Chapter 16 Troubleshooting, Maintenance, And Inspection; Troubleshooting - YOKOGAWA DL7440 User Manual

Chapter 16 Troubleshooting, Maintenance, and Inspection

16.1 Troubleshooting

Description
The power cannot be
Using a power supply outside the ratings.
turned ON.
The backlight is turned OFF.
Nothing is displayed.
The screen colors are not appropriate.
The display is odd. The system is not operating properly.
The waveform display Waveform data was loaded from an
does not update. external storage medium.
The DL7400 is in remote mode.
Keys do not work.
Other causes.
The trigger gate is enabled.
Trigger does not activate.
The trigger settings are not appropriate.
Insufficient warm-up.
Not calibrated.
The probe's phase has not been corrected.
Measured values are
not correct.
The probe attenuation is not correct.
An offset voltage is added.
Other causes.
Cannot output to the
The printer head is damaged or worn out.
built-in printer.
The medium is not formatted.
The medium is write-protected.
Cannot save to the
specified medium.
No more free space on the medium.
The address of the DL7400 used by
the program is different from the
Cannot change settings
specified address.
or control the operation
of the DL7400 via the
The interface is not used in a way that
communication interface.
conforms to the electrical or mechanical
specifications.
IM 701450-01E
• If a message is displayed on the screen, read the following pages.
• If servicing is necessary, or if the instrument is not operating correctly after performing
the corrective actions below, contact your nearest YOKOGAWA dealer.
Probable Cause Corrective Action
Use a correct power supply.
Press any key.
Set the screen color.
Power-cycle the DL7400.
Unload the loaded waveform data.
Press SHIFT + CLEAR TRACE to
enable local mode.
Perform a key test.
If the test fails, servicing is required.
Turn OFF the trigger gate.
Set the trigger conditions correctly.
Warm up the DL7400 for 30 minutes
after turning on the power.
Execute calibration.
Perform phase correction correctly.
Set an appropriate value.
Set the offset voltage to 0 V.
Execute calibration.
If the measured value is still odd,
servicing is required.
Servicing required.
Format the medium.
Release the medium's write-protect.
Delete unneeded files or use another
storage medium.
Match the address used in the program
to the address of the DL7400.
Use it in a way that conforms to the
specifications.
Reference
Section
3.3
15.5
15.4
3.3
12.8
–
16.3
6.17
Chapter 6
–
4.6
3.5
5.5
5.6
4.6
–
12.6
–
12.6, 12.14
16
Communication
Interface
User's Manual
(IM 701450-17E,
CD-ROM)
16-1