Roland JX-3P, Manual

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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 correctly.
All the solder must be removed from all the 40 holes and the pins free of the hole edges before the
CPU is lifted.
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 a 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.
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