[chirp_users] repeater programming on UV5R

I am having a problem programming a couple of my local 70cm repeaters into my baofang UV5R. The problem is that I can access the repeater but although the repeater responds, as indicated by the green light being lit, I hear no audio. This is because R-CTCss is set to on. These two repeaters do not transmit a CTCss tone so I need to program R-CTCSS off on the radio but so far I have been unsuccessful in doing this! Manually loading the repeater into the radio it all works fine, just using a memory channel programmed with Chirp. It is just two repeaters that give probs. all others are OK.

So question is how do I program the R-CTCss off for these two memory channels, but leave T-CTCss active of course.

Martin G3ZQU.