PCB layout Check items

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??1,synchronizationbetweenschematicandPCBlayout.

??opentheschematicandPCBlayout,usetoolsmenu,comparethem,

??checkresultmustbenodifferencesfound.

??ThepurposeistoinsureschematicandPCBlayoutareuniform.

??2,clearancecheck

??Minimumclearance>=0.15mm,

??ForbondingPCB,minimumclearance>=0.1mm;

??Bytheway,whenyouchecktheclearance,youshouldchecksamenet,settingup

??likethat,viatovia,>=0.15mm;SMStovia,>=0.15mm;theothersitems,0mm;

??3,connectivitycheck

??Thisiteminsureyourlayoutjobhavebeenfinished

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??4, Gerber files check

??a, silkscreen a), add silkscreen around the pads of all inserted components ,especially E-cap and transistor ; b),silkscreen diagram must be clear , one reference designator must be homologous to one component to avoid SMD assembly error. c),all silkscreen must not be on pads.

??b, route check whether exist short circuit, no flood copper area; c, solder mask check ant test point solder mask , usually there is no solder mask for vias;

??d, drill drawing check the hole dimension , insure all screw holes, socket holes dimensions are same as tooling drawing.

??5,Hi-Pot check

??a, screw hole section insure clearance of all copper , traces , pads, vias away from screw edge >=2mm; b, charger section insure clearance of charger circuit section away from others >=4mm;

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??6, P/N check

??Check PCB P/N, including P/N , REV., description , PCB material, thickness,

??panel quality.

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??7, manufacturable check

??Distance of all traces , copper , pads away from PCB edge >=0.5mm;

??Distance of all holes’ edge away from PCB edge >= thickness of the PCB;

??Via hole diameter >=0.2mm;

??Minimum trace width >=0.15mm,for bonding PCB , minimum trace width

??>=0.1mm;

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??8, others check items

??a, add copper line and solder mask at the diagonal corners of BGA component outline;

??this point is requested by SMD assembly. b, add fiducial mark points if there are SMD components on the PCB. c, check the dimension , location & function of all keypads on h/s PCB.

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