Audio I/O Algorithm (8 In - 8 Out); Functional Diagnostic Test Scripts - Lexicon 960L Service Manual

IO Card Info:
Card 0: Clock Version X
Card 1: unknown
Card 2: AES Version X
Card 3: Analog In Version X
Card 4: Analog Out Version X
Press 0 for a list of tests.
>
The text below Card 0 Configuration, verifies that a reverb card is present and can be identified by the
diagnostics. After that the cards in the I/O cage are identified. At this point if the reverb card cannot be
identified, look at the 4 leftmost LEDs on the reverb card. They should be lit. If the LEDs are not lit correctly
then the reverb card has a problem. If the reverb card has this serious a problem that it cannot be initialized
then the most likely problem is with he 56301 and associated circuitry.
If the cards are all recognized then the diagnostics can be run. There are 10 sets of diagnostic scripts
available with the 960L. In addition custom scripts can be written and run from the floppy drive. The 10 built-
in scripts are run by pressing the numbered button corresponding to the script desired to be run and then
pressing the ENTER button. For a description of the scripts and their operation see the section labeled

Functional Diagnostic test Scripts.

Audio I/O Algorithm (8 In - 8 Out):

The audio data must be generated from an external source, such as an Audio Precision. The audio I/O
program is provided in the audio preset program with the parameters modified to produce a dry signal path.
Three audio paths are tested. Analog in to digital out, (A-D), digital in to analog out, (D-A), and analog in to
analog out, (A-A). Digital in to digital out, (D-D) is not tested directly during manufacturing proof of
performance but is available as a troubleshooting tool to repair defective AES cards.
User Audio Testing:
The user will be processing audio through the 960L and LARC2 and a system all the time. The user will
always be evaluating audio performance of the system. If the user detects a problem, the hardware
diagnostics can be executed to see if the hardware is working. If, however, a problem is not detected, then
if the user has the necessary equipment the Audio I/O program can be executed to see if the 960L and
LARC2 versus something else in the users system is the problem.
Functional Diagnostic Test Scripts
Resident Scripts:
To perform the functional diagnostics, scripting files in ASCII text are executed. These files function like
DOS batch files in that they contain the test or list of tests to be executed, one after the other. There are 10
built-in resident scripts. They are executed by pressing the corresponding numbered button on the LARC2
and then pressing the ENTER button. For example to run the script number 3, press the 3 button and then
press the ENTER button. The 10 scripts that are resident with the 960L are described as follows:
Script 0: Lists the menu, displays a list of available scripts on the LARC2.
Script 1: Executes the entire set of diagnostic tests.
DB Version . . . . 2
Lexicon
6-3