Kenwood TK-830 what is the mod for 10 KC step on this radio

[JONSKY]

Have TK-830 but cannot tune to exact frequency, tried everything, I've check the help files on KPG7D software and saids there for 10.0 khz steps it needs modification, tried special tune but no help, I tried to change the IF frequency on the RSS by holding SHIFT + F6 key , RSS will accept the frequency you typed in but radio dont. Just gives a contant tone of death and flashing display. you can program 448.2625 and works well but not 448.2600