All Dynamics SL menu items that print something whether it be a report or a check do that using reports created in Crystal Reports. You did not directly specify but I am assuming you are talking about AP checks. There are several different reports involved with AP checks depending on which report format you select. All of the AP check report names are of the format 03620x. For example, the laser check form report is 03620L and the multi-stub report is 03620S. You can determine the exact report name by going to Administration and opening the report control menu item and then enter the report number (03620 for AP).
Once you have determine which report is being used, launch Crystal Reports (not sure why you stated management Reporter since that is a different tool for creating financial statements) and open the specific report name. All the AP reports will be in the AP folder but you should also look in the Usr_Rpts folder because that is where customized version of standard reports should be stored. SL always looks in this folder first when launching a report.
When you have the report definition open in Crystal select File and then Printer Setup. In the upper left corner is the No Printer option.