7i92 and china bob - beginner problems?

Hello dear linuxcnc community,

i've just registered here and first like to say hello. 
I'm working with CNC as a hobby mostly and have a small router using GRBL and Arduino as controller.
It's working fine and i'm happy with it so far. But now i'm building a bigger vertical 3 axis CNC for milling slots in window frames and i'd like to have a more robust, professional and faster controller.

The machine is quite simple: 3 motors (JMC servos), 3 limit switches and a water cooled 1.5 kW spindle. The mechanics are some bosch CKK linear modules. So i've chosen linuxcnc and just bought a 7i92M ethernet card. 
LinuxCNC is running fine on a thin client and and talks already with the mesa card. As interface i use a chinese bob. (www.longs-motor.com/breakout-board.html)
I flashed the .bit file to the mesa card for the 5ABOB from: forum.linuxcnc.org/27-driver-boards/30210-mesa-7i92-bit-file

Now my problem: the X-motor runs already on Pin 2 (step) Pin 3 (dir). (wired NPN, so 5V to PUL+ and PUL- to Pin 2)
However the other motors don't. I've attached a probe to Pin 4 (step y) and there are steps coming to the JMC, however i don't seem to get 5V, signals but something lower. More like 1-2V. 
I'm not sure as i'm no electronics specialist, maybe the BOB is defective? I've ordered a 7i78 already for further testing.

Best regards,
minimal3d

Hello tommylight,

thank you for the kind answer:
I will now definitely wait some days for the 7i78 to arrive and replace the china bob by it. 
(I don't plan to wire anything directly to the 7i92: i already know how easy it is to break something...)

Best regards,
minimal3d

Hello,

all the motors turn now.
What i wrote prior was nonsense as i'm a complete newbie with linuxcnc...
The hal file had just all the step timings set too low for Y,Z.
The china bob was then removed and motors wired directly to the 7i92. (picture attached)

Best regards,
minimal3d