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I don't know someone see this thread, but I did it! I tried trace the board with the Bolle given me schematics. I know this is not rational trace way. I switched on while praying. and it works!! now my SE/30 can read the internal SCSI HDD, and booted! Thanks for all advices in this...

I did several tests on SE/30 board. firstly, Internal and external SCSI pins are not connected to SCSI chip. but internal SCSI and external SCSI pins are connected. so I will try solder internal SCSI pins to SCSI chip. I think maybe both SCSI connector is works if solder is succeed.

I tried one more time with that picture. also not connected red marked pins. How to connect these nicely...? Please teach me recommend method. [:(]

Is this chip pin assignment is same as the picture? this picture is came from maybe different chip company document as mine. I couldn't find for my SE/30's SCSI controller assignments...

Ugh...I'm not good at tracing...  :sadmac: I think I must buy SD2SCSI devices. so maybe I'll buy it soon.

This may not be the answer, I tried trace the board with my cheap multimeter. blue is beep, Orange is nothing. But I can't understand this result means. (sorry I forgot line 36. it is blue)

Thank you for reply! I'm not sure this is a SCSI chip...

Thank you for reply! I used seagate HD (originally installed Macintosh LC. I don't know is this working correctly)  Maxtor HD (originally installed accelerated Mac SE and it worked before 2 month ago) Apple's official 40MB HD (I don't know is this working correctly) all HDs are can...

Hi everyone. I'm not English speaker so maybe I can't tell about some problems nicely. sorry about it. Few days ago I bought Macintosh SE/30 with no HDD. it looked some leaking capacitors on the motherboard, so I remove capacitors and then clean the motherboard with dishwasher and dry it out...