Table Of Contents - Lexicon 960L Service Manual

Chapter 1 Reference Documents, Required Equipment............................. 1-1
Reference Documents............................................................................................................................. 1-1
Required Equipment................................................................................................................................ 1-1
Tools .................................................................................................................................................... 1-1
Test Equipment.................................................................................................................................... 1-1
Chapter 2 General Information ................................................................... 2-1
Periodic Maintenance .............................................................................................................................. 2-1
Ordering Parts ......................................................................................................................................... 2-1
Returning Units to Lexicon for Service .................................................................................................... 2-1
Chapter 3 Specifications............................................................................. 3-1
960L Mainframe....................................................................................................................................... 3-1
LARC2 User Interface ............................................................................................................................. 3-3
Chapter 4 Performance Verification............................................................ 4-1
Initial Inspection and checkout: ............................................................................................................... 4-1
960L Mainframe: .................................................................................................................................. 4-1
LARC2 controller:................................................................................................................................. 4-1
Cables:................................................................................................................................................. 4-1
Power Supplies: ................................................................................................................................... 4-1
Audio/Functional Tests Setup*: ............................................................................................................... 4-5
I/O Gain Tests ......................................................................................................................................... 4-6
Analog In to Analog Out Audio Gain Test: ........................................................................................... 4-6
Analog In To Digital Out Audio Gain Test: ........................................................................................... 4-6
Digital Input to Analog Output Gain Test:............................................................................................. 4-6
Frequency Response: ............................................................................................................................. 4-6
Analog In to Analog Out Frequency Response Test:........................................................................... 4-6
Analog In To Digital Out Frequency Response Test:........................................................................... 4-6
Digital In To Analog Out Frequency Response Test:........................................................................... 4-7
THD+N Measurement:............................................................................................................................. 4-7
Analog In to Analog Out THD+N Test:................................................................................................. 4-7
Analog In to Digital Out THD+N Test: .................................................................................................. 4-7
Digital In to Analog Out THD+N Test: .................................................................................................. 4-7
Crosstalk Tests:....................................................................................................................................... 4-8
Analog In to Digital Out Crosstalk Test: ............................................................................................... 4-8
Digital In to Analog Out Crosstalk Test: ............................................................................................... 4-8
Dynamic Range Tests: ............................................................................................................................ 4-8
Analog In to Analog Out Dynamic Range Test: ................................................................................... 4-8
Analog In to Digital Out Dynamic Range Test:..................................................................................... 4-8
Digital In To Analog Out Dynamic Range Test: ................................................................................... 4-8
Functional Tests: ..................................................................................................................................... 4-9
Midi Tests:............................................................................................................................................ 4-9
Listening Test:...................................................................................................................................... 4-9
Lexicon Audio Precision ATE Summary ............................................................................................ 4-11
Chapter 5 Service Notes............................................................................. 5-1
Motherboard - lithium battery................................................................................................................... 5-1
Power Supplies........................................................................................................................................ 5-1
Symptoms of possible power supply failures ....................................................................................... 5-1
Larc2 Meter Display LED Handling ......................................................................................................... 5-1
Removal and Replacement of Larc2 Piezo Transducer .......................................................................... 5-1
For units with the transducer soldered (Rev 5 PCB and up): ............................................................... 5-1
For units with the transducer epoxied (Rev 4 PCB and below):........................................................... 5-1
Female RS-422 Wraparound Plug: ......................................................................................................... 5-3
Male RS-422 Wraparound Plug............................................................................................................... 5-4

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