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JU-253-T
Panasonic JU-253-T
48 pages
Manual
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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
2
Table of Contents
Main Page
Table of Contents
2
Introduction
4
Models and Model Numbers
4
Special Tools
4
Outline of Maintenance
5
Diagnostic Procedures
5
Error Symptom Recognition
5
Soft Error Detection and Correction
5
Write Error
5
Read Error
6
Seek Error
6
Interchangeability Error
6
Trouble Analysis
6
Trouble Analysis Procedure
6
Trouble Shooting Flow Chart
7
Trouble Analysis Table
8
Preventive Maintenance
9
Measurement Items
9
Adjustments and Verifications
10
Motor Speed Verification (Index Period)
10
Write Protect Verification
10
Output Modulation Verification
10
Head Output Verification
11
Resolution Verification
11
Radial Alignment Adjustment
11
Azimuth Verification
12
Index Burst Verification and Adjustment
13
Track 00 Sensor Adjustment
13
Asymmetry Verification
15
Test Point
16
Panasonic Alignment Diskette
17
Part 2 [Ju-253-T]
18
Disassembly and Reassembly
18
Removing and Remounting the Cover
18
Removing and Remounting the Front Panel Assembly
18
Removing and Remounting the Guide Plates
18
Removing and Remounting the Holder Assembly and Rollers
18
Removing and Remounting the Head FPC, Track 0 Connector, and Stepper Motor Connector
19
Removing and Remounting the Head Carriage Assembly, Rod Clamp, and Guide Rod
19
Removing and Remounting the Track 0 Assembly
20
Removing and Remounting the Stepper Motor
20
Removing and Remounting the Trigger Lever Assembly
21
Removing and Remounting the Eject Lever Springs
21
Removing and Remounting the Eject Lever
21
Removing and Remounting the Shield Plate
22
Removing and Remounting the Microswitch Assembly
22
Removing and Remounting the Mounting Brackets
22
Removing and Remounting the Control PC Board
23
Removing and Remounting the Drive Motor Assembly
23
Disassembling and Reassembling the Mounting Bracketassembly
23
Removing and Remounting the Pushbutton
24
Disassembling and Reassembling the Holder Assembly
24
Mounting the Drive Motor LED
24
Disassembly and Reassembly
25
Removing and Remounting the Cover
25
Removing and Remounting the Front Panel Assembly
25
Removing and Remounting the Holder Assembly and Rollers
25
Connector
25
Removing and Remounting the Head Carriage Assembly, Rod Clamp, and Guide Rod
26
Removing and Remounting the Track 0 Assembly
26
Removing and Remounting the Stepper Motor
27
Removing and Remounting the Trigger Lever Assembly
27
Removing and Remounting the Eject Lever Springs
28
Removing and Remounting the Eject Lever
28
Removing and Remounting the Microswitch Assembly
28
Removing and Remounting the Mounting Brackets
29
Removing and Remounting the Control PC Board
29
Removing and Remounting the Drive Motor Assem M Bly
29
Disassembling and Reassembling the Mounting Bracket Assembly
30
Removing and Remounting the Pushbutton
30
Disassembling and Reassembling the Holder Assembly
30
Mounting the Drive Motor LED
31
Explodedview1-1
32
Exploded View
33
Exploded View
34
Exploded View
35
REPLACEMENT PARTS LIST 1-1 Model: JU-253-0N
36
REPLACEMENT PARTS LIST 1-2 Model: JU-253-01 P
37
REPLACEMENT PARTS LIST 1-3 Model: JU-253-01 PK
38
REPLACEMENT PARTS LIST of PCB 2-1 Model : JU-253-01T/-01 P
41
Schematic Diagram of Control Board [Ju-253-0H/-01 P]
43
Schematic Diagram of Control Board
44
Circuit Board
45
Circuit Board
46
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Panasonic JU-253-T Specifications
General
Type
Floppy Disk Drive
Capacity
1.44 MB
Rotation Speed
300 RPM
Average Access Time
94 ms
Data Transfer Rate
500 Kbit/s
Form Factor
3.5 inch
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