Lexicon CORE2 User manual
Lexicon Studio Core2
Desktop
Audio System Service
Manual
Lexicon Studio Core2 Service Manual
Copyright © 1999 Lexicon, Inc.
All Rights Reserved
Lexicon Inc. ●3 Oak Park ●Bedford, MA 01730-1441 ●Tel (781) 280-0300 ●Customer Service Fax (781) 280-0499
Lexicon Part # 070-14394 Rev 0
Printed in the United States of America
Lexicon
Lexicon Studio Core2 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
Chapter 4 Performance Verification ...........................................................4-1
Test Overview: .......................................................................................................................................... 4-1
User Interface:........................................................................................................................................... 4-1
Punch page:........................................................................................................................................... 4-1
Clock Source Page:............................................................................................................................... 4-2
Core2 Page:........................................................................................................................................... 4-3
I/O Tests:................................................................................................................................................... 4-4
Analog In To Analog Out Audio Listening Test: .................................................................................... 4-4
Analog In To Digital Out Audio Listening Test:...................................................................................... 4-4
Digital In To Digital Out Audio Listening Test:....................................................................................... 4-5
Digital Input To Analog Output Listening Test:...................................................................................... 4-5
Gain Tests:................................................................................................................................................ 4-6
Analog In To Digital Out Gain Test:....................................................................................................... 4-6
Digital In To Analog Out Gain Test:....................................................................................................... 4-6
Frequency Response: ............................................................................................................................... 4-7
Analog In To Digital Out Frequency Test: ............................................................................................. 4-7
Digital In To Analog Out Frequency Test: ............................................................................................. 4-7
THD+N Measurement: .............................................................................................................................. 4-8
Analog In To Digital Out THD+N Test: .................................................................................................. 4-8
Digital In To Analog Out THD+N Test: .................................................................................................. 4-9
Crosstalk Tests: ........................................................................................................................................ 4-9
Analog In To Digital Out Crosstalk Test: ............................................................................................... 4-9
Digital In To Analog Out Crosstalk Test: ............................................................................................. 4-10
Dynamic Range Tests:............................................................................................................................ 4-10
Analog In To Digital Out Dynamic Range Test:................................................................................... 4-10
Digital In To Analog Out Signal to Noise Test:.................................................................................... 4-11
DBX THD+N Tests: ................................................................................................................................. 4-12
Analog In To Digital Out DBX THD+N Test:........................................................................................4-12
DBX Characteristics ............................................................................................................................ 4-12
Lexicon Audio Precision ATE Summary.............................................................................................. 4-13
............................................................................................................................................................. 4-13
Chapter 5 Troubleshooting ........................................................................5-1
Installation ................................................................................................................................................. 5-1
Lexicon Studio Installation Troubleshooting.......................................................................................... 5-1
Lexicon Studio Core2: Complete Uninstall and re-installation directions.............................................. 5-1
Lexicon Studio Core2: sharing IRQ or no resources assigned. Change BIOS ........................................ 5-3
V1.20 Release Notes ................................................................................................................................ 5-3
Addendum #1: NEW USER INTERFACE FEATURES......................................................................... 5-4
Addendum #2: AUXILIARY SENDS AND RETURNS........................................................................... 5-5
Addendum #3: TEXT ENTRY OF FADER VALUES ............................................................................. 5-5
Addendum #4: LEVEL ON EXTERNAL OUTPUT WHEN CLOSING LEXPANEL ............................... 5-5
Addendum #5: ROUTING IN CUBASE ................................................................................................. 5-5
Lexicon Studio Core2 Service Manual
Addendum #6: PUNCH ROUTING IN CUBASE ................................................................................... 5-5
Addendum #7: CLOCK SOURCE CONSISTENCY IN CUBASE ......................................................... 5-6
Addendum #8: THE EFFECT OF ROUTING CHANGES ON WAVE DRIVERS .................................. 5-6
Addendum #9: SELECTION OF WINDOWS SOUNDS........................................................................ 5-7
