Hakko Electronics FR-702 - CHECKING PROCEDURE (Desoldering Tool); Check for a broken heater or sensor; Replacing the fuse

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16. CHECKING PROCEDURE (Desoldering Tool)
WARNING
Unless otherwise directed, carry out these procedures with the power switch OFF and
the power UNPLUGGED.
■ Check for a broken heater
or sensor
■ Replacingthefuse
1. Check for a broken heater or sensor
Verify the electrical integrity of the heater and
sensor.
Measure the resistance of the heater and sensor
while at room temperature（15〜25℃；59〜77℉）.
It should be 3.9 Ω ±10%. If the resistance exceeds
these limits, replace the tip.
1. Unplug the power cord from the power receptacle.
2. Remove the fuse holder.
3. Replace the fuse.
4. Put the fuse holder back in place.
Measure the resistance across this position.