Hioki MR8880-20, Instruction Manual

Page: 259 / 300

14.2 Troubleshooting
249
Chapter 14
Mainte
nance and
Service
14
If damage is suspected, check the “Troubleshooting” section before contacting your
dealer or Hioki representative.
If abnormal operation occurs, check the following items.
14.2 Troubleshooting
Before Returning for Repair
Power, operation, and display problems
Symptom Check Items Solution
The display does
not appear when
you turn the power
on. • Is the power cord disconnected?
• Are connections made correctly?
• Is the battery pack installed cor-
rectly?
Verify that the power cord is con-
nected properly (p. 37).
Verify that the batteries or battery
pack is correctly installed (p. 32).
Keys do not work. • Is any key being held down?
• Is the key-lock state active?
(A message appears when a key is
pressed while key-lock is active.)
Verify key operation.
Cancel key-lock:
(Hold the
cursor keys for
three seconds)
Power does not turn
on. • Is the AC adapter disconnected?
• A power protection component may
be damaged.
Contact your dealer or Hioki rep-
resentative for service.
Customers should not attempt to
perform parts replacement and
repair. Contact your dealer or
Hioki representative for service.
A waveform does
not appear when
you press the
START key.
• Is the "Waiting for pre-trigger" mes-
sage displayed?
• Is the "Waiting for trigger" message
displayed?
• Is the waveform display color selec-
tion box selected ( )?
When pre-triggering is enabled,
triggering is ignored until the pre-
trigger portion of the waveform
has been acquired. Recording
starts when a trigger occurs.
No changes occur
in the displayed
waveform. • Is the clamp sensor or connection
cable connected correctly?
• Is the measurement range set prop-
erly?
• Is a low-pass filter being applied?
Check that the clamp sensor and
connection cord are connected
correctly (p. 38).
Check the input channel settings
(p. 86).
The display turns
off or the display
does not appear
while the power
LED lights. • Is the backlight power saver set? Press any of the keys.
To disable the backlight power
saver, set it to Off (System
screen) (p. 199).
The data is dis-
played with a fre-
quency that is much
lower than the actu-
al frequency during
measurement. • An aliasing error (p. A20) may have
occurred.
Change the time axis range to a
fast sampling speed (p. 71).