Keysight Technologies X-Series User manual

N9042B
Cooling Fan Upgrade
Option HW2
X-Series Signal Analyzer
INSTALLATION NOTE

Notices
© Copyright 2023 Keysight Technologies, Inc.
The information contained in this document is subject to change without notice.
Keysight Technologies makes no warranty of any kind with regard to this material, including but
not limited to, the implied warranties of merchantability and fitness for a particular purpose.
Keysight Technologies shall not be liable for errors contained herein or for incidental or
consequential damages in connection with the furnishing, performance, or use of this material.
Manual Part Number
N9042-90013
Edition
Edition 1, January 2023
Supersedes: none
Printed in USA/Malaysia
Published by:
Keysight Technologies, Inc.
1400 Fountaingrove Parkway
Santa Rosa, CA 95403

Installation Note N9042-90013 3
Option HW2 – Cooling Fan Upgrade
Option HW2 – Cooling Fan Upgrade
This document provides detailed instructions for the installation of the Cooling Fan upgrade for the
N9042B UXA Signal Analyzer.
Please be sure to read this entire document before attempting to perform this upgrade. Then, be
sure to perform the steps in this procedure in the order that they are listed so that the installation
will complete properly, and the instrument will function as desired when completed.
Compatibility
This instrument option requires no specific instrument firmware version and is compatible with all
N9042B instruments. However, all instruments with option G2H do not require this upgrade, they
include it from the factory.
Instrument Calibration
The validity of any existing calibration that the instrument being upgraded may have will not be
affected by the installation of this upgrade.
Products Affected: UXA N9042B
To Be Performed By: (X) Keysight Service Center
(X) Advanced User
()User
Estimated Installation Time:
Estimated Adjustment Time:
Estimated Verification Time:
1.5 Hours
0.0 Hours
1.0 Hours

4Installation Note N9042-90013
What You Will Find in this Document
What You Will Find in this Document
ESD Information............................................................................................................ page 5
Upgrade Contents ........................................................................................................ page 7
Tools Required .............................................................................................................. page 7
Initial Instrument Functionality Check ........................................................................ page 7
Option G2H Check........................................................................................................ page 7
Upgrade Instructions.................................................................................................... page 8
Hardware Removal ................................................................................................... page 8
Hardware Installation ............................................................................................ page 13
Verify Operation ..................................................................................................... page 16
Instrument Button Up............................................................................................ page 17
Adjustments and Performance Verification ............................................................. page 18
Manual Procedures Required................................................................................ page 18
Automated Utilities Required................................................................................ page 18
Automated Adjustments Required ....................................................................... page 18
Automated Performance Verification Testing Required ...................................... page 18

Installation Note N9042-90013 5
ESD Information
ESD Information
Protection from Electrostatic Discharge
Electrostatic discharge (ESD) can damage or destroy electronic components. All work on electronic
assemblies should be performed at a static-safe workstation. Figure 1 shows an example of a
static-safe workstation using two types of ESD protection:
— Conductive table-mat and wrist-strap combination.
— Conductive floor-mat and heel-strap combination.
Both types, when used together, provide a significant level of ESD protection. Of the two, only the
table-mat and wrist-strap combination provides adequate ESD protection when used alone. To
ensure user safety, the static-safe accessories must provide at least 1 megohm of isolation from
ground.
Figure 1 Example of a Static-Safe Workstation
These techniques for a static-safe workstation should not be used when working on circuitry
with a voltage potential greater than 500 volts.

