4.1 Troubleshooting
Dealing with Unusual Circumstances
• If a message appears on the screen, see the following pages for reference.
• If servicing is necessary, or if the instrument does not operate properly even after you
have attempted to deal with the problem according to the instructions in this section,
contact your nearest YOKOGAWA dealer.
Problem
Probable Cause
Corrective Action
Reference
Section
The instrument does
not power on.
The power source is not
connected.
Check that the frame controller’s power cable is
connected. If it is loose, connect it firmly.
Section 2.8
Cannot perform
panel operations.
The instrument is in remote
control mode.
If the LOCAL soft key is showing, the instrument is
in remote control mode (through GP-IB for example).
To perform panel operations, cancel remote control
mode from the remote controller or press LOCAL to
put the instrument into local mode.
Sections 1.1, 2.1,
and 3.1 in IM
735101-17EN
The laser beam is
not generated.
(Light source module)
The optical output is locked.
If the optical output is locked, “Lock” appears in the
“Opt” box on the display. Unlock the laser output in
the system settings.
If you cannot unlock the laser output, an interlock
connector plug may not be attached to the interlock
connector on the rear of the frame controller. After
you attach the plug, unlock the laser output.
You cannot remember
the password.
(Light source module)
The default password is 1234. If you change the
password, make sure that you change it to something
that you will not easily forget.
Unable to synchronize
in PPG-ED loopback
mode.
(BERT module)
The cables are not connected.
Check that the cables are connected. If they are
loose, connect them firmly.
Section 2.5
The PPG Interface is not set to
“Electric.”
Check the PPG Interface setting. If it is set to “Optic,”
change it to “Electric.”
Section 9.2 in IM
735101-03EN
and section 7.4
and page 4-2 in
IM 735101-04EN
The input port settings are
incorrect.
Check the input port settings (DATA IN 1 and DATA
IN 2) of the ED against the actual connections. If the
settings are different from the actual connections,
change the settings to match the actual connections.
PPG output is not on.
Check the signal output. If the signal output is off,
turn it on.
The PPG and ED settings
(Pattern, PRBS length, Program
length, Logic, etc.) do not match.
Check the DAT settings of the PPG and ED. If these
settings do not match, change them so that they do.
The data amplitude is small.
Check the data amplitude value. If the amplitude is
small, increase it.
The data threshold value is set
to a value that would cause an
error.
Check the data threshold value. If the threshold value
is inappropriate, set it to an appropriate value.
The data and clock phases do
not match when DATA IN 2 is in
use.
When using DATA IN 2, you have to adjust the phase
of the input clock using an external phase shifter.
If the phase is not adjusted, use a phase shifter to
adjust it.
An error occurs in PPG-
ED loopback mode.
(BERT module)
The PPG and ED patterns do
not match.
Check the PPG and ED patterns. If these patterns do
not match, change them so that they do.
Section 9.2 in IM
735101-03EN
and section 7.4
and page 4-2 in
IM 735101-04EN
Error-add is on.
Check the Error-add setting. If it is on, turn it off.
The data amplitude is small.
Check the data amplitude value. If the amplitude is
small, increase it.
The data threshold value is
incorrect.
Check the data threshold value. If the threshold value
is inappropriate, set it to an appropriate value.
Chapter 4 Troubleshooting, Maintenance, and Inspection
4-1
IM 735101-01EN
Troubleshooting, Maintenance, and Inspection
1
2
3
4
5
Index
