Panasonic KX-FT21BX, Service Manual

Page: 132 / 206

KX-FT21LA
- 106 -
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
2. FLAT PACKAGE IC REMOVAL PROCEDURE
SOLDER Sparkle Solder 115A-1, 115B-1
OR
Almit Solder KR-19, KR-19RMA
Soldering iron Recommended power consumption is between 30 W to 40 W.
Temperature of Copper Rod 662 • } 50
ß
F (350 • }10• • )
(An expert may handle a 60~80 W iron, but a beginner might
damage the foil by overheating.)
Flux HI115 Specific gravity 0.863
(Original flux should be replaced daily.)
2) Using a cutter, cut the lead at the source.
(Cut the contents with a cutter lightly, 5 or 6 times.)
Cutter
Solder
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.
Solder
3) Remove when the solder melts.
(Remove the lead at the same time.)
Solder