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Agilent Technologies 1141A, 1142A Probe Control and Power Module

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Service

Removing and Replacing Assemblies

Probe Control and Power Module

Use the following procedure to disassemble the probe control and power module.

WARNING Hazardous voltages exist on the power supply. To avoid electrical shock, adhere closely

to the following procedures.

1Remove the power cord.

2Remove four flathead screws and remove the top cover.

WARNING Be sure to reconnect the safety ground when reassembling the instrument.

3Unplug the safety ground from the tab on the rear panel of the instrument.

4Note the orientation of the knobs. Remove the two knobs.

5On the bottom of the instrument, remove the 5mm screw that fastens the

transformer support.

6Remove the following pan-head screws.

• Three directly on the PC board.

• Two on the ac input connector.

• Two on the heatsink.

7Remove the PC board. Slide it slightly forward so parts will clear the rear panel,

then lift the rear of the board out while sliding it backwards.

8Remove the two heatsink spacers from the standoffs that were directly under

the heatsink.

9Reverse the procedure to reassemble the control and power supply.

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 !