Table Of Contents - JVC HR-S6850MS 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 Servicing items related to video navigation .......................... 1-4
1.8 Emergency display function .................................................. 1-5
1.8.1 Displaying the EMG information ...................................... 1-5
1.8.2 Clearing the EMG history ................................................ 1-5
1.8.3 EMG content description ................................................. 1-6
1.8.4 EMG detail information <1> ............................................. 1-7
1.8.5 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
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
The following table lists the differing points between Models ( HR-S6850MS, HR-S7850MS, HR-S7851MS and HR-S8850MS) in this series.
FLYING ERASE HEAD
DIGITAL 3R/TBC/FRAME MEMORY
YNR/CNR/S.COLOR
RE-TAKE/ASSEMBLE EDIT
INSERT/OPERATION,
AUDIO DUBBING / OPERATION
HiFi LEVEL METER
R.PAUSE TERMINAL
REAR OUT
CABLE BOX OR DBS. BOX OR SAT CTL
CABLE MOUSE
RCU
RCU TYPE / COLOR
RCU MBR /IR CODE
F-AV CAP
WINDOW COLOR

TABLE OF CONTENTS

Page
HR-S6850MS HR-S7850MS
NOT USED
NOT USED
NOT USED / 2D/NOT USED NOT USED / 2D / NOT USED NOT USED / 2D / NOT USED USED (3D) / 3D / USED (3D)
NOT USED / A.F.E. USED / Z.F.E.
NOT USED USED/BUTTON
NOT USED
NOT USED
AUDIO L/R AUDIO L/R & S-OUT
OPTION
OPTION
V13 SMALL 10KEY V13 SMALL 10KEY
V14#E11-S / SILVER V14#E11-S / SILVER
NOT USED / A NOT USED / A
NOT USED
SMOKE LIGHT GRAY SMOKE LIGHT GRAY
Section
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
3.3.4 Video EQ (Frequency response) ..................................... 3-3
3.3.5 Auto picture initial setting ................................................. 3-4
3.4 Audio circuit .......................................................................... 3-4
3.4.1 Audio REC FM ................................................................. 3-4
3.5 Syscon circuit ....................................................................... 3-4
3.5.1 Timer clock ...................................................................... 3-4
3.6 PAL/SECAM Converter circuit .............................................. 3-5
3.6.1 Colour difference level ..................................................... 3-5
3.6.2 SECAM burst position ..................................................... 3-5
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 (SECAM) SCHEMATIC DIAGRAM ............................. 4-9
4.5 MAIN (SYSCON) SCHEMATIC DIAGRAM ........................ 4-11
4.6 MAIN (SW.REG) SCHEMATIC DIAGRAM ......................... 4-13
4.7 MAIN (TUNER) SCHEMATIC DIAGRAM ........................... 4-15
4.8 MAIN (SW/DISPLAY), MINI FRONT, S-JACK AND ADV. JOG
SCHEMATIC DIAGRAMS ..................................................... 4-17
4.9 MAIN (MAIN TERMINAL) SCHEMATIC DIAGRAM ............ 4-19
4.10 2D DIGITAL SCHEMATIC DIAGRAM
[HR-S6850MS/S7850MS/S7851MS] ............................... 4-21
4.11 3D/TBC(2M) SCHEMATIC DIAGRAM [HR-S8850MS] .... 4-23
4.12 TERMINAL (S-SUB) SCHEMATIC DIAGRAM ................. 4-25
4.13 TERMINAL (I/O) SCHEMATIC DIAGRAM ....................... 4-27
4.14 DEMODULATOR SCHEMATIC DIAGRAM ...................... 4-29
4.15 S-P CONVERTER SCHEMATIC DIAGRAM .................... 4-31
4.16 MAIN CIRCUIT BOARD ................................................... 4-33
4.17 2D DIGITAL AND 3D DIGITAL/2M CIRCUIT BOARDS ... 4-36
4.18 TERMINAL CIRCUIT BOARD ......................................... 4-37
4.19 S-P CONVERTER AND DEMODULATOR CIRCUIT BOARDS 4-38
4.20 FDP GRID ASSIGNMENT AND ANODE CONNECTION 4-39
4.21 REMOTE CONTROLLER SCHEMATIC DIAGRAMS ...... 4-40
4.22 WAVEFORMS .................................................................. 4-41
4.23 VOLTAGE CHARTS ......................................................... 4-43
4.24 CPU PIN FUNCTION ....................................................... 4-45
4.25 SYSTEM CONTROL BLOCK DIAGRAM ......................... 4-47
4.26 VIDEO BLOCK DIAGRAM ............................................... 4-49
4.27 AUDIO BLOCK DIAGRAM ............................................... 4-53
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
2D DIGITAL BOARD ASSEMBLY <05>(MODEL:A,B,C) ......... 5-14
3D DIGITAL/2M BOARD ASSEMBLY <05>(MODEL:D) .......... 5-15
TERMINAL BOARD ASSEMBLY <06> ................................... 5-16
A/C HEAD BOARD ASSEMBLY <12> ..................................... 5-18
DEMOD BOARD ASSEMBLY <14> ........................................ 5-18
MINI FRONT BOARD ASSEMBLY(MODEL:B,C,D)<28> ........ 5-19
S JACK BOARD ASSEMBLY <36> ......................................... 5-19
ADV.JOG BOARD ASSEMBLY <38> ....................................... 5-19
LOADING MOTOR BOARD ASSEMBLY <55> ....................... 5-19
S/P CONVERTER BOARD ASSEMBLY <87> ........................ 5-19
HR-S7851MS
USED USED
NOT USED NOT USED
USED / Z.F.E.
USED/BUTTON
USED USED
USED USED
AUDIO L/R & S-OUT
OPTION OPTION
OPTION OPTION
V13 SMALL 10KEY
V14#E11-S / SILVER
NOT USED / A
USED USED
GREEN
Title
HR-S8850MS
USED
USED
USED / Z.F.E.
USED/BUTTON
USED
USED
AUDIO L/R & S-OUT
USED
PROVIDED
V13 LCD
V14#E5 / LIGHT BEIGE
USED (TV, SAT/CABLE) / A, B
USED
SMOKE LIGHT GRAY
Page