Agilent Technologies 6612B, Руководство по обслуживанию, Страница: 21 / 74

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3
Troubleshooting
Introduction
WARNING: 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).
CAUTION: 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.
This chapter provides troubleshooting and repair information for the dc power supply. Before attempting to
troubleshoot the dc 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 dc power
supply. Troubleshooting procedures are provided to isolate a problem to one of the circuit boards or a
particular circuit. Figure 3-2 shows the location of the circuit boards and other major components of the
unit. If a problem has been isolated to the A1 Control 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 calibrated (see "Post
Repair Calibration" later in this chapter). If the A2 Interface Board is replaced, the supply
must be initialized before it is calibrated. See "Initialization" later in this chapter.
Chapter 5 lists all of the replaceable parts for the power supplies. Chapter 6 contains schematics, test point
measurements, and component location diagrams to aid you in troubleshooting the supply.