(1) All components , mounting holes , positioning hole has a corresponding label printing plate made in order to facilitate the installation of all components , mounting holes , positioning hole has a corresponding label printing , silk screen mounting holes on the PCB with H1, H2 ...... Hn be identified .
2 screen character follows from left to right , from the bottom of the screen characters try to follow the principles from left to right , from the bottom up principle, for electrolytic capacitors, diodes and other devices try to keep the polarity within each functional unit in the same direction .
3 The device pads , lining of tin tin trail requires no screen , the device bit number should be installed after the device is obscured . ( Higher density on the PCB except the screen need not be )
Guarantee the reliability of the welding device , the device requires no screen on the pad ; in order to ensure the continuity of the lining of tin tin Road , requests are lining of tin tin trail no silk ; order to facilitate the insertion and maintenance of the device , the device digit number should not be after installing the cover device ; not pressed against the screen vias , pads , to avoid loss of part of the screen , do not affect the training window when the solder resist opening . Screen spacing greater than 5mil.
4 polar components of its polar diagram shows clearly on screen , it is easy to identify the polarity mark .
5 has a direction and the direction of the connector on the screen clearly expressed .
6 identifies the position of the PCB in the bar code should PCB board space permitting, should barcode printing frame 42 * 6 of the PCB, the bar code scanning position should be easy .
7 made board PCB board name, date , version number, and other information screen position should be clear . Board should be made on the PCB board file name, date , version number, and other information screen , the position clear, eye-catching .
8 on the PCB should have complete information about the manufacturers and anti-static logo.
9 correct number of sheets PCB Gerber files , each should have the correct output , and a complete output layers .
10.PCB on the device identifier must BOM list and consistent identification symbol .
Design Considerations printout
1 layer needs to output are:
(1 ) the wiring layer including the top / bottom / intermediate wiring layer / supply layer comprises a layer of VCC and GND layer ;
( 2 ) . Silkscreen printing , including the top / bottom screen /
( 3 ) . Solder layer comprises top and bottom solder solder
( 4 ) . While also generating drill files NCDrill
2 If the power level is set to Split / Mixed, then the Document entry window and select Routing AddDocument Gerber file output before each PCB plans to be on the Plane Connect using PourManager be clad ; If set to select Plane in CAMPlane I want to set the layer item Layer25 plus choose Pads and Vias in Layer25 layer.
3 In the Device Settings window by Device Setup changed the value of Aperture 199
4 In the Layer when setting up each election the Board Outline
5 Do not choose when setting screen layer Layer Part Type Select the top and bottom silkscreen layer Outline Text Line
6 Set Layer selection solder layer vias expressed without solder on the hole , do not choose the family said solder vias depending on the specific circumstances identified
7 When using PowerPCB generate drill files do not make any changes to the default settings
8 All Gerber file output with CAM350 open later and printed by the designers and reviewers based on "PCB Checklist " Check
Safety labeling requirements
1 Safety identifies whether the fuse is equipped with complete logo near the fuse 6 , including the fuse number, fusing characteristics , rated current value, explosion-proof characteristics , rated voltage, the English warning label . If F101 F3.15AH, 250Vac, "CAUTION: For Continued Protection Against Risk of Fire, Replace Only With Same Type and Rating of Fuse". If there is no spatial arrangement in English warning label on the PCB, will explain workers, put the product in English warning label instructions for use .
2 hazardous voltages on the PCB area marked high voltage warning symbol PCB dangerous voltage part of the application 40mil wide area dotted with safe voltage isolation region , and printed on high risk identification and "DANGER! HIGH VOTAGE". High-pressure warning symbol shown in Figure : DANGER HI!!
3 primary , secondary side isolation zone clearly marked original PCB , pay with a clear edge isolation , the middle dashed logo.
4. PCB board should clearly identify the complete safety .
