I used to own Jensen cd player for a while but I can't remember the solution of loop loading. Check Jensen cd-players manuals http://jensen.manymanuals.com/cd-players
You need to review the audio setting! Check the cables behind device, (audio one) then make sure it is connected with proper one on the plastic connector! Good luck
While the machine is on, put the old toner back into the machine, close the front cover. Open the front cover and replace it with the new toner. Make sure new toner is shake well.
Ground - negative 12v positive - switchable positive (for example, on when ignition is on, usually connected to accessory side on ignition switch) auto ant - connected to your electric antenna or to turn on external amplifier. Memory - connected to always on positive (to keep all your stereo presets )