Troubleshooting (MSO/DPO5000 Series)
Isolating to a B
oard if Power Will Not Come Up. If the instrument is in standby
mode (plugged in, but not turned on), a green light is visible through the right side
of the instrument, and the front-panel Power button is amber.
When you press the power switch, the s witch turns green and the instrument
should boot. If this does not happen, isolate the problem to a module as follows:
Remove boards one at a time to locate a fault (the COM-E Interface board
with module, Main board, Analog board, and Front-panel board).
If the previous s tep did not identify the problem, check the IEC power cable.
If the prev
ious step did not correct the problem, replace the power supply.
If the Instrument Will Not Boot. If nothing is displayed, check that the d isplay
is turned on. At boot time, and while using an external monitor connected to
the external video port, press the Del key on a connected keyboard to enter the
BIOS setup.
If the instrument will not start, press the Del keyontheconnectedkeyboard. Go
into CMOS setup and select “Load optimized defaults.”.
If the Instrument Application Does Not Work. If the instrument starts Windows, but
the instrument application does not work (the DPO Main graphic is displayed),
check the following:
1. The diagnostic LEDs. (See the following section). Check to see if the PCIe
locked LED is lit.
2. The application software.
3. The Analog board.
4. Th
e COM-E Interface board.
5. Did someone exit the application using Task Manager and then try to reenter
t
he application without rebooting?
6. If the relays click, the acquisition is running.
Checking the Backlight. If the instrument display is not working, shine a flashlight
directly at the display while the instrument is on and the fans are running. Move
the flashlight around and look at the screen from different angles to determine
whether you can see any activity on the LCD. If you see the expected display but
it is not visible without the flashlight, check for a problem with the backlight or
associated circuitry or cables.
If there is a display on the external video port, but not on the LCD, check the
power supply voltages. If the voltages are okay but there is still no display on the
LCD, replace the display assembly (LC D, la mps, and ca ble ). (See Figure 4-9
on page 4-47.)
4–48 MSO70000/C, DSA70000B/C, DPO70000B/C, DPO7000, MSO5000, DPO5000 Series
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