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960L
Multi-Channel
Digital Effects System
Service
Manual
960L Multi-Channel Digital Effects System Service Manual
960L Multi-Channel Digital Effects System Service Manual
960L Multi-Channel Digital Effects System Service Manual
Lexicon

Table of Contents
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
960L Multi-Channel Digital Effects System Service Manual

Chapter 6 Troubleshooting ......................................................................... 6-1
Diagnostics...............................................................................................................................................6-1
Overview...............................................................................................................................................6-1
960L Diagnostics: .................................................................................................................................6-1
960L Diagnostic User Interface: ...........................................................................................................6-2
Audio I/O Algorithm (8 In - 8 Out): ........................................................................................................6-3
Functional Diagnostic Test Scripts .......................................................................................................6-3
960L Setup for Functional Diagnostic Tests .........................................................................................6-4
960L Power On Diagnostic Descriptions: .............................................................................................6-4
960L Functional Diagnostic Descriptions:.............................................................................................6-5
960L Troubleshooting Tools: ..............................................................................................................6-16
Global Commands: .............................................................................................................................6-17
LISTING of RESIDENT SCRIPTS ......................................................................................................6-18
LARC2 DIAGNOSTICS ..........................................................................................................................6-24
Debug Port:.........................................................................................................................................6-25
POWER ON DIAGNOSTICS:.................................................................................................................6-26
Power On Diagnostics Sequence: ......................................................................................................6-26
Power On Self Tests:..........................................................................................................................6-28
INTERACTIVE DIAGNOSTICS: .............................................................................................................6-33
Self Test:.............................................................................................................................................6-34
LCD Test:............................................................................................................................................6-35
Key Test:.............................................................................................................................................6-35
LED Test:............................................................................................................................................6-36
Joystick Test: ......................................................................................................................................6-38
Fader/Motor Test: ...............................................................................................................................6-39
Lexicon Test: ......................................................................................................................................6-39
Memory Test:......................................................................................................................................6-40
Repetitive Test:...................................................................................................................................6-40
Diagnostics Suite: ...............................................................................................................................6-41
OPTION BOARD Menu:.........................................................................................................................6-42
MISCELLANEOUS TESTS:................................................................................................................6-44
Program Flash Data Checking:...........................................................................................................6-46
Chapter 7 Theory of Operation ................................................................... 7-1
NLX Backplane.........................................................................................................................................7-1
Overview...............................................................................................................................................7-1
Circuit Description.................................................................................................................................7-1
NLX Interface (Sheet1) .........................................................................................................................7-2
PCI Interface (Sheets 2, 3, 4) ...............................................................................................................7-2
IO Connectors (Sheet 5).......................................................................................................................7-2
Miscellaneous Connectors (Sheet 6) ....................................................................................................7-2
IOBUS & Power Connectors (Sheet 7) .................................................................................................7-2
DSPBUS Connectors (Sheet 8, 9) ........................................................................................................7-3
I/O Backplane...........................................................................................................................................7-4
Introduction ...........................................................................................................................................7-4
Overview...............................................................................................................................................7-4
Circuit Description.................................................................................................................................7-5
I/O Clock card - Input/Output and Clock Generator card..........................................................................7-7
Midi Interface ........................................................................................................................................7-7
Ttl Wordclock Interface .........................................................................................................................7-7
Larc2 Interface......................................................................................................................................7-8
CPLD Logic...........................................................................................................................................7-8
Control Interface .................................................................................................................................7-10
Register Descriptions..........................................................................................................................7-10
Access ................................................................................................................................................7-10
Description .............................................................................................................................................7-10
Lexicon

