Tandy 1400LT Service Manual page 248

2-2-2 Write Error
To determine whether the disk or the drive is failing, the disk should be replaced by R e a d m r i t e Disk and check
that there still exists write error.
If write error does not exist any more, remove the old one.
If write error exists with use of any disk, drive might cause write error.
2-2-3 Seek Eerror
Seek error comes from:
1) Heads movement is incorrect because electrical noise jumps into signal.
2) Heads driving system might be at fault.
If it is not re-readable after recalibration, drive might be at fault.
2-2-4 Interchange Error
If data written on one drive is readable correctly on another drive, but not by other drives, interchange error exists.
Interchange errors are caused by:
1) Heads are not properly positioned.
2) Motor speed is not correct.
3) Optimum head output level and offset and head compliance are not obtained.
4) Chucking mechanism does not work.
D-3