Panasonic JU-253-T

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Matsushita Communication Industrial Co., Ltd.

Memory

Systems Division

3-1, 4-chome, Tsunashima-Higashi

Kohoku·ku, Yokohama 223 JAPAN

Main Page

Table of Contents2
Introduction4
Models and Model Numbers4
Special Tools4
Outline of Maintenance5
Diagnostic Procedures5
Error Symptom Recognition5
Soft Error Detection and Correction5
Write Error5
Read Error6
Seek Error6
Interchangeability Error6
Trouble Analysis6
Trouble Analysis Procedure6
Trouble Shooting Flow Chart7
Trouble Analysis Table8
Preventive Maintenance9
Measurement Items9
Adjustments and Verifications10
Motor Speed Verification (Index Period)10
Write Protect Verification10
Output Modulation Verification10
Head Output Verification11
Resolution Verification11
Radial Alignment Adjustment11
Azimuth Verification12
Index Burst Verification and Adjustment13
Track 00 Sensor Adjustment13
Asymmetry Verification15
Test Point16
Panasonic Alignment Diskette17
Part 2 [Ju-253-T]18
Disassembly and Reassembly18
Removing and Remounting the Cover18
Removing and Remounting the Front Panel Assembly18
Removing and Remounting the Guide Plates18
Removing and Remounting the Holder Assembly and Rollers18
Removing and Remounting the Head FPC, Track 0 Connector, and Stepper Motor Connector19
Removing and Remounting the Head Carriage Assembly, Rod Clamp, and Guide Rod19
Removing and Remounting the Track 0 Assembly20
Removing and Remounting the Stepper Motor20
Removing and Remounting the Trigger Lever Assembly21
Removing and Remounting the Eject Lever Springs21
Removing and Remounting the Eject Lever21
Removing and Remounting the Shield Plate22
Removing and Remounting the Microswitch Assembly22
Removing and Remounting the Mounting Brackets22
Removing and Remounting the Control PC Board23
Removing and Remounting the Drive Motor Assembly23
Disassembling and Reassembling the Mounting Bracketassembly23
Removing and Remounting the Pushbutton24
Disassembling and Reassembling the Holder Assembly24
Mounting the Drive Motor LED24
Disassembly and Reassembly25
Removing and Remounting the Cover25
Removing and Remounting the Front Panel Assembly25
Removing and Remounting the Holder Assembly and Rollers25
Connector25
Removing and Remounting the Head Carriage Assembly, Rod Clamp, and Guide Rod26
Removing and Remounting the Track 0 Assembly26
Removing and Remounting the Stepper Motor27
Removing and Remounting the Trigger Lever Assembly27
Removing and Remounting the Eject Lever Springs28
Removing and Remounting the Eject Lever28
Removing and Remounting the Microswitch Assembly28
Removing and Remounting the Mounting Brackets29
Removing and Remounting the Control PC Board29
Removing and Remounting the Drive Motor Assem M Bly29
Disassembling and Reassembling the Mounting Bracket Assembly30
Removing and Remounting the Pushbutton30
Disassembling and Reassembling the Holder Assembly30
Mounting the Drive Motor LED31
Explodedview1-132
Exploded View33
Exploded View34
Exploded View35
REPLACEMENT PARTS LIST 1-1 Model: JU-253-0N36
REPLACEMENT PARTS LIST 1-2 Model: JU-253-01 P37
REPLACEMENT PARTS LIST 1-3 Model: JU-253-01 PK38
REPLACEMENT PARTS LIST of PCB 2-1 Model : JU-253-01T/-01 P41
Schematic Diagram of Control Board [Ju-253-0H/-01 P]43
Schematic Diagram of Control Board44
Circuit Board45
Circuit Board46

Panasonic JU-253-T

Table of Contents

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