Focusrite ISA220 Session Pack Drawings - Ive messed up my +48v phantom power

[DigitalMetal]

Hi,
Would anyone happen to have drawings for the Focusrite ISA220 Session pack?
Ive stupidly plugged up an already phantom powered source to mine and now if i engage the +48v i get a loud hum and no sound from the mic.
Ive checked and there is still 48V being switched to pins 2 and 3 of the XLR Mic input but im not sure what ive blown and where this hum is coming from,
I can use a separate battery powered phantom power unit with the ISA220's 48v switched off or a dynamic mic ok but i would really like to fix the ISA's 48v.
Can anyone offer any assistance or a drawing for this unit?

Heres a photo of some surface mounted components next to the XLR mic input (the lower one in the picture) but im not sure how im going to be able to test them.

http://imageshack.us/a/img28/9863/isa220.jpg

Thanks to anyone who can help me out!

Neil

 

[mrclunk]

Thought i had a session pack schem but i can't find it.
However looking at the Red 6 circuit it looks like there's some switching of the xlr input GND (pin 1) connection when +48V is engaged.

On the Red  i think its a two pole relay, one pole switching in the 48V and one switching the gnd. That phantom gnd not switching may be the cause of the hum?