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8.5. CSP ASSEMBLY PROCEDURE
Step 1.
Cleaning of the PCB (at CSP installation area)
Remove the PCB from BOARD WARMER
NOTE: Caution of hot wind from the reflow hole.
Removal of the solder of CSP installation area
Flat the solder on the electrode land using the solder of CSP
installation area on C.B.A. by the soldering iron.
--- (the tip temperature is 380 )
Slide soldering iron on the surface of the remaining solder with
gentle stroke.
installation area on C.B.A. by the soldering iron.
--- (the tip temperature is 380 )
Slide soldering iron on the surface of the remaining solder with
gentle stroke.
Perform soldering without making a string and uneven solder.
(Visually check for remaining solder using a magnifire)
(Visually check for remaining solder using a magnifire)
Rainforced
land
land
Be careful not to produce soldering defects
such as whisker or soldering inconsistency
on the electrode lands.
such as whisker or soldering inconsistency
on the electrode lands.
PCB
NOTE: Do not use the desolder braid.
It causes to remove the electrode land
copper foil.
copper foil.
< Installation area figure. A >
Electrode
land
land
Rainforced land
Alignment mark
(on the PCB)
(on the PCB)
Reference: Some types of CSPs have reinforced
lands and others not.
Clean the CSP installation area
Wipe out the flux from the board surface using alcohol or others.
(*1: HOZAN Z-293, Code No. 92923 Flux remover)
Apply the flux at the CSP installation area ----- Using flux with brush
Apply the flux lightly with a brush.
Place a new CSP on the PCB and align it
It is recommended to use a magnifier. (HOZAN L-55 + L-65 etc.)
Align the CSP with the alignment marks on the board. (Refer to "Installation area figure. A")
POINT: When viewed from above, the alignment marks should be visible along the CSP on the PCB.
POINT: When viewed from above, the alignment marks should be visible along the CSP on the PCB.
After the CSP has been aligned, move the PCB to the SPOT HEATER / BOARD WARMER.
Be careful not to vibrate the PCB while moving it.
After moving the PCB, check if the CSP does not deviate from the installation position using a magnifier
or something.
Be careful not to vibrate the PCB while moving it.
After moving the PCB, check if the CSP does not deviate from the installation position using a magnifier
or something.
Apply the flux lightly.
15
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