Rule 120 - Attorneys - Appearances And Withdrawals(a) Counsel representing a defendant shall file a written appearance in all cases in the office of the Clerk of Courts at or before the time of arraignment. A written appearance shall be filed as soon as possible if employment follows arraignment. A copy of any such written appearance shall be forwarded to the District Attorney's office as required by these rules.(b) The signing of a Criminal Case Scheduling Form (Form L502) or waiver of arraignment by defense counsel or representative or the endorsement of an information or appointment pursuant to Pa.R.Crim.P. 122 shall constitute a written appearance.