Keysight Technologies N5221A, Service Manual, Page: 106 / 368

4-32 Keysight N5221A/22A Service Guide
Troubleshooting
Measurement System Troubleshooting
4-
— A10 frequency reference
— A4 and A13 13.5 GHz source synthesizers
— A5 and A8 sources
— A11 13.5 GHz LO synthesizer
— A21 HMA26.5
— A22 splitter
— A19 test set motherboard
— the signal separation group
— A25, A26, A27, and A28 receiver couplers
— A34, A35, A36, and A37 60-dB source step attenuators
— A38, A39, A40, and A41 60-dB bias tees
— A29, A30, A31, and A32 test port couplers
— A19 test set motherboard
— the receiver group
— A33 reference mixer switch
— A42, A43, A44, and A45 35-dB receiver step attenuators
— A23 and A24 mixer bricks
— A12 SPAM board
— A20 IF multiplexer board
— A19 test set motherboard
Use the list on the following pages to help you determine in which analyzer
functional group to begin troubleshooting.
This is by no means an exhaustive list of possible symptoms nor possible
failures. It is recommended that you view the system block diagram, at the end
of this chapter, as you review the entries in this list and perform any of the
troubleshooting procedures listed.
Good judgement and established logical troubleshooting techniques must be
used to complement the procedures contained in this section.
All Traces
— If all traces are missing in all bands , the problem is most likely in the
source group. However, a missing or disabled DSP driver may exhibit the
same or similar symptoms. To verify that this DSP driver is present and
enabled:
1. Press UTILITY , then , then . In
the Address box, click the down arrow and then click My Computer.
In an open area of the My Computer window, click the right mouse
button and then click Properties in the resulting pop-up menu.
System
Configure Control Panel...