I am not sure why an employee would be writing a check to the company, but in any event, unless I knew the person was in dire financial straits, or had a sick child and couldn't work or whatever, no I absolutely would not be contributing to someone begging at work for money to "fix" their bounced check, nor would I ever beg at work.
I have had occasion to contribute to a bake sale for colleagues who have been hit with serious illness and would be out of wrk for a long time, but those are always organized by others, not the person themselves, and that's an understandable reason for doing fundraising IMHO.