6.3 Trouble Analysis Table
Table 6-2 Trouble Analysis
Item
Trouble
No.
Cause
$.25indh
1
Index detection failure
1
Collet part fa u lty
(Replace...........
2
Drive m otor control PCB
Replace
3
Drive m otor fau lty
_
,
....
4
Index LED fa u lty
Replace
5
Index detector fa u lty
Replace,.......
6
Index LED/index detector installation fau lty
l i l l l i l l l l i l
7
PCB m otor on circuit
Repair
8
PCB index detection circuit
Repair
2
I/O 34pin signal failure
1
See Item 1.
2
PCB disk chanqe/ready /M e d ia in /M e d ia o u tc iu c iit
l i i l i l i i i i i i i i ;
3
Track 0 detection failure
1
Track 0 assembly
, Replace..........
2
PCB track 0 detection failure
Repair
4
No head loading
1
See Item 1.
2
See Item 2.
3
Head load solenoid
, Replace u
4
PCB head load circuit
Repair
5
No seek
1
Stepper m otor
Replace...........
2
Guide shaft contam ination or damaqed
R eplace'""""""
3
PCB stepper driver circuit
Repair
6
No w rite
1
See Item 1.
2
See Item 4.
3
Head disconnected
l i i i i i i i i i i i
4
Head shorted
, Replace......... „
5
Head load bail height w rong
Adjustable
6
PCB w rite circuit
„Repair....... .
7
No read
1
See Item 1.
2
See Item 4.
3
See Item 6.
4
PCB read circuit
8
Read error
1
See Item 1.
„„„„„„„„„
2
See Item 4.
3
See Item 7.
4
A lignm ent
Adjustable.....
5
A zim uth
'Unadjustabie'
6
Index burst
Adjustable.....
7
Asymmetry
Unadjustable
8
Lim iter
Unadjustable
9
Track 0
Adiustab'Je'
10
Head load tim e
Adjustable......
11
Index oeriod
Unadjustable
12
PCB read circuit
„Repair............
9
IN USE LED
w o n 't lig h t
1
LED part
Replace' '
2
PCB IN USE circuit
(Repair.............
10
W rite protect
failure
1
W rite protect part
'Reptace''m,,m,,m
2
W rite protect circuit
Repair
Summary of Contents for JU-475-4
Page 1: ...ORDER NO MSD891122000 Service Manual Flexible Disk Storage Drive JU 475 4 Panasonic ...
Page 6: ...6 2 Troubleshooting Flowchart Table6 1 Troubleshooting Flowchart 4 ...
Page 14: ...10 TEST POINTS Printed Circuit Board Top View GND Vout Vout GND TRK0 TP 8 kJ 1 2 ...
Page 30: ...17 CIRCUIT BOARD JU 475 4AGG Component Side Top 28 TP5 L 6 ...
Page 31: ...CIRCUIT BOARD JU 475 4AGG Solder Side Bottom 29 ...
Page 34: ...Matsushita Communication industrial Co Ltd Memory Systems Division ...