How do you hook up gemini xl 300 turntables to a gemini pmx 500 mixer

Look at the cartridge make and model number fitted. Put that into Google and the type of stylus needed will show up.

how to fix a target switch on a gemini xl500ii

http://media.musicalplanet.com/pdf/GMN041.PDF

Here
http://www.stylusplus.co.uk/gemini-xl-500-mk-ii-record-player-stylus-8489-p.asp

Maybe this will be of help?
http://www.lpgear.com/Merchant2/merchant.mvc?Screen=PROD&Store_Code=LG&Product_Code=GEMSXL500II

No! The amp must have a magnetic cartridge pre-amp to increase the sound level. If it has one it will say "phono" on the inputs on the back and have a "turntable" - or "Phono" selector switch. If it doesn't have one (many new surround amps don't) you won't be able to play it properly untill you get a "magnetic cartridge pre-amp". This will make the signal loud enough to be used on a normal aux imput of the Sony.

if there is a slot for a power cord on the turntables them selves then yes you need the power cords

on top of the pitch control there is a small hole, in this hole you can use a small screw driver  and turn it left and right to free any dirt inside this is the master pitch control

You will need a phono preamp. Ipods, radios and cd players all give out a LINE level signal..which means you can plug headphones or speakers, adjust volume and be set. A turntable needs a phono preamp. Usually a dj mixer or stereo receiver with a phono input is all that is needed. A simple phono pre amp is like $20 from radio shack.

keep me posted.

Here you go: xg-2000: http://www.geminidj.com/disc._prod_manuals/AMPS/XG-2000/XG-2000.pdf PMX-3501: http://www.geminidj.com/disc._prod_manuals/MIXERS/PMX-3501/PMX-3501.pdf Hope this is what you want