Icom IC-3230H (IC 3230 H IC3230H) transceiver mods reviews software and diagrams

If you look at the IC-3220 repeater mod on this site, you will find a mod that will also work with the IC-3230.

It states that holding down the "set" and "band" buttons for a couple of seconds will cause the 2 "L's" to blink.
This will place the Icom 3230 into crossband repeater mode just as it does with the IC-3220.

I tried this and it works with my IC-3230. I'm not sure whether it is stated in the 3230 manual since it is so large and I did not come accross it.