Addendum #10: CLOCK SOURCE SELECTION IN MMIO .................................................................. 5-7
Addendum #11: MMIO BUS ALIGNMENT IN ACID AND COOL EDIT PRO ....................................... 5-7
Addendum #12: NOISES THAT OCCUR AFTER SHUTDOWN OF SAMPLITUDE ............................ 5-7
Addendum #13: S/PDIF EFFECTS LOOP............................................................................................ 5-7
CORE2 USER'S GUIDE ERRATA ........................................................................................................ 5-8
V1.20-P1 Update....................................................................................................................................... 5-8
Lexicon Studio Core2: Update patch v120-P1 won't unzip properly......................................................... 5-9
C2V120P2.reg - Update............................................................................................................................ 5-9
Lexicon Studio Core2: In Cubase®, the LexPanel does not get properly shut down from the task bar... 5-9
Chapter 6 Theory of Operation .................................................................. 6-1
Architectural Overview .............................................................................................................................. 6-1
Core2 Block Diagram ................................................................................................................................ 6-2
Startup Sequence ..................................................................................................................................... 6-3
DSP56301 (schematic sheet 1.) ............................................................................................................... 6-3
DSP 56301 Expansion Port Memory Map (AA1, AA2 chip selects) ......................................................... 6-3
DSP 56301 Expansion Port Memory Map (AA0 chip select, 48K/44.1K mode)....................................... 6-4
DSP 56301 Expansion Port Memory Map (AA0 chip select, 96K/88.2K mode 1).................................... 6-4
DSP 56301 Expansion Port Memory Map (AA0 chip select, 96K/88.2K mode 2).................................... 6-4
DSP 56301 Expansion Port Memory Map (AA0 chip select, 96K/88.2K mode 3).................................... 6-5
DSP 56301 ESSI Ports ............................................................................................................................. 6-5
DSP 56301 ESSI Port C Register............................................................................................................. 6-5
DSP 56301 ESSI Port D Register............................................................................................................. 6-5
XCS10 FPGA (schematic sheet 2.) .......................................................................................................... 6-5
System Control Register 0 ........................................................................................................................ 6-6
System Control Register 1 ........................................................................................................................ 6-6
Word clock source encoding..................................................................................................................... 6-6
System Status Register............................................................................................................................. 6-7
SPDIF TX Channel Status byte 3 ............................................................................................................. 6-7
SPDIF sample rate encoding .................................................................................................................... 6-7
Sample Clock Phase-Locked Loop (schematic sheet 3.) ......................................................................... 6-7
PCI & Option Connectors (schematic sheet 4.) ........................................................................................ 6-7
Audio I/O & Connectors (schematic sheet 5.)........................................................................................... 6-8
A/D Conversion (schematic sheet 6.) ....................................................................................................... 6-8
D/A Conversion (schematic sheets 8, 9 ).................................................................................................. 6-8
Voltage Regulators (schematic sheet 10.) ................................................................................................ 6-8
Chapter 7 - Parts List................................................................................. 7-1
CORE 2 PC BOARD ASSEMBLY ............................................................................................................ 7-1
CORE2 CONNECTOR BD MECHANICAL ASSEMBLY .......................................................................... 7-3
CORE 2 CONNECTOR BD PC BOARD ASSEMBLY .............................................................................. 7-3
CORE 2 SHIPPING MATERIAL ............................................................................................................... 7-3
Chapter 8 Schematics and Drawings.........................................................8-1
Schematics:............................................................................................................................................... 8-1
Drawings: .................................................................................................................................................. 8-1
Lexicon
1-1
Chapter 1 Reference Documents, Required Equipment
Reference Documents
Lexicon Studio Core2 Owner's Manual - Lexicon P/N 070-13748 or latest revision
Lexicon Studio Core2 Installation Instructions - Lexicon P/N 070-14195 or latest revision
Lexicon Studio Core2 CD - Lexicon P/N 750-13716 or latest revision
Required Equipment
Tools
The following is a minimum suggested technician's tool kit required for performing disassembly, assembly
and repairs:
•Clean, antistatic, well lit work area.
•(1) #1 Phillips tips screwdriver
•(1) 14mm socket nut driver
•PCI Passive Extender, AZ-COM 9900-27-01 (Rev. B) or equivalent.
•PCI Passive Mini Extender, AZ-COM 9900-07-05 (Rev. B) or equivalent.
•Solder: 63/37 - Tin/Lead Alloy composition, low residue, no-clean solder.
•Magnification glasses and lamps
•SMT Soldering / Desoldering bench-top repair station
Test Equipment
The following is a minimum suggested equipment list required to perform the proof of performance tests.
