JVC HR-J425EG Magnetoscope a cassette
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Modèle:
HR-J425EG
Date:
1995
Catégorie:
Groupe:
Description:
Type manuel:
manuel de réparation
Pages:
74
Taille:
15.75 Mbytes (16515224 Bytes)
Langue:
english
Révision:
Manuel-ID:
82461
Date:
1995 04 01
Qualité:
Document scanné, la lecture en partie mal, en partie illisible.
Date de transfert:
2017 05 15
MD5:
e6aa1244fc03ba3cc8c412d4461dfb5d
Téléchargements:
1306
Information
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 CASSETTE HOUSING
INSTALLATION ... 1-4
1.5 SERVICE
POSITION ... 1-4
1.5.1 How to take out the Mechanism and Main board
assemblies ... 1 -4
1.5.2 Cautions on cassette loading when mechanism is in
service
position ...
1-5
1.5.3 Cassette loading and ejecting procedures when
mechanism is in service
position ... 1-5
1.5.4 Opening on the
chassis ... 1 -6
1.6 MECHANISM SERVICE
MODE ... 1-7
1.6.1 How to set the “MECHANISM SERVICE MODE* ... 1-7
1.7 EMERGENCY DISPLAY
FUNCTION ... 1-8
1.7.1 How to display record of an emergency
faults ... 1-8
1.7.2 Detail of emergency
faults ... 1 -8
1.7.3 How to clear emergency
record ... 1-8
2. MECHANISM ADJUSTMENT
2.1
PREPARATION ... 2-1
2.1.1
Precautions ... 2-1
2.1.2 Check without cassette housing
assy ... 2-1
2.1.3 Manual removal of loaded
tape ... 2-1
2.1.4 Test
Equipment ... 2-2
2.2 MAIN MECHANISM
PARTS ... 2-2
2.2.1
Cleaning ... 2-3
2.2.2
Lubrication ... 2-3
2.3 INSPECTION AND
MAINTENANCE ... 2-4
2.3.1 Suggested servicing schedule for main Components ... 2-4
2.4.1 Precaution before disassembling
mechanism ... 2-4
2.4.2 How to set the exclusive mechanism operation mode
(MECHANISM ASSEMBLING MODE) ... 2-4
2.5 MAIN PARTS REPLACEMENT OF MECHANISM ... 2-4
2.5.1 Pinchi Roller Arm
Assy ... 2-4
2.5.2 A/C
Head ... 2-5
2.5.3 Pinch
plate ... 2-5
2.5.4 Mode
Motor ...
2-6
2.5.5 Lever Assy,Sub Deck Assy,Capstan
Motor ... 2-6
2.5.6 Cortrol Bracket-1,Earth
Plate ... 2-7
2.5.7 Reel Bracket, Slit Disk
(take-up) ... 2-7
2.5.8 Control Bracket-2.Control
Plate ... 2-7
2.5.9 Sub Brake (take-up),Cortrol
Cam ... 2-8
2.5.10 Slide
Plate ...
