Hakko Electronics FX-952, Руководство пользователя

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Case3 Only the soldering iron number
appears on the display.
Check the display after switching to the soldering iron number for the
soldering iron that does not get hot. Only the soldering iron number
appears as shown in the pictures above.
Causes
： ： ： ：
The operation button of the soldering iron number may be pressed
for more than one second. Pressing the operation button of the soldering
iron number for more than one second switches off the electric power to the
soldering iron.
This function is available in order to protect an unused
soldering iron from oxidation when only one of the two
soldering irons is used. Press the operation button of the
soldering iron number for more than one second again to cancel
this function.