Kiwi Technics Kiwi-30, Руководство пользователя

Страница: 40 / 66

40
Step 3) Desolder IC48 and C145 and fit the supplied 40 pin IC socket and wires.
It is very important that this step is done correctly.
On the top side of the voice board underneath the IC (Integrated Circuit) 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 IC and the pins free of the hole edges before the IC is
lifted out of the board.
All the ICs 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. The photo shows a Hakko
desolderer gun. 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 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 and is not recommended. 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 or chokes and can be found in most electronics parts
stores. If the solder cannot be fully removed a good idea is to resolder the joint let the hole cool and try
again. Fresh solder is easier to remove.
The following IC and parts need to be removed. IC48 (40 pin IC marked 8031 or 8051) and the capacitor right next to it marked C145. These are
marked with yellow arrows in the photo. The ROM IC46 is also not required and can be removed if it is in a socket otherwise it can be left as it is
ignored by the Kiwi30. The battery is also no longer required and can be removed to prevent any danger of leaking in the future.
www.kiwitechnics.com Kiwi-30 Upgrade User Manual v121