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Old 01-22-2011, 10:06 PM   #1
stevee617
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Default A3000 Rev 7.3 mobo SCSI problems
Did the A3000 Rev 7.0/7.3 motherboard have the backward diode issue?

I have an Apple CD-600e connected & terminated and the computer just sits there with the HD light on and does nothing.

I shut down, turn it off and turn off the CD-Rom, switch the computer back on and it boots right up.

Any ideas?
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Old 01-22-2011, 11:56 PM   #2
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Default Re: A3000 Rev 7.3 mobo SCSI problems
scsi id conflict maybe?
I had that problem with a hard drive but used scsi prefs (i think that is what its called) and set the boot timing to wait for hd spin up. but i think check you scsi id's.
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Old 01-23-2011, 12:35 AM   #3
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Default Re: A3000 Rev 7.3 mobo SCSI problems
I think you're confusing the problems with some of the C= 3640 accelerators which had the problem with reversed caps.

Make sure that the CD and HD have different unit numbers and that your HD isn't terminated.
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Old 01-23-2011, 02:03 AM   #4
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Default Re: A3000 Rev 7.3 mobo SCSI problems
First, check if you have the bugged SCSI CONTROLLER: WD33C93A-PL 00-04 or 00-06
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Old 01-23-2011, 09:17 AM   #5
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Default Re: A3000 Rev 7.3 mobo SCSI problems
Yep, It has the -04 SCSI controller chip in it. Guess I need a -08 SCSI chip.
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Old 01-23-2011, 09:24 AM   #6
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Default Re: A3000 Rev 7.3 mobo SCSI problems
Amiduffer stated:

"Re: A3000 Rev 7.3 mobo SCSI problems
I think you're confusing the problems with some of the C= 3640 accelerators which had the problem with reversed caps.

Make sure that the CD and HD have different unit numbers and that your HD isn't terminated.
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No, there was an issue with some motherboards with the SCSI termination diode, which supplies 5 volts on Pin 25 of the external SCSI port. The diode is installed backward. To make matters worse, the silk screen on the motherboard was even print incorrectly.

I am unsure which motherboards were affected by this.
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Old 01-23-2011, 01:53 PM   #7
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Default Re: A3000 Rev 7.3 mobo SCSI problems
Quote:
Originally Posted by Amiduffer View Post
Make sure that the CD and HD have different unit numbers and that your HD isn't terminated.
Err....

Make sure you've removed the onboard terminators if an external unit is connected. And terminate the devices on the cable ends (internal and external). SCSI requires exactly two terminators sitting on the bus ends.
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Old 01-23-2011, 02:11 PM   #8
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Default Re: A3000 Rev 7.3 mobo SCSI problems
All the on board terminators are removed. The CD-ROm is terminated as well.

I just verified that the CD-ROM is bad, so I think that solves my problem.
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Old 01-23-2011, 02:18 PM   #9
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Default Re: A3000 Rev 7.3 mobo SCSI problems
Ah, the "fun" of A3000 SCSI...

I installed a Buddha.
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Old 01-23-2011, 02:57 PM   #10
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Default Re: A3000 Rev 7.3 mobo SCSI problems
I was having external SCSI problems on my 3000, too, and it turned out to be a weird jumper on the (EDIT: internal) hard drive itself that had to be removed.
Last edited by Matt_H; 01-23-2011 at 03:02 PM..
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