Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

----- Original Message -----
From: "timbomcnuckle" <jaydag71@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Wednesday, August 15, 2007 6:07 PM
Subject: [Homebrew_PCBs] Re: UV developer re-do's....how to??


>
>
>> How will you tell if the resist needs touching up?
>>
> hhhmmmm,, I dunno if I understand-- you mean how do I know if a
> mistake has been made after the developer? it would be obvious I
> assume once compared to the artwork. Things like creep, poorly filled
> areas, etc.(in most cases could be manually cirrected with additional
> re-touch work, but if not then...) A hypothetical problem that I
> assume would render the pcb unusable for developing thereafter,,
> correct? I mean to suggest that there are no re-dos for a
> presensitized PCB unless you have some UV sensitive material to
> spread back over the cleaned board? (I personally don't yet).

If your exposure and transparency are OK, and the transparency is in contact
with the board, there shouldn't be any problems. If you do have problems
with your process, they will rather extensive, and you won't be able to do
much about them.


>
> What else can I use to get the resist off the PCB after development?
> I'm on a harsh budget so cannot go out and buy more chems than what I
> curentluy have on hand.

NaOh is cheap.

Leon
--
Leon Heller
Amateur radio call-sign G1HSM
Yaesu FT-817ND transceiver
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leon355@...
http://www.geocities.com/leon_heller