Servo control with PICAXE 18X

Hi all,

I am currently working on a GCSE project involving a two wheel drived
robot with a third wheel that will be used for turning. The third
wheel will be controlled using a linkage to a servo. The project board
i am using can be found at the below link.

http://194.201.138.187/epages/Store.storefront/?ObjectPath=/Shops/Store.TechSupplies/Products/CHI035

I am then using a PICAXE 18X chip with this board. The board currently
has two motors attached to the high power outputs and i have removed
the resistor as described in the manual (that can be found on the page
above) so that the high power outputs can be used. The control wire of
the servo is then connected to pin2 and the following code has been
programed onto the PICAXE chip.

loop: servo 2,75 ' move servo to one end
pause 2000 ' wait 2 seconds
servo 2,150 ' move servo to centre
pause 2000 ' wait 2 seconds
servo 2,225 ' move servo to other end
pause 2000 ' wait 2 seconds
goto loop ' loop back to start

This code was taken from the 18X manual which is here

http://robotics.ee.uwa.edu.au/eyejr/pic-controller/PICAXE-manual2.pdf
(see page 78 for servo command details)

Each power supply on the project board was then setup with a 5v power
supply and so was the servo however nothing happened. I double checked
all the connections however i couldnt see anything obviously wrong.
Does anyone know what could be wrong?

Thanks in advance,

James