__ Locate the spot for the CAT24C512 EEPROM, it’s a SOIC-8 package (8 pins with “J”
leads) and is just to the left of the capacitor you just mounted. Note that there is a dot on the
lower-left corner pin; that is Pin 1, and should match the dot on the part.
Slightly tin the bottom right pad. Remove the CAT24C512 EEPROM from its package, and
hold it in place with tweezers. With the soldering iron in your other hand, heat up the lead over
the tinned pad until the solder melts. Hold the iron on the pad for another 5 seconds to allow
the solder to flow, then remove the heat. Hold the part in place for at least 10 seconds to allow
the solder to cool.
With a 10x jeweler’s loupe, inspect the solder joint to make sure that it’s good. Inspect the
other pads to make sure that the leads are centered over the pads. If not, reheat the solder joint
and move the part as necessary.
When you are satisfied that all of the leads are centered on the pads, solder the remaining leads,
alternating sides and skipping leads to help prevent solder bridges and overheating the part.
Wait at least 10 seconds between each solder joint.
__ Locate the .1 uF capacitor just to the left of the EEPROM, it will be marked .1 uF.
Remove ONE .1 uF capacitor from the tape (it will be brown), and solder it in place. Inspect
the solder joints with a 10x jeweler’s loupe to make sure you don’t have any solder bridges.
__ Cover the pressure sensor, memory, and the two capacitors with a small piece of paper
masking tape, but leaving the two sets of pads marked “472” uncovered. This is to protect
them against any stray solder splatter.
__ Locate the 4.7K resistor just above the pressure sensor (it will be marked “472”).
Remove ONE 4.7K resistor (marked “472”) from the tape and solder it in place. Inspect the
solder joints with a 10x jeweler’s loupe to make sure you don’t have any solder briges.
__ Locate the 4.7K resistor just above the EEPROM (it will be marked “472”). Remove
ONE 4.7K resistor (marked “472”) from the tape and solder it in place. Inspect the solder
joints with a 10x jeweler’s loupe to make sure you don’t have any solder briges. Remover the
masking tape over the pressure sensor et al afterwards.
Section 5 – Mounting the Through-Hole Parts
Next, you will be mounting most of the through-hole parts. In general, you will want to use a
small piece of paper making tape to hold them in place so they don’t fall out as you turn the
board over to solder them. Also, you will want to double-check the polarity on the parts…
they don’t work very well backwards!
(54 strony)
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