Agilent Technologies HP 85420E Installation and operation manual

HP/Agilent 85420E/85460A
High Frequency Filter Assembly
Replacement Kit Installation Note
Part number: 85460-90030
Printed in USA
April 2000

2 85420E/85460A High Frequency Filter Assembly Replacement Kit
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
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.
© Copyright Agilent Technologies, Inc. 1995, 1999, 2000

85420E/85460A High Frequency Filter Assembly Replacement Kit 3
High Frequency Filter Assembly Replacement Kit
Introduction
This kit contains a replacement HF Filter Assembly (A9).
Installation Kit Parts List
High Frequency Filter Assembly Replacement Kit Contents
Tools Required:
T-10 TORX Driver, T-15 TORX Driver, 5/16 Open-end Wrench
Calibration and Verification
Refer to the 85460A and 85420E Service Guide for the appropriate adjustment routines and
performance verification tests that must be run after replacing the HF Filter Assembly. (Refer to
Chapter 2 “Making Adjustments” Table 2-2, A9 High Frequency Filters Board Assembly.)
Products Affected:......................... HP/Agilent 85420E
HP/Agilent 85460A
Serial Numbers: . . ......................... All
Options:................................. none
To Be Performed By: . . . . . . . . . . . . . . . . . . . . . . (X) Agilent Service Center
(X) Personnel Qualified by Agilent Technologies
Estimated Installation Time:................ 1.0 Hours
Estimated Verification Time: . . . . . . . . . . . . . . 5.0 Hours
Item Quantity Description Part Number
1 1 HF Filter Assembly 85460-60030
2 1 Installation Note 85460-90030

4 85420E/85460A High Frequency Filter Assembly Replacement Kit
Remove the Instrument Cover
WARNING These servicing instructions are for use by qualified personnel only. To avoid
electrical shock, do not perform any servicing unless you are qualified to do
so.
The opening of covers or removal of parts is likely to expose dangerous
voltages. Disconnect the instrument from all voltage sources while it is being
opened.
The power cord is connected to internal capacitors that may remain live for
5 seconds after disconnecting the plug from its power supply.
CAUTION To prevent damage to the front-frame, use a soft cloth or towel between the
work surface and the front-frame.
Removal 1. Disconnect the instrument from ac power.
2. Place the instrument on the work surface with its front panel down.
3. Remove the four rear-feet screws using a Torx screwdriver.
4. Pull the cover off towards the rear.
Figure 0-1 Instrument Cover Replacement

85420E/85460A High Frequency Filter Assembly Replacement Kit 5
Remove the A9 HF Filter Assembly
1. Place the instrument with the top facing up on the work surface.
2. Remove eight screws on the front to access the components underneath
the top lid (1). Refer to Figure 0-2 on page -6.
3. Disconnect the five cables that go to the A9 HF Filter assembly (2).
Refer to Figure 0-3 on page -vi.
4. Disconnect the ribbon cable (3) from the HF filter assembly.
5. Remove the six screws that attach the HF filter housing to the front
strut (4).
6. Lift the housing out of the instrument.

6 85420E/85460A High Frequency Filter Assembly Replacement Kit
Figure 0-2 A9 HF Filters Replacement, Removing Lid Screws
Figure 0-3 A9 HF Filters Replacement, Lid Removal

85420E/85460A High Frequency Filter Assembly Replacement Kit 7
Replace the A9 HF
Filter Assembly 1. Place the A9 HF filter board assembly into the instrument. Refer to
Figures 0-2 and 0-3 on page -vi.
2. Connect the ribbon cable (3) to the HF filter.
3. Replace the six screws that attach the HF filter housing to the front
strut (4).
4. Connect the five cables that go to the HF filter assembly (2).
5. Replace the eight screws on the front (1).
Replace The
Instrument Cover
CAUTION To prevent damage when replacing the instrument cover, remember the
following:
Place a soft cloth or towel between the work surface and the front-frame.
Ensure that cables do not bind between the instrument cover and its internal
assemblies.
1. Disconnect the instrument from ac power.
2. Place the instrument on the work surface with its front panel down.
3. Replace the instrument cover assembly by matching the seam on the
cover with the bottom of the instrument.
4. Fit the leading edge of the cover completely into the slot on the back of
the front-frame assembly. The cover should fit snugly against the EMI
gasket in the slot.
5. Replace and tighten the four rear-feet screws using a Torx screwdriver.