Setup of the Apple 2 16K memory card - anyone know??

[CuteGirl@noboy.ca (CuteGirl)]

Hello there,

I have an apple II with a 16k card. The card used to work ONLY after
being in the computer for an hour or so (to warm up?!) and now does
not work at all. There is a variable resistor ('pot') on the top that
can be moved 1/2 turn, labled VR1. Is there any setup for this card
with this or other parts? I have a full lab available with 'scope, but
have no idea where to begin, and just maybe there is some instructions
outthere. Otherwise, maybe I can find someone with one to sell in the
Toronto area... hehe!  TIA!

<j>