Tektronix WFM8200, Service Manual

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General Maintenance
Troubleshooting
The procedures in this section will help you trace the root cause of a problem back
to one of the replaceable modules. In general, this is a board-level replacement
but there are a few components on some boards that are replaceable.
WARNING. Before performing this or any other procedure in this manual, read the
General Safety Summary and Service Safety Summary found at the beginning of
this manual.
To prevent possible injury to service personnel or damage to electrical component,
refer on how to prevent ESD. (See page 4-1.).
Getting Started This procedure consists of two main sections: the fi rst section contains the
Symptoms and Causes table, and the second section contains a set of Detailed
Troubleshooting Procedures . The table lists common problems and should help
you identify the problem or it may direct you to one of the detailed troubleshooting
procedures in the second section. If you do not
fi nd your instrument’s problem in
the table, or if no speci fi c problem was reported by the user, then follow the steps
in the Unknown Problem section in the Symptoms and Causes table.
The WFM8200 and WFM8300 Waveform Monitors are highly con fi gurable and
behavior is sometimes complex. Before troubleshooting in-depth, verify that:
The installed options are as expected. See CONFIG > Utilities > View
Instrument Options
The current settings support the expected behavior. A good fi rst step is to
recall the Factory Presets. To do this, press PRESET > Recall Preset > Recall
Factory Preset.
To properly test this instrument, you must have appropriate signal sources.
Depending on what portion of the instrument you are testing, this might include
Composite video, Serial Digital Video, Analog Audio, or Digital Audio. In some
cases, you may also need receivers or an oscilloscope to check outputs.
These instruments consist of several boards and major components. Some of these
are optional, as shown below. The objective of this troubleshooting guide is to
isolate a problem to a module or board so it can be replaced. This guide does not
provide information to troubleshoot to the component level.
Standard boards and modules:
Power Supply
Display Assembly (LCD, Front Panel board with buttons, LEDs, and knobs)
Main board
WFM8200 and WFM8300 Waveform Monitors Service Manual 4–5