Lexicon
4-5
5. At the back right hand corner of the card locate the FB1. Measure the +12 volts here and verify the
voltage is +12VDC ± .6VDC.
6. Next locate FB2. Measure the -12 volts here and verify the voltage is -12VDC ± 1.2VDC.
7. Using the same ground reference measure pin 3 of U3 (+ 5 VA). Verify the voltage is +5VDC ± .25VDC.
8. Locate the + 5 VD test point on the left side of the card just to the left of U1. Using the ground reference
marked GNDD2 just to the right of the + 5 VD verify the voltage is +5VDC ± .25VDC.
AES Input /Output Card Voltage Test:
The supply being tested on this card will be the +5VD provided by the main supply via the backplane.
1. Before powering on the 960L remove the AES Input/Output card from the rear of the chassis.
2. Insert the I/O extender card and install the AES Input/Output card into the extender card.
3. Power on the 960L.
4. Locate the ground reference test point marked GND1 just above U3.
5. Locate test point marked + 5 V to the right of the GND1 test point.
6. With the DMM verify the voltage is +5VDC ± .25VDC.
Input/Output Clock Generator Card Voltage Test:
The supplies being tested on this card will be the +/-12 VSUP and the +5VD provided by the main supply
via the backplane.
1. Before powering on the 960L remove the Input/Output Clock card from the rear of the chassis.
2. Insert the I/O extender card and install the Input/Output Clock card into the extender card.
3. Power on the 960L.
4. For a ground reference locate test point marked GND2 on the right side of the card.
5. Locate the ferrite bead FB3 at the back of the card just to the right of the connector and measure the
+12 volts. Verify the voltage is +12VDC ± .6VDC.
6. FB4 is next to FB3. Measure the -12 volts here. Verify the voltage -12VDC ± 1.2VDC.
7. Locate the ground reference test point marked GND1 on the left side of the card just to the left of U1.
8. Locate test point marked + 5 V just below U1.
9. With the DMM verify the voltage is +5VDC ± .25VDC.
Audio/Functional Tests Setup*:
1. Power on the 960L with the main power switch and wait for the Power on diagnostics cycle to finish.
2. On the Larc2, press the Control Button. The Control Mode screen will appear at this time.
3. Press the #1 button to set the clock source to Internal. Note: for any "Digital In" tests, you will need to
return to this screen and select Source #3, AES/EBU.
4. Press the Right arrow button to jump to the Rate page.
5. Press the #2 button to select a 48kHz sample rate.
6. Press the Soft button labeled CONFIG under the display.
7. Press the #4 button. This will highlight the 1-8in/8out setup for Diagnostics.
8. Press the Edit button, the screen will then display the Edit Mode page
9. Press the Soft button labeled Algorithm, the display will then read Algorithms Options Enabled.
10. Press the Soft button labeled Select, a small box will open with 1-OctalThru stated.
11. Press the #1 button, then the Enter button this will load the Diagnostic 1-8in/8out setup.
12. Press Control and then the ►key to highlight Inputs.
13. Press the + key to toggle the state to AN (Analog). Note: for any "Digital In" tests, you will need to
return to this screen and toggle the state to AES (Digital).
14. Set the distortion analyzer to measure VRMS.
*Note: The following tests should also be performed at the 44.1kHz and 96kHz sample rates. Prior to
performing the following tests at each sample rate, you must perform the previous set-up procedure
substituting the indicated sample rate in step 5.
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