-A personal PC (PC) with an Intel Pentium CPU of at least 200Mhz. 64meg memory,
Windows95®.
-A monitor, keyboard and mouse.
-Lexicon Studio Core2 system consisting of a Core2 PCI card, Connector Box and the
proprietary Lexicon cable to connect the Core2 and Connector Box (provided with the system).
-Amplifier with speakers or headphones.
-At least the following to perform the minimum I/O tests as signal source:
-(1) CD player with both analog and digital (S/PDIF) inputs and outputs. Or,
-(1) DAT machine with both analog and digital (S/PDIF) inputs and outputs. Or,
-(1) Effects box with tone generator (e.g. preset 170 on MPX-1).
-(1) Lexicon M300 (or other device for equivalent A/D and D/A conversion)
-Cables: (dependent on your signal source)
-(2) ¼ unbalanced single conductor to (whatever type connector your amp has) for analog
connections.
-(2) RCA to RCA for digital in to digital out. For digital audio use 75Ωcable.
-(2) Optical to Optical for digital in to digital out.
-(1) low distortion analog oscillator
-(1) analog distortion analyzer and level meter with 20kHz or 30kHz Lo Pass Filter
-(1) 100 MHz oscilloscope
-(1) digital distortion analyzer & digital function generator (e.g. Stanford Research Systems
Model DS360 or Audio Precision System 1 with DSP Option /System 2).
Lexicon
2-1
Chapter 2 General Information
Periodic Maintenance
Under normal conditions the Lexicon Studio Core2 system requires minimal maintenance. Use a soft, lint-
free cloth slightly dampened with warm water and a mild detergent to clean the exterior surfaces of the
connector box.
Do not use alcohol, benzene or acetone-based cleaners or any strong commercial cleaners. Avoid
using abrasive materials such as steel wool or metal polish. It the unit is exposed to a dusty environment, a
vacuum or low-pressure blower may be used to remove dust from the unit's exterior.
Ordering Parts
When ordering parts, identify each part by type, price and Lexicon Part Number. Replacement parts can be
ordered from:
LEXICON, INC.
3 Oak Park
Bedford, MA 01730-1441
Telephone: 781-280-0300; Fax: 781-280-0499; email: csupport@lexicon.com
ATTN: Customer Service
Returning Units to Lexicon for Service
Before returning a unit for warranty or non-warranty service, consult with Lexicon Customer
Service to determine the extent of the problem and to obtain Return Authorization. No equipment
will be accepted without Return Authorization from Lexicon.
If Lexicon recommends that a Lexicon Studio Core2 be returned for repair and you choose to return the unit
to Lexicon for service, Lexicon assumes no responsibility for the unit in shipment from the customer to the
factory, whether the unit is in or out of warranty. All shipments must be well packed (using the original
packing materials if possible), properly insured and consigned, prepaid, to a reliable shipping agent.
When returning a unit for service, please include the following information:
•Name
•Company Name
•Street Address
•City, State, Zip Code, Country
•Telephone number (including area code and country code where applicable)
•Serial Number of the unit
•Description of the problem
•Preferred method of return shipment
•Return Authorization #, on both the inside and outside of the package
Please enclose a brief note describing any conversations with Lexicon personnel (indicate the name of the
person at Lexicon) and give the name and telephone daytime number of the person directly responsible for
maintaining the unit.
Return the Core2 board, connector box and cable. Do no include accessories such as manuals, audio
cables, footswitches, etc. with the unit, unless specifically requested to do so by Lexicon Customer Service
personnel.
