Hioki ST5540, Instruction Manual, Page: 288 / 326

11.3 Replacing Fuses
282
Stop using the instrument in the cases described below.
Disconnect the power cord and test leads, then contact your dealer or Hioki representative.
• When instrument damage can be confirmed.
• When the instrument cannot be operated for measurement.
• When the instrument has been stored under high temperature and humidity for an extended time.
• When the instrument has been subjected to rough handling under adverse transport conditions.
11.3 Replacing Fuses
• Replace the fuse for measurement operation only with one of the spec-
ified characteristics and voltage and current ratings. Using a non-speci-
fied fuse or shorting the fuse holder may cause a life-threatening
hazard.
Fuse for measurement operation 250V F50mAL
• To avoid electric shock, turn off the power switch and disconnect the
power code and test leads before replacing the fuse.
• Since a blown fuse in the power supply cannot be repaired or replaced
by the customer, contact your dealer or Hioki representative.
Use the VA check function to check for blown fuses in the power supply
and the fuse check function to check for blown fuses in the measure-
ment circuit.
Replacing the fuse for measurement operation (front panel)
1.
Turn the power switch OFF( ) then dis-
connect the power cord and test leads.
2.
Turn off the circuit breaker.
3.
Gently press the red holder at terminal T2,
turn it 90 degrees, then remove the fuse
holder.
4.
Replace the fuse for measurement opera-
tion with one of the specified rating. Verify
that the fuse has been inserted into the red
holder.
5.
With the indented section on the fuse
holder facing up, insert the fuse holder into
the socket on the main instrument, then
turn it 90 degrees.
4
Spare fuse
for main instrument
•
When removing the fuse holder, the fuse may remain in the instrument in rare
instances. Tilt the instrument on its side and remove the fuse. Next, install a
new fuse in the fuse holder and insert the holder, connecting it to terminal T2.
•
Inserting the fuse holder and connecting it to terminal T2 while a fuse still
remains in the instrument will cause the fuse to fall into the instrument.