15
Disassembling the 900S
1. Slide the handle cover (2) toward the cord and
remove the screw (1) securing the heating element.
2. Turn the nut (3) counterclockwise and remove it.
3. Remove the tip (4).
4. Pull both the heating element (5) and the cord toward
the tip of the iron and out of the handle (6).
Measure the resistance values at the sensor and the
heating element of the terminal board.
The resistance value should be the same as for the 907,
908.
To replace the heating element, refer to the instructions
included with the replacement part.
1. Turn the unit ON and set the temperature to 480
°
C
(899
°
F). Then wiggle and kink the iron cord at various
locations along its length, including in the strain relief
area. If the LED heater lamp flickers, then the cord
needs to be replaced.
2. Check the resistance between the pin of the plug and
the wire on the terminal.
Pin 1: Red Pin 2: Blue Pin 3: Green Pin 4: White
Pin 5: Black
The value should be 0
Ω
. If it is greater than 0
Ω
or is
∞
, the cord should be replaced.
Refer to the drawing in the replacement parts section of
this manual. Desolder the blown fuse and remove it.
Solder on a new one.
2. Broken Soldering Iron
Cord
There are two methods of testing
the soldering iron cord.
3. Replacing the Fuse
CAUTION
The heater lamp will flicker if the iron
temperature is allowed to reach the
set temperature. Before replacing the
cord, be sure that this is not the
reason for the flickering.
14. CHECKING FOR BREAKAGE OF THE HEATING ELEMENT AND CORD ASSEMBLY
Be sure to use only genuine HAKKO
replacement Parts!