Lexicon
3-1
Chapter 3 Specifications
Analog Inputs
Connectors Unbalanced TS 1/4” Phone Jack
Impedance > 25kΩ
A/D Dynamic Range
105dB typical, 20kHz bandwidth
107dB typical, A weighted
Levels -18dBV to +14dBV full scale, adjustable
Sample Rates 44.1kHz, 48kHz
Frequency Response 20Hz to 20kHz ±0.5dB, ref 1 kHz
Crosstalk < -96dB @ 1kHz
THD < 0.005%, 20Hz to 20kHz
Resolution 24 Bits Delta-Sigma Conversion
Analog Outputs
Connectors Unbalanced TS 1/4” Phone Jack
Impedance 150Ωnominal
D/A Dynamic Range
100dB typical, 20kHz bandwidth
102 dB typical, A weighted
Levels + 8dBV, full scale
Frequency Response 20Hz to 20kHz ±1dB, ref 1 kHz
Crosstalk < -96 dB @ 1 kHz
THD < 0.005%, 20 Hz to 20 kHz
Resolution 24 Bits Delta-Sigma Conversion
Digital Audio Interface
Input Connectors
Coaxial RCA (24-bit S/PDIF or TTL Word Clock)
Optical (24 bit S/PDIF or 24 bit ADAT)
Output Connectors
Coaxial RCA (24 bit S/PDIF)
Optical (24 bit S/PDIF or 24 bit ADAT)
Sample Rates 44.1 kHz, 48 kHz
Word Clock Sources ADAT, S/PDIF, external TTL Word Clock, or Internal
System Specifications
Computer Interface 33 MHz/32-bit PCI Master/Slave Interface
Internal Interface Option board connector
Power Requirements +5v ±5%
Clock Range 44.1 kHz ±2%, 48 kHz ±2%
FCC Rating Class B
Operating Temperature 30°-100°F (0°-40°C)
Bundled Software
Lexicon Drivers and Control Panel, Syntrillium Cool Edit Pro
Specifications subject to change without notice.
Lexicon
4-1
Chapter 4 Performance Ver ification
This section describes a quick verification of the operation of the Lexicon Core2 system and the integrity of
its analog and digital audio signal paths. These tests should be performed without any programs running on
the PC. Preferably, the tests should be run after a fresh start-up.
Test Overview:
These tests verify the analog and digital audio paths through the Core2 Connector Box and the Core2 Main
board installed in the computer. The audio testing is preformed using the LexPanel.EXE program. The
LexPanel provides multiple paths of audio routing so that in the event of a failure, the defective circuit can
be located and repaired.
User Interface:
The LexPanel consists of three pages that are used for selecting the Audio Inputs, Audio Outputs, Sample
Rate, Clock Source, etc. Double clicking on the LexPanel Icon in the lower right hand section of the task bar
can access these pages. Each tab of the LexPanel can be accessed by using the mouse or via the function
keys F5, F6 & F7.
F5 is for the Punch page
F6 is for the Clock Source page
F7 is for the Core2 page
Punch page:
The Punch page is used for selecting the Audio Inputs and Audio Outputs to be tested. The example below
shows the Analog Input 1 (A/D 1) being routed to the Left S/PDIF Digital Output (S/PDIF Out L).
NOTE: The “Enable Punch” checkbox must be selected, and the “Monitor” button (lower right) must also
be enabled prior to the selection of the audio A/D input Sources and D/A output destinations.
Lexicon Studio Core2 Service Manual
4-2
IMPORTANT: The LexPanel MUST be the focused (active) application in order for any
audio to pass through the Core2 hardware.
Clock Source Page:
The Clock Source page is used for selecting the internal Sample Rate and audio Clock Source.
The example below shows 44100Hz selected as the Sample Rate and Internal selected as the Clock
Source.
Lexicon
4-3
Core2 Page:
The Core2 page is used for configuring audio routing.
The example below shows the Analog Inputs, Outputs 1-4 & Outputs 5-8 and S/PDIF In & S/PDIF Out are
enabled.
The “Core2” page (above) is also used for changing the settings of the Analog Input Level faders.
There are four LED’s labeled dbx 1-4 (located at the lower right of the LexPanel) that are used to monitor
the status of the jumpers W1-W8 on the Core2 Main board. All of the following tests are specified with the
dbx circuits enabled and the jumpers installed at W5-8.
OFF (Dark Green) = dbx Disabled
ON (Bright Green) = dbx Enabled
Lexicon Studio Core2 Service Manual
4-4
I/O Tests:
Analog In To Analog Out Audio Listening Test:
1. Connect the audio source (CD player, DAT, or effects box) Analog Output to the Analog Input marked
#1 on the Core2 Connector Box.
2. Connect the analog output marked #1 of the Core2 Connector Box to your amplifier with speaker or
headphone output. Be sure to turn the volume down on the amplifier.
3. Open the LexPanel by double clicking on the Lexicon Studio Icon.
4. Click on the Core2 tab to bring it forward. In the Routing area, activate the Analog Inputs, Analog
Outputs 1-4, and Analog Outputs 5-8 buttons by clicking on each of them.
