Mitsubishi Electric HS-U449, Service Manual

- 2 -

CONTENTS

- FILE "COVERPGE" -

SPECIFICATIONS ...........................................................1

CONTENTS......................................................................2

GLOSSARY OF ABBREVIATIONS .................................4

- FILE "DISASSY" -

SAFETY PRECAUTIONS ................................................1

CONNECTION .................................................................3

DISASSEMBLY................................................................4

HOW TO EXECUTE CIRCUIT BOARD SERVICE...........7

CHIP PARTS REPLACEMENT........................................9

- FILE "ELCTADJ" -

HOW TO INITIALIZE THE E

2

PROM ................................1

WHEN REPLACING IC5A0 .............................................1

ELECTRICAL ADJUSTMENTS.......................................1

Servo circuit..................................................................2

- FILE "MECHAADJ" -

MECHANICAL ADJUSTMENT

AND REPLACEMENT...............................1

1.

DECK Cleaning...................................................1

1-1

VIDEO HEAD .................................................1

1-2

Tape Running System ....................................1

1-3

REEL DISK Drive System ..............................1

2.

Replacement of Major Parts ..............................2

2-1

CLEANING ARM ...........................................2

2-2

STAY PLATE ..................................................2

2-3

BOTTOM ASSY.............................................3

2-4

INSERT GUIDE (TU) .....................................4

2-5

INSERT GUIDE (SP) .....................................4

2-6

REC HOLDER, REC LEVER,

REC SPRING ................................................5

2-7

F/L ARM ASSY, F/L BEARING ......................5

2-8

A/C HEAD UNIT ............................................6

2-9

F/E HEAD UNIT.............................................6

2-10 SENSOR COVER (TU)..................................7

2-11 SENSOR COVER (SP)..................................7

2-12 REV UNIT (TU),

REV UNIT (SP)..............................................8

2-13 MODE POSITION UNIT ................................8

2-14 REEL BELT, PULLEY BUSH,

THRUST WASHER, 

BELT PULLEY, SHIFT SLIDER,

PULLEY GEAR ASSY, SLIP GEAR,

SLIP SPRING, SLIP WASHER,

THRUST WASHER, SLIP ADJUSTER,

IDLER 2 UNIT................................................9

2-15. CAPSTAN BRAKE SPRING,

CAPSTAN BRAKE ASSY ............................11

2-16 FC HOLDER, MOTOR HOLDER,

LOADING WORM,

LOADING MOTOR ASSY,

WORM WHEEL ...........................................12

2-17 PINCH ARM CAP, PINCH UNIT ..................13

2-18 F/L PLATE, DOOR ARM..............................13

2-19 BRAKE CAM PLATE ...................................14

2-20 GUIDE LAMP ..............................................15

2-21 MAIN CAM, GUIDE ARM (TU),

BRAKE LEVER,LB PIN ...............................16

2-22 L/D LOCK LEVER .......................................17

2-23 BRAKE BELT (SP), BELT HOLDER ............17

2-24 BELT LEVER, BELT ADJUSTER.................18

2-25 TENSION ARM, TENSION LEVER,

TENSION SPRING, TENS AXIS HOLDER,

REEL DISK (SP side) ..................................18

2-26 BRAKE BELT (TU).......................................19

2-27 BRAKE (TU), REEL DISK (TU side)............19

2-28 SHIFT LEVER .............................................20

2-29 CHARGE SPRING, SWING LEVER,

CHARGE ASSY...........................................21

2-30 LOADING ARM ASSY (SP),

LOADING ARM ASSY (TU).........................21

2-31 A/L LEVER ..................................................22

2-32 TAPE GUIDE ASSY (SP),

TAPE GUIDE ASSY (TU) ............................24

2-33 DRUM CLAMPER, DRUM ASSY ................25

2-34 DRUM MOTOR STATOR, BRUSH SPRING,

SPACER, ROTOR CASE, END RING,

BRUSH, UPPER DRUM ASSY ...................26

2-35 CAPSTAN MOTOR ......................................27

3.

Interchangeability Adjustment

of the Mechanism.............................................29

3-1

Adjustment of BACK TENSION and

TENSION POLE's Position ..........................29

3-2

Check and Adjustment of

the FM Envelope..........................................30

3-2-1 GUIDE ROLLER Adjustment Check............30

3-2-2 Height Adjustment of

GUIDE ROLLER (SP)..................................30

3-2-3 Height Adjustment of

GUIDE ROLLER (TU)..................................30

3-2-4 Coarse Adjustment of Phase.......................31

3-2-5 Flatness Check of FM Waveform.................31