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Question 2 - How to find the pin number on SMD packages?The following images illustrate how to identify the first pin or the pin polarity for some SMD components, which were used in CB0703. U1 U1 is PIC18F2550, there is a "dot" mark on the chip and pin 1 is on the left side of the mark.
U3, U4 U3 and U4 are 24LC512 EEPROM, identify the "dot" mark on the chip, and pin 1 is located on the left side of the mark.
U5 U6 U5 is LM317L, U6 is FDC6420C, both chip has a "dot" mark next to the pin 1.
C15 C15 is an aluminum electrolytic capacitor, there is a black mark on the top of the capacitor which represents the "negative side" of the capacitor.
C5, C12,C14 (Black band denotes cathode) C5, C12 and C14 are tantalum capacitors, the black mark on the top of the capacitor package represents the anode (positive termination) of the capacitor.
SMD LEDs The SMD LEDs have a color make on the cathode (Negative termination).
LED (Through Hole) The through hole type LED has a shorter pin which represents cathode (negative termination).
D100 D100 is 1N4148, which has a mark on the cathode (Negative termination).
D5 D5 is diode S1G, which has a mark on the cathode (Negative termination).
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