Read Error; Seek Error; Interchangeability Error; Trouble Analysis - Panasonic JU-253-T Service Manual

5.4 Read Error
Most read errors are soft errors. Data can be recovered by following the recovery procedure mentioned in
5.2.
5.5 Seek Error
(1)
Stepper motor or stepper motor drive circuit is faulty.
(2) Faulty carriage
There are two ways of seek error recovery. One is to recalibrate to track 00 , and seek back to the
original track. The other is to read the ID field, check the track number on which the head is located,
and move the head away from it. And read it again.
5.6 Interchangeability Error
Data which is written by one drive may not be read by another. This error is called a Interchange-ability
error,which can be caused mostly by the following reason, which should be checked as follows.
(1) Head misalignment: Refer to Adjustments and Confirmation Item 9.6
(2) Head output too low: Refer to Adjustments and Confirmation Item 9.3
(3) Motor speed difference: Refer to Adjustments and Confirmation Item 9.1
(4) Format difference
6. TROUBLE ANALYSIS
FDD trouble may occur in any of the following nine forms.
(1) Index detection failure
(2) Not ready
(3) Track 0 undetectable
(4) No seek
(5) Nowrite
(6) No read
(7) Read error
(8) IN USE LED won't light.
(9) Write protect undetectable
Check with the troubleshooting flowchart in 6.2
CAUTION:
Be sure to switch power off before removing an FDD or PCB from the operating system.
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