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JU-253-T
Service manual
Panasonic JU-253-T Service Manual
Flexible disk storage drive
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Table of Contents
Introduction
Models and Model Numbers
Special Tools
Outline of Maintenance
Diagnostic Procedures
Error Symptom Recognition
Soft Error Detection and Correction
Write Error
Read Error
Seek Error
Interchangeability Error
Trouble Analysis
Trouble Analysis Procedure
Trouble Shooting Flow Chart
Trouble Analysis Table
Preventive Maintenance
Measurement Items
Adjustments and Verifications
Motor Speed Verification (Index Period)
Write Protect Verification
Output Modulation Verification
Head Output Verification
Resolution Verification
Radial Alignment Adjustment
Azimuth Verification
Index Burst Verification and Adjustment
Track 00 Sensor Adjustment
Asymmetry Verification
Test Point
Panasonic Alignment Diskette
Part 2 [Ju-253-T]
Disassembly and Reassembly
Removing and Remounting the Cover
Removing and Remounting the Front Panel Assembly
Removing and Remounting the Guide Plates
Removing and Remounting the Holder Assembly and Rollers
Removing and Remounting the Head FPC, Track 0 Connector, and Stepper Motor Connector
Removing and Remounting the Head Carriage Assembly, Rod Clamp, and Guide Rod
Removing and Remounting the Track 0 Assembly
Removing and Remounting the Stepper Motor
Removing and Remounting the Trigger Lever Assembly
Removing and Remounting the Eject Lever Springs
Removing and Remounting the Eject Lever
Removing and Remounting the Shield Plate
Removing and Remounting the Microswitch Assembly
Removing and Remounting the Mounting Brackets
Removing and Remounting the Control PC Board
Removing and Remounting the Drive Motor Assembly
Disassembling and Reassembling the Mounting Bracketassembly
Removing and Remounting the Pushbutton
Disassembling and Reassembling the Holder Assembly
Mounting the Drive Motor LED
Disassembly and Reassembly
Removing and Remounting the Cover
Removing and Remounting the Front Panel Assembly
Removing and Remounting the Holder Assembly and Rollers
Connector
Removing and Remounting the Head Carriage Assembly, Rod Clamp, and Guide Rod
Removing and Remounting the Track 0 Assembly
Removing and Remounting the Stepper Motor
Removing and Remounting the Trigger Lever Assembly
Removing and Remounting the Eject Lever Springs
Removing and Remounting the Eject Lever
Removing and Remounting the Microswitch Assembly
Removing and Remounting the Mounting Brackets
Removing and Remounting the Control PC Board
Removing and Remounting the Drive Motor Assem M Bly
Disassembling and Reassembling the Mounting Bracket Assembly
Removing and Remounting the Pushbutton
Disassembling and Reassembling the Holder Assembly
Mounting the Drive Motor LED
Explodedview1-1
Exploded View
Exploded View
Exploded View
REPLACEMENT PARTS LIST 1-1 Model: JU-253-0N
REPLACEMENT PARTS LIST 1-2 Model: JU-253-01 P
REPLACEMENT PARTS LIST 1-3 Model: JU-253-01 PK
REPLACEMENT PARTS LIST of PCB 2-1 Model : JU-253-01T/-01 P
Schematic Diagram of Control Board [Ju-253-0H/-01 P]
Schematic Diagram of Control Board
Circuit Board
Circuit Board
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ORDER NO. MSD870909100
ervice Manual
Flexible Disk Storage Drive
3.5 Inch
JU ·253· T/J U·253·P/J U·253·PK
•
IC
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This manual is also suitable for:
Ju-253-p
Ju-253-pk
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