Keysight Technologies InfiniVision 6000L Series, Service Manual

Page: 68 / 100

68 6000L Series Oscilloscopes Service Guide
4
Troubleshooting
To check the 6000L Series display output
1 Connect a known good external XGA display and power-up the display and the
oscilloscope.
2 If the known good display does show an output from the XGA port of the
oscilloscope, replace the system board.
To check the fan
The fan speed is controlled by a circuit on the system board.
1 If the fan is running, perform the internal self-tests. Go to “To run the internal
self-tests" on page 68.
2 If the fan is not running, it may be defective. Follow these steps:
a Disconnect the fan cable from the system board.
b Measure the fan voltage at the connector on the system board.
See the figure below for the location of the fan connector.
c If the fan voltage is approxi8.5 Vdc at room temperature, replace the
fan. If the fan voltage is not approxi8.5 Vdc, replace the system
board.
The proper voltage range depending on temperature is b6.0 Vdc to
+11.5 Vdc.
To run the internal self-tests
Self Test performs a series of internal procedures to verify that the oscilloscope is
operating properly.
It is recommended that you run the Self Test:
• after experiencing abnormal operation
• for additional information to better describe an oscilloscope failure
• to verify proper operation after the oscilloscope has been repaired
Successfully passing Self Test does not guarantee 100% of the oscilloscope’s
functionality. Self Test is designed to provide an 80% confidence level that the
oscilloscope is operating properly.
1 Press the
Utility
key, then press the
Service
softkey. Use the Remote Front Panel
feature if you are testing a 6000L Series model.