The mPOP has a maximum withstanding load of 17 lbs. A heavy load placed on the mPOP may prevent the cash drawer from opening.
To open the cash drawer manually, use the multi-function button or lock release lever. If your mPOP is connected to a power source, use the multi-function button.
Push to release printer
Push the front face of the printer to unlock [1 in the diagram below] and pull out the printer .
Open cash drawer
Press and hold  the multi-function button [a] for 5 seconds to open the cash drawer.
If your mPOP isn't connected to a power source, use the lock release lever.
Lift printer and open cash drawer. Remove your mPOP unit from any brackets or mounting kit.
Lift the mPOP from bottom right  and locate the lock release lever located at the back, on the underside of the mPOP .
Insert the tip of a pen, or something slim, into the lock release lever. Slide your pen towards the front of the mPOP  and the cash drawer will open.