## How to check C-SUM

- Check from main panel

> Turn off radio then turn on while pressing [NR] + [MIC] keys.

> Sound like some switches then you will see main CPU C-SUM in main frequency area and DSP C-SUM in sub frequency area.Main CPU C-SUM is 4 digits (ie 2EA9). DSP C-SUM is 8 digits (ie 116543df).

> Use MULTI CH to chenge display.

> PANEL DISPLAY | AT
> Diaplay C-SUM | MAKE
> All LCD segments display | RELEASE

- Check from RC-2000

> Turn off radio then turn on while pressing [F4] + [F5] keys.

> Sound like some switches then you will see main CPU C-SUM in main frequency area and DSP C-SUM in sub frequency area.Main CPU C-SUM is 4 digits (ie 2EA9). DSP C-SUM is 8 digits (ie 116543df).

> > Use MULTI CH to chenge display.

> > PANEL DISPLAY | AT
> > Diaplay C-SUM | MAKE
> > All LCD segments display | RELEASE