IBM JS20 Hardware Maintenance Manual - Page 157

Diskette drive problems Symptom FRU/action Diskette drive activity LED stays 1. If there is a diskette in the drive, verify that: on, or the system bypasses the v The diskette is inserted correctly in the drive. diskette drive. v The diskette is good and not damaged - the drive light comes on (one-second flash) when the diskette is inserted (try another diskette if you have one). v The diskette contains the necessary files to start the computer. v The software program is working correctly. v The cable is installed correctly (in the proper orientation). 2. To prevent diskette drive read/write errors, be sure the distance between monitors and diskette drives is at least 76 mm (3 in.). 3. Cable. 4. Run diskette drive diagnostics. 5. Diskette drive. 6. Media tray card. General problems Symptom FRU/action Problems such as broken cover v Broken CRU/FRU locks or indicator LEDs not working Hard disk drive problems Symptom FRU/action Not all drives are recognized by 1. Remove the first drive not recognized and try the hard disk drive the hard disk drive firmware or diagnostic test again. operating system. 2. If the remaining drives are recognized, replace the drive you removed with a new one. System stops responding during 1. Remove the hard disk drive being tested when the computer stopped hard disk drive operating responding and try the diagnostic test again. system commands to test or look for badblocks. 2. If the hard disk drive diagnostic test runs successfully, replace the drive you removed with a new one. Chapter 10. Symptom-to-FRU index 147