On Wed, 26 Nov 2008 02:37:48 -0500, "Tom Del Rosso"
wrote:


"Archimedes' Lever" wrote in message

On Tue, 25 Nov 2008 10:38:45 +0000, f825_677
wrote:

its a £1050 exchange PCB from Sony, but to buy new is £11,600, the
whole mixer at purchase was just over £300,000 its not a cheap piece
of equipment,

Yeah, and you are not very brainy to think that someone would tell
you to reflow the entire board. Learn to read. Then learn how to
properly comprehend what you read.

You refer to "the entire board". He refers to a PCB, but not the one you
think. The part in question is a PCB in itself. It's a hybrid module with
its own SMT parts, so you can't heat the whole part.

YES, you can, damnit! The key is to PRE-heat the entire part so that
the transition of temperature from that temp to the temp needed to remove
the part is lower, and less likely to reflow only a portion of the pins.
It insures that ALL the pins on the chip reflow, and the chip can be
removed without damaging the PCB.

I never said anything about reflowing the entire PCB. HE DID!

I mentioned PRE-heating the PCB, and then HEATING only the part to be
removed to the reflow temperature.

Google the part number and see what it looks like.