JVC HR-J271MS - Safety First; Safety Precautions

Important Safety Precautions
INSTRUCTIONS
1. DISASSEMBLY
1.1 DISASSEMBLY FLOW CHART ............................................................ 1-1
1.2 HOW TO READ THE DISASSEMBLY AND ASSEMBLY...................... 1-1
1.3 DISASSEMBLY/ASSEMBLY METHOD ................................................ 1-1
1.4 SERVICE POSITION ............................................................................ 1-4
1.4.1 How to take out the Mechanism and Main board assemblies ......... 1-4
1.5 MECHANISM SERVICE MODE ........................................................... 1-5
1.5.1 How to set the "MECHANISM SERVICE MODE" ............................ 1-5
1.6 EMERGENCY DISPLAY FUNCTION ................................................... 1-6
1.6.1 Displaying the emergency information ............................................1-6
1.6.2 Clearing the emergency history ....................................................... 1-6
1.6.3 Emergency content description ....................................................... 1-7
1.6.4 Emergency detail information 1 ...................................................... 1-8
1.6.5 Emergency detail information 2 ...................................................... 1-9
1.7 SYSCON CIRCUIT ............................................................................. 1-10
1.7.1 Syscon CPU pin function (IC3001) [HR-J677MS, HR-J777MS] .... 1-10
2. MECHANISM ADJUSTMENT
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
3. ELECTRICAL ADJUSTMENT
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
TABLE OF CONTENTS
Section Title Page Section Title Page
HR-J271MS HR-J471MS HR-J677MS HR-J777MS
VIDEO HEAD 2 HEAD 4 HEAD (DA4) 4 HEAD (DA4) 4 HEAD (DA4)
HiFi AUDIO NOT USED NOT USED USED USED
HiFi LEVEL METER NOT USED NOT USED USED USED
FRONT VIDEO/AUDIO INPUT(RCA) NOT USED USED USED USED
VCR PLUS+ NOT USED NOT USED NOT USED SHOW VIEW
REMOTE PAUSE NOT USED NOT USED USED USED
STILL/PAUSE/FRAME ADVANCE REDUCED NOISE NOISELESS NOISELESS NOISELESS
The following table lists the differing points between Models (HR-J271MS, HR-J471MS, HR-J677MS, HR-J777MS) in this series.
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 AUTO PICTURE initial setting ......................................................... 3-2
3.4 SYSCON CIRCUIT ............................................................................... 3-3
3.4.1 Timer clock ...................................................................................... 3-3
4. CHARTS AND DIAGRAMS
NOTES OF SCHEMATIC DIAGRAM .......................................................... 4-1
CIRCUIT BOARD NOTES ........................................................................... 4-2
4.1 BOARD INTERCONNECTIONS .......................................................... 4-3
4.2
VIDEO/N.AUDIO SCHEMATIC DIAGRAM [HR-J271MS, HR-J471MS]. 4-5
4.3 SYSTEM CONTROL SCHEMATIC DIAGRAM [HR-J271MS, HR-J471MS] 4-7
4.4 SWITCHING REGULATOR SCHEMATIC DIAGRAM
[HR-J271MS, HR-J471MS] .................................................................. 4-9
4.5 TUNER SCHEMATIC DIAGRAM [HR-J271MS, HR-J471MS] ........... 4-11
4.6 DISPLAY AND MINI FRONT SCHEMATIC DIAGRAMS
