CMX  Assembly Description
              -----------------------------

                                              Rev.  1-Nov-2013

              ***  Good for Production ****


This note is a description of the assembly work that is
required on the CMX circuit board.  The CMX is a large card
400.0 mm by 366.7 mm  with about 1813 components on it.

The assembly vendor will take care of both obtaining the bare
pcb cards and then assembling the components onto these cards.

The final production version of the design data for the CMX
card  is available on the web at:

   http://www.pa.msu.edu/hep/atlas/l1calo/cmx/hardware/

                           manufacturing/for_production

Quantity and Schedule:

  We would like to build  4  prototype cards with a one
  month turn around from when the final design data, the
  Purchase Order, and the full parts kit are all in place.

  We then want to build 20 more cards starting sometime
  in early 2014.  We hope to use the exact same pcb layout
  for the production build of 20 cards as we used for the
  4 prototype cards.


CMX Bare Circuit Board:

  We are requesting that the selected assembly vendor
  procure the bare circuit boards.  We are doing this
  so that the assembly vendor can be confident of the
  quality of the bare cards and to insure that the bare
  cards have the required rails and other features to
  fit with their assembly process.

  We encourage and are willing to pay for the assembly
  vendor to obtain high quality bare cards with the
  required surface treatment to insure an optimum SMD
  solder re-flow assembly.  We assume that this will
  be a gold finish.

  A full description of the CMX pcb is given in a
  separate document in this set of design files.


Versions of the CMX Card:

  During the prototype build of 4 cards we would like 3
  versions of the card assembled.

    1 of the 4 cards will not have components U1 and U2 on it.
    1 of the 4 cards will not have component U2 on it
    2 of the 4 cards will have all components.

  During the production build of 20 cards none of them
  will have component U2 installed on them.


CMX Card Components:

  The bulk of the components used on the CMX card are surface
  mount devices.  A small number of through hole devices are
  also used - mostly connectors and power supply modules.

  All of the components that are used on the CMX circuit
  board are included in the following 2 files that are part
  of the technical data that was release for this bid:

    cmx_bill_of_materials.txt
    cmx_component_descriptions.txt


SMD Components:

  In total 1794 SMD components are used on each CMX card.
  In total there are 68 SMD component types used on CMX.

  On the top side of the card there are 994 SMD components
  of 66 different component types.

  On the bottom side of the card there are 850 SMD components
  of 14 different types.

  There are a number of files in this set of design data
  that describe the SMD components used on the CMX circuit
  board and their placement.  These files are:

     cmx_smd_placement_by_reference_number.txt

Polarized SMD Components:

  In addition to all of the ICs there are 3 other types of
  polarized components used on the CMX card:

   - 3 Transit Voltage Suppressor Diodes DZ1, DZ2, DZ3

   - 185 Tantalum Capacitors with case size B and D.

   - 9 Aluminum Electrolytic Capacitors

  The correct orientation of these components is indicated
  in the silkscreen and given in the placement data file.
  For the Tantalum Capacitors the positive end is indicated
  by both a "+" sign and by a thicker silkscreen outline.


Through Hole Components:

  In total 23 THD components are used on each CMX card.

  There are 9 different types of THD components on the
  CMX card.  Some of these THD components are solder type
  and some of them are press-fit type connectors.

  In this technical design data a full description of the
  THD components is given in the file:

     cmx_thd_components.txt

  If an assembly vendor does not have the correct press and
  tooling to install these Press-Fit components then they
  should go ahead and bid this assembly job and indicate
  that this part of the work will not be done.


Components NOT to be installed:

  There are 208 components with reference designators specified
  on the silkscreen of the CMX card that the assembly vendor will
  not install on the card.  Their reference numbers and
  coordinates are given in the file:

     cmx_components_not_to_be_installed.txt


No Solder Holes:

  There are 34 holes in the CMX card labeled in silkscreen
  WRAP-1:WRAP8,  WRAP11:WRAP36.  These holes are typically
  1 mm in diameter.  Please do not fill these holes with
  solder during the assembly process.



Technical Contacts and Shipping Information:

  Dan Edmunds                    Philippe Laurens
  Phone: (517) 884-5521          phone: (517) 884-5522
  Email: edmunds@pa.msu.edu      Email: laurens@pa.msu.edu
  FAX:   (517) 355-6661          FAX:   (517) 355-6661


  Physics Department  Rm 2150
  Bio-Medical Physical Sciences Bldg.
  567 Wilson Road
  Michigan State University
  East Lansing, MI  48824-2320