Roland Kiwi-8P User Manual page 46

46
Step 3) Desolder the listed ICs, resistors and transistor and fit the supplied 40 pin IC sockets, resistors and links.
It is very important that this step is done correctly.
On the top side of the voice board underneath the ICs (Integrated Circuits) that need to be removed 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 in the three large ICs and the
16 holes in the small IC and the pins free of the hole edges before the ICs are lifted
out of the board.
All the CPU pins should be able to move freely in the holes 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. A combination of a
quality Solderwick and a hand vacuum can be used but you will need to take care as these can cause
damage to the board. The copper used in these older resin based circuit boards is very soft at 300+
degrees and is very easily lifted from the surface. A hand vacuum tool will jump and can damage tracks as
it is triggered. If tracks are damaged they will need to be repaired before proceeding to the next step. The
best way to do this is with a fine enameled copper wire which is the same as is used to wind transformers
and can be found in most electronics parts stores.
The following ICs and parts need to be removed. IC8 (40 pin IC marked HD63B03), IC20 (16 pin IC marked
uPD7001), IC30 (40 pin IC marked 8051), IC34 (40 pin IC marked 8155). Also remove the following resistors
R35, R52, R53, the transistor Q10, and the Resistor Net RA6. Also remove the ROM chips IC6 & IC22
marked JX8P A & JX8P B from their sockets as these are not required for the upgrade.
www.kiwitechnics.com JX-8P Upgrade User Manual v130