Troubles w/ pendant PN eeg channel one+/ electrode connection

[Guest guest]

I just started having trouble w/ my pendant PN and the channel

one/electrode connection. I tried different electrodes so I

know the trouble is not w/ the electrode cable but w/ the ch1+

contact/pin

the electrode plugs into. If I fiddle w/ the electrode/ch1+

connection, ie pull or push the electrode into the pendant ch1+ hole,

the

connection will be ok, but it is only in a very small area that the

contact between the pin and electrode seem to connect and produce a

signal similar to that of ch2+ in Bio Explorer. When not in this small

contact

area the signal is practically nil from ch1+ as compared to the ch2+

signal. Does anyone have any idea why this might suddenly be happening

and if so how I might possibly remedy the problem? Thx!