Panasonic KX-FT21BX Service Manual page 133

After removing the Flat IC and when attaching a new IC, remove any of the excess solder on the land using the soldering
wire, etc. If the excess solder is not removed from the land, the IC will slip and not be attached properly.
3. FLAT PACKAGE IC INSTALLATION PROCEDURE
1) Temporarily fix the FLAT PACKAGE IC by soldering on the two marked pins.
*Check the accuracy of the IC setting with the corresponding soldering foil.
2) Apply flux to all pins of the FLAT PACKAGE IC.
3) Solder using the specified solder, in the direction of the arrow, by sliding the soldering iron.
4. BRIDGE MODIFICATION PROCEDURE
1) Lightly re-solder the bridged portion.
2) Remove the remaining solder along the pins using a soldering iron as shown in the figure below.
Temporary soldering point.
Soldering iron
Specified solder
bridge
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KX-FT21LA
Flux