As promised in my PRA2 post, here is comes!!
This is easy to do if you have, let's say, basic soldering skills. That means: you know how to desolder things without damaging print on PCB, how to clean up the area before and after soldering, and solder small things without schorching PCB and making shorts all over
..... if you have no idea, just ask one of your skilled friends to help.One thing that really helps is Chip Quik SMD Removal Kit, basically a kit with no-clean paste flux syringe and special lead-free alloy that stays molten for 5-6 seconds, enough to heat it up on all the little IC feet
If you don't do it on daily basis, it is cheap and handy. Check it out at http://www.emulation.com/046This procedure will help if you have 2 or 4 bad lines, or 6.... but may not help if the whole board is out of service, or just stays in service for an hour or so then crashes...
In case that You have two bad lines on a UA32 (make sure that it's not a bad phone pulling down the line, or maybe a laptop plugged directly into a outlet doing the same thing), for example lines 0 & 1, or 16 & 17, or maybe 30 & 31, looks like it's enough to replace a DATATRONIC IC for those two lines. "DATATRONIC PT73251B 9948 PRC" (manufactured in 48th week of 1999 in Peoples Republic of China, of course) - in fact, that component is galvanic insulator for two lines, like 2 peaces of a 1:1 trafo in one small package.
On another board I have different IC's, (with the same function): "Fil-Mag 23Z180SMD 9947 PHILLIPINES".
I confirm that this method works with Datatronics, but I have never tried with Fil-Mags. Should be the same thing.
I've been searching for those IC's all over internet, but couldn't find anything about it, not even a simple datasheet, so I presume that is galv insulator...
How to get an IC to repair a board? Simple: sacrifice one board with one or two or more bad Datatronics and collect all the good ones. Used board send to be repaired if you like
Layout of IC's is shown on attached picture.
image hosted on http://www.2and2.net
