I'm not familiar with Samsung cameras and whether you need to have it in a certain remote capture setting, but most firewire capture issues I've had in the past were due to bad cables or a flaky port on the device. Two Sonys I've dealt with in the past few years needed to have new fw ports installed, a not-cheap repair.
The same tape plays and captures in my good Sony.
So use that.
The other purpose was to buy a cheap slave to transfer tapes.