Сообщение от
layder
вообщем вам немного инфы из service manual на SE k750 (c) SonyEricsson
Solder paste lead-free (SN 96% Ag 3.5% Cu 0.5%)
состав: Олово 96%, серебро 3.5%, медь (порошок) 0.5%
LFS (lead-free solder paste) characteristics:
• High melting point (typically 220°C)
• Low wettability
• High surface tension
• Difficult to spread
• Recommended tip temperature = 370°C
When servicing PBA’s that have been
manufactured with LFS (lead-free solder paste),
LFS must be used.
If not, there is a high risk for unreliable
soldering joints.
Ramp rate < 4°C/sec
Ramp rate cooling zone < 6°C/sec
Time above liquidus 60-150 sec
Minimum temperature 235°C
Maximum temperature 245°C or 260°C* for 10 sec
Bottom heat temperature 125°C-150°C
Total time Appr. 4-7 min
на миниатюре график с использованием нижнего подогрева (125-150 градусов)