13
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
enclosure pipe
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.)
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10. ERROR MESSAGE (Soldering iron)
B. Broken Cord Assembly
There are two methods of testing the cord
assembly.
1. Turn the unit ON and set the temperature control
knob to 480℃ (880°F). Then bend the iron cord at
various locations along its length, including in the
strain relief area. The cord assembly needs to be
replaced if S-E is displayed or although the LED
heater lamp flashes, the tip temperature doesn’t
rise.
2. Check the resistance between the plug pin and the
terminal lead.
Pin 1: Red Pin 2: Blue Pin 3: Green Pin 4: White
Pin 5: Black
Resistance: 0 Ω.
If it is higher than 0 Ω or is ∞, the cord should be
replaced.
CAUTION
The power lamp starts to flash when the
temperature reaches 480°C (880°F) regardless
of the condition of the cord.
●
Sensor Error
●
Low-temperature alarm
tolerance error
350°C (400°C – 50°C)
Set temperature
Set temperature Low-temperature
alarm tolerance
Low-temperature
alarm tolerance
OR
650°F (750°F – 100°F)
EXAMPLE:
When there is the possibility that a failure has occurred in the sensor or
heater (including the sensor circuit), is displayed and the power is
shut down.
CAUTION
The sensor error also occurs if the tip is not inserted properly.
is displayed when the sensor detection temperature is lower than
the low-limit temperature you set. When the tip temperature rises over the
low-limit temperature you set, the normal display is restored.
* The low temperature error will be displayed once the set temperature
has been reached.
EXAMPLE:
Assume that the temperature setting is 400°C/750°F and the tolerance
50°C/100°F. If the temperature continues to decrease and finally falls
below the value indicated left while the heating element is on,
starts blinking to indicate that the tip temperature has dropped.
