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Agilent Technologies 1141A, 1142A Removing and Replacing Assemblies

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Service

Removing and Replacing Assemblies

Removing and Replacing Assemblies

This section contains procedures for the removal and replacement of major assemblies.

CAUTION Never remove or install any assembly with the instrument power ON. Component

damage can occur.

Differential Probe

Use the following procedure to remove and replace the amplifier PC board in the

differential probe.

CAUTION ELECTROSTATIC DISCHARGE can damage electronic components. Use grounded

wrist straps and mats when servicing the probe.

CAUTION Handle the differential probe carefully once it has been disassembled. If unsupported,

the weight of the cable can put strain on the PC board.

Disassemble Probe

1Remove the probe tip caps and probe tips.

2Loosen the probe clamp ring at the cable end of the probe (1/4 turn counter-

clockwise) and slide it down the cable.

3Remove the bottom cover.

aAt the cable end of the probe, separate the covers about one centimeter (1/2 inch).

bSlide the bottom cover toward the cable end of the probe until the locator pins at

the probe input clear the holes. Then, remove the cover.

Note the way the cable strain relief is keyed and held at the rear of the top cover.

4Remove the probe top cover.

The ground screw passes through the top cover and PC board and screws into the ground

block.

aRemove the ground screw on the top of the probe.

At the cable end, the PC board fits over the pins in the top cover.

bLift the board off of the pins and slide it in the direction of the cable until the input

connectors clear the front of the probe.

5Un-solder the two connections where the coaxial output cable connects to the

PC board.

6Disconnect the cable connector from the probe PC board.

Contents

Main Agilent Technologies 1141A Differential Probe and 1142A Probe Control and Power Module Page Contents Page Introduction Accessories Supplied Page Accessories Available The following accessories can be ordered. To inspect the probe To inspect the probe Using the probe with other instruments Recommended Test Equipment Setting up the probe Initial Adjustment Page Using the Accessories Page Page Page Page Grounding Coupling Functions Page Page Remote operation Cleaning Requirements Differential Amplifiers and CMRR Page Page Equipment Required Introduction Equipment Required The Test Board The Test Board Calibration Tests dc Gain Accuracy dc Gain Accuracy Page Page Vout Vin --------------Vout1Vout2 ----------------------------------= () 2 Vin Page Page Bandwidth Page CMRR Test Page Page Calibration Test Record Probe Adjustment Adjustments Probe Adjustment Page Adjustment Procedure Page Page Page Page Page Adjustment Procedure Attenuator Adapter Adjustment Attenuator Adapter Adjustment Page Page Page Page Introduction Performance Specifications and Characteristics Performance Specifications and Characteristics Page Page General Characteristics General Characteristics Theory of Operation Theory of Operation Differential Probe Control and Power Module Theory of Operation Attenuator Adapters Page Service Policy Troubleshooting Probe Troubleshooting Probe Control and Power Module Troubleshooting Page Removing and Replacing Assemblies Differential Probe Page Probe Adapters Page Probe Control and Power Module Replaceable Parts Parts List Ordering Information Direct Mail Order System Manufacturers Codes Page Page Page Page Page Page 1141A and 1142A Replaceable Parts Page Page Page Page Page Locator Table for Control and Power Supply Page Page Index Agilent Technologies P.O. Box 2197 1900 Garden of the Gods Road Notices Manual Part Number Warranty Technology Licenses Restricted Rights Legend Product Safety Notices Warnings To clean the instrument Safety Symbols !