Agilent Technologies 6684A, 6680A, 6683A Introduction Localizing the Problem, Chapter Organization

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Troubleshooting

Shock Hazard: Most of the procedures in this chapter must be performed with power applied and protective covers removed. These procedures should be done only by trained service personnel aware of the hazard from electrical shock.

This instrument uses components that can be damaged or suffer serious performance degradation due to ESD (electrostatic discharge). Observe standard antistatic precautions to avoid damage to the components (see Chapter 1).

Introduction

Localizing the Problem

This chapter provides troubleshooting and repair information for the power supply. Before beginning troubleshooting procedures, make certain the problem is in the power supply and not with an associated circuit, the GPIB controller (for GPIB system power supplies), or ac input line. Without removing the covers, you can use the Verification tests in Chapter 2 to determine if the power supply is operating normally.

Chapter Organization

The information in this chapter is organized as follows:

Topic	Information Given
Test Equipment Required	Equipment required for completing all the tests in this chapter.
Troubleshooting Procedures	A series of flow charts for systematic location of defective boards, circuits, and
	components. An explanation of the error codes and messages generated during the
	power-on selftest. Signature analysis techniques for troubleshooting the digital circuits
	on the front panel, primary GPIB, and secondary interface circuits. Specific
	paragraphs for:
	• Checking the bias and reference supplies.
	• Troubleshooting the CV/CC status annunciators.
	• Troubleshooting the A3 FET board.
Post-Repair Adjustments	Calibration and EEPROM initialization procedures required after the replacement of
	certain critical components.
Disassembly Procedures	Gaining access to and/or replacing components.

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