Technical data

98 6000 Series Oscilloscopes Service Guide
4 Troubleshooting
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 99.
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 approximately +8.5 Vdc at room
temperature, replace the fan. If the fan voltage is not
approximately +8.5 Vdc, replace the system board.
The proper voltage range depending on temperature is
between +6.0 Vdc to +11.5 Vdc.
Figure 15 Location of the Fan Connector (shown on 6000A model)
Fan
Connector
J3400
6000_series_service_guide.book Page 98 Friday, March 23, 2007 2:43 PM