Troubleshooting 31
3
Troubleshooting
SHOCK HAZARD. Most of the troubleshooting procedures given in this chapter are performed with power
applied and protective covers removed. Such maintenance should be performed only by service trained
personnel who are aware of the hazards (for example, fire and electrical shock).
This instrument uses components which can either be damaged or suffer serious performance
degradation as a result of ESD (electrostatic discharge). Observe the standard antistatic precautions to
avoid damage to the components. An ESD summary is given in Chapter 1.
Introduction
This chapter provides troubleshooting and repair information for the power supply. Before attempting to troubleshoot the
power supply, first check that the problem is with the supply itself and not with an associated circuit. The verification tests
in Chapter 2 enable you to isolate a problem to the power supply.
Troubleshooting procedures are provided to isolate a problem to one of the circuit boards or a particular circuit. Figure 3-1
shows the location of the circuit boards and other chassis mounted components within the power supply. Once a problem
has been isolated to a circuit board, additional troubleshooting procedures are available to isolate the problem to the
defective component(s). Disassembly procedures are provided at the end of this chapter and should be referred to, as
required, in order to gain access to and/or replace defective components.
If a component is defective, replace it and then conduct the verification test given in Chapter 2.
Note Note that, when certain components are replaced, the supply must be re-calibrated (see "Post Repair
Calibration" later in this chapter). If the EEPROM chip U6 on the A3 Front Panel Board is replaced, the
supply must be initialized before it is re-calibrated. See "EEPROM Initialization" later in this chapter.
Chapter 5 in this manual lists all of the replaceable parts for the different Agilent series of power supplies. Chapter 6
contains schematics, test point measurements, and component location diagrams to aid you in troubleshooting the supply.
Test Equipment Required
Table 3-1 lists the test equipment required to troubleshoot the power supply. Recommended models are listed.
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