Roland KIWI-3P Manual page 32

32
Step 4) Desolder the CPU (IC44) and fit the supplied 40 pin IC Socket.
It is very important that this step is done correctly.
On the top side of the board underneath the IC44 CPU are some fine tracks that will be damaged and difficult to repair if all the solder is not removed
All the solder must be removed from all the 40 holes and the pins free of the hole edges before the CPU is lifted.
correctly.
The CPU pins should be able to move freely in the hole which shows that they are not still soldered to the hole sides. The best way to achieve this is with a
good vacuum desoldering tool. The photo shows an older Hakko being used. A hand vacuum can be used but these can cause damage to the board as
they can jump and damage tracks as they are triggered. Quality Solder wick is a better approach than a hand desolderer.
HINT
The trick with soldering and desoldering on these old resin boards is to not let things get too hot. The board and the copper both get soft at 300 °+ and are
easily damaged. Do not keep retrying a pin that will not work the first time. Work on other pins, let that one cool and try again when it has cooled. If it will not
desolder try resoldering it with fresh solder, let it cool and try again. As a last resort cut the cpu pin as close to the cpu as you can with fine cutters, remove
the pin from the hole by hooking it out with a soldering iron using the cut bent top, let it cool and then desolder the hole.
www.kiwitechnics.com 3P Matrix Upgrade User Manual v1.2