Typically, no--community service is generally given as an alternative in appropriate cases to prison or jail time, not to a fine. Fines, especially in motor vehicle (e.g. speeding) cases have to be paid, though you may be able to get the court to accept a payment plan allowing you to pay over time, if you can demonstrate your financial difficulty. On the day of trial, discuss this with the prosecutor and judge, though you can try discussing it with the clerk in advance--though in my experience (in NJ), the clerk does not have the authority to grant a payment plan, and you'd need to appear in court to request one.