5. To activate your Routing selections, click on the Apply button, if it is flashing. There is no need to click
the Apply button if it is not flashing.
6. Click on the Clock Source tab to bring it forward. In the Clock Source menu, select Internal and set the
Sample Rate to 44100.
7. Click on the Punch tab to bring it forward. To enable your Input Source and Output Destinations
selected from the Core2 tab, make sure the enable punch check-box is selected (it will have a check in
the box if enabled).
8. Hold the CTRL key down on the computer keypad, then in the Sources menu select all A/D inputs, 1-4.
9. Hold the CTRL key down and select all the D/A outputs, 1-8, in the Destinations menu.
10. Turn the volume up on the amplifier and make sure the audio is free from any audio defects (pops,
clicks, static etc).
11. To test the remaining outputs, move the output cable from the #1 analog output to each of the
remaining outputs 2-8 and test the audio as described above for audio defects.
12. To test the remaining inputs, move the input cable from the #1 analog input to each of the remaining
inputs 2-4 and test the audio as described above in step 10.
Analog In To Digital Out Audio Listening Test:
1. Connect the audio source (CD player, DAT, or effects box) Analog Output to the Analog Input marked
#1 on the Core2 Connector Box.
2. The digital output marked S/PDIF of the Core2 Connector Box needs to be connected to a device for
D/A conversion back to an analog signal. Configure the device for Coax S/PDIF.
3. Connect the analog output of the D/A to your amplifier with speaker or headphone output. Be sure to
turn the volume down on the amplifier.
4. Open the LexPanel by double clicking on the Lexicon Studio Icon.
5. Click on the Core2 tab to bring it forward. In the Routing area, activate the Analog Input and S/PDIF Out
buttons by clicking on them. If the Optical S/PDIF box is enabled (checked), disable it.
6. To activate your Routing selections, click on the Apply button, if it is flashing. There is no need to click
the Apply button if it is not flashing.
7. Click on the Clock Source tab to bring it forward. In the Clock Source menu, select Internal and set the
Sample Rate to 44100.
13. Click on the Punch tab to bring it forward. To enable your Input Source and Output Destinations
selected from the Core2 tab, make sure the enable punch check-box is selected (it will have a check in
the box if enabled).
8. Hold the CTRL key down on the computer keypad, then in the Sources menu, select all A/D inputs 1-4.
9. Hold the CTRL key down and select S/PDIF Out L and S/PDIF Out R in the Destinations menu.
10. Turn the volume up on the amplifier and make sure the audio is free from any audio defects (pops,
clicks, static etc).
11. To test the remaining Inputs, move the input cable from the #1 analog input to each of the remaining
inputs 2-4 and test the audio as described above.
12. The above test needs to be repeated for the S/PDIF Optical output connection of the Core2.
13. Disconnect the Coax S/PDIF Output.
14. Using optical cable connect the Optical Out on the back of the Core2 card to the D/A for conversion
back to an analog signal as stated in Step 2 above.
15. In the Routing area activate the Optical S/PDIF Out by checking the Optical box.
Lexicon
4-5
16. Repeat steps 10 and 11 to test audio quality.
Digital In To Digital Out Audio Listening Test:
1. Connect the audio source (CD player, DAT, or effects box) Digital Output to the Digital Input marked
S/PDIF IN on the Core2 Connector Box.
2. The digital output marked S/PDIF of the Core2 Connector Box needs to be connected to a device for
D/A conversion back to an analog signal. Configure the device for Coax S/PDIF.
3. Connect the analog output of the D/A to your amplifier with speaker or headphone output. Be sure to
turn the volume down on the amplifier.
4. Open the LexPanel by double clicking on the Lexicon Studio Icon.
5. Click on the Core2 tab to bring it forward. In the Routing area, activate the S/PDIF In and S/PDIF Out
buttons by clicking on each of them. If the Optical S/PDIF box is enabled (checked), disable it.
6. To activate your routing selections, click on the Apply button, if it is flashing. There is no need to click
the Apply button if it is not flashing.
7. Click on the Clock Source tab to bring it forward. In the Clock Source menu, select S/PDIF.
8. Click on the Punch tab to bring it forward. To enable your Input Source and Output Destinations
selected from the Core2 tab, make sure the enable punch check-box is selected (it will have a check in
the box if enabled).
