Panasonic JB-3300 Technical Manual page 361

5.3
5.4
5.5
5.6
Write Error
If an error occurs during write operation, it is usually detected during the next revolution by performing a read opera-
tion called write check. To correct an error, write again and repeat a write check operation. If the result is unsatis-
factory after ten or more write operations, perform a read operation on another track to determine whether it is the
diskette or the drive that is wrong. If an error persists, replace the diskette and repeat the above procedure.
If the error stil! persists, consider the drive defective. If the error is corrected, dispose of the diskette as defective.
Read Error |
Most read errors are soft errors. Data can be recovered by following the recovery procedure mentionedin 5.2.
Seek Error |
(1) Stepper motor or stepper motordrive 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.
Compatibility Error
The data which is written by one drive may not be read by another. This error is called a compatibility error, which
can be caused mostly by the following. The check points are also mentioned below:
(1) Head misalignment: Refer to (Adjustments and Confirmation Item 9.5)
(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)
6. TROUBLE ANALYSIS
6.1
To determine the cause of trouble whether it lies in the FDD, diskette, or controller, replace the disk and FDD with
good ones. If the FDD is assumed faulty as a result, follow the procedure below.
Trouble Analysis Procedure
FDD trouble may occur in any of the following ten forms.
(1) Index detection failure
(2) Not ready
(3) Track O undetectable
(4) No seek
(5) No write
(6) No read
(7) Read error
(8) IN USE LED won't light.
(9) Write protect undetectable
(10) No head load (5.25 -inch FDD with optional head loader)
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.
V-3