CRAMPS 1.0

Release status: Working

Description	Cape-RAMPS for BeagleBone
License	GPL
Author	User:Cdsteinkuehler
Contributors
Based-on	RAMPS-FD
Categories	RAMPS, electronics, surface-mount electronics
CAD Models	KiCAD
External Link

Summary

The CRAMPS board is a mixed surface-mount and through-hole design. There are a small number of fine-pitch components (the resistor networks and FET bus level translator). These parts are challenging but possible to solder by hand. All other parts are large pitch or through-hole, and are relatively easy to hand solder.

Safety

The CRAMPS board is designed to handle power levels capable of causing a fire. Be very careful with the initial board checkout, ideally using a power supply protected from short circuit and overload. Never operate your board unattended, and make sure all connected parts subject to heating (including the wires and connectors!) are far away from any potentially combustible material. Always use the proper fuses, and insure your smoke detector is working properly.

Assembly

Required Tools

You must have: Solder iron, solder wire, good tweezers
You really need: Solder wick, solder sucker, flux pen
Optional methods use: Solder paste, hot plate or oven

Cape Assembly

Soldering the CRAMPS board includes both surface mount and through hole soldering.

The surface mount can be done a few ways. To hand solder, start by putting a small amount of solder on one pad. If you have flux, coat the soldered pad. Use the tweezers to hold the component down in position and heat the solder to tack the component into place (make sure the entire solder blob flows so you don't get a cold solder joint). Then solder the other pads. Also popular is using solder paste for pad by pad soldering, Oven Reflow (need link), and HotplateReflowTechnique

Solder the SMT components first, starting with the fine pitch parts then working through the parts from shortest to tallest. Then solder the through-hole parts on top of the board. Finally solder the pin headers on the bottom of the board.

Do Not Populate : Remove

Initial testing showed that the thermistor protection diodes were not needed and caused issues with performance. These parts should not be populated, and should be removed (or have one terminal lifted) if present on the board. I recommend drawing across the pads with a Sharpie or similar permanent marker so you know these parts should not be present.

1N4148 : D1001 D1002 D1003 D1004 D1005 D1006 D1007 D1008

Do Not Populate : Optional

These parts are not required, but do not need to be removed if you have already soldered them to the board. I recommend drawing across the pads with a Sharpie or similar permanent marker so you know these parts should not be present.

D102 : SS10P4-M3/86A
U1001 : TLV431CDBZR
R1002 : 1k 1% 0805 Resistor
R1003 : 2150R 1% 0805 Resistor
R1004 : 12k4 1% 0805 Resistor