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5.4
Read Error
Most read errors are soft errors. Data can be recovered by fo llo w in g the recovery procedure in
section 5.2.
5.5
Seek Error
Seek errors are caused by the fo llo w in g.
(1)
Stepper m otor or stepper m otor drive circuit is faulty.
(2)
Faulty Carriage
There are tw o ways to recover from a seek error. One is to recalibrate to track 0, and seek
back to the original track. The other is to read the ID field, check the track number on w hich
the head is located, and move the head away from it. Read it again.
5.6
Interchangeability Error
Data w hich is w ritte n by one FDD may n o t be read by a n o th e r.
This e rro r is called a
interchangeability error, which can be caused mostly by the fo llo w in g reasons, which should be
checked as follow s.
(1)
Head m isalignment: Refer to Adjustments and C onfirm ation section 9.6.
(2)
Head o u tp u t to o low : Refer to C onfirm ation section 9.3.
(3)
M o tor speed difference: Refer to Adjustments and C onfirm ation section 9.1.
(4)
Format incom patibility.
6. TROUBLE ANALYSIS
To determine the cause o f trouble w hether it lies in the FDD, diskette, or controller, replace the
diskette and the FDD w ith good ones. If the FDD is assumed fa u lty as a result, fo llo w the
procedure below.
6.1
Trouble Analysis Procedure
FDD trouble may occur in any o f the fo llo w in g ten forms.
(1)
Index detection failure
(2)
I/O 34pin signal failure (Disk C hange/R eady/M edia In /M e d ia Out)
(3)
Track 0 undetectable
(4)
No seek
(5)
No w rite
(6)
No read
(7)
Read error
(8)
IN USE LED w o n 't light.
(9)
W rite protect undetectable
(10) No head load (5.25inch FDD w ith optional head loader)
Check w ith the troubleshooting flo w ch art in section 6.2.
CAUTION:
Be sure to switch the power o ff before removing an FDD or PCB from the operating system.
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Содержание JU-475-4
Страница 1: ...ORDER NO MSD891122000 Service Manual Flexible Disk Storage Drive JU 475 4 Panasonic ...
Страница 6: ...6 2 Troubleshooting Flowchart Table6 1 Troubleshooting Flowchart 4 ...
Страница 14: ...10 TEST POINTS Printed Circuit Board Top View GND Vout Vout GND TRK0 TP 8 kJ 1 2 ...
Страница 30: ...17 CIRCUIT BOARD JU 475 4AGG Component Side Top 28 TP5 L 6 ...
Страница 31: ...CIRCUIT BOARD JU 475 4AGG Solder Side Bottom 29 ...
Страница 34: ...Matsushita Communication industrial Co Ltd Memory Systems Division ...