September 22, 2016

610F section  10.5 n page 10-29 states in part; "Component markings, -----
should be legible -----.  However, unless otherwise required, it is an
acceptable condition if these markings are removed or damaged during normal
cleaning or processing".

Based on the above, determining whether the parts are technically
acceptable or not depends on the following:

1. parts are known to not be suspect or confirmed counterfeit.  In some
cases, component marking issues can be an indication of suspect counterfeit.
2. the manufacturing process assures that the correct part number parts
were installed n the assembly; important since final acceptance testing may
not be capable of detecting correct parts installed.
3. assembly passed final acceptance testing.

However, if the applicable part specification mandates permanent marking,
you may need to pursue corrective action with the part manufacturer.

On Thu, Sep 22, 2016 at 2:12 PM, Stadem, Richard D. <
[log in to unmask]> wrote:

> I would disposition this as:
>  "No defect, cosmetic in nature only.  Does not affect form, fit, function
> or reliability of unit. Color bands are not needed after assembly, and test
> results prove all components are correct. Reference Designators are present
> on PWB for future component identification if needed."
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Bob Wettermann
> Sent: Thursday, September 22, 2016 11:10 AM
> To: [log in to unmask]
> Subject: [TN] Color Bands of Resistor Get Washed Off
>
> We are putting together an assembly that must meet IPC-A-610 Rev F
> inspection reqts for Clss III.
>
> After SMT THOLE resistors, where the marking could be easily seen, were
> hand soldered in to place. The entire assembly was washed and then
> inspected. At this point it was noted that the bands were pretty much no
> longer there.
>
> The boards were tested and then conformally coated and shipped. The client
> noted the defect of the missing resistor bands.
>
> What would the call be?
>
> Thanks
>
> --
> Bob Wettermann
> BEST Inc
>