jim - understood. thanks so much for all this valuable feedback! pete
On May 20, 2011, at 1:49 PM, Jim wrote: > > > Hi Pete, > > That stuff is likely just the remnants of the flux compound and only means > they didn't clean up very well................ > > What you're looking for is a pin that is sitting in a blob of solder, but > moves when pushed. Its a bit difficult to explain in words. Get a friend to > help you and do what I suggested before; push down from the top while you > look with very good light and perhaps magnification from below. > > OR, just suck off the old solder and re-do each joint............note, it's > almost as easy to replace the connectors while doing this. > > Regards, Jim > > > At 11:33 AM 5/20/2011, you wrote: >> ike/all - >> >> would this be an example of a "dry joint"? (see pic below - the white-ish >> coloration around some of the solder points). >> i would aim to desolder any points that look like this and redo. good idea? >> >> pete >> >> >> >> >> On May 20, 2011, at 11:01 AM, Ike wrote: >> >> > Yes, and the blast of signal is known as an "audio weld". With an old >> > console, the fault Matt describes could be anywhere, but I would start >> > with the Molex connectors. Another point, the same issue can also be in >> > soldered connections that have either cracked from stress or become cold >> > soldered (or "dry" as they say in England) over the years. This usually >> > occurs because the joint wasn't that good to begin with. Over time >> > contaminants work their way into the joint and it loses conductivity. >> > Again, the first place to look is the Molex connectors at the point where >> > they solder to the motherboard and the channel strip. Move the strips >> > around and wait a day or two. If the fault moves with the strip, it's a >> > strip issue. If it stays with the position it's the motherboard. Another >> > Molex fault is loss of spring tension in the female headers. Try checking >> > each one with either a single Molex pin, or a tool that's about the same >> > size. >> > And finally, exercise the switches on the affected modules. I don't >> > know if this is the case on the S-3, but on the Elite, the 48v switch >> > actually carries the mic signal so it can stop audio even when not engaged. >> > Best >> > Ike >> > >> > Ike Zimbel >> > Zimbel Audio Ltd >> > 416-720-0887 >> > www.zimbelaudio.com >> > Sent from my iPhone >> > >> > On 2011-05-20, at 10:28 AM, Matt Syson <[email protected]> >> > wrote: >> > >> >> Hi >> >> This fairly common 'gating' effect is usually caused by dirt on a >> >> connector, switch or pot. An oxide film is created by chemical reaction >> >> of dirt and contaminants in the air which create an insulation layer >> >> often a few atoms thick. Putting a higher signal level through 'punches' >> >> a path through this insulator (an absolutely miniscule spark) and for a >> >> while it will work 'normally' (usually with increased distortion). Then >> >> you switch off and leave it for a day or so and the contamination starts >> >> its work again. >> >> Dust, moisture in the air, smoke, all contribute to this. >> >> Matt S >> >> >> >> On 20/05/2011 14:27, pete wrote: >> >>> bros - >> >>> >> >>> continuing the surely long and possibly never ending list of questions >> >>> on my series IIIc restoration project... >> >>> >> >>> i am seeing the following behavior on the input modules (as well as the >> >>> cue modules)... >> >>> i'm feeding the line in with the multitrack output, and as i bring up >> >>> the fader (and the input gain) i get weak, fuzzy signal... until i jam >> >>> the gain way up there (very quickly) and the channel then "comes alive" >> >>> so to speak. i can then bring it back down to a sensible level and all >> >>> is OK. >> >>> >> >>> what problem is this behavior indicative of? bad connection to the >> >>> motherboard? or a component problem in the line in circuit? at the >> >>> electrical level, how is a dodgy connection "made OK" (in a sense) by >> >>> pumping a greater voltage through it? >> >>> >> >>> >> >>> thanks all - >> >>> >> >>> pete------ >> >>> >> >>> View the list online at: >> >>> http://www.mail-archive.com/[email protected] >> >>> >> >>> You can unsubscribe at anytime by sending an email to >> >>> mailto:[email protected] with "unsubscribe neotek" in the message >> >>> body. If you have any difficulties, or questions --please send an email >> >>> to mailto:[email protected]. >> >>> >> >>> The Neotek list is lovingly hosted by Catapult Web. Remember that any >> >>> message or reply sent to the list will be automatically forwarded to all >> >>> subscribers. >> >>> >> >>> Vive Le Neotek! >> >>> >> >>> Thanks. >> >>> >> >> ------ >> >> >> >> View the list online at: http://www.mail-archive.com/[email protected] >> >> >> >> You can unsubscribe at anytime by sending an email to >> >> mailto:[email protected] with "unsubscribe neotek" in the message >> >> body. If you have any difficulties, or questions --please send an email >> >> to mailto:[email protected]. >> >> >> >> The Neotek list is lovingly hosted by Catapult Web. Remember that any >> >> message or reply sent to the list will be automatically forwarded to all >> >> subscribers. >> >> >> >> Vive Le Neotek! >> >> >> >> Thanks. >> >> >> > ------ >> > >> > View the list online at: http://www.mail-archive.com/[email protected] >> > >> > You can unsubscribe at anytime by sending an email to >> > mailto:[email protected] with "unsubscribe neotek" in the message >> > body. If you have any difficulties, or questions --please send an email to >> > mailto:[email protected]. >> > >> > The Neotek list is lovingly hosted by Catapult Web. Remember that any >> > message or reply sent to the list will be automatically forwarded to all >> > subscribers. >> > >> > Vive Le Neotek! >> > >> > Thanks. >> > > > > ------ > > View the list online at: http://www.mail-archive.com/[email protected] > > You can unsubscribe at anytime by sending an email to > mailto:[email protected] with "unsubscribe neotek" in the message body. > If you have any difficulties, or questions --please send an email to > mailto:[email protected]. > > The Neotek list is lovingly hosted by Catapult Web. Remember that any message > or reply sent to the list will be automatically forwarded to all subscribers. > > Vive Le Neotek! > > Thanks. > ------ View the list online at: http://www.mail-archive.com/[email protected] You can unsubscribe at anytime by sending an email to mailto:[email protected] with "unsubscribe neotek" in the message body. If you have any difficulties, or questions --please send an email to mailto:[email protected]. The Neotek list is lovingly hosted by Catapult Web. Remember that any message or reply sent to the list will be automatically forwarded to all subscribers. Vive Le Neotek! Thanks.
