Introduction
This Technical Specification applies to fitting of SMD and THD components onto the printed circuit boards in ELO+, spol. s r.o., hereinafter as the “Manufacturer”, and specifies the requirements for placing orders for production. Compliance with these rules and the below-mentioned standards is necessary to achieve the maximum quality of outputs. The complete Technical Specification can be obtained here: Technicke podminky.pdf.
Documentation
When ordering a new product, it is required to provide the complete documentation in an electronic form.
The documentation shall contain:
1. A legible version of fitting drawings with all directions identified for the directed components. Every drawing shall contain the product name including version, determination of the side it shows (TOP/BOT) and marked DPS gauge.
2. Summarized bill of material including acceptable substitutions. See Appendix 2 for an example.
3. Complete bill of material containing all components including mechanical parts and printed circuit.
4. Data plot production in gerber format RS 274 X.
5. Data for automatic fitting machines.
6. Technical drawings for mechanical assembly, if required.
7. Description of technological specialties and requirements for production.
8. If identical names (including version) are not used for all documents, it is required to attach the documentation cover sheet.
Change Control
The above-mentioned documents are transformed by the Manufacturer into production documentation. Changes in the production documentation shall be made only in form of the change control procedure. In the change control procedure, the Customer shall submit the change protocol and all new documents the change affects. There are two types of change control:
VARIATION – documentation modification applicable only to the current production order.
- CHANGE – new production documentation is generated. Unless it is stated that the change creates a new product version, the original documentation is cancelled. In case of the new product version creation, the original documentation is preserved and the Customer shall distinguish in the purchase order what product version he requests to be produced.
Data for Machine-Aided SMD Fitting
For machine-aided fitting, it is required to submit the layout of fitted components, the “fitting data”. These are text files containing the description of the components to be fitted and the position of their geometric center on the DPS, see Appendix 4.
The data is to be submitted in a separate file for every DPS side to be fitted.
The format of the submitted data shall be any text file with separators.
The file names shall correspond to the documentation including the side the data is designated for.
The maximum length of the file names (including version) is 19 digits.
The data shall contain the following:
1. coordinates of guidance points used for DPS reconciliation in fitting equipment,
2. component reference (R1,R2, C145, D56, …),
3. value of components – unless the value and material tolerance is specified (such as 10K_1%, 100nF_20%_X7R, …), the Manufacturer shall use a component at his discretion,
4. component casing (C0805, R0402, SO16, SMA, …),
5. coordinates of geometrical center in axes X and Y (not such as center of stem No. 1),
6. rotation (turning of components),
7. information about the units of the system of coordinates.
If the board contains components which are not to be fitted, it is required to replace the value in the fitting data with “not to be fitted”, or abbreviated, NA, etc.
It is also required that the values are named identically. The interchange of capital and small letters is unacceptable, and it is not acceptable to use M1, 100N, 100nF, either.
It is important to distinguish the casings of resistors, condensers and coils by marking before the size (R1206, C1206).
The conventional components shall not be included in the files for machine-aided fitting SMD!!!
The maximum length of the component value in the Value column is 19 digits.
No notes or other description than those stated can be transferred to the fitting machines.
Data for plot production.
The parameters of the plot for screen printing significantly affect the product quality. For this reason, we prefer the procedure when the Customer supplies the data and we produce the plots at our expenses. We prefer the data in format RS-274-X (Extended gerber).
- The plot shall comply with the recommendation concerning reduction and thickness of the basic material, see Attachment 1. The submitted data shall be reduced correctly (or anti-reduced) based on recommendation.
- Along with the data for the plots, it is required to submit the board contour layer and the upper and lower copper layers are recommended, as well.
- The plot needs to contain the prescribed guidance points body for reconciliation of the plot and printed circuit.
- In case of a laser-cut plot, it is required to mind the right direction (taper angle).
In case of a plot supplied by the Customer, the plot needs to be identified with the Customer name and product name including the version it is designated for. Identification shall be made in an irremovable way, such as etching or engraving.
For bigger production batches, when the use of an automatic screen printing machine is assumed, the optimum dimension of the template plate is 295 x 480 x 0.13 mm, maximum size is 434 x 567 mm. The maximum width of the printing motif is 390 mm and the maximum length of the printing motif is 352 mm.
The maximum width of the printing motif for smaller production batches is 335 mm and the maximum length of the printing motif is 350 mm. The optimum dimension of the printing motif is 220 x 250 mm.
Non-standard dimensions can be agreed to with the technologist.
It is good to consult any and all dimensions used in printed circuit board paneling and plot designing with the employees of the Technological Preparation of Production department.
Submitted material
DPS
Maximum dimensions of the workable printed circuit boards are as follows: for manual screen printing UNIPRINT 340 x 410 mm, while not exceeding the maximum dimension of the printing motif.
Maximum dimensions of the workable printed circuit boards are as follows: for in line screen printing MOTOPRINT AVL 400 x 352 mm, while not exceeding the maximum dimension of the printing motif.
Dimensions of boards workable in the automatic fitting machines range from 50 x 50 mm to 460 x 440 x 4 mm.
Maximum width of boards for the reflow operation is 460 mm.
Maximum dimensions of boards workable in the soldering wave are 400 x 480 mm, max. height of soldered component-lead is 3.5 mm.
Max. dimensions of boards workable in the automatic optical inspection system Mirtec are 450 x 400 mm.
The supplied printed circuit boards must have the parallelism of edges ensures with accuracy of 0.5 mm.
They shall not be twisted or otherwise deformed, be free of mechanical flash and loosened parts. The surface of the boards shall be flat, solderable and have surface treatment suitable for the given technology.
Minimum distance between the components from the DPS edge is 4 mm. Should this not be complied with, the technological environment shall be required.
DPS shall contain suitable guidance marks for the automatic fitting machine and screen printing even in case of a multipanel. See Appendix 3.
Components
The Customer-supplied components shall comply with the following rules:
- supplied in sufficient quantity taking into account the technological losses,
- solderable, non-oxidized, undamaged,
- identified with a value,
- identified with the information whether they meet the RoHS requirements – if not, they will be regarded as not compliant with RoHS.
Packing of Components:
- components shall be packed properly with respect to their transportation, storage and subsequent unpacking and processing,
- components shall be packed in straps, bars or pallets (mind the direction),
- components packed in straps shall have a sufficiently long leader (component carrier at least 20 mm and protective foil at least 200 mm).
Should the component packing requirements not be met, the Manufacturer reserves his right to charge the Customers with the additional work associated with processing of these components.
Along with the handed over material, it is also required to submit the delivery note containing any all information about the handed over material including the job order it is designated for.
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