9. Hold the CTRL key down on the computer keypad, then in the Sources menu, select S/PDIF In L and
S/PDIF In R.
10. Hold the CTRL key down and select S/PDIF Out L and S/PDIF Out R in the Destinations menu.
11. Turn the volume up on the amplifier and make sure the audio is free from any audio defects (pops,
clicks, static etc).
12. The above test needs to be repeated for the S/PDIF Optical connections of the Core2.
13. Disconnect the Coax S/PDIF input and output cables. Connect the Optical output cable from the Digital
audio source to the Core2 Optical Input.
14. Using optical cables connect the Optical Out on the back of the Core2 card to the D/A for conversion
back to an analog signal as stated in Step 2 above. Configure the device for Optical S/PDIF.
15. In the Routing area, activate the Optical S/PDIF In and S/PDIF Out by checking the Optical box.
16. Repeat step 11 to test audio quality
Digital Input To Analog Output Listening Test:
1. Connect the audio source (CD player, DAT, or effects box) Digital Output to the Digital Input marked
S/PDIF IN on the of the Core2 Connector Box.
2. Connect the analog output marked #1 on the Core2 Connector Box to your amplifier with speaker or
headphone output. Be sure to turn the volume down on the amplifier.
3. Open the LexPanel by double clicking on the Lexicon Studio Icon.
4. Click on the Core2 tab to bring it forward. In the Routing area, activate the S/PDIF In, Analog Outputs 1-
4 and Outputs 5-8 buttons by clicking on each of them. If Optical is enabled (checked), disable it.
5. To activate your routing selections, click on the Apply button, if it is flashing. There is no need to click
the Apply button if it is not flashing..
6. Click on the Clock Source tab to bring it forward. In the Clock Source menu, select S/PDIF.
7. Click on the Punch tab to bring it forward. To enable your Input Source and Output Destinations
selected from the Core2 tab, make sure the enable punch check-box is selected (it will have a check in
the box if enabled).
8. Hold the CTRL key down on the computer keypad, then in the Sources menu select S/PDIF In L and
S/PDIF In R.
9. Hold the CTRL key down and select all the D/A outputs 1-8 in the Destinations menu.
10. Turn the volume up on the amplifier and make sure the audio is free from any audio defects (pops,
clicks, static etc).
11. To test the remaining Outputs, move the output cable from #1 analog output to each of the remaining
outputs 2-8 and test the audio, as described above, for audio defects.
12. The above test needs to be repeated for the S/PDIF Optical input connection of the Core2.
13. Disconnect the Coax S/PDIF input source.
Lexicon Studio Core2 Service Manual
4-6
14. Using optical cable connect the Optical Output from the digital audio source to the Optical Input on the
back of the Core2 card as described in Step 1 above.
15. In the Routing area, activate the Optical S/PDIF In by checking the Optical box.
16. Repeat steps 10 and 11 to test audio quality.
Gain Tests:
Analog In To Digital Out Gain Test:
The A-D Gain tests verify that audio is passed from the analog input under test to the digital output.
1. Apply a 1kHz signal @ +8dBv from the Analog Low Distortion Oscillator to the Analog Input marked #1
on the Core2 Connector Box.
2. Connect the digital output marked S/PDIF of the Core2 Connector Box to the Digital Distortion Analyzer
3. Open the LexPanel by double clicking on the Lexicon Studio Icon.
4. Click on the Core2 tab to bring it forward. In the Routing area, activate the Analog Inputs and S/PDIF
Out buttons by clicking on it. If Optical is enabled (checked), disable it.
5. To activate your Routing selections, click on the Apply button, if it is flashing. There is no need to click
the Apply button if it is not flashing.
6. Click on the Clock Source tab to bring it forward. In the Clock Source menu, select Internal and set the
Sample Rate to 44100.
7. Click on the Punch tab to bring it forward. To enable your Input Source and Output Destinations
selected from the Core2 tab, make sure the enable punch check-box is selected (it will have a check in
the box if enabled)..
8. Hold the CTRL key down on the computer keypad, then in the Sources menu, select all A/D inputs 1-4.
9. Hold the CTRL key down and select S/PDIF Out L and S/PDIF Out R in the Destinations menu.
10. Verify the digital output is –1.5dBFS, (+/-.5dBFS).
11. To test the remaining Inputs, move the input cable from the #1 analog input to each of the remaining
inputs 2-4 and test for the audio spec as described above.
