Functional Tests; Midi Tests; Listening Test - Lexicon 960L Service Manual

1. Connect a balanced XLR audio cable between the digital function generator and the 960L # 1-2 AES
Input.
2. Connect a balanced XLR audio cable between the 960L # 1 Audio Output and the distortion analyzer.
3. Apply a 997Hz sinewave @ -1 dBFS.
4. Set the distortion analyzer for a 0dB reference.
5. Enable the Audio Band Pass filter on the distortion analyzer.
6. Lower the input by 60dB to -61dBFS.
7. Verify the THD+N at the # 1 output to be < -110 dB.
8. Move the audio output cable to the # 2 Output and repeat the test.
9. Repeat the test for the remaining Input /Outputs pairs 3-4, 5-6, and 7-8.

Functional Tests:

Midi Tests:

Setup
1. This test will require 1 Midi cable. The cable is connected to the Midi In and Out connector on the back
of the 960L creating a loop that the internal diagnostics requires to perform the test.
2. The 960L must first be placed into Diagnostic mode. This is done by powering on the 960L's main
power switch on the rear panel, then immediately pressing and holding down the Program and Machine
buttons on the LARC2 for 2 seconds. When the LARC2 displays "Requesting Menu Mode ...", the
buttons can be released. The display will take about two minutes, then it should state the following:
960L Boot Menu
[Note: ### are placeholders for actual values which may vary]
1) Run 960L
2) Update 960L Software
3) Update LARC2 Boot ROM
4) Update LARC2
5) 960L Diagnostics
Can't lock CD Drive: Access is denied
3. Press the # 5 button to enter the Diagnostics.
4. The display will scroll through some information then settle. At the bottom of the display it will read,
Press 0 for a list of tests.
5. Press the # 9 on the LARC2 then the Enter button.
6. If the Midi circuitry is good the display will read
MIDI Test : Passed
All test PASSED
If it fails then the display will read
MIDI Test : Failed : No data received
One or more tests failed
7. To exit Diagnostics, power off, then power on the unit.

Listening Test:

Setup:
1. Connect the two audio XLR male cables from the low distortion oscillator to Analog Inputs marked 1
and 2 on the back of the 960L.
2. Connect the two audio XLR female cables from the Headphones Amplifier to the Analog Outputs
marked 1 and 2 on the back of the 906L.
3. Set the oscillator to 220Hz @ 2.5VRMS.
- Version ### Speed ### BIOS date ##/##/##
Lexicon
4-9