6Installation Note N9042-90013
ESD Information
Handling of Electronic Components and ESD
The possibility of unseen damage caused by ESD is present whenever components are transported,
stored, or used. The risk of ESD damage can be greatly reduced by paying close attention to how all
components are handled.
— Perform work on all components at a static-safe workstation.
— Keep static-generating materials at least one meter away from all components.
— Store or transport components in static-shielding containers.
Test Equipment Usage and ESD
— Before connecting any coaxial cable to an analyzer connector, momentarily short the center and
outer conductors of the cable together.
— Personnel should be grounded with a 1 megohm resistor-isolated wrist-strap before touching
the center pin of any connector and before removing any assembly from the analyzer.
— Be sure that all analyzers are properly earth-grounded to prevent build-up of static charge.
For Additional Information about ESD
For more information about preventing ESD damage, contact the Electrical Over
Stress/Electrostatic Discharge (EOS/ESD) Association, Inc. The ESD standards developed by this
agency are sanctioned by the American National Standards Institute (ANSI).
Always handle printed circuit board assemblies by the edges. This will reduce the possibility of
ESD damage to components and prevent contamination of exposed plating.

Installation Note N9042-90013 7
Upgrade Contents
Upgrade Contents
This upgrade kits includes a new preassembled fan assembly to replace the existing one, along with
a new instrument dress cover to match the new location of the cooling fans. This kit is intended to
be used when either an older version of the assembly needs replacing, or when the owner of the
instrument has requested to have this newly designed assembly installed to reduce the acoustic
noise level of the instrument.
Tools Required
— TORX Driver, T-10
— TORX Driver, T-20
—Multi-BitTorqueDriver
Initial Instrument Functionality Check
Power on the instrument and allow it to complete its boot up process. Verify that there are no
instrument messages that would indicate that there is an issue with either the instrument hardware
or software. If there are any issues, investigate and fix the problem before continuing with this
upgrade.
Option G2H Check
While the instrument is still powered on check to see if the instrument has option G2H installed. To
do so press System, Show System and look on the System Information screen for option G2H.
If the instrument has option G2H installed it does not need this upgrade, as it should already have
this hardware installed.
Table 1-1 Upgrade Contents
Part Number Description Quantity
n/a Fan Assembly 1
N9041-60070 Dress Cover Assembly 1

8Installation Note N9042-90013
Upgrade Instructions
Upgrade Instructions
Hardware Removal
Dress Cover Removal
1. Turn the instrument off and disconnect the power cord.
2. Referring to Figure 2, remove the two screws (1) that attach the strap handles (2) from both
sides of the instrument and remove the strap handles.
Figure 2 Dress Cover Removal
3. Remove the four rear feet (4) by removing the four screws (3) and washers that attach them.
4. Remove the four bottom feet (6) by first removing the locking keys and then lifting the tabs
and sliding the foot toward the tabs.
5. Carefully slide the dress cover (5) off the instrument. This dress cover will not be reused.

Installation Note N9042-90013 9
Upgrade Instructions
Front Panel Removal
6. Referring to Figure 3, remove W1 (1) from the A7 Midplane board (2).
Figure 3 Disconnect W1 From A7 Midplane
7. Referring to Figure 4, remove the seven flathead screws (1) from each side of the A1 Front
Panel assembly and two flathead screws (2) from the bottom that attach it to the instrument.
Figure 4 Front Panel Screws

10 Installation Note N9042-90013
Upgrade Instructions
8. Referring to Figure 5, slide the A1 Front Panel assembly aware from the instrument enough to
access and remove W2 (1) from the A1A3 Front Panel Daughter board.
Figure 5 W2 Access and Removal
9. Set the A1 Front Panel assembly aside.

Installation Note N9042-90013 11
Upgrade Instructions
Old Fan Assembly Removal
10.Referring to Figure 6, remove the two flathead screws (1) and the two panhead screws (2)
attaching the rear panel to the fan assembly.
Figure 6 Fan Assembly Removal
11.Remove the four flathead screws (3)(4) attaching the top brace and the card cage side brace
to the fan assembly.
12.Remove the four panhead screws (5) attaching the fan assembly to the chassis front brace
and the left front end brace stiffener.
13.Remove the four screws (6) attaching the fan assembly to the chassis base.
14.Carefully tilt the fan assembly out at the top, moving the coax cables going to the rear of the
instrument out of the way if necessary.
15.Referring to Figure 7, unplug the wire harnesses for the two large fans (1) and the wire
harness from the two small fans (2) from the side of the A7 Midplane board.

