A: To get the Guardian coin mech to accept 5c coins, the scaling factor needs to be changed, by default it is set to 10. It needs to be set to 5 so it can accept the 5c coin, to do this enter the Guardian menu system by pressing the menu button.

The display will show Main Menu Audit, press the down arrow (B) button to get to Setup, press Enter (C) button the display will now show Setup Float, press the up arrow (E) twice to get to General, press Enter.

The display will show General Autotest, press the down arrow (B) button to get to MDB Settings, press Enter (C) button.

The display will now show MDB Level, press the down arrow (B) button to get to Scale Factor, press Enter (C) button.

The display will now show Scale Factor 10, press the down arrow (B) button five times to get to Scale Factor 5, press Enter (C) button the display will now return to the default display.

After this reset the vending machine (turn off/on) and test 5c coins. If it still doesn't accept them, it is possible the vending machine has a setting that may need to be changed. (Eg. on the Merlin 4 Royal drink vender the cheat mode needs to be enabled.)