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INDUS GT Field Service Manual Chapter 3
DIAGNOSING A PROBLEM
3.1 WHAT TO DO FIRST Before you actually try to repair a defective disk drive, you should try to get some idea as to what is wrong with it. The first thing to do is read the service report (if any) to see if you can isolate the probable cause of the defect. Next, you should give the drive a good close visual inspection. Note any obvious defects and determine whether they need repair or not. Finally, before you disassemble the disk drive, go through this inspection checklist: 1. Inspect the power and I/O connectors. Make sure that they are properly installed and that they have no broken pins. Also make sure that their mating cables plug in properly. 2. Verify that the dust cover lifts smoothly and that the front latch opens and closes easily. The head arm should lift when the front latch is open. 3. Verify that a diskette can be easily inserted and removed from the drive. 4. Take the main housing off of the drive and make sure that all of the circuit board connectors are properly seated and have no broken wires. 5. Check for any loose or missing hardware. 6. Manually rotate the drive hub. It should rotate freely. 7. Check the circuit boards for any damaged or missing components. 8. Attach an INDUS power supply to the drive and turn the power ON. The LED display should flash through a series of codes beginning with 'C’, then stop on track 00 for a few seconds, and finally come to rest on track 39. The drive motor should come ON during his sequence and turn OFF at the end. Note any deviation from this sequence.
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