Com 226 comp trouble shooting II theory book
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| Preliminary Testing Proper testing is essential for any type of drive repair. Most drive-alignment packages,such as DriveProbe by Accurite Technologies or AlignIt by Landmark Research, measure and display a drive’s parameters (Fig. 16-10). When floppy drive trouble occurs, running a diagnostic can help determine whether the drive mechanics or electronics are at fault. Although you can swap a drive symptomatically, thorough testing is an inexpensive means to verify your suspicions before spending money to replace sub-assemblies. Symptom 16-1. The floppy drive is completely dead The disk does not even initialize when inserted. Begin troubleshooting by inspecting the diskette itself. When a 3.5” disk is inserted into a drive, a mechanism should pull the disk’s metal shroud away and briefly rotate the spindle motor to ensure positive engagement. Be sure that the disk is properly inserted into the floppy-drive assembly. If the diskette does not enter and seat just right within the drive, disk access will be impossible. Try several different diskettes to ensure that the test diskette is not defective. It might be necessary to partially disassemble the computer to access the drive and allow you to seethe overall assembly. Free or adjust any jammed assemblies or linkages to correct disk insertion. If you cannot get diskettes to insert properly, change the floppy drive. 580 Floppy Drives For cleaning and testing your floppy drive, checkout AUTOTEST.ZIP, CHKDRV.ZIP, CLEAN4.ZIP, and DFR.ZIP on the companion CDSymptom 16-2. The floppy drive rotates a disk, but will not seek to the desired track This type of symptom generally suggests that the head-positioning stepping motor is inhibited or defective, but all other floppy-drive functions are working properly. Begin by disassembling your computer and removing the floppy drive. Carefully Download 1.89 Mb. Share with your friends:
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