Haier 21F3A-T Service Manual page 12

copper as absolutely necessary).
2. Carefully scratch away the solder resist and acrylic coating (if used) from the end of the
remaining copper pattern.
3. Bend a small "U" in one end of a small gauge jumper wire and carefully crimp it around the
IC pin. Solder the IC connection.
4. Route the jumper wire along the path of the out-away copper pattern and let it overlap the
previously scraped end of the good copper pattern. Solder the overlapped area and clip off
any excess jumper wire.
At other connections
Use the following technique to repair the defective copper pattern at connections other than IC
Pins. This technique involves the installation of a jumper wire on the component side of the
circuit board.
1. Remove the defective copper pattern with a sharp knife.
Remove at least 1/4 inch of copper, to insure that a hazardous condition will not exist if the
jumper wire opens.
2. Trace along the copper pattern from both sides of the pattern break and locate the nearest
component that is directly connected to the affected copper pattern.
3. Connect insulated 20-gauge jumper wire from the lead of the nearest component on one
side of the pattern break to the lead of the nearest component on the other side.
Carefully crimp and solder the connections.
CAUTION: Be sure the insulated jumper wire is dressed so that it does not touch components
or sharp edges.
11
Warning and Cautions