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Chapter 5: Troubleshooting
No Display Trouble Isolation
5–11
4 HDD clicking* PC Power-On Self Test
(POST) memory test message
on external monitor.
The HDD begins clicking* as it is
accessed by the system. The
external SVGA monitor shows the
POST messages. These messages
show the memory test.
If there is no display on the
external monitor, either the
motherboard A4 (including CPU
or RAM), the SVGA display
board, cabling, or external VGA
monitor are suspect. Check the
cabling and VGA monitor first.
Next, use a POST (Power-On Self
Test) card to help isolate the no-
display problem. Install the POST
card in an ISA slot and apply
power to the instrument. The
POST card displays the
respective codes as the power-
on self tests are completed. See
the “POST Code Listing” in this
chapter for codes and
descriptions. Replace the
motherboard, CPU, or RAM as
indicated from the POST code
listing.
5 HDD clicking* System board configuration
appears on external monitor
and internal display.
The HDD continues clicking* as the
instrument loads the oscilloscope
application. The flat panel LCD
backlight comes on and the display
shows the system board
configuration. This is an indication
that the motherboard and SVGA
display board are functioning
correctly.
6 HDD clicking* The Infiniium display appears
on the internal and external
displays.
The HDD continues clicking.*
7 Attenuators click as
solenoids are preset
to known states
Front panel LEDs change to a
normal operating pattern.
Both screens go blank
momentarily.
The attenuators click. This is louder
than the HDD clicking and comes
from the front of the instrument. The
front panel LEDs change to a normal
operating pattern. For example, the
Trigger LEDs show only one trigger
mode, such as Edge, and one trigger
coupling, such as dc.
8 Attenuators click to
their operating states
(second interval,
indicates scope
running)
Oscilloscope display comes
up on both the external
monitor and the scope's front
panel display.
The attenuators click a second time.
The oscilloscope display backlight
comes on, and the display appears
on both the external monitor and the
scope's front panel display. The
oscilloscope is running.
If the attenuators click a second
time but the display does not
come up, try the front panel keys
to see whether they respond. If
so, there is a display problem. If
the external monitor shows the
screen but the oscilloscope does
not, the problem may be with
cabling, the backlight inverter
board A3 not supplying +900 V
and +12 V, the flat-panel display
A2, or the SVGA display board
A5. See the sections “To check
the backlight inverter voltages”
and ”To check the SVGA display
board video signals.”
* Later model hard disk drives are much quieter than earlier models.
The clicking can only be heard with the instrument sleeve removed and in close proximity to the hard disk drive.
Time Audible Indicators Visible Indicators Description Troubleshooting