Keysight Technologies N5261A, User'S And Service Manual

Page: 69 / 99

Service Information
2-
Troubleshooting the Test Set
For assistance refer to “Keysight Support, Services, and Assistance”
on page
9 2
.
If the test set is not operating properly, use the following procedures to aid in
isolating the problem. Refer to the “Test Set Diagrams and Graphics”
starting on page
51
.
Troubleshooting, DC Level
Power Supply and Fans
1. Verify the front panel Standby switch is operational.
a. The rear panel fan and front panel DC Power LEDs should be on
when the Standby switch is in the on position.
2. AC Line voltage checks.
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 5 amp fuse, as shown in Figure 1-7 on
page 11 .
c. Remove the instrument bottom cover. Near the rear panel are two
fuse holders, remove the 8 amp fuses and verify that they are
operational. See Figure 2-11 on page 59 .
Keysight N5261/62A User’s & Service Guide
63
3. Ex ternal DC Power checks.
Verify DC voltage levels on each of the front panel DC power
connectors. Pins 1 & 3 = +12 V (± 0.8 V), Pins 4 & 6 = ground
1 3
6 4
2
5
7
Pin 1 (+12V)
Pin 6 (gnd)
Pin 3 (+12V)
Pin 4 (gnd)
a.
Figure 2-1 2 Front Panel M illimeter Module DC Power Connector