Panasonic JU-253-T

CONTENTS
Page
PART 1
1. INTRODUCTION · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · ·. · .. · · · .. ·. · .. · ........ .
2. MODELS AND MODEL NUMBERS · ··· ····· · ····· ·· ·· · ··· ·· ··· · · ···· · ..... ·· ..... ··· .... · .... ··· ..•.. .. ... . .... .. . ..... ...... 1
3. SPECIAL TOOLS · · · · · · · · · · · · · · · · · · ·· · · · · ·· · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·. · ·. ·....... •. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
4. OUTLINE OF MAINTENANCE ···· ······ · ····· · ···· ·· ·· · ·· ··· ·· ····· · .... ·· · ···· ··•·· ... · ...... ·· .. ... . .... ..... .. .. . . . ..... .. . 2
5. DIAGNOSTIC PROCEDURES ················ ················································································· 2
5.1
5.2
5.3
5.4
5.5
Error Symptom Recognition ··· ·· ··· ·········· ···················· ············ ................................... .
Soft Error Detection and Correction -· ···· .. ··. ·· · ................ ·· ............................................ -
Write Error
Read Error
Seek Error
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5.6 Interchangeability Error .............. ·····························-·· ·······-······· .......... ..................... 3
6. TROUBLE ANALYSIS · ··· ·· ····· ·· ·· ····· ·· · · · · · ··· · · ··· ·· ···· · ···· ··· ··· ·· ····· ·· ·· ·· · ·· ··· ··· · ··· ·· ·· · ·· ·· ··· ·· ··· ·· · ···· ··. 3
6.1 Trouble Analysis Procedure ·· ·· ·· - ···· · ····· ·· ··· ·· ·· ·. · ··· · · ··· ·· · ·· ····· .. ··· ·· ·· · ·· ··· ·· ··· ·· ... ·· ··· ·· ··· ·· ··· · 3
6.2 Trouble Shooting Flow Chart -· -·· ··. · ···. · ···· ··· ··· · · ·· ··· ·· ···· · ···· ··· ···· ··· ·· ····· ·· ·· · ·· ····· ·· ····· ····· · 4
6.3 Trouble Analysis Table ... · ·· ..... · · · ·· ····· ·· ... · · · ···· ····· ····· ·· ··· ·· · ·· ·· ··· · · · ·· ·· ····· ····· ·· · -· ···· · ·· ··· ·· · 5
7. PREVENTIVE MAINTENANCE -······························································································· 6
8. MEASUREMENT ITEMS ··· ·· · ···· ·· ··· ·· ··· · · ·· · ·· · · ··· ·· ····· ·· ···· · · · · ·· ··· · ·· ··· ·· ··· ····· ·· ··· ·· ···· · ·· ··· ···· · ·· · ···· · · · · 6
9. ADJUSTMENTS AND VERIFICATIONS ··················································································· ···· 7
9.1 Motor Speed Verification (Index Period) ·· ····· ··· ·· ·· ··· ····· ······· ···· · ······· ····· ····· ·· ····· ·· · ·· ····· ·· ·· 7
9.2 Write Protect Verification ······· ·· ·· ··· ·· · · · ·· ··· ·· · ·· ·· ··· ·· ·· ··· ··· ·· ···· ······ ····· ··· ·· ····· ····· ·· ··· ····· ·· ·
9.3 Head Output Verification .......•.................................................................................
9.4 Output Modulation Verification .. ·· ............•.... ··· ·· ..•...................................................
9.5 Resolution Verification ...........................................................•...............................
9.6 Radial Alignment Adjustment .......... ·· ····· ··· ·· ····· · ···· ····· ···· · ····· ····· · ···· · ···· ····· ····· · · ··· ·· ··· ··
9.7 Azimuth Verification .............................................................................................. .
9.8 Index Burst Verification and Adjustment ···· ·· ·· · ·· ·· ·· ··· · ·· ······· ···· · ·· ··· ·· ··· · · ····· ·· ···· · ····· · · ····· ····
9.9 Track 00 Sensor Adjustment .... · ... · .... ·· .......... ·. ··· ····· ·· ................................................ .
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9. 10 Asymmetry Verification · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· · · · · · · · · · · · · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 12
10. TEST POINT ············································································•····································•· 13
11.
PANASONIC ALIGNMENT DISKETTE
PART 2 [JU-253-T]
12. DISASSEMBLY AND REASSEMBLY
12.1 Removing and Remounting the Cover .......................................................................... .
12.2 Removing and Remounting the Front Panel Assembly ....................................................... .
12.3 Removing and Remounting the Guide Plates ................................................................... .
12.4 Removing and Remounting the Holder Assembly and Rollers ............................................... .
12.5 Removing and Remounting the Head FPC, Track 0 Connector,
and Stepper Motor Connector ................................................................................ .
12.6 Removing and Remounting the Head Carriage Assembly, Rod Clamp, and Guide Rod .................. .
12.7 Removing and Remounting the Track 0 Assembly ............................................................ .
12.8 Removing and Remounting the Stepper Motor •...................•..........................................
12.9 Removing and Remounting the Trigger Lever Assembly ..................................................... .
12.10 Removing and Remounting the Eject Lever Springs .......................................................... .
12.11 Removing and Remounting the Eject Lever .................................................................... .
12.12 Removing and Remounting the Shield Plate ................................................................... .
12.13 Removing and Remounting the Microswitch Assembly ....................................................... .
12.14 Removing and Remounting the Mounting Brackets ..............•...........................................
12.15 Removing and Remounting the Control PC Board ............................................................ .
12.16 Removing and Remounting the Drive Motor Assembly ....................................................... .
12.17 Disassembling and Reassembling the Mounting BracketAssembly •.........................................
12.18 Removing and Remounting the Pushbutton ................................................................... .
12.19 Disassembling and Reassembling the Holder Assembly ....................................................... .
11.20 Mounting the Drive Motor LED
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