Keysight E5071C ENA Service Manual page 70

Troubleshooting
No Display troubleshooting
Step 1. Check fan operation and DC monitor LED
If the rear panel fan (blower) doesn't run, a failure in the power supply is
assumed. Remove the E5071C outer cover and check if the following LEDs
light:
•
To check all the outputs of the power supply, measure the dc voltages at
the output lead connectors with a DMM. The dc output voltages and lead
color information is provided in the module cover label of the power
supply.
Step 2. Check system fans inside.
If the system fans on the chassis inside the E5071C don't run, problem seems
in the analog base module. In this case, remove the E5071C outer cover and
make sure whether the fans run or not.
If the power shutdown occurs without a beep, the problem seems in the
analog base module or the CPU Mother Board Assembly. Check BIOS
status of CPU Mother Board Assembly is correct as described in
configure the CPU Mother Board Assembly and BIOS" on page
Step 3. Checking with the external monitor
Connect an external XGA monitor to the VIDEO output on the E5071C rear
panel.
•
•
Check if the PCA Digital Bridge and PCA PCI DSP Board are securely
connected to the CPU Mother Board Assembly.
Step 4. Checking flat cable
Check a flat cable between the PCA Front Key and the PCA Digital Bridge.
Step 5. Check around the backlight
Check Inverter Unit Assembly and a cable between the Inverter Unit
Assembly and the PCA Front Key. Also check the cables between the
LCD-TPANEL ASSY and PCA Front Key. If the cables are normal, check the
LCD-TPANEL ASSY.
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+3.3 V and +5 V dc monitor LED on the PCA PCI DSP Card.
If something is displayed on the external monitor, the problem is present
around the LCD. Also check the PCA Front Key and PCA Digital Bridge
because the ON/OFF setting of the LCD backlight is controlled by the PCA
Front Key through the PCA Digital Bridge.
If nothing is displayed even on the external monitor, the problem seems in
the CPU Mother Board Assembly or PCA Digital Bridge.
Keysight E5071C ENA Network Analyzers
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115.