE” ....................1-12
1.11 EMERGENCY DISPLAY FUNCTION............................................1-13
1.11.1 Displaying the emergency information .....................................1-13
1.11.2 Clearing the emergency history ............................................... 1-13
1.11.3 Emergency content description ................................................1-14
1.11.4 Emergency detail information <1> ........................................... 1-15
1.11.5 Emergency detail information <2> ........................................... 1-16
2. MECHANISM ADJUSTMENT (VHS)
2.1 BEFORE STARTING REPAIR AND ADJUSTMENT .........................2-1
2.1.1 Precautions ..................................................................................2-1
2.1.2 Checking for Proper Mechanical Operations ............................... 2-1
2.1.3 Manually Removing the Cassette Tape .......................................2-1
2.1.4 Jigs and Tools Required for Adjustment....................................... 2-2
2.1.5 Maintenance and Inspection ........................................................2-3
2.2 REPLACEMENT OF MAJOR PARTS ...............................................2-6
2.2.1 Before Starting Disassembling
(Phase matching between mechanical parts) ............................... 2-6
2.2.2 How to Set the Mechanism Assembling Mode .............................2-6
2.2.3 Cassette Holder Assembly ...........................................................2-6
2.2.4 Pinch Roller Arm Assembly ..........................................................2-8
2.2.5 Guide Arm Assembly and Press Lever Assembly ........................2-8
2.2.6 Audio Control Head ......................................................................2-8
2.2.7 Loading Motor ..............................................................................2-8
2.2.8 Capstan Motor .............................................................................2-9
2.2.9 Pole Base Assembly (supply or take-up side) ..............................2-9
2.2.10 Rotary Encoder ........................................................................2-10
2.2.11 Clutch Unit ................................................................................2-10
2.2.12 Change Lever Assembly, Direct Gear, Clutch Gear
and Coupling Gear....................................................................2-10
2.2.13 Link Lever ................................................................................ 2-11
2.2.14 Cassette Gear, Control Cam and Worm Gear ......................... 2-11
2.2.15 Control Plate ............................................................................ 2-11
2.2.16 Loading Arm Gear (supply or take-up side)
and Loading Arm Gear Shaft ....................................................2-12
2.2.17
Take-up Lever, Take-up Head and Control Plate Guide .................. 2-13
2.2.18 Capstan Brake Assembly .........................................................2-13
2.2.19 Sub Brake Assembly (take-up side) .........................................2-13
2.2.20 Main Brake Assembly (take-up side),
Reel Disk (take-up side)
and Main Brake Assembly (supply side) ...................................2-13
2.2.21 Tension Brake Assembly, Reel Disk (supply side)
and Tension Arm Assembly .......................................................2-14
2.2.22 Idler Lever, Idler Arm Assembly ...............................................2-14
2.2.23 Stator Assembly .......................................................................2-14
2.2.24 Rotor Assembly ........................................................................2-14
2.2.25 Upper Drum Assembly .............................................................2-15
2.3 COMPATIBILITY ADJUSTMENT ..................................................2-16
2.3.1 Checking/Adjustment of FM Waveform Linearity .......................2-16
2.3.2
Checking/Adjustment of the Height and Tilt of the Audio Control Head .................... 2-17
2.3.3
Checking/Adjustment of the Audio Control Head Phase (X-Value) ............... 2-17
2.3.4 Checking/Adjustment of the Standard Tracking Preset ............. 2-18
2.3.5 Checking/Adjustment of the Tension Pole Position ....................2-18
MECHANISM ADJUSTMENT (DV)
2.4 PREPARATION ...............................................................................2-20
2.4.1 Precautions ................................................................................2-20
2.4.2 Tools Required for Adjustments .................................................2-20
2.4.3 Disassembly and Assembly Procedures ....................................2-20
