Dim db As Database
Dim rs As Recordset
Dim rCount As Integer
Dim cnt As Integer
rCount = 0
Set db = CurrentDb ' What is "Printed Checks"(); Your Db?
Set rs = db.OpenRecordset("Table")
rs.MoveLast
rCount = rs.RecordCount
rs.MoveFirst
Do Until rs.EOF
rs.Edit
rs.Fields("Checkboxfield") = CheckBox.Value
rs.Update
rs.MoveNext
Loop