1
2
3
4
5
6
7
8
9
10
12
11
8
Disconnect the plug and measure
the resistance value between the
connecting plug pins as follows.
Checking for breakage of the heating element and cord assembly
a Between pins 4&5 (Heating Element) 2.5 - 3.5 (Normal)
b Between pins 1&2 (Sensor) 43 - 58 (Normal)
c Between pin 3&Tip Under 2
If the values of 'a' and 'b' are outside
the above value, replace the heating
element (sensor) and/or cord
assembly. Refer to Procedures
1 and 2.
If the value of 'c' is over the above
value, remove the oxidization film by
lightly rubbing with sand-paper or
steel wool the points shown below.
1.
Broken Heating Element
1. Turn the nut (1) counterclockwise and remove the tip
enclosure (2), the tip (3).
2. Turn the nipple (4) counterclockwise and remove it from the
iron.
3. Pull both the heating element (6) and the cord assembly (11)
out of the handle (12). (Toward the tip of the iron.)
4. Pull the grounding spring (5) out of the D-sleeve.
Measure when the heating element is at room temperature.
1. Resistance value of heating element (RED) 2.5 - 3.5
2. Resistance value of sensor (BLUE) 43 - 58
If the resistance value is not normal, replace the heating
element.
(Refer to the instructions included with the replacement part.)
After replacing the Heating Element,
1. Measure the resistance value between 1) pins 4 & 1 or 2
2) pins 5 & 1 or 2. If it is not , the heating element and
sensor are touching. This will damage the P.W.B.
2. Measure the resistance value 'a','b',and 'c' to confirm that
the leads are not twisted and that the grounding spring is
properly connected.
Disassembling the 907/908
Heating Element (Red)
Senser (Blue)
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