Panasonic JU-475-4

6.3 Trouble Analysis Table
Table 6-2 Trouble Analysis
Item
2
3
4
5
6
7
8
9
10
Trouble
..
Index detection failure
I/O 34pin signal failure
Track 0 detection failure
No head loading
No seek
No
write
No read
Read error
IN USE LED
won't light
Write protect
failure
No.
2
3
4
5
6
7
8
2
2
2
3
4
2
3
2
3
4
5
6
2
3
4
2
3
4
5
6
7
8
9
10
11
12
2
2
Cause
Collet
part faulty
Drive motor control PCB
Drive motor faulty
Index LED faulty
Index detector faulty
Index LED/index detector installation faulty
PCB motor on circuit
PCB index detection circuit
See Item 1.
PCB disk chanQe / ready / Media in / Media out ciuciit
Track 0 assembly
PCB track 0 detection failure
See Item 1.
See Item 2.
Head load solenoid
PCB head load ci rcu it
Stepper motor
Guide shaft contamination or damaQed
PCB stepper driver circuit
See Item 1.
See Item 4.
Head disconnected
Head shorted
Head load bail
height wrong
PCB write circuit
See Item 1.
See Item 4.
See Item 6.
PCB read circuit
See Item 1.
See Item 4.
See Item 7.
Alignment
Azimuth
Index burst
Asymmetry
Limiter
Track 0
Head
load time
Index neriod
PCB read ci rcu it
LED part
PCB IN USE circuit
Write protect part
Write protect circuit
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