TDS 420A, TDS 430A & TDS 460A Service Manual
6-75
Troubleshooting
This section contains information and procedures designed to help you isolate
faulty modules in the oscilloscope. If a module needs to be replaced, follow the
Removal and Installation Procedures located on page 6--9. If servicing a
TDS 430A, follow the procedures for the TDS 460A, but ignore all references to
CH 3 and CH 4.
CAUTION. This oscilloscope operates over several ranges of line voltage (see
Source Voltage and Frequency on page NO TAG of Chapter 1, Specification).
Before stepping the line voltage from one range to a higher range, set the
principal power switch (rear panel) to its OFF position. Failure to do so can
damage the oscilloscope.
Diagnostics
The oscilloscope has two levels of internal diagnostics that focus on verifying,
adjusting, and, if need be, isolating faulty modules.
Both levels of internal diagnostics report any bad modules or interfaces. If the
diagnostics do find a bad module or interface, use the troubleshooting procedures
in this section to determine which module needs to be replaced.
The two levels of diagnostics are the short confidence set and an extended set
that tests the oscilloscope circuitry in-depth and takes more time. At power--on,
the oscilloscope automatically executes the short set. The extended set is
optional and is executed by using the following procedure:
Prerequisites: Power up the oscilloscope and allow a 20 minute warm-up before
doing this procedure.
1. Display the System diagnostics menu:
a. Press SHIFT;thenpressUTILITY.
b. Repeatedly press the main-menu button System until Diag/Err is
highlighted in the menu that pops up.
c. Repeatedly press the main-menu button Area until All is highlighted in
the menu that pops up.
2. Run the System Diagnostics: Press the main-menu button Execute; then
press the side-menu button OK Confirm Run Test.
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