2.4.4 Screws and Washers Used in Disassembly/
Assembly of the Mechanism Assembly...................................... 2-20
2.5
DISASSEMBLY/ASSEMBLY OF THE MECHANISM ASSEMBLY ................... 2-21
2.5.1 Introduction ................................................................................2-21
2.5.2 Mechanism Modes .....................................................................2-21
2.6 MECHANISM TIMING CHART .......................................................2-23
2.7
MECHANISM ASSEMBLY/DISASSEMBLY PROCEDURE TABLE .................. 2-24
2.8 DISASSEMBLY/ASSEMBLY ...........................................................2-26
2.9 LIST OF PROCEDURES FOR DISASSEMBLY .............................2-34
2.10 MECHANISM PHASE CHECK/ADJUSTMENT ............................2-35
2.11 MECHANISM DISASSEMBLY/ASSEMBLY SHEET ..................... 2-36
2.12 POSITIONING THE TENSION POLE ...........................................2-38
2.13
COMPATIBILITY AND ERROR RATE ADJUSTMENTS ................. 2-39
2.13.1 Preparation ..............................................................................2-39
2.13.2 Adjustment ...............................................................................2-39
2.13.3 Linearity adjustment ................................................................. 2-40
2.13.4 PB switching point adjustment .................................................2-40
2.13.5 Error rate adjustment ...............................................................2-40
2.13.6 Error rate measuring method ...................................................2-40
2.14 TAPE EJECTION ..........................................................................2-41
3. ELECTRICAL ADJUSTMENT (VHS)
3.1 PRECAUTION ..................................................................................3-1
3.1.1 Required test equipments ............................................................3-1
3.1.2 Required adjustment tools ...........................................................3-1
3.1.3 Color (colour) bar signal,Color (colour) bar pattern ..................... 3-1
3.1.4 Switch settings and standard precautions ................................... 3-1
3.1.5 EVR Adjustment ...........................................................................3-1
3.2 SERVO CIRCUIT ..............................................................................3-2
3.2.1 Switching point ............................................................................. 3-2
3.2.2 Slow tracking preset.....................................................................3-2
3.3 VIDEO CIRCUIT ...............................................................................3-2
3.3.1 D/A level .......................................................................................3-2
3.3.2 EE Y/PB Y (S-VHS/VHS) level.....................................................3-2
3.3.3 REC color (colour) level ...............................................................3-3
3.3.5 Video EQ (Frequency response) .................................................3-3
3.3.6 AUTO PICTURE initial setting ......................................................3-4
3.3.6 DV EE Y level...............................................................................3-4
3.4 AUDIO CIRCUIT ...............................................................................3-4
3.4.1 Audio REC FM .............................................................................3-4
3.5 DEMODULATOR CIRCUIT ...............................................................3-5
3.5.1 Input level.....................................................................................3-5
3.5.2 Stereo VCO..................................................................................3-5
3.5.3 Stereo filter...................................................................................3-5
3.5.4 Separation-1 ................................................................................3-5
3.5.5 Separation-2 ................................................................................3-6
3.5.6 SAP VCO .....................................................................................3-6
ELECTRICAL ADJUSTMENT (DV)
3.6 PREPARATION .................................................................................3-7
3.6.1 Precautions ..................................................................................3-7
3.6.2 Equipment required for adjustment .............................................. 3-7
3.6.3 Tools required for adjustments .....................................................3-7
