Table Of Contents - JVC HR-J580EK Service Manual

Section Title
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 set the "Service position" ..................................... 1-4
1.5 Mechanism service mode ..................................................... 1-4
1.5.1 How to set the "Mechanism service mode" ..................... 1-4
1.6 Jig RCU mode ....................................................................... 1-4
1.6.1 Setting the Jig RCU mode ............................................... 1-4
1.6.2 Setting the User RCU mode ............................................ 1-4
1.7 Emergency display function ................................................. 1-5
1.7.1 Displaying the EMG information ...................................... 1-5
1.7.2 Clearing the EMG history ................................................ 1-5
1.7.3 EMG content description ................................................. 1-6
1.7.4 EMG detail information <1> ............................................. 1-7
1.7.5 EMG detail information <2> ............................................. 1-8
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 A/C 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
The following table lists the differing points between Models ( HR-J680EK, HR-J680EU, HR-J780EU and HR-J785EK) in this series.
JOG/SHUTTLE
VIDEO SYSTEM
BROADCASTING STANDARD
STEREO DECODER
RF OUT SYSTEM [INITIAL]
VCR PLUS+
LANGUAGE [INITIAL] (ON SCREEN DISPLAY)
AUDIO DUBBING/OPERATION
FRONT VIDEO/AUDIO IN
WINDOW COLOR
REMOTE PAUSE
CABLE MOUSE

TABLE OF CONTENTS

Page
HR-J680EK
NOT USED
PAL PAL/MESECAM(MANUAL)
I
NICAM
I
VIDEOPLUS+ DELUXE SHOWVIEW DELUXE
ENG 13LANG.[ENG]
NOT USED
NOT USED
SMOKE LIGHT GRAY SMOKE LIGHT GRAY
NOT USED
PROVIDED
Section
2.2.24 Rotor assembly ........................................................... 2-14
2.2.25 Upper drum assembly ................................................. 2-15
2.3 Compatibility adjustment .................................................... 2-16
2.3.1 FM waveform linearity ................................................... 2-16
2.3.2 Height and tilt of the A/C head ....................................... 2-17
2.3.3 A/C head phase (X-value) ............................................. 2-17
2.3.4 Standard tracking preset ............................................... 2-18
2.3.5 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
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 [HR-J680EU/J780EU] ................................... 3-2
3.4.1 Timer clock ...................................................................... 3-2
4. CHARTS AND DIAGRAMS
NOTES OF SCHEMATIC DIAGRAM .......................................... 4-1
CIRCUIT BOARD NOTES ........................................................... 4-2
4.1 BOARD INTERCONNECTIONS .......................................... 4-3
4.2 MAIN(VIDEO/AUDIO) SCHEMATIC DIAGRAM ................... 4-5
4.3 MAIN(ON SCREEN) SCHEMATIC DIAGRAM ..................... 4-7
4.4 MAIN(SYSCON) SCHEMATIC DIAGRAM ........................... 4-9
4.5 MAIN(SW.REG) SCHEMATIC DIAGRAM ........................... 4-11
4.6 MAIN(TUNER) SCHEMATIC DIAGRAM ............................ 4-13
4.7 MAIN(FRONT) AND ADV.JOG SCHEMATIC DIAGRAMS . 4-15
4.8 MAIN(TERMINAL), SAT CTL AND R.PAUSE SCHEMATIC
DIAGRAMS ........................................................................ 4-17
4.9 REMOTE CONTROLLER SCHEMATIC DIAGRAM ........... 4-19
4.10 MAIN, SAT CTL AND R.PAUSE CIRCUIT BOARDS ....... 4-21
4.11 FDP GRID ASSIGNMENT AND ANODE CONNECTION 4-23
4.12 WAVEFORMS .................................................................. 4-24
4.13 VOLTAGE CHARTS ......................................................... 4-25
4.14 CPU PIN FUNCTION ....................................................... 4-26
4.15 SYSTEM CONTROL BLOCK DIAGRAM ......................... 4-27
4.16 VIDEO BLOCK DIAGRAM ............................................... 4-29
4.17 AUDIO BLOCK DIAGRAM .............................................. 4-31
5. PARTS LIST
5.1 PACKING AND ACCESSORY ASSEMBLY <M1> ............... 5-1
5.2 FINAL ASSEMBLY <M2> .................................................... 5-2
5.3 MECHANISM ASSEMBLY <M4> ........................................ 5-4
5.4 ELECTRICAL PARTS LIST .................................................. 5-6
MAIN BOARD ASSEMBLY <03> ............................................... 5-6
A/C HEAD BOARD ASSEMBLY <12> ..................................... 5-13
ADV.JOG BOARD ASSEMBLY(HR-J780EU/J785EK) <38> ... 5-13
LOADING MOTOR BOARD ASSEMBLY <55> ....................... 5-13
R.PAUSE BOARD ASSEMBLY(HR-J780EU)<91> ................. 5-13
SAT_CTL BOARD ASSEMBLY <92> ...................................... 5-13
HR-J680EU HR-J780EU
NOT USED USED
PAL/MESECAM(MANUAL)
B/G,D/K B/G,D/K
NICAM/A2 NICAM/A2
G,K G,K
SHOWVIEW DELUXE
13LANG.[ENG]
NOT USED USED/BUTTON
NOT USED USED
BLUE
NOT USED USED
OPTION OPTION
Title
HR-J785EK
USED
PAL
I
NICAM
I
VIDEOPLUS+ DELUXE
ENG
NOT USED
NOT USED
SMOKE LIGHT GRAY
NOT USED
PROVIDED
Page