Hakko Electronics FX-951 - Checking Procedure; Check for a Broken Heater or Sensor; Check the Grounding Line; Checking the Connection Cord for Breakage

First Edition: March 31, 2007
2-2 Checking the Power Supply Line (FX-951/FH-200)
NOTE Remove the case R before taking the following steps.
(5) Measure a resistance value of the power switch using a tester.
NOTE With the power switch turned on, the switch is normal if a resistance value is “1Ω or
less”.
If a resistance value is abnormal:
Replace the power switch.
(6) Check the resistance on the primary side of the transformer as follows.
Measuring points: Between the soldered parts of the power switch and the power
receptacle on the primary side of the transformer.
If a resistance value is abnormal:
Replace the transformer.
Be sure to turn the
power switch on for
measurement.
100V
5.6Ω to 6.8Ω
110V
6.0Ω to 7.4Ω
120V
6.5Ω～9.5Ω
220V
30.9Ω to 37.7Ω
230V
30.4Ω to 37.2Ω
240V
Measure the resistance between the pin
(1) on the power switch side and the
center pin on the power receptacle side
(as shown by the arrow).
Lead wires from
the primary side
of transformer