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Troubleshooting
Introduction
5
5-3
5-1. Introduction
Information in this section begins with guidance in using self-diagnostics fault codes to
isolate a faulty module. The descriptive text helps to quickly locate the source of a fault.
Further on, under Component Level Troubleshooting, techniques for isolating faulty
components or circuits are described. The Component Level Troubleshooting is only for
qualified service personnel who do not wish to replace a faulty module through the Fluke
Module Exchange Program. (Refer to Section 1 for module exchange instructions.)
Warning
To avoid electric shock, disconnect all cables from the output
and sense binding posts and do not touch binding post during
self diagnostics.
5-2. Interpreting Diagnostic Fault Codes
Run self diagnostics by pressing the "Setup Menus" then the "Self Test & Diags"
softkey.
Note
Self test diagnostics of the analog circuitry are carried out with the
5700A/5720A Series II binding posts open circuited. (Cables and test
equipment left connected to the binding posts have no effect.)
Test routines connect specific points to the SDL or RCL line and measuring for an
expected voltage and tolerance. The SDL and RCL lines are routed to the adc circuit on
the DAC assembly for measurement.
Fault code descriptions generally indicate the instrument’s test configuration, point being
measured, expected voltage, and probable assembly which is at fault. In some cases, an
addition manual measurement may be required to determine the faulty assembly. These
manual measurements are Noted with the related fault code description. In all cases it is
assumed that the Motherboard assemblies are fully operational. Power Supply faults
assume that other, non-power supply related assemblies are not loading down the Power
Supply.
2700 A7: 8255 Control Word
The diagnostics software reads the control word of the 8255 IC on the Current/Hi Res
assembly. A failure indicates the Current/Hi Res assembly (A7) is probably at fault.
2701 A7: 8255 Port a Fault
The diagnostics software writes and reads data to port A of the 8255 IC on the
Current/Hi Res assembly. A failure indicates the Current/Hi Res assembly (A7) is
probably at fault.
2702 A7: 8255 Port B Fault
The diagnostics software reads port B of the 8255 IC on the Current/Hi Res assembly. A
failure indicates the Current/Hi Res assembly (A7) is probably at fault.
2703 A7: 8255 Port C Fault
The diagnostics software reads port C of the 8255 IC on the Current/Hi Res assembly. A
failure indicates the Current/Hi Res assembly (A7) is probably at fault.