[ Problem Point ]
There is no good method of heat the small printed circuit board and We were in trouble.
[ ⇒Kaizen Point ]
The ring heater which can carry out uniform heating of the wide area was introduced.
The efficiency of preheating increased.
Related page:
No.29 Preheating of printed circuit board 
No.75 Aging of Printed Circuit Board 
No.16 Soldering of printed circuit board 
No.15 Printed circuit board cooling 
No.4 Reflow of printed circuit boards 
No.1 Soldering of printed circuit boards 
No.5 Dryness of the silicon wafer 
No.2 Preheat of printed circuit boards