How To Replace The Flat Package Ic - Panasonic KX-FT21BX Service Manual

KX-FT21LA

HOW TO REPLACE THE FLAT PACKAGE IC

If you do not have the special tools (for example: SPOT HEATER) to remove the SPOT HEATER'S Flat IC, if you have solder
(large amount), a soldering iron, and a cutter knife, you can easily remove the ICs even if there are more than 100 pins.
1. PREPARATION
SOLDER
Soldering iron
Flux
2. FLAT PACKAGE IC REMOVAL PROCEDURE
1) When all of the IC lead cannot been seen at the
standard degree, fill with large quantities of solder.
Note:
If you do not fill with solder and directly cut the IC lead
with the cutter, stress may build up directly in the P.C.
board's pattern. If you do not fill with large quantities of
solder as in step 1, the P.C. board pattern may be
removed.
2) Using a cutter, cut the lead at the source.
(Cut the contents with a cutter lightly, 5 or 6 times.)
3) Remove when the solder melts.
(Remove the lead at the same time.)
Sparkle Solder 115A-1, 115B-1
OR
Almit Solder KR-19, KR-19RMA
Recommended power consumption is between 30 W to 40 W.
Temperature of Copper Rod 662 • } 50
(An expert may handle a 60~80 W iron, but a beginner might
damage the foil by overheating.)
HI115 Specific gravity 0.863
(Original flux should be replaced daily.)
Cutter
- 106 -
F (350 • }10• • )
ß
Solder
Solder
Solder