Table Of Contents - JVC HR-J271MS Service Manual

Video cassette recorder

Hide thumbs Also See for HR-J271MS:

Instructions manual (46 pages)

Service manual (84 pages)

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

Table of Contents

www.freeservicemanuals.info

Section

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

The following table lists the differing points between Models (HR-J271MS, HR-J471MS, HR-J677MS, HR-J777MS) in this series.

VIDEO HEAD

HiFi AUDIO

HiFi LEVEL METER

FRONT VIDEO/AUDIO INPUT(RCA)

VCR PLUS+

REMOTE PAUSE

STILL/PAUSE/FRAME ADVANCE

Title

HR-J271MS

2 HEAD

NOT USED

REDUCED NOISE

Digitized in Heiloo Netherland

Page

Section

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

HR-J471MS

4 HEAD (DA4)

NOT USED

USED

NOT USED

NOISELESS

Title

HR-J677MS

HR-J777MS

4 HEAD (DA4)

USED

NOT USED

SHOW VIEW

USED

NOISELESS

4/5/2017

Page

Show Quick Links

Quick Links:
Table of Contents

Hide quick links:

Chapters

Table of Contents

This manual is also suitable for:

Hr-j471ms Hr-j677ms Hr-j777ms

Table Of Contents - JVC HR-J271MS Service Manual