Introduction
WARNING The information in this section is intended for qualified service personnel.
Some of these procedures may expose you to hazardous voltages. Do not per-
form these hazardous procedures unless you are qualified to do so.
This section of the manual will assist you in troubleshooting the Model 2000. Included are
self-tests, test procedures, troubleshooting tables, and circuit descriptions. It is left to the discre-
tion of the repair technician to select the appropriate tests and documentation needed to trouble-
shoot the instrument. This section is arranged as follows:
• Repair considerations — Covers some considerations that should be noted before mak-
ing any repairs to the Model 2000.
• Power-on test — Describes the tests that are performed on memory elements each time
the instrument is turned on.
• Front panel tests — Provides the procedures to test the functionality of the front panel
keys and the display.
• Principles of operation — Provides support documentation for the various troubleshoot-
ing tests and procedures. Included is some basic circuit theory for the display board,
power supply, digital circuitry and analog circuitry.
• Display board checks — Provides display board checks that can be made if front panel
tests fail.
• Power supply checks — Provides power supply checks that can be made if the integrity
of the power supply is questionable.
• Digital circuitry checks — Provides some basic checks for the digital circuitry.
• Analog signal switching states — Provides tables to check switching states of various
relays, FETs, analog switches and the A/D multiplexer for the basic measurement func-
tions and ranges.
• Built-in test overview — Summarizes the built-in tests, which can be used to test and ex-
ercise the various digital and analog circuits.
• Built-in test documentation — Provides a detailed analysis of each built-in test.
2-2 Troubleshooting
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