U3022AH10
Troubleshooting the Test Set
The opening of covers or removal of parts is likely to expose the user to
dangerous voltages. Disconnect the instrument from all voltage sources
before opening.
1.
Verify the front panel power switch is operational.
a.
The rear panel FAN and front panel Active LED should operate when the Standby Switch is
in the ON position.
2.
AC Line voltage checks (remove AC power from the instrument).
a.
Ensure the proper AC line voltage is present at the instrument line cord.
b.
Remove the AC power cord from the instrument. Check the instrument AC line module
fuse; refer to
c.
Check the internal AC lines fuses. Remove the instrument bottom cover. Near the rear
panel are two fuse holders. Remove the the fuses and verify that they are operational. See
3.
Internal DC Power Checks. During this check you will reapply AC power to the instrument with
the top cover removed. Connect the AC power cord to the Test Set.
a.
Set the front panel switch to the Standby position. No fans or indicator lights should be
operational.
b.
Set the front panel switch to the ON position. The rear panel and internal power supply fan
should be operational. The front panel Active LED should be ON if the Test Set is
connected to an active PNA-X.
c.
Verify that the DC power indicator LEDs are ON. Refer to
Note: The LED indicators only indicate the presence of a DC voltage, not the DC voltage
level. Use the indicated wire locations for voltage measurements. TP1 is your common.
Non-RF Malfunctions
If the Test Set is not operating properly, use the following checklist to aid in isolating the
source of the non-RF malfunction. Typical malfunctions may be the loss of the rear panel fan,
control lines, or front panel indicator lights.
U3022AH10 User's and Service Guide
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