1. Is the cash drawer plugged directly into the Star TSP100 printer?
a. The cash drawer hooks up to receipt printer using a cord that looks like an only phone cord. It has 6 copper leads. This rarely comes undone, but it is good to check.
b. If it does not have 6 copper leads, then they have the wrong cord
2. Is the key slot vertical?
The key slot must be in the vertical position for it to open after a transaction.