To Check The Fan; Figure 14 Location Of The Fan Connector - Agilent Technologies InfiniiVision 7000 Series Service Manual

4 Troubleshooting

To check the fan

80
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"
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.
Fan
Connector
J3400
Location of the Fan Connector
Figure 14
on page 81.
7000 Series Oscilloscopes Service Guide