How do you know that it has "passive" termination? Does it have several terminator resistor blocks like that black SIL package at position RN1 in the picture?
Yours look to me more like this one (no terminator resistors)
The more I think about it, the more it looks that your problem might be even bigger. What 80-pin SCA drive is it that you have? Wide or Narrow? What's the model number? If it's Wide, then you have to terminate remaining 9 signal lines on the drive as well to allow it to run on Narrow bus. In fact, that SCA-TERM adapter in top picture does just that. There's a chance that your drive still might work without terminating those extra 9 lines, but it also might not. It depends on a lot of circumstances. Correct way to do it would be to terminate them. Using SCA drives on Narrow bus is tricky, better to stay away from them, if you're not a SCSI expert.
Check the links I provided in my post above.
More info also at: http://tinyurl.com/bsklufj