First Edition: March 31, 2007
2-2 Checking the Power Supply Line (FX-951/FH-200)
I: Measure across the ground line.
II, III: Touch the plug with the tester probe as shown in
the photo and measure at two positions on the station
side indicated by arrows.
2-2
Checking the Power Supply Line
Check the power supply line for the following points.
(1) Has the sheath on the power cord been dropped or damaged?
If the sheath on the power cord has been dropped or damaged:
Replace the power cord, as it may break eventually.
(2) Measure the resistance values of the power cord
at three points using a tester.
(Photo on the right)
NOTE
The cord is normal if resistance values are “1
Ω
or less”.
If a resistance value is abnormal:
Replace the power cord.
(3) During measurement in step (2) above, twist and bend the power cord at various angles
(including the plug and the station connecting part).
If abnormal resistance values are detected:
The line is broken. Replace the power cord.
(4) Turn on the power switch and measure the resistance value between power receptacle
pins.
NOTE
Under normal conditions, the resistance values are as listed in the following table.
(resistance values of the primary side of the transformer)
If the resistance value is different from the value in the table above:
The power switch or the transformer is faulty. Proceed to steps (5) and (6).
If the resistance value is within the above range:
Proceed to section 2-3.
100V
5.6
Ω
to 6.8
Ω
110V
6.0
Ω
to 7.4
Ω
120V
6.5
Ω
～
9.5
Ω
220V
30.9
Ω
to 37.7
Ω
230V
30.4
Ω
to 37.2
Ω
240V
Measure the value
between these
power receptacle
pins.
