Anritsu MT9812B, Operation Manual, Page: 132 / 144

Section 7 Maintenance and Re-transportation
7-8
7.4 Troubleshooting
7.4.1 Common Items
Power is not activated.
The self check does not end even
when at least a minute has elapsed
after the power source is turned
ON.
Even when the power source is
turned ON, no indication appears
on the display or the display
remains dark.
The optical fiber cord cannot be
connected.
GPIB and RS-232C do not work.
Phenomenon Action
Press the power switch properly.
Connect the AC power source
inlet, power source cord and power
receptacle properly.
Replace the fuse.
3.9 Replacement of Fuse
First turn the power source OFF
and turn it ON again. If the unit
still switches in the same state, turn
the power source OFF promptly
and contact the service center.
First turn the power source OFF and
turn it ON again. If no indication
appears during the self check, turn
the power source OFF promptly and
contact the service center.
Use a connector of a correct shape.
3.8 Replacement of
Optical Connector
Check the position and direction of
the pawl.
Connect the GPIB and RS-232C
cables properly.
Use the cross cable as the RS-
232C cable.
Set the GPIB and RS-232C interfaces
correctly.
Set the correct GPIB address.
Set the correct RS-232C setting
conditions.
Possible cause
The power switch is not properly
pressed.
The AC power source inlet and
power source cord are not properly
connected, or the power source
cord and power receptacle are not
properly connected.
The fuse has been blown.
The display circuit is broken.
The shapes of the optical fiber cord
a connector of a correct shape.
The directions of insertion (such as
the position of the pawl) of the
optical fiber cord and connector
are different.
The GPIB and RS-232C cables are
not properly connected.
The RS-232C cable type is wrong.
The GPIB and RS-232C interface
setting (selection) is not correct.
The GPIB address setting is wrong.
The RS-232C setting conditions
are wrong.