YOKOGAWA AQ7260 OTDR, User Manual, Page: 432 / 442

Chapter 10 APPENDIX
10-5
10.2 Troubleshooting
When the Instrument Appears Faulty
When you think that the instrument is faulty, check the following items.
Symptoms Check Items
Is the power switch on the instrument turned ON?
Check whether the POWER LED is lit.
Is the AC power cord or battery pack connected properly?
Check the connections.
Not possible to turn ON the
power.
The battery has probably run out.
Check whether the POWER LED is lit in green.
Nothing is displayed on the
screen.
Is the instrument operated within the specified operating temperature range?
The LCD becomes dark at high temperatures, and its display speed slows down
at low temperatures.
Check the specified operating temperature range.
The battery has probably run out.
The instrument will be turned OFF when the battery has run out.
The screen becomes blank
after a certain time.
The power save function is probably enabled.
Press any key.
LCD brightness is probably set to “DARK”.
Switch to the SETTING mode, and check the preset LCD brightness.
The life of the LCD has probably expired.
The life of the LCD is approximately three years.
The screen is dark.
Temperature of the Instrument or the battery pack is probably high.
The instrument may change the LCD brightness to “DARK” automatically for
protected instrument against damage.
Not possible to change
measurement conditions.
The lockout function is probably enabled.
Enter the lockout code to disable the lockout function.
Power has been turned OFF.
The power was probably turned OFF automatically since an alarm was output
from the instrument. *1
Push the power switch to turn ON the power.
Not possible to charge the
battery pack. The battery pack is probably extremely hot or cold. Remove the battery pack
from the instrument, and let it stand to cool down to room temperature.
Power has been turned off
while start-up. Is the power switch turned on twice when starts this instrument?
(*1) To prevent possible breakdowns, the instrument displays a warning message and turns
OFF the power automatically when it is in a critical condition. The next page shows the
symptoms that cause a message to appear.