Only if the door were open. The 4-2-3-1, when locked, only displayed sales data. You had to pop the T-handle open and push another button to go into Service Pro

Only if the door were open. The 4-2-3-1, when locked, only displayed sales data. You had to pop the T-handle open and push another button to go into Service Programming to actually set prices with the front-panel buttons. At the same time, all my local vending machines were dispensing with the old tubular locks - they all went to funky keyless remotes to unlock machines.