XIX. PCB Trace

1. Connection between pcb Cu grounds is too thin

Per the solder side master A/W, the connection between the two Cu grounds is very fine ( only XX mil ) (see attached file ), which is very easy opened after our etching process, to avoid the problem, we suggest

A) To strengthen shorting the connection , OR:

B) To shorten the connection

Please clarify which item (A or B) customer preferred.

2. Exposed pcb trace from solder mask opening

    Some trace was exposed from the S/M opening of fiducial mark on C/S ( S/S). We suggest you modify the S/M opening and have the traces with solder mask. Please confirm.

3. Relax pcb etching tolerance

Customer required controlling the tolerance of +/-XXX for all traces; however, our standard tolerance for line width is +/-20% or +/-1 mil Tighter tolerance can be achieved with special processing . In order to facilitate in production , we suggest you relax your minimum to be :

For trace width > 5 mil :+/-20% of master A/W , and

For trace width <= 5 mil: +/-1 mil.

Please confirm.

4. Self-spacing

On all circuitry layers , the self-spacing of some conductors was very small ( XX mil only), and on layer M , the spacing is about YY mil , and there is no enough spacing for us to move away these traces a little . So

A). We will suggest customer to re-route these traces, OR:

B). We will follow master A/W to build, and these traces will be shorten together ( see attached file ).

Please clarify which item ( A or B ) customer preferred.

5. Spacing between two traces on circuit board is too narrow

On the layer N , the spacing between two traces was only X mil, which is too narrow for our etching process with limited 20z (min) copper thickness . In order to facilitate in production , we suggest to move the trace slightly to ensure their spacing is about Y mil.

Please confirm.