12. The above test needs to be repeated for the S/PDIF Optical output connection of the Core2.
13. Disconnect the Coax S/PDIF Output.
14. Using optical cable connect the Optical Output on the back of the Core2 card to the Digital Distortion
Analyzer as stated in Step 2 above.
15. In the Routing area, activate the Optical S/PDIF Out by checking the Optical box.
16. Disconnect the Coax S/PDIF input and configure the D/A device for Optical S/PDIF.
17. Move the Audio Input cable back to the analog #1.
18. Repeat steps 10 and 11 to test for Gain specification.
Digital In To Analog Out Gain Test:
The D-A Gain tests verify that audio is passed from the digital input to the analog output.
1. Apply a 1kHz signal @ 0.0dBFS signal from the Digital Function Generator to the S/PDIF IN on the
Core2 Connector Box.
2. Connect the analog output marked #1 on the Core2 Connector Box to the Analog Distortion Analyzer.
3. Open the LexPanel by double clicking on the Lexicon Studio Icon.
4. Click on the Core2 tab to bring it forward. In the Routing area, activate the S/PDIF In, Analog Outputs 1-
4, and Output 5-8 buttons by clicking on each of them. If Optical is enabled (checked), disable it.
5. To activate your Routing selections, click on the Apply button, if it is flashing. There is no need to click
the Apply button if it is not flashing.
6. Click on the Clock Source tab to bring it forward. In the Clock Source menu select S/PDIF.
7. Click on the Punch tab to bring it forward. To enable your Input Source and Output Destinations
selected from the Core2 tab, make sure the enable punch check-box is selected with a check.
8. Hold the CTRL key down on the computer keypad, then in the Sources menu S/PDIF In L and S/PDIF
In R.
9. Hold the CTRL key down and select all the D/A outputs 1-8 in the Destinations menu.
Lexicon
4-7
10. Verify the analog output is +7.6dBv (+/-1dBv).
11. To test the remaining Outputs, move the output cable from #1 analog output to each of the remaining
outputs 2-8 and test for the audio spec as described above.
12. Disconnect the S/PDIF Coax Input.
13. The above test needs to be repeated for the S/PDIF Optical input connection of the Core2.
14. Disconnect the Coax S/PDIF input.
15. Using optical cable connect the Digital Function Generator to the Optical Input on the back of the Core2
card as described in Step 1 above.
16. In the Routing area, activate the Optical S/PDIF In by checking the Optical box.
17. Repeat step 10 and 11 to test for Gain specification.
Frequency Response:
Analog In To Digital Out Frequency Test:
These tests check the frequency response of the analog input under test to digital output path.
1. Apply a 1kHz signal @ +0dBv from the Analog Low Distortion Oscillator to the Analog Input marked #1
on the Core2 Connector Box.
2. Connect the digital output marked S/PDIF on the Core2 Connector Box to the Digital Distortion
Analyzer.
3. Open the LexPanel by double clicking on the Lexicon Studio Icon.
4. Click on the Core2 tab to bring it forward. In the Routing area, activate the Analog Inputs and S/PDIF
Out buttons by clicking on them. If Optical is enabled (checked), disable it.
5. To activate your Routing selections, click on the Apply button, if it is flashing. There is no need to click
the Apply button if it is not flashing.
6. Click on the Clock Source tab to bring it forward. In the Clock Source menu, select Internal and set the
Sample Rate to 44100.
7. Click on the Punch tab to bring it forward. To enable your Input Source and Output Destinations
selected from the Core2 tab, make sure the enable punch check-box is selected (it will have a check in
the box if enabled).
8. Hold the CTRL key down on the computer keypad then in the Sources menu, select all A/D inputs 1-4.
9. Hold the CTRL key down and select S/PDIF Out L and S/PDIF Out R in the Destinations menu.
10. Take a 0dB reference reading on the analyzer.
11. Sweep the Oscillator from 20Hz to 20kHz and verify the digital output remains at +/-.5 dBFS of the
referenced reading.
12. To test the remaining Inputs, move the input cable from the #1 analog input to each of the remaining
inputs 2-4 and test for the audio spec as described above.