2-8
2.5.11 Change Lever,Rotary
Encoder ... 2-8
2.5.12 Sub Brake (supply), Tension Band Assy .Tension Arm
Assy, Take-up Lever Assy, Slit Disk (supply) ... 2-9
2.5.13 Take -up Head, Tension Arm
Lever ... 2-9
2.5.14 Guide
Rail ... 2-10
2.5.15 Stator
Assy ... 2-10
2.5.16 Rotor
Assy ... 2-10
2.5.17 Upper Drum
Assy ... 2-11
2.6 CHECKUP AND ADJUSTMENT OF MECHANISM PHASE ... 2-12
2.6.1
Precaution ... 2-12
2.6.2 Loading Arm
Assy(supply,take-up) ... 2-12
2.6.3 Rotary Encoder,Change Lever,Control
Cam ... 2-13
2.6.4 Slide
plate ... 2-13
2.6.5 Control
Plate ... 2-13
Section Title Page
2.7 TAPE INTERCHANGEABILITY ADJUSTMENT ... 2-14
2.7.1 Tape pattern
... - ... 2-14
2.7.2 A/C head height &
azimuth ... 2-15
2.7.3 A/C head phase
(X-value) ... 2-16
2.7.4 LP mode auto
tracking ... 2-16
2.7.5 Tension pole
position ... 2-17
2.7.6 Take-up
torque ... 2-17
3.ELECTRICAL ADJUSTMENT
3.1
PRECAUTION ... 3-1
3.1.1 Required test
equipment ... 3-1
3.1.2 Required adjustment
tools ... 3-1
3.1.3 Colour bar signal,colour bar
pattern ... 3-1
3.2 SERVO
CIRCUIT ... 3-2
3.3 VIDEO
CIRCUIT ... 3-3
3.3.1 EE Y
LEVEL ... 3-3
3.3.2 WHITE / DARK
CLIP ... 3-3
3.3.3
CARRIER ... 3-4
3.3.4
DEVIATION ... 3-4
3.3.5 REC COLOR
LEVER ... 3-4
3.3.6 PB Y
LEVEL ... 3-4
3.4 SYSCON
CIRCUIT ... 3-5
3.4.1 Timer
clock ... 3-5
3.5 TUNER
CIRCUIT ... 3-5
3.5.1
RFAGC ... 3-5
4. CHARTS AND DIAGRAMS
SCHEMATIC DIAGRAM
NOTES ... 4-1
CIRCUIT BOARD
NOTES ... 4-2
4.1 BOARD
INTERCONNECTIONS ... 4-3
4.2 VIDEO BLOCK
DIAGRAM ... 4-5
4.3 SYSCON/SERVO BLOCK
DIAGRAM ... 4-7
4.4 TUNER SCHEMATIC
DIAGRAM ... 4-9
4.5 AUDIO SCHEMATIC
DIAGRAM ... 4-11
4.6 VIDEO SCHEMATIC
DIAGRAM ... 4-13
4.7 SERVO SCHEMATIC
DIAGRAM ... 4-15
4.8 SYSTEM CONTROL SCHEMATIC DIAGRAM ... 4-17
4.9 SWITCHING REGULATOR SCHEMATIC DIAGRAM ... 4-19
4.10 MAIN AND A/C HEAD CIRCUIT BOARDS ... 4-21
4.11 TERMINAL & MAIN(TERMINAL)SCHEMATIC DIAGRAMS ... 4-25
4.12 TERMINAL CIRCUIT
BOARD ... 4-29
4.14 DISPLAY/SW.SW/JACKREC SAFETY AND CASSETTE SW CIRCUIT
BOARDS (for(HR-J425E)
... 4-31
4.15 DISPLAY & SW/JACK SCHEMATIC DIAGRAMS(for
HR-J425EG) ... 4-33
4.16 DISPLAY,SW/JACK FEC SAFETY AND CASSETTE SW CIRCUrT
BOARDS(for
HR-J425EG) ... 4-35
4.17 PRE/REC SCHEMATIC DIAGRAM
... 4-37
4.18 PRE/REC CIRCUIT
BOARD ... 4-39
4.19 VPS SCHEMATIC
DIAGRAM ... 4-41
4.20 REMOTE CONTROL SCHEMATIC DIAGRAM ... 4-42
5. PARTS LIST
5.1 PACKING AND ACCESSORY
<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
<03> ... 5-6
TERMINAL BOARD ASSEMBLY
<06> ... 5-11
AUDIO/CONTROL HEAD ASSEMBLY <12> ... 5-11
DISPLAY BOARD ASSEMBLY
<28> ... 5-11
REC SAFETY BOARD ASSEMBLY <32> ...
5-12
CASS SW BOARD ASSEMBLY
<33> ... 5-12
SWITCH/JACK BOARD ASSEMBLY <36> ... 5-12
PRE/REC AMP BOARD ASSEMBLY <43> ... 5-13
6 TECHNICAL INFORMATION
6.1 SYSCON
CIRCUIT ...
6-1