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9. CHECKING PROCEDURE (Soldering iron)
Heating element
resistance (red)
Sensor resistance
(blue)
After replacement
1. Measure the resistance between pins 4 and 1, 4 and 2, 5 and 1, and 5 and 2. If it is not
∞
, the heating
element and sensor are touching. This will damage the circuit board.
2. Measure the resitance “a,” “b,” and “c” to confirm that the leads are not twisted and that the grounding
spring is properly connected.
a. Between pins 4 & 5
(Heating Element)
b. Between pins 1 & 2 (sensor)
c. Between pin 3 & Tip
2.5 – 3.5 Ω
(at time of room temperature)
43 – 58 Ω
2 Ω or less
Buff lightly.
Disconnect the plug of the cord assembly and
measure the resistance value between the ping
of the connecting plug as follows.
If the values of “a” and “b” are outside the value
in the table, replace the heating element
(sensor) and/or cord assembly.
If the value of “c” is over the value in the table,
remove the oxidization film by lightly rubbing with
sand-paper or steel wool the points shown in the
drawing on the right.
A. Broken Heating Element/Sensor
●
Disassembling
1. Turn the nut
①
counterclockwise and remove the
tip enclosure
②
and the tip
③
.
2. Turn the nipple
④
counterclockwise and remove it
from the iron.
3. Pull both the heaing element
⑥
and the cord
assembly
⑦
out of the handle
⑧
. (Toward the tip of
the iron).
4. Pull the grounding spring
⑤
out of the sleeve of the
terminal
⑨
.
* Measure when the heating element is at room
temperature.
1. Heating element resistance (red) 2.5 – 3.5 Ω
2. Sensor resistance (blue) 43 – 58 Ω
If the resistance value is not normal, replace the
heating element. (Refer to the instructions included
with the replacement part.)
