To: Dean Lehocky ADCO Circuits 1900 Northfield Drive Rochester Hills, MI 48309-3870 Phone: 810-853-6620 FAX: 810-853-6698 FROM: Dan Edmunds and Steve Gross Physics Department Michigan State University East Lansing, MI 48824-1116 Phone: (517) 355-8525 email: Edmunds@pa.msu.edu FAX: (517) 355-6661 Subj: Instructions for the assembly of the Timing Origination Module Revision A Circuit Board Date: 16-OCT-1996 ------------------------------- --- Good for Production --- ------------------------------- Assembly of Timing Origination Module PCB Rev A (TOM Rev A) ----------------------------------------------------------------- These instructions are for the assembly of the quantity of 20 of a printed circuit board referred to as the Timing Origination Module (TOM) printed circuit board. The TOM printed circuit board has both single sided surface mount components and pin through hole components. The size of this circuit board is 15.748" x 14.437". It is rectangular in shape with a large area (about 9" x 10") cut out from one corner. We will supply all of the components and the raw printed circuit boards to the assembly vendor in a kit along with the required drawings and CAD data. The bill of materials that accompanies this document contains a table which shows for each part number used on this card: the number used, the reference designators, and whether the part is surface mount or through hole. We will supply the assembly vendor with the Gerber data from our Mentor Graphics CAD system from which the vendor can make the required solder paste stencil. The vendor is also responsible for supplying any jigs or special tooling that they use during the assembly of these cards. We will also supply CAD data about the placement location of all of the SMD components. All of the small SMD components will be supplied on tape and reel. The only components supplied loose will be some of the through hole components. The raw circuit boards that we will supply for this build are currently being manufactured by Sovereign Circuits in North Jackson, Ohio. We should be able to ship the raw boards and the kit of parts to you by the first week of November. We request that the assembly of these 20 circuit boards be done in two steps. We would like 2 of the cards assembled within 4 weeks after we deliver the kit of parts to you. We would like 1 or 2 days to test this card and verify that all parts are being assembled in the proper way. After approving this "first article" we would give you the OK to assembly the remaining 18 cards. You would have up to 4 weeks to assemble these 18 cards. The assembly vendor is not responsible for any electrical testing of these circuit boards. The assembly vendor is responsible for guaranteeing that all of the components have been properly assembled onto the circuit boards. All soldering, assembly techniques, and the finished circuit boards are to meet the IPC standards for workmanship for electronic assemblies. The three drawings that are included with this documentation which show: a general view of the component side of the Timing Origination Module card at approximately 1/2 scale, and full scale views of the component side traces and pads and the component side silk screen. Included on the floppy disk that came with this documentation is: this document, the bill of materials for the Timing Origination Module, Gerber data for the solder stencil, Gerber data for the component side silk screen, Gerber data for the component side solder mask, Gerber data for the component side traces and pads, and aperture tables to go with these Gerber files. The files on this disk are: TOM_ASM.txt This document TOM_BOM.txt The Bill of Materials Art_16.Grb Gerber data for the component side Silk Screen Art_14.Grb Gerber data for the component side Solder Mask Art_02.Grb Gerber data for the component side Traces and Pads Art_17.Grb Gerber data for the Solder Stencil Aperture.txt The Gerber Aperture Table In general, we expect you to perform this build to standard industry best practices and ANSI/IPC-A-610B standards. We have a few specific points to address regarding component usage: 1. Components R160, R161, R180, R181, R200, R201, R250 and R251 through-hole components specified in the BOM as Company Part Number pn-106A560 ( 6 pin SIP resistor networks), should be replaced on the board with Company Part Number pn-sip_6_socket (socket strip). Note that we have provided "socket strip" from which appropriate length segments can be cut, but have not provided the resistors, networks which we will install in-house. 2. Component U370, a through-hole component specified in the BOM as Company Part Number pn-xtal_osc (a 50 MHz Crystal Oscillator) should be replaced on the board with Company Part Number pn-dip_14c_socket (a 14-pin DIP socket with corner pins only). Note that we have provided these sockets, but have not provided the Crystal Oscillator, which we will install in-house. 3. Connectors J1-J6 should be attached to the board using the supplied 12mm x 2.5mm hardware. Please feel free to contact us regarding any assembly issues that arise from these instructions.