Date: Sun, 05 May 2002 15:42:19 +0000 From: "neil barnes" <[EMAIL PROTECTED]> Subject: Re: [LIB] Soldering temperatures
>Date: Sun, 05 May 2002 18:14:57 +0800 >From: Raymond <[EMAIL PROTECTED]> >Subject: Soldering temperatures > >What sort of temperature would be suitable for soldering to the delicate >SMD circuits on the Libretto motherboard? Would it be dangerous using >lead-free electronics solder for this (lead-free solder requires a higher >temperature to melt)? Use the solder that's already on the board - leaded in this case I think. Mixing solders isn't usually a good idea. I don't recall the temperature in degrees - it's hot enough when a piece of solder wire melts *instantly* it comes into contact with the tip and flows onto the tip nicely. You'll need a hotter temperature with a finer tip as it will cool along the length more quickly. On our irons at work, it's usually around (er) number 4 - which isn't that helpful. 250-260 degrees C for lead/tin solder rings a bell. Note that you're better off with a hotter than a cooler iron - think what temperature the component is if you've been sat there ten minutes with the iron just below the melting point of the solder... > >Secondly, when the motherboard is unpowered, how safe is it using your >average digital multimeter to do continuity tests? I've heard that its not >wise to use some multimeters to continuity test certain circuits due to the >currents involved ... No worries - 'olde worlde' continuity testers can throw sizeable fractions of an amp across the tested part, but DVMs use a micro-amp sized current. I'd recommend, if you're worried, to use the resistance range, rather than the diode test, which usually doubles as a continuity tester. Neil _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp. ************************************************************** http://libretto.basiclink.com - Libretto mailing list http://www.silverace.com/libretto/ - Archives -------TO UNSUBSCRIBE------- Reply to any of the list messages. The reply mail should be addressed to: [EMAIL PROTECTED] - Then replace any text on the message's subject line: cmd:unsubscribe --------TO UNSUBSCRIBE DIGEST------ Do above but with this on subject line: cmd:unsubscribe digest **************************************************************
