Using the 20/20 AD | Lexicon |
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CAUTION
These instructions are for use by qualified personnel only.
Before opening the 20/20 AD, REMOVE THE POWER CORD. You may be exposed to hazardous voltages even if power to the unit is turned off.
WARNING
Turn off power and REMOVE THE POWER CORD
before opening the unit.
Take a moment to study the figure below. This diagram shows the terminating and grounding of input signals for the unit, and explains the function of most of the jumpers on the 20/20 AD Main pc board. The configuration shown illustrates the jumper settings when the 20/20 AD is shipped from the factory.
| XLR |
| CHASSIS GROUND |
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| CONNECTOR | ANALOG IN |
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| 1 |
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| W1 |
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| W9 |
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| 2 |
| + |
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| W11 |
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| 3 |
| - | XLR | |
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| 600 OHM | W13 | |||
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| W2 |
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| CONNECTOR | |
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| W10 |
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| AES OUT |
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| W12 |
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| W14 |
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| 1 |
SHIELDED |
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| W26 | 2 |
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| W27 | 3 | |
TWISTED PAIR |
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| AES SYNC IN |
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| SHIELDED |
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| TWISTED PAIR |
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| 1 |
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| W18 |
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| 2 |
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| RCA |
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| 3 |
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| CONNECTOR |
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| S/PDIF OUT | |
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| W17 110 OHM |
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| XLR |
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| CONNECTOR |
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| 75 OHM |
| BNC |
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| SYSTEM GROUND | COAXIAL |
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| CONNECTOR | WORD CLOCK IN |
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| J13 |
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75 OHM |
| W16 |
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COAXIAL |
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| 75 OHM |
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| CHASSIS CONNECTED TO |
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| EARTH GROUND |
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| THROUGH POWER CABLE |
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| OR GROUND STRAP |
Jumper settings
(as set at the factory)
10