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Lexicon 960L Service Manual
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Lexicon
7-27
Bias voltage VB is derived from both +/-12VSUP by switching transistors Q1,Q2 and associated diodes and
capacitors. An ac coupled two-phase clock at wordclock rate drives the transistors with non-overlapping on-
times creating a 24V squarewave to augment the +12V, which in a perfect pump would make VB=36V,
neglecting losses. In practice, VB is somewhat over 30V at its normal load of approximately 40mA
(16*2.4mA).
104
106
Table of Contents
default chapter
5
Table of Contents
5
Chapter 1 Reference Documents, Required Equipment
9
Reference Documents
9
Required Equipment
9
Tools
9
Test Equipment
9
Chapter 2 General Information
11
Periodic Maintenance
11
Ordering Parts
11
Returning Units to Lexicon for Service
11
Chapter 3 Specifications
13
960L Mainframe
13
LARC2 User Interface
15
Chapter 4 Performance Verification
17
Initial Inspection and Checkout
17
960L Mainframe
17
LARC2 Controller
17
Cables
17
Power Supplies
17
Audio/Functional Tests Setup
21
I/O Gain Tests
22
Analog in to Analog out Audio Gain Test
22
Analog in to Digital out Audio Gain Test
22
Digital Input to Analog Output Gain Test
22
Frequency Response
22
Analog in to Analog out Frequency Response Test
22
Analog in to Digital out Frequency Response Test
22
Digital in to Analog out Frequency Response Test
23
THD+N Measurement
23
Analog in to Analog out THD+N Test
23
Analog in to Digital out THD+N Test
23
Digital in to Analog out THD+N Test
23
Crosstalk Tests
24
Analog in to Digital out Crosstalk Test
24
Digital in to Analog out Crosstalk Test
24
Dynamic Range Tests
24
Analog in to Analog out Dynamic Range Test
24
Analog in to Digital out Dynamic Range Test
24
Digital in to Analog out Dynamic Range Test
24
Functional Tests
25
MIDI Tests
25
Listening Test
25
Lexicon Audio Precision ATE Summary
27
Chapter 5 Service Notes
29
Motherboard - Lithium Battery
29
Power Supplies
29
Symptoms of Possible Power Supply Failures
29
Larc2 Meter Display LED Handling
29
Removal and Replacement of Larc2 Piezo Transducer
29
For Units with the Transducer Soldered (Rev 5 PCB and Up)
29
For Units with the Transducer Epoxied (Rev 4 PCB and Below)
29
Female RS-422 Wraparound Plug
31
Male RS-422 Wraparound Plug
32
Chapter 6 Troubleshooting
33
Diagnostics
33
Overview
33
960L Diagnostic User Interface
34
Audio I/O Algorithm (8 in - 8 Out)
35
Functional Diagnostic Test Scripts
35
960L Setup for Functional Diagnostic Tests
36
960L Power on Diagnostic Descriptions
36
960L Functional Diagnostic Descriptions
37
960L Troubleshooting Tools
48
Global Commands
49
LISTING of RESIDENT SCRIPTS
50
Larc2 Diagnostics
56
Debug Port
57
Power on Diagnostics
58
Power on Diagnostics Sequence
58
Power on Self Tests
60
Interactive Diagnostics
65
Self Test
66
LCD Test
67
Key Test
67
LED Test
68
Joystick Test
70
Fader/Motor Test
71
Lexicon Test
71
Memory Test
72
Repetitive Test
72
Diagnostics Suite
73
OPTION BOARD Menu
74
Miscellaneous Tests
76
Program Flash Data Checking
78
Chapter 7 Theory of Operation
79
NLX Backplane
79
Overview
79
Circuit Description
79
NLX Interface (Sheet1)
80
PCI Interface (Sheets 2, 3, 4)
80
IO Connectors (Sheet 5)
80
Miscellaneous Connectors (Sheet 6)
80
IOBUS & Power Connectors (Sheet 7)
80
DSPBUS Connectors (Sheet 8, 9)
81
I/O Backplane
82
Introduction
82
Overview
82
Circuit Description
83
I/O Clock Card - Input/Output and Clock Generator Card
85
MIDI Interface
85
Ttl Wordclock Interface
85
Larc2 Interface
86
CPLD Logic
86
Control Interface
88
Register Descriptions
88
Description
88
Board ID
88
Interface Revision
88
Preview Word Clock Select
88
Clock Bus Interface
88
Clock Selection
89
PLL Support
89
Phase-Locked Loop
89
PLL Detailed Description
90
Power Supply
92
Analog Input Card
93
Overview
93
Input Buffer
93
Common Mode Performance
93
A/D Converter
94
Signal Polarity
94
System Interface Logic
94
Control Interface
94
Register Descriptions
94
Clock Interface
95
Digital Audio Interface
95
Pin Descriptions
96
Power Supply
98
Analog Output Card
99
Overview
99
Circuit Description
99
D/A Converter
99
Filter
100
Output Driver
100
Mute Relay
100
Signal Polarity
101
System Interface Logic
101
Control Interface
101
Register Descriptions
101
Clock Interface
101
Digital Audio Interface
102
Power Supply
104
AES Card
106
Introduction
106
Overview
106
Circuit Description
107
Startup Sequence
107
AES Card Memory Map
107
FPGA Control Register
108
FPGA Lock Register
108
Locking to the AES Input Word Clock
109
Octal Select Register
109
Local Loopback Mode
110
Reverb Card
110
Introduction
110
Overview
110
Circuit Description
111
Startup Sequence
114
DSP 56301 Expansion Port Memory Map
115
Larc2
117
General Description
117
Central Processor (Sheet 1)
118
Main Memory (Sheet 2)
119
Peripheral I/O Subsystems
122
Power Supply
127
Register Summary
128
Meter Bridge Module
131
Chapter 8 - Parts List
133
Chassis/Mechanical
133
I/O Bpl Assy,960L
134
I/O Clk Bd Assy,960L
135
Ain Bd Assy,960L
136
Aout Bd Assy,960L
137
Aes Bd Assy,960L
139
Rvb Bd Assy,960L
140
Nlx Cpu Bd Assy
141
Nlx Bpl Ext Bd Assy,960L
141
I/O Bpl Ext Bd Assy,960L
141
Larc2
142
Chassis/Mechanical
142
Ship Mat'l/Packaging/Miscellaneous
146
Power Cords
146
Spare Assemblies
147
Schematics
149
Other manuals for Lexicon 960L
Owner's Manual
101 pages
Owner's Manual Addendum
36 pages
Brochure
2 pages
4
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Lexicon 960L Specifications
General
Brand
Lexicon
Model
960L
Category
Recording Equipment
Language
English
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