Try this one:
Sub test()
Dim x As Shape
Set x = ActiveSheet.Shapes("Chart 1502")
With x.Chart.ChartArea.Format.TextFrame2.TextRange.Font
.NameComplexScript = "Arial"
.NameFarEast = "Arial"
.Name = "Arial"
End With
End Sub
I also suggest to change ActiveSheet.Shapes("Chart 1502")
to something like this: Worksheets("Sheet1").Shapes("Chart 1502")
.