
11.2 Repair and Servicing
281
11
Chapte
r 1
1
Ma
inten
ance
and Service
If abnormal operation occurs, check the following items.
If the instrument continues to operate abnormally after taking the specified corrective action, the instrument
may be malfunctioning.
Turn off the instrument's power switch immediately, then contact your dealer or Hioki representative.
If the cause of the problem is unknown, reset the system.
This restores to instrument to the default conditions set at the factory.
See
"7.3 Initializing the Instrument" (p. 121)
Troubleshooting
Symptom
Check item
Corrective action
The display
remains blank
after the power
switch is
turned on.
Is the power cord disconnected?
Check the power supply inlet indicated [AC IN]
(located on the left side when viewed from the rear of
the main instrument). Confirm that the power source
voltage of the instrument matches the power supply
voltage, then connect the power cord.
Is the LCD panel contrast adjustment
set to the lightest setting?
Adjust the contrast of the LCD panel by turning the
black dial located on the right side of the LCD panel.
Keys are
ineffective.
Is RS-232C or USB used for external
remote control?
Stop using RS-232C or USB. When the instrument is
remotely controlled, the keys are ineffective.
Is the KEYLOCK terminal of EXT I/O
set to Low level (EXT.COM level)?
Set the KEYLOCK terminal of EXT I/O to High level
(EXT.VCC level), or leave the terminal open.
The power line
for equipment
under test
does not
provide power.
Is the power cord disconnected?
Check the power supply inlet indicated [LINE IN]
(located on the right side when viewed from the rear
of the main instrument), then connect the power cord.
Is the circuit breaker located at the
upper left on the instrument's front
panel turned OFF?
Check the power consumption of equipment under
test, then turn on the circuit breaker. (20 A max.)
side : ON,
side : OFF
Leakage
current
measurement
cannot be
conducted.
Is the fuse for terminal T2 on the front
panel blown?
Replace the fuse.
(designated fuse : 250 V F50 mA L)
The clock
loses or gains
time.
The clock may lose or gain up to 4
minutes per month.
The built-in lithium battery provides backup power for
the clock. When the battery becomes depleted, the
instrument may display an incorrect date and time. If
this happens, request battery replacement (at a
charge).
The service life of the backup battery is about 10
years.
The instrument
displays
"
ERROR 1
."
Does the power supply voltage match
the specified power source voltage of
the main instrument?
Confirm that the power supply voltage matches the
specified power source voltage of the HiTESTER.
Is the power fuse blown?
Contact your dealer or Hioki representative.
The instrument
displays
"
ERROR 2
."
This error indication should not
appear in normal use.
The instrument is malfunctioning. Turn off the power
switch of the main instrument immediately, then con-
tact your dealer or Hioki representative.
Relay or fuse
check results
in NG.
• Is power supplied to LINE IN?
• Is the breaker switched on?
Confirm that the power cord is connected to the termi-
nal block for [LINE IN] on the rear panel.
Confirm that the breaker for the terminal block on the
front panel is switched on.
:ON :OFF
The DANGER
lamp stays on
continuously.
Is an incorrect supply voltage being
used?
Check the supply voltage. If this fails to resolve the
issue, the instrument may be broken. Turn it off imme-
diately and contact your dealer or Hioki representa-
tive.
Leakage
current value
is not stable.
The measured
value
fluctuates.
The instrument may be exposed to external noise. When terminal T1 and T2 are used, try
switching connections to T1 and T2, and making the measurent again. (Measuring after
switching connections to terminal T1 and T2 is safe and not a problem.)The ST5541 and
ST5541 converts the voltage used for internal sense resistance to current values.
Summary of Contents for ST5540
Page 2: ......
Page 6: ...Contents iv Index i ...
Page 29: ...23 2 Chapter 2 Instrument Labels and Screens Instrument Labels and Screens Chapter 2 ...
Page 80: ...4 8 Changing the Measurement Method Auto Manual 74 ...
Page 121: ...115 8 9 7 Chapter 7 Instrument System Settings Instrument System Settings Chapter 7 ...
Page 144: ...7 14 Setting the Backlight 138 ...
Page 284: ...10 14 Measurement Networks 278 ...
Page 290: ...11 4 Instrument Disposal 284 ...
Page 320: ...Appendix4 External Dimensions A30 ...
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