Datamax-O'Neil MP Compact4_MP Compact4 Mobile Mark II Operators Manual - Manual (Page 9)

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Power Connections
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Before connecting Power or interface cables to the printer, ensure the Power On/Off Switch is in the
‘Off’ position.
 Place the printer on a firm, level surface.
 Ensure that the Power Switch on the Printer is in the ‘Off’ position.
AC Model
 Connect the AC Power Cord to the receptacle on the back of the Printer, and then plug the AC Power
Cord into a properly grounded outlet. (The printer’s power supply automatically detects and then
adjusts to the applied line voltage; see Appendix A for the acceptable voltage ranges.)
DC Model (24VDC to 48VDC)
 Connect the Black wire to the negative (-) pole of the battery or chassis ground. Connect both red
wires to the positive (+) pole of the battery.
 Connect the white input connecter to the rear of the printer as shown. (The printer’s power supply
automatically detects and then adjusts to the applied voltage; see Appendix A for the acceptable
voltage ranges.)