Board ID ................................................................................................................................................ 7-10
Interface revision ................................................................................................................................... 7-10
Preview Word Clock Select ................................................................................................................... 7-10
Clock Bus Interface............................................................................................................................ 7-10
Clock Selection .................................................................................................................................. 7-11
PLL Support ....................................................................................................................................... 7-11
Phase-Locked Loop ........................................................................................................................... 7-11
PLL Detailed Description ................................................................................................................... 7-12
Power Supply..................................................................................................................................... 7-14
Analog Input card .................................................................................................................................. 7-15
Overview. ........................................................................................................................................... 7-15
Input Buffer ........................................................................................................................................ 7-15
Common Mode Performance ............................................................................................................. 7-15
A/D Converter .................................................................................................................................... 7-16
Signal Polarity .................................................................................................................................... 7-16
System Interface Logic ...................................................................................................................... 7-16
Control Interface ................................................................................................................................ 7-16
Register Descriptions......................................................................................................................... 7-16
Clock Interface ................................................................................................................................... 7-17
Digital Audio Interface........................................................................................................................ 7-17
Pin Descriptions ................................................................................................................................. 7-18
Power Supply..................................................................................................................................... 7-20
Analog Output card................................................................................................................................ 7-21
Overview ............................................................................................................................................ 7-21
Circuit Description.............................................................................................................................. 7-21
D/A Converter .................................................................................................................................... 7-21
Filter ................................................................................................................................................... 7-22
Output Driver...................................................................................................................................... 7-22
Mute Relay......................................................................................................................................... 7-22
Signal Polarity .................................................................................................................................... 7-23
System Interface Logic ...................................................................................................................... 7-23
Control Interface ................................................................................................................................ 7-23
Register Descriptions......................................................................................................................... 7-23
Clock Interface ................................................................................................................................... 7-23
Digital Audio Interface........................................................................................................................ 7-24
Power Supply..................................................................................................................................... 7-26
AES card ............................................................................................................................................... 7-28
Introduction ........................................................................................................................................ 7-28
Overview ............................................................................................................................................ 7-28
Circuit Description.............................................................................................................................. 7-29
Startup Sequence .............................................................................................................................. 7-29
AES card Memory Map...................................................................................................................... 7-29
FPGA Control Register ...................................................................................................................... 7-30
FPGA Lock Register .......................................................................................................................... 7-30
Locking to the AES Input Word Clock ................................................................................................ 7-31
Octal Select Register ......................................................................................................................... 7-31
Local Loopback Mode:....................................................................................................................... 7-32
Reverb card ........................................................................................................................................... 7-32
Introduction ........................................................................................................................................ 7-32
Overview ............................................................................................................................................ 7-32
Circuit Description.............................................................................................................................. 7-33
Startup Sequence .............................................................................................................................. 7-36
DSP 56301 Expansion Port Memory Map ......................................................................................... 7-37
Larc2...................................................................................................................................................... 7-39
General Description ........................................................................................................................... 7-39
Central Processor (sheet 1) ............................................................................................................... 7-40
960L Multi-Channel Digital Effects System Service Manual

Main Memory (sheet 2).......................................................................................................................7-41
Peripheral I/O Subsystems .................................................................................................................7-44
Power Supply......................................................................................................................................7-49
Register Summary ..............................................................................................................................7-50
Meter Bridge Module ..........................................................................................................................7-53
Chapter 8 - Parts List.................................................................................. 8-1
CHASSIS/MECHANICAL .........................................................................................................................8-1
I/O BPL ASSY,960L .................................................................................................................................8-2
I/O CLK BD ASSY,960L ...........................................................................................................................8-3
AIN BD ASSY,960L..................................................................................................................................8-4
AOUT BD ASSY,960L..............................................................................................................................8-5
AES BD ASSY,960L.................................................................................................................................8-7
RVB BD ASSY,960L ................................................................................................................................8-8
NLX CPU BD ASSY .................................................................................................................................8-9
NLX BPL EXT BD ASSY,960L .................................................................................................................8-9
I/O BPL EXT BD ASSY,960L ...................................................................................................................8-9
LARC2:...................................................................................................................................................8-10
CHASSIS/MECHANICAL: ..................................................................................................................8-10
SHIP MAT'L/PACKAGING/MISCELLANEOUS ..................................................................................8-14
POWER CORDS....................................................................................................................................8-14
SHIP MAT'L/PACKAGING/MISCELLANEOUS......................................................................................8-14
Spare Assemblies ..................................................................................................................................8-15
Chapter 9 Schematics and Drawings ......................................................... 9-1
Schematics:..............................................................................................................................................9-1
Drawings: .................................................................................................................................................9-1
Lexicon

Chapter 1 Refe r ence Documents, Required Equipment

Reference Documents
960L Owner's Manual - Lexicon P/N 070-14353 or latest revision
Software Release Notice, 960L - Lexicon P/N 070-14354 or latest revision

Required Equipment

Tools
The following is a minimum suggested technician's tool kit required for performing disassembly, assembly
and repairs: