IBM 6644, 6645, 6646 manual CNN1, CD-ROM Drive

Table 2-3 Error Symptoms List (Continued)

NOTE: To diagnose a problem, first find the error symptom in the left column. If directed to a check procedure, replace the FRU indicated in the check procedure. If no check procedure is indicated, the first Action/ FRU listed in right column is the most likely cause.

Error Symptoms		Action/FRU
Hard disk drive format error.	Enter BIOS Setup and Load
	default settings.
	Hard disk drive cable.
	Hard disk drive.
	System board.
Hard disk drive write error.	Enter BIOS Setup and Load
	default settings.
	Hard disk drive.
Hard disk drive LED fails to	With the system power on,
light, but system operates	measure the voltage of hard
normally.	disk LED connector CNN1.
	The reading should be:
	CNN1	HDD Idle/ Active
	pin-8	+5 Vdc / --
	pin-7	+5 Vdc / 0
	Vdc
	See “System Board
	Jumpers and Connectors”
	on page 105.
	Hard drive LED cable.
CD-ROM Drive

NOTE: Ensure CD-ROM drive is configured correctly in BIOS Setup, cable/jumper are set correctly and its laser beam is clean before diagnosing any CD-ROM drive problems.

CD-ROM drive LED flashes	CD may have dirt or foreign
for more than 30 seconds	material on it. Check with a
before LED shut off.	known good disc.
Software asks to reinstall	CD is not inserted properly.
disc.	CD is damaged.
Software displays a reading
CD error.
CD-ROM drive LED doesn't	CD-ROM drive
come on but works
normally.

50 IBM Desktop System HMM