Trouble Analysis Table - Panasonic JU-475-4 Service Manual

6.3 Trouble Analysis Table

Item Trouble
Index detection failure
1
2 I/O 34pin signal failure
Track 0 detection failure
3
4 No head loading
5 No seek
6 No w rite
7 No read
8 Read error
9 IN USE LED
w o n 't lig h t
W rite protect
10
failure
Table 6-2 Trouble Analysis
No.
Collet part fau lty
1
2 Drive m otor control PCB
3 Drive m otor faulty
4 Index LED fa u lty
5 Index detector fau lty
6 Index LED/index detector installation faulty
7 PCB m otor on circuit
PCB index detection circuit
8
1 See Item 1.
2 PCB disk chanqe/ready /M e dia in /M e d ia o u tc iu c iit
1 Track 0 assembly
2 PCB track 0 detection failure
1 See Item 1.
2 See Item 2.
3 Head load solenoid
4 PCB head load circuit
1 Stepper m otor
2 Guide shaft contam ination or damaqed
3 PCB stepper driver circuit
1 See Item 1.
2 See Item 4.
3 Head disconnected
4
Head shorted
5 Head load bail height wrong
6 PCB w rite circuit
1 See Item 1.
2 See Item 4.
3 See Item 6.
4 PCB read circuit
1 See Item 1.
2
See Item 4.
3 See Item 7.
4 A lignm ent
5 Azim uth
6 Index burst
7
Asymmetry
Limiter
8
9 Track 0
10 Head load tim e
11 Index oeriod
12 PCB read circuit
1
LED part
2
PCB IN USE circuit
1 W rite protect part
2 W rite protect circuit
Cause $.25indh
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Unadjustable
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Repair