Apple's 1st generation stylus for the iPad Pro, announced September 9 and launched mid November 2015. Model A1603. Apple Pencil troubleshooting, repair, and service manuals.
Apple Pencil Teardown Reveals Antenna, Battery and Tiny Folded Logic Board - MacRumors
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Apple Pencil Gen 1 vs. Gen 2 vs. USB-C: What's the Difference?
Pair Apple Pencil with your iPad - Apple Support
Apple Pencil Teardown - iFixit
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How to Connect My Apple Pencil to My iPad: A Step-by-Step Guide - GadgetMates
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Pencil - Accessories - Apple - Computers & Tablets
Apple Pencil (1st Generation) Tip Replacement - iFixit Repair Guide