Table Of Contents - Panasonic JU-3 3 Series Service Manual

CONTENTS
Page
1. GENERAL DESCRIPTION OF MAINTENANCE AND MAINTENANCE EQUIPMENT
1.1 Alignment Diskette .. ~ ........................................................................................................................ .
1.2 Exerciser ........................ ; ............. : .................................................................................................. .
1.3 Special To.ols ................................................................................................................................... .
2. DIAGNOSTIC PROCEDURES
2.1 Introduction..................................................................................................................................... 2
2.2 Soft Error Detection and Correction...................................................................................................... 2
2.3 Write Error . .. . ... . .. . ... .. . . .... . ... .. ....... ... .. ...... . ... .. . .. ... . ..... .. . .... .. .... .. . ... . .... . . . . .. ... . . . ... . . . ... . .. . .. ... . . . . .. .. . . . . . . . . . 2
2.4 Read Error . . . . . . . .. . . .. .. .. . .. .. .. .. . . .. . .. .. .. .. . .. . . . . .. .. . . . . .. . . . . . . .. .. . . .. . .. .. . . . . . .. . . .. . . .. . . .. .. .. . . . . . . . . .. .. . . .. . . .. . . .. . . .. . . . . . . . . . 2
2.5 Seek Error . . . .. . . ... . . . . . . ... . .. . .. ... .. . ... ....... ... ... ..... . . .. .. ...... .. .. .. . ..... .. . . .. . .. ... .. .. .. . ... . ..... . . . ... .. . .. . . . . ... . . . .. . . . . . . . . 2
2.6 Compatibility Error ............................................................................................. ........................ .. .... 2
3. TROUBLESHOOTING FLOW
3.1 Troubleshooting Procedure .. . . .. ... ... . .. .. ........ ... ..... .. . . .. ... . . ... . . .. .. .. ..... ... ....... ...... ... .. .... .. ... .... ... . . ... . . . . . . . . . . . 3
3.2 Troubleshooting Flow . . . . . .... .. . ... .... .. ... ............... .... . . . .. ... . ... .. .. .. .. . ... .. .. .... . ... .. .. .. .. . .. . .. . .. ............ ... . .. . .. . . . 3
3.3 Troubleshooting Table .. . . .... ... . .... .. .. .... . . .. .. .. ..... . .... .. ..... . . . . .. . . .. ... . ..... . . .... .... .. . ... ... ... .. ... ... ...... . .. .. . .. . . .. . . . . 4
4. ADJUSTMENTS AND CHECKS
4. 1 Motor Speed Check .. .. .. .. .. .. .. .. .. .. .. .. .. . .. .... . .. .. . .. . .. . .. .. . .. . .. .. . .. .. .. .. . .. . . .. .. .. .. .. .. . .. . .. . .. .. .. . .. .. .. .. . .. .. .. .. .. .. . . . .. . 5
4.2 Write Protect Check .. ,, ....... ,,,,., .. ,....................................................................................................... 5
4.3 Head Amplitude Check....................................................................................................................... 5
4.4 Modulation and Resolution Check ... .... .. ... ... ... . .. .. .... .. .. ........ .... .. .... .. .. . .. .. . .. ...... .. ... .. .. .. ....... ............. ... .. . · 5
4.5 Radial Alignment ............................................................................................................................ 6- 7
4.6 Azimuth Check . . . .. ... . .. . . . ... . .. ... . . . .. .. . . .. . . .. .. .. .. .. . . .. . .. . .. .. . . .. . . ... . . .. . .. .. . . .. . . . . . . . .. ... ... . . .. .. . .. . . . . .. . .. . . . .. .... ... . . . . 8
4.7 Index Burst Check............................................................................................................................. 8
4.8 Track 00 Sensor Adjustment .. .. . .. . .. . .. .. . .. .. .. .. .. .. .. .. .. .. .. .. . .. .. .. .. . .. .. . .. .. .. .. . . .. .. .. .. . .. .. .. .. .. . .. . . .. . . .. . .. .. .. . .. . .. . .. . 9
4.9 Limiter Adjustment . .. . . .. . . . . .. . . . .. . . .. . .. .. . .. . . .. .. . . .. ... .. . . . .. . . . . . . . . . . . . . .. .. .. .. .. . . . . . . . . . ... .. . . .. . . . . . . . . . . .. . . . .. . .. . . .. .. .... . . 9
4. 10 Asymmetry Check and Adjustment .. .. .. . . .. .. .. .. .. .. .. ... .. . .. .. .. . .. . .. .. .. .. .. .. .. .. . .. .. .. .. .. . .. . .. .. . .. .. .. .. . .. .. . .. .. .. .. . .. .. .. 9
4.11 Test Point ........................................................................................................................................ 10
5. REMOVALS AND INSTALLATIONS
5.1 Cover Removal and Installation ................ ... ... .... ...... ..... ... .. ..... .. .... ........... ...... ............ ....... .... .... ... .. . .. ... 11
5.2 Mounting Bracket Removal and Installation ............................................................................................ 11
5.3 Front Panel and Eject Button Removal and Installation ... ............. .......... ....... ...... ... . .. .. . ...... . .. ... . .. ... .. . .. ..... 11
5.4 Holder Assembly Removal and Installation ............................................................................................. 11
5.5 Write Protect Assembly Removal and Installation .................................................................................... 11
5.6 Head Stepper Motor Assembly Removal and Installation ........................................................................... 11
5.7 Head and Stepper Motor Removal and Installation ................................................................................... 12
5.8 Eject Lever Removal and Installation .................................................................................................... : 13
5.9 Control Printed Circuit Board Removal and Installation ............................................................................ 13
5.10 Drive Motor Removal and Installation.................................................................................................... 13
EXPLODED VIEW·1 .......................... : ................................................................................................... 14
EXPLODED VIEW·2 ......................................................................................................... ' . ....................
15
REPLACEMENT PARTS LIST OF BASIC MODEL ..................................................................................... 16
REPLACEMENT PARTS LIST OF BASIC MODEL ............................................................................... 17 - 18
SCHEMATIC DIAGRAM OF CONTROL BOARD . .. ... ..... ...... .. . .... . .. . .. . ..... ... .. .. .. .. .. . .. ... .. .. .. .. . .. .. .. ... ... .. .. . . .. . .. 19
SCHEMATIC DIAGRAM OF DRIVE MOTOR ............................................................................................ 20
CIRCUIT BOARD OF CONTROL BOARD ................................................................................................
21
CIRCUIT BOARD OF DRIVE MOTOR ..................................................................................................... 22