Table Of Contents - JVC HR-J691U Service Manual

Section
Important Safety Precautions
INSTRUCTIONS
1. DISASSEMBLY
1.1 Manually removing the cassette tape .......................... 1-1
1.2 Removing the major parts ............................................ 1-2
1.2.1 How to read the procedure table ............................. 1-2
1.2.2 Disassembly/assembly method .............................. 1-2
1.3 Emergency display function ......................................... 1-4
1.3.1 Displaying the EMG information ............................. 1-4
1.3.2 Clearing the EMG history ........................................ 1-4
1.3.3 Details of the OSD display in the EMG display mode ... 1-5
1.3.4 EMG content description ......................................... 1-6
1.3.5 EMG detail information<1> ..................................... 1-7
1.3.6 EMG detail information<2> ..................................... 1-8
1.3.7 EMG detail information<3> ..................................... 1-8
1.4 Service position ............................................................ 1-9
1.4.1 How to set the "Service position" ............................ 1-9
1.5 Jig RCU mode .............................................................. 1-9
1.5.1 Setting the Jig RCU mode ...................................... 1-9
1.5.2 Setting the User RCU mode ................................... 1-9
1.6 Mechanism service mode ............................................ 1-9
1.6.1 How to set the "Mechanism service mode" ............. 1-9
1.6.2 How to exit from the "Mechanism service mode" .... 1-9
1.7 Maintenance and inspection ...................................... 1-10
1.7.1 Cleaning ................................................................ 1-10
1.7.2 Lubrication ............................................................ 1-10
1.7.3 Suggested servicing schedule for main components ... 1-10
2. DISASSEMBLING/ASSEMBLING OF MECHANISM
1. Before disassembling/assembling ................................. 2-1
1.1 Notes ........................................................................... 2-1
1.2 Mechanism operation check ....................................... 2-1
1.3 Setting the mechanism assembling mode .................. 2-1
1.4 Layout of the main mechanism parts .......................... 2-2
1.5 Disassembling procedure table ................................... 2-3
2. Replacement of the main mechanism parts ................... 2-4
2.1 Cassette holder ........................................................... 2-4
2.2 A/C head ..................................................................... 2-5
2.3 Guide arm, pinch roller arm ........................................ 2-6
2.4 Idler arm, idler gear 1/2 ............................................... 2-6
2.5 Main brake(T), brake lever, tension arm,
reel disk(S/T), Rec safety lever ................................... 2-6
2.6 Press lever, control cam, capstan brake assembly,
loading motor assembly .............................................. 2-7
2.7 Capstan motor, load gear, control plate ...................... 2-8
2.8 Clutch unit assembly, direct gear ................................ 2-9
3. Mechanism timing chart ............................................... 2-10
3. 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 ........................................................ 3-1
3.1.5 Manual tracking mode (Auto tracking ON/OFF) setting ... 3-1
3.2 Mechanism compatibility adjustment ........................... 3-2
3.2.1 Tension pole position ............................................... 3-2
3.2.2 FM waveform linearity ............................................. 3-2
3.2.3 Height and tilt of the A/C head ................................ 3-3
3.2.4 A/C head phase(X-value) ........................................ 3-3
3.3 Electrical Adjustment .................................................... 3-4
3.3.1 Servo circuit ............................................................ 3-4
3.3.1.1 Switching point ................................................... 3-4
The following table lists the differing points between models HR-J691U, J691U(C), J694U, J695U(C) and J698U(C).
ITEM
BODY COLOR
RCU ILUMINATION FUNCTION
CHILD LOCK
Notes: Mark is same as left.

TABLE OF CONTENTS

Title
MODEL
HR-J691U
BLACK
NOT USED
NOT USED
Page Section
4. CHARTS AND DIAGRAMS
4.1 BOARD INTERCONNECTIONS ................................ 4-3
4.2 MAIN(VIDEO/N.AUDIO) SCHEMATIC DIAGRAM ..... 4-5
4.3 MAIN(SYSCON) SCHEMATIC DIAGRAM ................. 4-7
4.4 MAIN(SW.REG) SCHEMATIC DIAGRAM .................. 4-9
4.5 MAIN(TUNER) SCHEMATIC DIAGRAM .................. 4-11
4.6 MAIN(FMA/DEMOD) SCHEMATIC DIAGRAM ........ 4-13
4.7 MAIN(FRONT) SCHEMATIC DIAGRAM .................. 4-15
4.8 MAIN(TERMINAL) SCHEMATIC DIAGRAM ............ 4-17
4.9 MAIN CIRCUIT BOARD ........................................... 4-19
4.10 REMOTE CONTROLLER SCEMATIC DIAGRAM . 4-21
4.11 FDP GRID ASSIGNMENT AND ANODE CONNECTION . 4-21
4.12 WAVEFORMS ........................................................ 4-22
4.13 VOLTAGE CHARTS ............................................... 4-23
4.14 CPU PIN FUNCTION ............................................. 4-24
4.15 SYSTEM CONTROL BLOCK DIAGRAM ............... 4-25
4.16 VIDEO BLOCK DIAGRAM ..................................... 4-27
4.17 AUDIO BLOCK DIAGRAM ..................................... 4-29
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> ............................ 5-10
LOADING MOTOR BOARD ASSEMBLY<55> ............... 5-10
HR-J691U(C) HR-J694U
Title
HR-J695U(C) HR-698U(C)
PURE-SILVER BLACK
USED
USED NOT USED
Page