Miscellaneous; How To Replace The Llp (Leadless Leadframe Package) Ic; Preparation; Caution - Panasonic KX-TG7841S Service Manual

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13 Miscellaneous

13.1. How to Replace the LLP (Leadless Leadframe Package) IC

Note:
This description only applies to the model with Shield case.

13.1.1. Preparation

• PbF (: Pb free) Solder
• Soldering Iron
Tip Temperature of 700 °F ± 20 °F (370 °C ± 10 °C)
Note:
We recommend a 30 to 40 Watt soldering iron. An expert may be able to use a 60 to 80 Watt iron where someone with less
experience could overheat and damage the PCB foil.
• Hot Air Desoldering Tool
Temperature: 608 °F ± 68 °F (320 °C ± 20 °C)

13.1.2. Caution

• To replace the IC efficiently, choose the right sized nozzle of the hot air desoldering tool that matches the IC package.
• Be careful about the temperature of the hot air desoldering tool not to damage the PCB and/or IC.

13.1.3. How to Remove the IC

1. Heat the IC with a hot air desoldering tool through the P.C.Board.
2. Pick up the IC with tweezers, etc. when the solder is melted completely.
Note:
• Be careful not to touch the peripheral parts with tweezers, etc. They are unstable.
When it is hard to melt the solder completely, heat it with a hot air desoldering tool through the IC besides through the
P.C.Board.
3. After removing the IC, clean the P.C.Board of residual solder.
P.C.Board
IC
P.C.Board
IC
Hot Air Desoldering Tool
Tweezers, etc.
P.C.Board
Hot Air Desoldering Tools
68