Panasonic KX-VC300CX / KX-VC600CX Service Manual ▷ View online
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KX-VC300CX/KX-VC600CX
10 Miscellaneous
10.1. How to Replace the Flat Package IC
Even if you do not have the special tools (for example, a spot heater) to remove the Flat IC, with some solder (large amount), a
soldering iron and a cutter knife, you can easily remove the ICs that have more than 100 pins.
soldering iron and a cutter knife, you can easily remove the ICs that have more than 100 pins.
10.1.1. Preparation
• PbF (: Pb free) Solder
• Soldering Iron
• 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.
expert may be able to use a 60 to 80 Watt iron where
someone with less experience could overheat and damage
the PCB foil.
• Flux
Recommended Flux: Specific Gravity
→ 0.82.
Type
→ RMA (lower residue, non-cleaning type)
Note: See About Lead Free Solder (PbF: Pb free) (P.4)
10.1.2. How to Remove the IC
1. Put plenty of solder on the IC pins so that the pins can be
completely covered.
Note:
Note:
If the IC pins are not soldered enough, you may give
pressure to the P.C. board when cutting the pins with
a cutter.
pressure to the P.C. board when cutting the pins with
a cutter.
2. Make a few cuts into the joint (between the IC and its
pins) first and then cut off the pins thoroughly.
3. While the solder melts, remove it together with the IC
pins.
When you attach a new IC to the board, remove all solder left
on the board with some tools like a soldering wire. If some
solder is left at the joint on the board, the new IC will not be
attached properly.
on the board with some tools like a soldering wire. If some
solder is left at the joint on the board, the new IC will not be
attached properly.
10.1.3. How to Install the IC
1. Temporarily fix the FLAT PACKAGE IC, soldering the two
marked pins.
*Check the accuracy of the IC setting with the corresponding
soldering foil.
soldering foil.
2. Apply flux to all pins of the FLAT PACKAGE IC.
3. Solder the pins, sliding the soldering iron in the direction
of the arrow.
10.1.4. How to Remove a Solder Bridge
1. Lightly resolder the bridged portion.
2. Remove the remaining solder along the pins using a
2. Remove the remaining solder along the pins using a
soldering iron as shown in the figure below.
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KX-VC300CX/KX-VC600CX
10.2. How to Replace the LLP (Leadless Leadframe Package) IC and IC
ground plate
10.2.1. Preparation
• PbF (: Pb free) Solder
• Soldering Iron
• 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.
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)
10.2.2. 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.
• Be careful about the temperature of the hot air desoldering tool not to damage the PCB and/or IC.
10.2.3. 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:
Note:
• Be careful not to touch the peripheral parts with twee-
zers, etc. They are unstable.
3. After removing the IC, clean the P.C.Board of residual sol-
der.
10.2.4. How to Install the IC
1. Place the solder a little on the land where the radiation
GND pad on IC bottom is to be attached.
2. Place the solder a little on the land where IC pins are to
be attached, then place the IC.
Note:
Note:
• When placing the IC, the positioning should be done very
carefully.
3. Heat the IC with a hot air desoldering tool through the
P.C.Board until the solder on IC bottom is melted.
Note:
Note:
• Be sure to place it precisely, controlling the air volume of
the hot air desoldering tool.
4. After soldering, confirm there are no short and open cir-
cuits with visual inspection.
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KX-VC300CX/KX-VC600CX
10.2.5. How to Remove a Solder Bridge (Doesn't apply to IC ground plate.)
When a Solder Bridge is found after soldering the bottom of the IC, remove it with a soldering iron.
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Memo:
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