Table Of Contents - Panasonic JU-475-4 Service Manual

so
10.
11.
12.
13.
14.
15.
16.
17.
18.
CONTENTS
PARTI Page
INTRODUCTION: z; a A A A eee a a 1
MODELS AND MODEL NUMBERS .................................neneneneenaeetensusesusneee nen iGO 1
2.1 5:25inch FOD SONOS ze a b b o td Hud 1
SPECIAL TOOLS u isba can eos dE ij Wi E GTE SIS mäele W a A 1
OUTLINE OF MAINTENANCE ........................................................................ 2
44 AligamentDiskette: issir Idi mia Ta e bt okt 2
42 Exerciser > pcs tute se a L A a ti us 2
DIAGNOSTIC PROCEDURES ......................................................................... 2
5. Error Symptom Recognition .........LL rr asa aN S 2
5.2 Soft Error Detection and Correction ........................................................ 2
5.3 Write: ETO, sortere di ia ame ae PRESSE ADE e EPO Da AD ia eat 2
5.4 Read Error ido A 3
5.5 A iD ia kt a ae tema ahh daa eddies Veke DEA 3
5.6 Interchangeability Error 22.26. ce cece r rr ran rnnnzrenzza 3
TROUBLE: ANALYSIS" assi sais Se pindadele ari dada ww vine bee Melb edie tee tee Waves a ede we weet eee E 3
6.1 Trouble Analysis Procedure... 2.2... ll corro 3
6.2 Troubleshooting Flow Chart ...... 2.22... rr eee e nn 4
6.3 Trouble Analysis Table ..........................:..0:ererereeeneenenneseeeeeraseeeera seene 5
PREVENTIVE MAINTENANCE ....................................................................... 6
SPECIFICATIONS: 4 assa ss a Sees GG em ama o arenaene köie A aa a 6
ADJUSTMENTS AND VERIFICATIONS ................................................................ 7
9.1 Motor Speed Verification (Index Period) .................................................... 7
9.2 Write Protect Verification Ruya uu lulus senennnnnennnzenenzznnnnnnzznrnnnnzenezznnzna 7
9.3 Head Output Verification GT Sel Ok Wack ae ean CENA oe deo nts A REESE 7
9.4 Output Modulation Verification ........................................................... 8
9.5 Resolution Verification .........................::::::ersrerreeenrresetatss nr 8
9.6 Radial Alignment Verification and Adjustment .............................................. 8
9.7 Azimuth Verification" curar tk lade seas para iD 9
9.8 Index Burst Verification and Adjustment _.................................................... 10
9.9 Track 0 Sensor Adjustment ................................................................ 10
9.10 Asymmetry Verification su S u g tau rr ih 11
TESTPOINTS sets diac oe Oy Po w san a we ees 12
PANASONIC ALIGNMENT DISKETTE ................................................................. 13
PARTII
REMOVALS AND INSTALLATIONS ................................................................... 14
12.1 PCB Removal and Installation .............................................................. 14
12.2 Front Plate and Handle Removal and Installation ............................................ 14
12.3 Track 0 Sensor Removal and Installation .................................................... 15
12.4 Collet Assembly Removal, Installation, and Adjustment ...................................... 15
12.5 Clamp Assembly Removal and Installation .................................................. 16
12.6 Write Protect Sensor Assembly and Index Sensor Assembly Removal and Installation ............ 16
12.7 Cartridge Guide Assembly Removal and Installation ......................................... 17
12.8 Stepper Motor Assembly Removal and Installation .......................................... 18
12.9 Head Carriage Assembly Removal and Installation .......................................... 18~ 19
12.10 Drive Motor Removal and Installation ......................................... SAY 20
12.11 LED Assembly Removal and Installation .................................................... 21
12.12 Lifter Unit Removal and Installation ..........00 Lane nee nnnn ene eee eees 21
12.13 Media Lifter Removal and Installation ...................................................... 22
12.14 Media Sensor Assembly Removal and Installation ............................................ 22
EXPLODED VIEW L: mis vedas Sue ekke malai EE sa A add 23
REPLAĊEMENT PARTS LIST: iii iii A s i sal 24
REPLACEMENT PARTS LIST FOR PCB ........................nnenuervenesenevasearsunneseeennne ave nn 25-26
SCHEMATIC DIAGRAM): sims O died Gnd DOP owy ed 27
CIRCUIT BOARD: hr ġa dead 28-29
BLOCK DIAGRAM) ii ao 30