Agilent Technologies 66000A, Service Manual, Page: 21 / 53

Troubleshooting 21
4
Troubleshooting
This chapter provides troubleshooting and repair information for the Agilent 66000A MPS Mainframe. Before attempting to
troubleshoot the mainframe, ensure that the problem is not with an external circuit or application, an MPS Power Module,
the GPIB controller, the application program, or the input power line.
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).
Troubleshooting Sequence
1. Verify that the Modular Power System mainframe is at fault.
2. Use the flowcharts to locate the mainframe functional block at fault.
3. Troubleshoot the functional block per flowchart instructions.
Troubleshooting tests built into firmware are provided to isolate a problem to one of the circuit boards or to a particular
circuit on the board. Once a problem has been isolated to a particular circuit, suggestions are given as to what component
may be at fault.
This instrument uses components that can be damaged or suffer serious performance degradation as a
result of ESD (electrostatic discharge). Observe the standard anti-static precautions discussed in
Chapter 1 to avoid damage to components.
Accessing the Flowcharts
If You Experienced a Selftest Failure
If you experienced a selftest failure as described in Chapter 2, Table 2-1, disassemble the pc boards and proceed directly to
the flowchart indicated in the "Troubleshooting Procedure" columns of Table 2-1.
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Figure 4-1 - Overall Troubleshooting.
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Figure 4-2 - Bias Troubleshooting.
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Figure 4-3 - ROM & Microprocessor Troubleshooting.