I have the 602D+... solder iron 388c to 412c temp changes and than symmetric (230V & 30mA) switch off, as on different differential brands.
With warranty, the fixed the temperature jumps....
But if I changed the EU connector in reversed manner, same differential issue. As changing temp from 380c to 410c.
We exchanged the the solder iron, no change...
So opened and studied the hole things and started to revamp:
. transformer 180° turned so input is on the back, and put on a rubber for less noisy
. removed the USB power, while never used
. added on the back a on/off switch so stuff get quiet if not used
. ALL solder points are as cement soldered
and that from a solder iron company. OK, chica do not understand with soldering to made contacts and not as fixing..
. after re soldering as it should look brilliant / shining ... after switch on temp now increases more slowly
. while phase or null of 230V will go directly to the right heater front connector dependent of the symmetric 230 EU connector
. added a filter for the transformer & connected directly to my new power switch (cable to the board off), while this may brings bursts to the power, who knows
. twisted all internal cables 230V and all of the transformer and all 230V in addition isolated
ll just as
engineering and be warned of the 230V phase to the front ... now no more 30mA symmetric power switches off... so far
Just for short & using SMD soldering good enough