3.6.4 Setup............................................................................................3-7
4. CHARTS AND DIAGRAMS
NOTES OF SCHEMATIC DIAGRAM ..................................................... 4-1
CIRCUIT BOARD NOTES ......................................................................4-2
4.1 BOARD INTERCONNECTIONS .......................................................4-3
4.2
SWITCHING REGULATOR SCHEMATIC DIAGRAM[HR-DVS3U/SR-VS30U] .. 4-5
4.3 MAIN (VIDEO/AUDIO) SCHEMATIC DIAGRAM ..............................4-7
4.4 MAIN (VHS SYSCON) SCHEMATIC DIAGRAM ..............................4-9
4.5 MAIN (TUNER) SCHEMATIC DIAGRAM ....................................... 4-11
4.6 MAIN (VIDEO I/O & SUB EMPHA) SCHEMATIC DIAGRAM .........4-13
4.7 MAIN (AUDIO I/O) SCHEMATIC DIAGRAM ...................................4-15
4.8 MAIN (CONNECTION) SCHEMATIC DIAGRAM ............................4-17
4.9 3D DIGITAL/2M SCHEMATIC DIAGRAM .......................................4-19
4.10 TERMINAL (S-SUB) SCHEMATIC DIAGRAM ..............................4-21
4.11 TERMINAL (I/O) SCHEMATIC DIAGRAM .................................... 4-23
4.12
DEMODULATOR SCHEMATIC DIAGRAM[HR-DVS3U/SR-VS30U] .. 4-25
4.13
POWER SW, SW/DISPLAY AND JOG SCHEMATIC DIAGRAMS .... 4-27
4.14 DV MSD SCHEMATIC DIAGRAM ................................................4-29
4.15 DV MAIN SCHEMATIC DIAGRAM ...............................................4-31
4.16 DV I/O SCHEMATIC DIAGRAM ...................................................4-33
4.17 DV V OUT SCHEMATIC DIAGRAM .............................................4-35
4.18 DV PRE/REC SCHEMATIC DIAGRAM ........................................4-37
4.19 DV REG SCHEMATIC DIAGRAM ................................................ 4-38
4.20 DV AUDIO AD/DA SCHEMATIC DIAGRAM ................................. 4-39
4.21 MAIN(ON SCREEN) SCHEMATIC DIAGRAM ............................. 4-40
4.22 SWITCHING REGULATOR CIRCUIT BOARD .............................4-41
4.23 MAIN CIRCUIT BOARD ................................................................ 4-43
4.24 3D DIGITAL/2M CIRCUIT BOARD ...............................................4-46
4.25
DEMODULATOR, POWER SW, SW/DISPLAY AND JOG CIRCUIT BOARDS .... 4-47
4.26 TERMINAL CIRCUIT BOARD .......................................................4-49
4.27 DV MAIN CIRCUIT BOARD ..........................................................4-51
4.28 REMOTE CONTROL SCHEMATIC DIAGRAM ............................4-53
4.29 WAVEFORMS ...............................................................................4-54
4.30 VOLTAGE CHARTS ......................................................................4-55
4.31 FDP GRID ASSIGNMENT AND ANODE CONNECTION ............. 4-57
4.32 CPU PIN FUNCTION ....................................................................4-58
4.33 SYSTEM CONTROL BLOCK DIAGRAM (VHS) ...........................4-59
4.34 VIDEO BLOCK DIAGRAM(VHS) ..................................................4-61
4.35 AUDIO BLOCK DIAGRAM (VHS) .................................................4-65
4.36 SYSTEM CONTROL BLOCK DIAGRAM (DV) .............................4-67
4.37 VIDEO BLOCK DIAGRAM (DV) ...................................................4-69
5. PARTS LIST
5.1 PACKING AND ACCESSORY ASSEMBLY <M1> ............................ 5-1
5.2 FINAL ASSEMBLY <M2> ..................................................................5-2
5.3 MECHANISM ASSEMBLY (VHS) <M3> ........................................... 5-4
5.4 MECHANISM ASSEMBLY (DV) <M4>..............................................5-6
5.5 ELECTRICAL PARTS LIST ............................................................... 5-8
SW REGULATOR BOARD ASSEMBLY <01> ........................................5-8
MAIN BOARD ASSEMBLY <03> ............................................................5-9
3D DIGITAL/2M BOARD ASSEMBLY <05> ..........................................5-17
TERMINAL BOARD ASSEMBLY <06> .................................................5-18
A/C HEAD BOARD ASSEMBLY <12> .................................................. 5-19
DEMOD BOARD ASSEMBLY <14> ...................................................... 5-19
POWER BOARD ASSEMBLY <27>......................................................5-19
SW/DISPLAY BOARD ASSEMBLY <28> ............................................. 5-19
DV MAIN BOARD ASSEMBLY <50> .................................................... 5-20
LOADING MOTOR BOARD ASSEMBLY <55>.....................................5-25
JOG BOARD ASSEMBLY <85> ............................................................5-25