Extended Diagnostics Tests; User Interface - Lexicon RV-8 Service Manual

EXTENDED DIAGNOSTIC TESTS
The extended diagnostic tests are accessible by pressing and holding the ZONE2 DVD2 & ZONE3 DVD2
front panel buttons when powering on a RV-8. The audio outputs (analog and digital) are muted. When
the VFD on the unit displays "LEXICON," the front panel buttons can be released. After the model banner
is briefly displayed on the VFD, the display will indicate:
"DIAGS MENU
FUNCTIONAL TESTS"
The extended diagnostics can also be entered via the serial debug port by first entering the debug
program. Typing "debug" when connected to the serial port accesses the debug program. The debug
program is case sensitive. In addition the extended diagnostics can be entered by sending "ed," which
stands for extended diagnostics, to the unit via the serial debug port during the first ten seconds after
powering on the unit.
After extended diagnostics are entered, use the front panel encoder, Mode
navigate through the diagnostics. The front panel encoder is rotated to display the desired tests. The
Mode button is pressed to move down through the menu selections and to execute the desired
diagnostic test. The Mode
button (Esc) on a computer keyboard.
Types of Diagnostic Tests
The extended diagnostic tests fall into two categories. The first category is for tests required to
functionally verify the RV-8. These tests are performed on every unit. These will be referred to as
Functional Diagnostic tests. The second category is for troubleshooting defective units. These tests are
only utilized if there is a failure. The troubleshooting tests can be used to help isolate the source of
failures so that units can be cost effectively fixed. These tests are referred to as Repair diagnostics.
Two groups of tests are executed for every RV-8. These are the Loop Tests and the Functional Test
Suite. The Loop Tests and the Functional suite comprise the automated sets of tests used to verify proper
operation of every unit. Each of the tests in these suites are run in order unless there is a failure. The
failing test will loop to allow the electrical signals to be active for troubleshooting. You can optionally
continue to run the other diagnostic tests in the suite. The Repair suite allows you to run particular tests
for troubleshooting.

User Interface

The user interface consists of a set of menus. The top menu is the "DIAGS MENU" and is shown in the
top line of the VFD display. To view the available menu items, turn the encoder knob in either direction
and the menu choices will appear in the second row. When the desired menu item is shown, press the
Mode button. This selects the menu item. If the item is another menu, the menu's title now appears in
the top line of the VFD and its menu items are in the second row. If a test is selected, the test name will
appear in the top line and the results or information to run the test will be on the second row. Once a test
is finished, or to get out of a menu, press the Mode
The group tests are the diagnostics, in which if a test passes, the diagnostics automatically execute the
next test. Group tests are the Power-On Diagnostics and the Functional Test suite. If one of the group
tests is selected, each test in the group is automatically run if the current test passes. Upon successful
completion of the group tests, the VFD will either display "Pass" or "Fail" and come out of the test group
to the menu, or it will continuously loop.
If a test fails, the VFD, and front panel LEDs, will attempt to indicate the failed test. The test will attempt to
loop to keep the signal lines active for debugging purposes. If an individual test is selected, it will
continuously run and report if it passes every time it successfully completes the test. If the test fails, it will
attempt to loop to keep the signal lines active for debugging purposes. In addition, test progress and
failure information is available via the serial debug port. Specific failure information will depend on the test
5-8
button is used to move back through menu selections similar to an escape
button.
RV-8 Service Manual
and Mode buttons to