RAMPS 1.4 Assembly - Part 1 PDF Print Email
Written by Steve Hildinger   
Tuesday, 24 April 2012 02:38

Preparation

To begin with, go through all your components and parts to make sure you have everything that you need in the BOM.  Of course, you will also need a soldering iron and solder to do this.  I suggest using 0.20" solder (thin), especially for the surface mount items.  Ideally, you would also have a wet spong or something to clean any excess solder of the tip of your soldering iron.  Once the soldering iron is heated up we get our PCB out and lay it in front of us.  It should look like this:

002---Empty-PCB

Now go through and put a very small amount of solder on one of the surface mount pads for each of the surface mount devices.  I have left-handed and hold the iron in my left hand, so I put solder on the left pads to put the surface mount items on later.  We will be reheating these and putting the components on them.  Below is an example of what your board may look like after doing this:

003---One-Pad-Per-SMD

After that is completed we will start putting on all the surface mount components.  To do this, we touch the pads we just added solder to with our iron, set the component into the melted solder, remove the iron from the solder, wait a few seconds, then check to make sure it's in position.  You may need to put it into nearly the right place, let it cool, then reposition the tweezers to push it down into place.  We aren't going to solder them yet, but make sure that you'll be able to solder the other side of the component to the other pad.

 

 Surface Mount 100nF Capacitor and LEDs

We will now start with the 0.1uF (or 100nF) surface mount capacitor.  It is labeled as C2 on the PCB.  This one looks a lot like a surface mount resistor, but it is tan in the middle and has no numbers on it.  You can put this capacitor in without worrying about putting it in the wrong direction, either direction will work out fine (not that you can see a direction on it anyways).  Below is a picture showing the location and what it should look like when you get it on:

004---0.1uF-Cap

Next up, we will put on the green LED.  There is only one of these and it is located at the position marked LED1.  The position matters on the LEDs.  You will see one of the sides marked with a green line.  This end goes towards the 3 dots on the board.  This is also the direction opposite of where the + sign is on the board.  If you put it in the wrong direction, everything will still work, but your LED won't light up.  These can be hard to try and remove, so make sure you put it on in the right direction.  The picture below shows it put onto the board in it's position:

005---Green-LED

We now have 3 red LEDs to put on.  They go into the positions marked LED2, LED3, and LED4.  You will need to orient them into the proper direction like you did with the green LED, i.e. green line towards the dots and away from the + sign.  Below are is a picture of their locations and a close-up of our work so far:

006---Red-LEDs 007---Red-LEDs-Close-Up

Surface Mount Resistors

This next section will cover the surface mount resistors.  The orientation doesn't matter on any of these.  The first ones we will put into place are the 10 Ohm resistors.  There are 3 of them and on the board the go into the positions marked R13, R14, and R15.  Here is a picture that shows where you can find them:

008---10-Ohm-Resistors

Next, we'll put in the 1k Ohm resistor, there is only one of them.  This resistor goes into the position marked R12.  Here is where you can find it:

009---1k-Ohm-Resistor

We now have the 1.8k Ohm resistors.  There are three of these.  They are located at positions R23, R24, and R25.  Here are the locations:

010---1.78k-Ohm-Resistor

For the next step we have 5 resistors to place.  This time we will be placing 4.7k Ogm resistors.  They all go near each other towards the right side of the board.  They go onto positions R1, R7, R11, R21, and R22.  Below you will find a couple pictures showing the positions:

011---4.7k-Ohm-Resistor 012---4.7k-Ohm-Resistor-Close-Up

We're getting near the end of the surface mount resistors now.  We will now put on the 10k Ohm resistors.  There are 5 of these ones as well and they go onto the positions R16, R17, R18, R19, and R20.  Here are a couple more pictures showing the location of them:

013---10k-Resistors 014---10k-Resistors-Close-Up

Now we will put on the last of the resistors, the 100k Ohm resistors.  There are 8 of these and they go into the positions marked R2, R3, R4, R5, R6, R8, R9, and R10.  Here's where you'll find them:

015---100k-Ohm-Resistors 016---100k-Ohm-Resistors-Close-Up

Once you've finished putting all these small surface mount components on, take a good look over everything.  The biggest thing is to double-check that your LEDs are in the right direction, with the side that has the green line on the opposite side of the + sign.  Make sure everything looks like you can solder the other end on.  It's much easier to reposition something right now with only one pad soldered than after you solder both ends.  Once you are satisfied, go through and solder the other end of all these surface mount items to the other pad.

 

Continue on to Part 2 - Surface Mount Capacitors

Last Updated on Wednesday, 25 April 2012 03:57