The diodes D12 to D20 and D10 + D8 on the logic board is the diodes that control frequencyrange and model version. 

                            [Logic board]
-----------------------------------------------------------------------------------+
                                                                      ------       |
                                                                       W1          |
                                                                                   |
                                                                                   |
                     J 7                    D14       D15       D12       D13      |
     +-------------------------------+     +----+    +----+    +----+    +----+    |
     |                               |     |    |    |    |    |    |    |    |    |
     |                               |     +----+    +----+    +----+    +----+    |
     +-------------------------------+                                             |
                                          +-----+    +----+    +----+   +----+     |
                                          |     |    |    |    |    |   |    |     |
                                          +-----+    +----+    +----+   +----+     |
                                           D18        D19       D16       D17      |
                                                                                   |
                                          +---------+    +--------+                |
                                          |         |    |        |                |
                                          +---------+    +--------+                |
                                                D10         D8                     |
-----------------------------------------------------------------------------------+