12 Installation Note N9042-90013
Upgrade Instructions
Figure 7 A7 Midplane Board Fan Connections
16.The old fan assembly can now be removed and discarded.

Installation Note N9042-90013 13
Upgrade Instructions
Hardware Installation
Fan Assembly Installation
1. Set the bottom edge of the new fan assembly into place in the instrument with the top tilting
outward
2. Referring to Figure 7, connect the two fan power supply connectors to the two lower
connectors (1) on the side of the A7 Midplane board
3. Tilt the new fan assembly into place, arranging the coax cables along to top of the assembly as
needed
4. Referring to Figure 8, use the two flathead screws (1) to attach the fan assembly to the top
brace and the two flathead screws (2) to attach it to the card cage side brace. Do not tighten
the screws at this point.
Figure 8 Fan Assembly Installation
5. Use the two flathead screws (3) and the two panhead screws (4) to attach the rear panel to
the fan assembly. Do not tighten the screws at the point.
6. Use the four panhead screws (5) to attach the fan assembly to the chassis base. Do not
tighten the screws at this point.
7. Use the four panhead screws (6) to attach the fan assembly to the chassis front brace and the
left front end brace stiffener. Do not tighten the screws at this point.
Since the fan assembly is attached to so many other parts, it is best to loosely
install all the screws before tightening any of them to the specified torque level.

14 Installation Note N9042-90013
Upgrade Instructions
8. Torque all sixteen screws that were installed in steps 4 through 7 to 9 in-lbs.
Front Panel Installation
9. Referring to Figure 9, position the A1 Front Panel assembly near the front of the instrument
and attach W2 (1) to the A1A3 Front Panel Daughter board.
Figure 9 W2 Connection
10.Referring to Figure 10, attach the A1 Front Panel assembly to the instrument and secure it with
the seven flathead screws (1) on each side and the two flathead screws (2) on the bottom of
the instrument. Torque all sixteen screws to 21 in-lbs.

Installation Note N9042-90013 15
Upgrade Instructions
Figure 10 A1 Front Panel Installation
11.Referring to Figure 11, plug W1 (1) back into the A7 Midplane board.
Figure 11 W1 Connection to A7 Midplane Board

16 Installation Note N9042-90013
Upgrade Instructions
Verify Operation
The operation of the new fans should be verified before installing the instrument dress cover.
1. Connect the AC mains to the instrument and turn it on.
2. Verify that both fans are spinning and sucking air into the instrument.
3. Turn the instrument off and remove the AC mains.

Installation Note N9042-90013 17
Upgrade Instructions
Instrument Button Up
Dress Cover Installation
1. Referring to Figure 12, carefully slide the outer cover (5) onto the instrument.
Figure 12 Dress Cover Installation
2. Attach the four rear feet (4) using the four panhead screws and washers (3). Torque the
screws to 21 in-lbs.
3. Install the four bottom feet (6) along with the locking keys.
4. Install the strap handles (2) to both sides of the instrument using the two screws (1) at either
end of the handles. Torque the screws to 21 in-lbs.

18 Installation Note N9042-90013
Adjustments and Performance Verification
Adjustments and Performance Verification
Manual Procedures Required
Front Panel Key Test1
Front Panel Display Test1
Front Panel Touch Test1
Automated Utilities Required
None
Automated Adjustments Required
None
Automated Performance Verification Testing Required
Residual Response
Displayed Average Noise Level
Phase Noise
1. See Chapter 18, “Service Menus” of the N9042B Service Guide for direction on performing this manual pro-
cedure.

This information is subject to change
without notice.
© Keysight Technologies 2023
Edition 1, January 2023
N9042-90013
www.keysight.com