Here's how to repair the switch on the H4N the Pro can't be that different: https://www.youtube.com/watch?v=PyhAEyAzP_s
Probably this part # JSM07011SAQNL
Can usually be had here: https://www.googleadservices.com/pagead/aclk?sa=L&ai=DChcSEwjjwI36zMf6AhW8FdQBHZLAD6MYABAAGgJvYQ&ae=2&ohost=www.google.com&cid=CAESbeD20ind-vV9dME3CwwHLqqRYyQG0IbGZGDuO923HsKV3y_KnhZGlAeYq0I0Joa-d7uikumo2V1G_9LsYBlUZ0v_ovqYmxeYZvDMzCUVVIruY33SVSkq9rVvCia-EfaEpooA6G-KWBxh8jVFioI&sig=AOD64_3JLjsaevLx_JM-K-LwDFiDeR36zw&q&adurl&ved=2ahUKEwjcgf35zMf6AhXmoWoFHXyMAOEQ0Qx6BAgDEAE&dct=1
Here's how to repair the switch on the H4N the Pro can't be that different: https://www.youtube.com/watch?v=PyhAEyAzP_s
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Probably this part # JSM07011SAQNL
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Probably this part # JSM07011SAQNL
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Can usually be had here: https://www.googleadservices.com/pagead/aclk?sa=L&ai=DChcSEwjjwI36zMf6AhW8FdQBHZLAD6MYABAAGgJvYQ&ae=2&ohost=www.google.com&cid=CAESbeD20ind-vV9dME3CwwHLqqRYyQG0IbGZGDuO923HsKV3y_KnhZGlAeYq0I0Joa-d7uikumo2V1G_9LsYBlUZ0v_ovqYmxeYZvDMzCUVVIruY33SVSkq9rVvCia-EfaEpooA6G-KWBxh8jVFioI&sig=AOD64_3JLjsaevLx_JM-K-LwDFiDeR36zw&q&adurl&ved=2ahUKEwjcgf35zMf6AhXmoWoFHXyMAOEQ0Qx6BAgDEAE&dct=1