Agilent Technologies ESA-L1500A Installation and operation manual

Part Number E4411–90047 Supersedes E4411–90042
Printed in USA June 2000
Installation Note
Agilent Technologies ESA-L1500A Spectrum Analyzer
Power Supply Upgrade Kit Number E4411-60021

Notice.
The information contained in this document is subject to change without notice.
Agilent 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. Agilent Technologies
shallnotbeliableforerrorscontainedhereinorforincidentalorconsequentialdamagesinconnectionwith
the furnishing, performance, or use of this material.
© Copyright 1998-2000 Agilent Technologies, Inc.

Installation Note E4411–90047 3
E4411-60021 Power Supply Upgrade
Introduction
This kit has been provided to reduce excess noise in the power supply of the ESA-L1500A spectrum
analyzer.
Installation Kit Parts List
Table 1 Parts Kit E4411-60021 Contents
Product Affected: . . . . . . . . . . . . . . . . . . . . . . .. ESA-L1500A Spectrum Analyzer
Serial Numbers: . . . . . . . . . . . . . . . . . . . . . . . US37451286 and Below Require This Upgrade
The Following Exceptions Do Not Require
This Upgrade:
US37451120, US37451121, US37451122,
US37451123, US37451124, US37451143,
US37451203, US37451212, US37451223,
US37451229, US37451230, US37451238,
US37451243, US37451253, US37451256,
US37451261, US37451263, US37451264,
US37451266, US37451268, US37451270,
US37451272, US37451277, US37451279,
US37451281, US37451284
To Be Performed By: . . . . . . . . . . . . . . . . . . . . (X) Agilent Technologies Service Center
(X) Personnel Qualified by Agilent
Estimated Installation Time: . . . . . . . . . . . . . 1.25 Hours
Estimated Verification Time: . . . . . . . . . . . . . 0.5 Hour
Item Quantity Description Part Number
1 1 Daughter Board E4401-60090
2 1 Capacitor, 4700 pF, 100V (small bubble cap. labeled 472K) 0160-4831
3 1 Capacitor, 4700 pF, 250V (rectangular cap. labeled 4n7 Y2) 0160-4439
4 1 Capacitor, 1000 pF, 100V (small bubble cap. labeled 102K) 0160-4574
5 2 Resistor, 10 ohm 0757-0346
6 1 Resistor, 1 ohm 0698-8812
7 1 Insulation Sleeve 0890-0099
8 1 Label, Power Supply Assembly (E4401-60111) 7121-7526
9 1 Label, Power Supply Main Power Board (E4401-60103) 9320-6209
10 1 Installation Note E4411-90047

4 Installation Note E4411–90047
Tools Required
WARNING A High Pot Test—also known as High Potential or Dielectric Withstand
Test—is required after working on the high voltage section of the power
supply. Ensure suitable test equipment is available for this test before
performing this upgrade.
Figure 1 TORX Tool
WARNING Opening covers or removing parts is likely to expose dangerous voltages.
Disconnect the product from all voltage sources before opening covers.
WARNING The spectrum analyzer contains potentially hazardous voltages. Failure
to heed the safety precautions can result in severe or fatal injury.
CAUTION Electrostatic discharge (ESD) can damage or destroy electronic components. All
work on electronic assemblies should be performed at a static-safe workstation.
Refer to the documentation that pertains to your instrument for information
about static-safe workstations and ordering static-safe accessories.
Description Part Number
TORX Hand Driver—Size T10 8710-1623
TORX Hand Driver—Size T15 8710-1622
Soldering Iron and Solder

Installation Note E4411–90047 5
Procedure
Removing the Outer Case
1. Disconnect the spectrum analyzer power line.
2. Carefully place the analyzer on the work surface with the front frame facing down.
Refer to Figure 2.
3. Remove the four screws (1) that hold the rear frame (2) and outer case (4) in place.
4. Pull the instrument outer case and rear frame off toward the rear of the instrument.
CAUTION The Rear EMI Gasket (3) that clips onto the rear panel can come loose. Note the
correct position to reattach the gasket.
Figure 2 Outer Case, Rear Frame Removal

