I have a jensen JR300 I need the key function diagram because the letters on the buttons have worn off

RC Programming Your Jensen JR300 Remote Control

Should be one of these codes:
Hitachi 0056, 0145, 0016, 0151

Link to the codes for Jensen Jr-300 remote.
http://www.remotecentral.com/features/r-jr300.htm

go to www.jensen.com and download the codes is free.

Link to codes for Jensen JR300 remote:
http://www.remotecentral.com/features/r-jr300.htm

Codes for Magnavox:
Magnavox 0054, 1254, 0030, 0179, 0187

Sansui TV codes:
Sansei 0451 Sansui 0463
Link to more codes if you need it:
http://www.remotecentral.com/features/r-jr300.htm

Keys look like this , so I will list them in such -
---
-

TV
CABLE/SATELLITE/ANT, AUD(IO) , VCR
DVD
http://mine.remotecentral.com/cgi-bin/files/dl.cgi?file=others/jensen/jr300-400-500-manual.zip&area=other

HOW TO PROGRAM this remote is in the manual. You can download the manual instructions with codes for FREE at:
http://www.replacementremotes.com/Jensen-Advent-Manuals/Download-FREE-JR300-JR400-JR500-MANUAL-OPERATING-MANUAL.html

i have a jensen 400 c remote controle and i lost my manual for it, so i need the codes for it.

You actually do not require the number to program this remote. If you hold down the component you are wanting to link it to eg. TV and press the power button for 3 seconds the on/off button will stay lit. Once the on/off button is lit, you then just press the on/off button until the unit turns off. You then press the stop button at the bottom. You should be able to turn your TV on now!