[HR-J271MS, HR-J471MS] ................................................................ 4-13
4.7 BS CONNECTION AND LITHIUM BATTERY SCHEMATIC
DIAGRAMS [HR-J271MS, HR-J471MS] ............................................ 4-15
4.8 TERMINAL SCHEMATIC DIAGRAM [HR-J271MS, HR-J471MS] ..... 4-16
4.9 BOARD INTERCONNECTIONS [HR-J677MS, HR-J777MS] ............ 4-17
4.10
VIDEO/AUDIO SCHEMATIC DIAGRAM [HR-J677MS, HR-J777MS] .. 4-19
4.11 ON SCREEN SCHEMATIC DIAGRAM [HR-J677MS, HR-J777MS] 4-21
4.12 SYSTEM CONTROL AND LITHIUM BATTERY SCHEMATIC
DIAGRAMS [HR-J677MS, HR-J777MS] .......................................... 4-23
4.13 SWITCHING REGULATOR SCHEMATIC DIAGRAM
[HR-J677MS, HR-J777MS] .............................................................. 4-25
4.14 TUNER SCHEMATIC DIAGRAM [HR-J677MS, HR-J777MS] ......... 4-27
4.15 DISPLAY AND MINI OPE SCHEMATIC DIAGRAMS
[HR-J677MS, HR-J777MS] .............................................................. 4-29
4.16 TERMINAL AND R.PAUSE SCHEMATIC DIAGRAMS
[HR-J677MS, HR-J777MS] .............................................................. 4-31
4.17 DEMODULATOR SCHEMATIC DIAGRAM [HR-J777MS] ............... 4-33
4.18
MAIN, A/C HEAD, MINI FRONT, LITHIUM BATTERY AND
LOADING MOTOR CIRCUIT BOARDS [HR-J271MS, HR-J471MS] ........
4-37
4.19
MAIN, A/C HEAD, MINI OPE, R.PAUSE, LITHIUM BATTERY AND
LOADING MOTOR CIRCUIT BOARDS [HR-J677MS, HR-J777MS] ...
4-41
4.20 DEMODULATOR CIRCUIT BOARD [HR-J777MS] ......................... 4-43
4.21 FDP GRID ASSIGNMENT AND ANODE CONNECTION ............... 4-44
4.22 REMOTE CONTROL SCHEMATIC DIAGRAM ............................... 4-45
4.23 VOLTAGE CHARTS [HR-J271MS, HR-J471MS] ............................ 4-46
4.24 VOLTAGE CHARTS [HR-J677MS, HR-J777MS] ............................ 4-47
4.25 SYSTEM CONTROL BLOCK DIAGRAM ......................................... 4-49
4.26 VIDEO BLOCK DIAGRAM ............................................................... 4-51
4.27 AUDIO BLOCK DIAGRAM [HR-J271MS, HR-J471MS] ................... 4-53
4.28 AUDIO BLOCK DIAGRAM [HR-J677MS, HR-J777MS] ................... 4-55
5. PARTS LIST
5.1 PACKING AND ACCESSORY ASSEMBLY <M1> ............................... 5-1
5.2 CABINET AND CHASSIS ASSEMBLY <M2> ...................................... 5-2
5.3 MECHANISM ASSEMBLY <M4> ......................................................... 5-4
5.4 ELECTRICAL PARTS LIST .................................................................. 5-6
MAIN BOARD ASSEMBLY(HR-J271MS/J471MS)<03> ........................... 5-6
MAIN BOARD ASSEMBLY(HR-J677MS/J777MS)<03> ......................... 5-11
AUDIO CONTROL HEAD BOARD ASSEMBLY <12> ............................ 5-16
DEMOD BOARD ASSEMBLY(HR-J777MS) <14> .................................. 5-16
MINI FRONT BOARD ASSEEMBLY(HR-J271MS/J471MS)<28> ........... 5-17
MINI OPE BOARD ASSEEMBLY(HR-J677MS/J777MS)<28> ............... 5-17
LOADING MOTOR BOARD ASSEMBLY <55> ....................................... 5-17
R.PAUSE BOARD ASSEMBLY(HR-J677MS/J777MS)<91> .................. 5-17
LT.BATTERY BOARD ASSEMBLY(HR-J271MS/J471MS)<93> ............. 5-17
LT.BATTERY BOARD ASSEMBLY(HR-J677MS/J777MS)<93> ............. 5-17
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4/5/2017
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