1. Create two price lists. The first price list sets the default charge for copy/print jobs to 0.00. The second price list sets the desired charge for copy/print jobs at these specific devices. Apply the first price list to all non-charge devices. Apply the second price list to these specific devices and any e-queue that contains them.
2. Create a rule to deny print jobs if "Account balance after the job would be less than specified" and apply it at these devices or e-queues.
3. Create a Scheduled task to "Set account balances." Set the task type to "Deposit to minimum level." The amount should be greater than zero but less than the desired charge for a 1 page print job on one of this device. Configure this scheduled task to run on a daily basis. This scheduled task will adjust only accounts with zero and negative balance.
4. Enable "Enforce Accounts Limits" in System Manager.