6 Installation Note E4411–90047
Removing the Inner Shield
1. Refer to Figure 3. Remove the 16 screws (2), (3), and (4) attaching the inner shield (1) to the chassis.
If the tracking generator option is installed, the screw labeled (4) will not be present. In that case,
there will be only 15 screws (2) and (3).
Figure 3 Inner Shield Removal

Installation Note E4411–90047 7
2. Refer to Figure 4. The inner shield (1) can now be removed from the chassis.
Figure 4 Inner Shield

8 Installation Note E4411–90047
Removing the Front Frame
Refer to Figure 5.
1. With the instrument still on its face, remove the two screws (1) on the bottom side of the instrument
that secure the front frame to the RF assembly.
2. Place the instrument with the top side facing up. Remove the two screws (2) that secure the front
frame subpanel to the chassis.
3. Slide the front frame (4) forward until it catches on the tabs (3) on the sides of the chassis.
Figure 5 Front Frame Assembly Removal

Installation Note E4411–90047 9
Removing the Power Supply Assembly
Refer to Figure 6.
1. Remove the vibration support bar (2) at the top rear of the instrument by pinching in the ends of the
bar and rotating upward. The support can be removed by sliding it out of the holes in each assembly.
CAUTION If forced, the vibration support can be broken; remove with care.
2. Remove the single screw (3) securing the A5 power supply assembly (4) to the chassis at the rear of
the instrument.
3. Carefully pull up on the power supply assembly to remove it from the motherboard connector.
Figure 6 Vibration Support

10 Installation Note E4411–90047
Removing and Modifying Power Supply Board
Refer to Figure 7.
WARNING Before opening the cover of the power supply, ensure that at least 5
minutes have elapsed since the line power has been disconnected from
the unit. Opening covers any soon is likely to expose dangerous voltages.
1. Remove the four screws (1) securing the top cover (2) to the power supply assembly.
2. Unplug the fan (5) from the power board (3). Remove the top cover with the fan (2).
3. Unplug the incoming power line (7) from the power board (3).
4. Remove the three screws (6) that secure the power board (3) to the casing.
5. Remove the power board (3) from the casing.
Figure 7 Power Supply Assembly 1

Installation Note E4411–90047 11
Refer to Figure 8 for steps 6 through 12.
6. Unsolder and remove C34, R38, and CR43 (1).
7. Solder the two 10 ohm resistors (0757-0346) in place of C34 and R38.
8. Place the insulation sleeve (0890-0099) over one lead of the 4700 pF capacitor (0160-4831). Turn the
board over. On the back of the board, solder the 4700 pF capacitor (0160-4831) from pin 2 of T1 to
the cathode pad (square pad) of CR43.
9. Unsolder and remove C86, R238, and C174 (3).
10.Solder the 1 ohm resistor (0698-8812) in place of R238.
11.Solder the 1000 pF capacator (0160-4574) in place of C86.
12.Place two 90°bends—as shown in Figure 8 at (2)—in one lead of the 4700 pF capacitor
(0160-4439). Insert the capacitor into the board in the place of C174 with the bent lead closest to the
edge of the board. Solder it in place.
Figure 8 Power Supply Assembly 2