13. The above test needs to be repeated for the S/PDIF Optical output connection of the Core2.
14. Disconnect the Coax S/PDIF Output.
15. Using optical cable connect the Optical Output on the back of the Core2 card to the Digital Distortion
Analyzer as described in Step 2 above.
16. In the Routing area, activate the Optical S/PDIF Out by checking the Optical box.
17. Move the Audio Input cable back to the analog #1.
18. Repeat steps 10 - 12 and check the Frequency specification.
Digital In To Analog Out Frequency Test:
These tests check the frequency response of the digital input under test to analog output path.
1. Apply a 1kHz signal @ -1.0dBFS signal from the Digital Function Generator to the S/PDIF IN on the
Core2 Connector Box.
2. Connect the analog output marked #1 on the Core2 Connector Box to the Analog Distortion Analyzer.
3. Open the LexPanel by double clicking on the Lexicon Studio Icon.
Lexicon Studio Core2 Service Manual
4-8
4. Click on the Core2 tab to bring it forward. In the Routing area, activate the S/PDIF In, Analog Outputs 1-
4, and Output 5-8 buttons by clicking on each of them. If Optical is enabled (checked), disable it.
5. To activate your Routing selections, click on the Apply button, if it is flashing. There is no need to click
the Apply button if it is not flashing.
6. Click on the Clock Source tab to bring it forward. In the Clock Source menu, select S/PDIF.
7. Click on the Punch tab to bring it forward. To enable your Input Source and Output Destinations
selected from the Core2 tab, make sure the enable punch check-box is selected (it will have a check in
the box if enabled).
8. Hold the CTRL key down on the computer keypad then in the Sources menu S/PDIF In L and S/PDIF In
R.
9. Hold the CTRL key down and select all the D/A outputs 1-8 in the Destinations menu.
10. Take a 0dB reference reading on the analyzer.
11. Sweep the Oscillator from 20Hz to 20kHz and verify the analog output is +/- 1dBr.
12. To test the remaining Outputs move the output cable from the #1 analog output to each of the
remaining outputs 2-8 and test the audio as described above for audio defects.
13. The above test needs to be repeated for the S/PDIF Optical input connection of the Core2.
14. Disconnect the Coax S/PDIF input.
15. Using optical cable connect the Digital Function Generator to the Optical Input on the back of the Core2
card as described in Step 1 above.
16. In the Routing area activate the Optical S/PDIF by checking the Optical box.
17. Repeat step 10 and 12 and check for Frequency specification.
THD+N Measurement:
Analog In To Digital Out THD+N Test:
These tests check the THD+N of the analog input to digital output path.
1. Connect the Analog Low Distortion Oscillator to the Analog Input marked #1 on the Core2 Connector
Box.
2. Connect the digital output marked S/PDIF on the Core2 Connector Box to the Digital Distortion
Analyzer set to measure THD+N.
3. Open the LexPanel by double clicking on the Lexicon Studio Icon.
4. Click on the Core2 tab to bring it forward. In the Routing area activate the Analog Inputs and S/PDIF
Out buttons by clicking on them. If Optical is enabled (checked), disable it.
5. To activate your Routing selections, click on the Apply button, if it is flashing. There is no need to click
the Apply button if it is not flashing.
6. Click on the Clock Source tab to bring it forward. In the Clock Source menu select Internal and set the
Sample Rate to 44100.
7. Click on the Punch tab to bring it forward. To enable your Input Source and Output Destinations
selected from the Core2 tab, make sure the enable punch check-box is selected (it will have a check in
the box if enabled)..
8. Hold the CTRL key down on the computer keypad. In the Sources menu, select all A/D inputs 1-4.
9. Hold the CTRL key down and select S/PDIF Out L and S/PDIF Out R in the Destinations menu.
10. Apply the signal frequencies and levels as indicated in the table below and verify that the digital output
is within spec (< 0.005%). Do not take measurements while sweeping of frequencies. Set the level and
frequency and take each measurement independently.
Frequency (Hz) 20k 10k 6k 1k 100 20
Input Level (dBv) -5.00 -5.00 -5.00 -3.00 -3.00 -3.00
11. To test the remaining Inputs, move the input cable from the #1 analog input to each of the remaining
inputs 2-4 and test for the audio spec as described above.
12. The above test needs to be repeated for the S/PDIF Optical output connection of the Core2.
13. Disconnect the Coax S/PDIF Output.
Other manuals for CORE2
2
Table of contents
