Password for a system extension with a Windows N repeater

Hi, I have 2 x RBR50 units connected to my Sky router. Need additional coverage and purchased a generic repeater. The desktop I am attempting to use is at the farmost point in my network coverage so I already had a 'generic' Wireless N repeater.

the system has detected the operating repeater and sees a strong signal but it will not connect without a password.

I have a password which has worked perfectly when connecting other devices to the network but the same password is not recognised by the new connection Orb02_Ext.

No other passwords make the connections (eg ADMIN, or Fr2002(network central), nor Fr2001(e))

Is there a master default password I can try?

Any and all advice much appreciated

Wallace Briggs