Agilent Technologies 85105A Option 50 Installations- und Betriebshandbuch

Part Number 85105-90023

Printed in USA August 2002

Agilent Technologies 85105A Option 50

Installation Instructions for

RF Switch Replacement Kit 85105-60047

Installation Note

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 notlimited

to, the implied warranties of merchantability and fitness for a particular purpose. Agilent Technologies

shallnotbeliableforerrors contained herein orfor incidentalorconsequential damagesin connection with

the furnishing, performance, or use of this material.

Installation Note 85105-90023 3

Description

This document details a procedure for replacing the DC-50 GHz RF switch (A24) in the

85105A mm waveguide controller. This procedure is necessary if the existing RF switch (A24)

is defective.

Parts List

NOTE The manuals mentioned in this document can be accessed on the internet by

searching for the part number of the manual at the following Web site:

http://www.agilent.com

For example, to access the Installation Note, go to the Web site and search for

“85105-90023”.

Products Affected: . . . . . . . . . . . . . . . . . . . . . . . . . 85105A mm waveguide controller Option 50

Serial Numbers: . . . . . . . . . . . . . . . . . . . . . . . . . . . 3146A00454 and below

To Be Performed By: . . . . . . . . . . . . . . . . . . . . . . (X ) Agilent Technologies Service Center

(X ) Customer or Personnel Qualified by Agilent

(X ) Agilent Personnel On-site

Estimated Installation Time: . . . . . . . . . . . . . . . . 1 hour

Quantity Description Part Number

1Connector, 14 pin DIP and cable, 3 conductor, 28 AWGa85105-60120

1 87222E Option 100,

coaxial transfer switch, 2.4 mm, DC to 50 GHza

a. These parts are shipped pre-assembled in the 85105-60047 RF switch replacement kit.

87222-60016

1Bracket—switcha85105-00024

4Screw, M2.5 x 6.0 mma0515-0366

2 Screw with lock washer, 4-40 x 0.250 inch 2200-0103

1 Installation note 85105-90023

4 Installation Note 85105-90023

A24 Removal Procedure

1. Turn off the 85105A mm waveguide controller and unplug the power cord from the back.

WARNING It is important to unplug the power from the back of the instrument

before proceeding to avoid personal injury.

2. Remove the top cover from the 85105A by loosening the screw on the top rear of the

instrument.

NOTE The screw is locked into the top cover. It will be necessary to check that the lid is

loose enough by pulling on the rear of the cover.

3. Loosen the three 2.4 mm semirigid coax cables from the existing RF switch (A24). Refer to

Figure 1 on page 5.

CAUTION Do not attempt to remove the three cables completely at this time, as this could

result in unnecessary bending of the semirigid coax cables.

Installation Note 85105-90023 5

Figure 1 Removal of old A24

4. Carefully remove the switch control cable from the J8 connector on the motherboard (refer

to Figure 1).

5. Remove the two screws that attach the RF switch to the switch bracket and remove the old

A24 (refer to Figure 1).

6. Carefully back the switch away from the three semirigid coax cables and remove the old

A24 (refer to Figure 1).

6 Installation Note 85105-90023

A24 Installation Procedure

1. Position the new switch and bracket assembly with the three soldered control cable

connections toward the bottom and front of the instrument. The bracket side with two

screw holes should be facing towards the existing bracket (refer to Figure 2).

NOTE The control cable terminals on A24 will be facing the front of the 85105A, and the

2.4 mm connectors will be facing the rear.

Figure 2 Installation of new A24 (side view)

new picture needed

Installation Note 85105-90023 7

Figure 3 Installation of the new A24 (top view)

2. Plug the control cable attached to the transfer switch into J8 on the motherboard (refer to

Figure 3).

3. Carefully attach the new A24 to the existing semirigid coax cables. Connect the lower coax

cable first. The top cables can then be easily inserted without damage. The cable attached

to port 1 will need to be bent slightly to fit (refer to Figure 2 on page 6).

Avoid unnecessary bending of the coax cables. Port 2 will be left open.

4. Two screws with lock washers are supplied with this kit. Insert the two screws (p/n

2200-0103) through the new bracket and into the existing bracket and tighten (refer to

Figure 2).

5. Torque the semirigid coax cable connectors to 8 in-lbs (refer to Figure 2).

new picture needed

8 Installation Note 85105-90023

A24 Verification Procedure

1. Set SW4 to OPEN on the A4, GPIB board assembly (p/n 85105-60014). Refer to Figure 4.

2. Plug in the power cord and turn on the 85105A mm waveguide controller power switch.

WARNING Hazardous voltages are present! Use care when working on a live

instrument to avoid personal injury.

3. Verify that the Port 2 “ON” green LED is illuminated on the A5, SW Driver board assembly

(p/n 85105-60005) and listen for audible click of A24 (refer to Figure 4).

4. Turn off power switch.

Figure 4 Testing of A24

Installation Note 85105-90023 9

5. Return switch 4 to the ‘closed’ position (refer to Figure 5).

6. Turn on the power switch and verify that the port 1 and port 2 “OFF” yellow LEDS are

illuminated on the A5, SW Driver board assembly (p/n 85105-60003). Refer to Figure 5.

Figure 5 Normal Operation

7. Turn off the 85105A power switch and unplug the power cord.

8. Reinstall the top cover and retighten the screw on the top rear of the instrument.

9. Return unit to service in system and verify system if needed.

10 Installation Note 85105-90023

Contacting Agilent

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