12 Installation Note E4411–90047
Replacing Power Supply Board and Assembly
Refer to Figure 7 for steps 1 through 7.
1. Replace the power board (3) onto the casing, and secure with the three screws (6).
2. Place the new label (9320-6209) over the barcode label on the power board.
3. Remove the controller daughter board (E4401-60063) (4) from J7 and replace with the new
controller board (E4411-60090).
4. Plug in the incoming power line (7) to the power board (3).
5. Replace the power supply cover (2), with fan, on the power supply assembly. Make sure the lip on
the top cover catches underneath the bottom cover.
6. Replace the four screws (1) that secure the top cover to the power supply assembly. Torque to
101 N/cmN/cm (9-inch pounds).
7. Plug the fan connector (5) into the power supply board (3).
Refer to Figure 6 for steps 8 through 11.
8. Carefully plug the A5 power supply assembly (4) into the motherboard.
9. Place the new label over the barcode label (7121-7526) on top of the power supply assembly.
10.Replace the single screw (3) that secures the power supply (4) to the chassis.
11.Replace the vibration support (2) at the top rear of the instrument. Line up the tabs on the support
with the holes in each assembly and the rear blank panel. Slide the support sideways into the holes,
then rotate down until the ends clip into the power supply and the IF assemblies.
Replacing the Front Frame
1. Carefully slide the front frame toward the chassis, assuring the ribbon cable is not pinched between
assemblies, and the RF input connector lines up correctly with the opening in the front frame.
NOTE Make sure the water seal is still in place around the input connector (and around
the A2 tracking generator connector if the instrument has Option 1DN or 1DQ)
before reinstalling the front frame assembly.
Refer to Figure 5.
2. Replace the two screws (2) that secure the front frame to the chassis. Torque to 101 N/cm
(9-inch pounds).
3. Carefully place the spectrum analyzer on the work surface with the front frame facing down.
4. Replace the two screws (1) that secure the front frame to the chassis. Torque to 101 N/cm
(9-inch pounds).
Replacing the Inner Shield
Refer to Figure 3.
1. Carefully position the inner shield (1) on the instrument.
2. Replace the 16 screws (2), (3), and (4) attaching the inner shield (1) to the chassis. If the tracking
generator option is installed, the screw labeled (4) will not be present; there will be only 15 screws
(2) and (3). Torque to 101 N/cm (9-inch pounds).

Installation Note E4411–90047 13
Replacing the Outer Case
1. Replace the instrument outer case by matching the grill on the side of the case to the fan on the
power supply assembly.
2. Fit the leading edge of the case completely into the slot on the back of the front frame assembly.
Refer to Figure 2 for steps 3 through 5.
3. Replace the rear frame assembly (2) on the instrument.
NOTE The Rear EMI Gasket (3) that clips onto the rear panel can come loose. When
replacing the outer case, make sure the gasket is in the correct position.
In some cases, the Rear EMI Gasket may be misaligned, or the fingers may not be
bent far enough to make proper contact. Poor contact will negatively impact the
EMI performance of the instrument.
4. Check to make sure that all fingers of the Rear EMI Gasket (3) contact the rear panels of the
boards/blank panels. Each pair of fingers should contact the faceplate to its left and right,
respectively.
If the contacts of the Rear EMI Gasket are misaligned, remove the rear frame, loosen all the rear
card cage screws, power supply screw, IF screws, and option card screws, and move the whole group
of parts in the direction needed to ensure that the fingers of the gasket make contact with the rear
panels.
If the panels are properly aligned, but the EMI fingers do not reach the panels, remove the rear
frame and bend the fingers farther out to ensure that they make contact with the rear panels.
5. Use the four screws (1) to fasten the rear frame to the instrument. Torque to 247 N/cm (21-inch
pounds).
6. Using a pen with indelible ink, write the following on the E4411A serial number label, located at
the lower right side of the rear panel: SN E4411A-09 Installed.
After a Spectrum Analyzer Repair
A High Pot Test—also known as High Potential or Dielectric Withstand Test—is required after working
on the high voltage section of the power supply. In addition, after the spectrum analyzer power supply
has been upgraded, perform the related adjustments and performance verification tests. Refer to
Table 5-2 in Chapter 5 of the ESA-L1500A Spectrum Analyzer Service Guide for the related
adjustments and performance verification tests required for the A5 power supply assembly.