User's Manual
Table Of Contents
- Title page
- Contents
- 1 General Information
- 2 Preparing the Oscilloscope for Use
- 3 Testing Performance
- List of Test Equipment
- To construct the test connector
- To test the 54621D/22D Oscilloscope digital channels
- To verify digital channel threshold accuracy
- To verify voltage measurement accuracy
- To verify bandwidth
- To verify horizontal Dt and 1/Dt accuracy
- To verify trigger sensitivity
- Agilent 54622A/22D/24A Performance Test Record
- Agilent 54621A/21D Performance Test Record
- 4 Calibrating and Adjusting
- 5 Troubleshooting
- 6 Replacing Assemblies
- 7 Replaceable Parts
- Declaration of Conformity
- Notices
5-10
Troubleshooting
To check out the oscilloscope
8
Is the fan running?
The low voltage power supply has a thermal cut-out circuit. If the fan is
defective, the low voltage power supply will shut down when it gets too hot for
safe operation.
If the fan is running, perform the internal self-tests. Go to “To run the internal
self-tests” on page 5-13.
If the fan is not running, it may be defective. Follow these steps:
a Disconnect the fan cable from the power supply.
b Measure the fan voltage at the connector on the power supply.
See Figure 5-2 for the location of the fan connector.
c If the fan voltage is approximately +8 Vdc, replace the fan. If the fan voltage
is not approximately +8 Vdc, replace the power supply.
Figure 5-2
Location of the Fan Connector
+5.1 / -5.2 V
Balance Adjustment
Fan Connector Printer Power
+3.3V Adjustment
service.book Page 10 Wednesday, December 18, 2002 8:35 AM