Lexicon MC-12 Service manual

MC-12 / MC-12 Balanced

Music and Cinema

Processors

Service
Manual

MC-12 / MC-12 Balanced Service Manual

Precautions

Save these instructions for later use.

Follow all instructions and warnings marked on the unit.

Always use with the correct line voltage. Refer to the manufacturer's operating instructions for power requirements. Be advised that
different operating voltages may require the use of a different line cord and/or attachment plug.

Do not install the unit in an unventilated rack, or directly above heat producing equipment such as power amplifiers. Observe the
maximum ambient operating temperature listed in the product specification.

Slots and openings on the case are provided for ventilation; to ensure reliable operation and prevent it from overheating, these
openings must not be blocked or covered. Never push objects of any kind through any of the ventilation slots. Never spill a liquid of
any kind on the unit.

This product is equipped with a 3-wire grounding type plug. This is a safety feature and should not be defeated.

Never attach audio power amplifier outputs directly to any of the unit’s connectors.

To prevent shock or fire hazard, do not expose the unit to rain or moisture, or operate it where it will be exposed to water.

Do not attempt to operate the unit if it has been dropped, damaged, exposed to liquids, or if it exhibits a distinct change in performance
indicating the need for service.

This unit should only be opened by qualified service personnel. Removing covers will expose you to hazardous voltages.

This triangle, which appears on your component, alerts you to the presence of uninsulated, dangerous voltage inside the

enclosure… voltage that may be sufficient to constitute a risk of shock.

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

This triangle, which appears on your component, alerts you to important operating and maintenance Instructions in this

accompanying literature.

Notice

This equipment generates and uses radio frequency energy and if not installed and used properly, that is, in strict accordance with the
manufacturer's instructions, may cause interference to radio and television reception. It has been type tested and found to comply with
the limits for a Class B computing device in accordance with the specifications of Part 15 of FCC Rules, which are designated to
provide reasonable protection against such interference in a residential installation. However, there is no guarantee that interference
will not occur in a particular installation. If this equipment does cause interference to radio or television reception, which can be
determined by turning the equipment OFF and ON, the user is encouraged to try to correct the interference by one or more of the
following measures:

If necessary, the user should consult the dealer or an experienced radio/television technician for additional suggestions. The user may
find the following booklet prepared by the Federal Communications Commission helpful:

This booklet is available from the U.S. Government Printing Office, Washington, DC 20402, Stock No. 004-000-00345-4.

Le présent appareil numérique n'émet pas de bruits radioélectriques dépassant les limites applicables aux appareils numériques de Ia
class B prescrites dans le Règlement sur le brouillage radioélectrique édicté par le ministère des Communications du Canada.

Reorient the receiving antenna
Relocate the computer with respect to the receiver
Move the computer away from the receiver
Plug the computer into a different outlet so that the computer and receiver are on different branch circuits.

“How to identify and Resolve Radio/TV Interference Problems"

Copyright © 2002 Lexicon, Inc.
All Rights Reserved

Lexicon Inc. ● 3 Oak Park ● Bedford, MA 01730-1441 ● Tel [phone] ● Customer Service Fax [phone]
Lexicon Part # 070-14828 Rev 0
Printed in the United States of America

Safety Suggestions

Lexicon

Read Instructions Read all safety and operating
instructions before operating the unit.

Retain Instructions Keep the safety and
operating instructions for future reference.

Heed Warnings Adhere to all warnings on the
unit and in the operating instructions.

Follow Instructions Follow operating and use
instructions.

Heat Keep the unit away from heat sources such
as radiators, heat registers, stoves, etc., including
amplifiers which produce heat.

Ventilation Make sure that the location or
position of the unit does not interfere with its
proper ventilation. For example, the unit should
not be situated on a bed, sofa, rug, or similar
surface that may block the ventilation openings;
or, placed in a cabinet which impedes the flow of
air through the ventilation openings.

Wall or Ceiling Mounting Do not mount the unit
to a wall or ceiling except as recommended by
the manufacturer.

Power Sources Connect the unit only to a power
supply of the type described in the operating
instructions, or as marked on the unit.

Grounding or Polarization* Take precautions
not to defeat the grounding or polarization of the
unit’s power cord.
*Not applicable in Canada.

Power Cord Protection Route power supply
cords so that they are not likely to be walked on
or pinched by items placed on or against them,
paying particular attention to cords at plugs,
convenience receptacles, and the point at which
they exit from the unit.

Nonuse Periods Unplug the power cord of the
unit from the outlet when the unit is to be left
unused for a long period of time.

Water and Moisture Do not use the unit near
water — for example, near a sink, in a wet
basement, near a swimming pool, near an open
window, etc.

Object and Liquid Entry Do not allow objects to
fall or liquids to be spilled into the enclosure
through openings.

Cleaning The unit should be cleaned only as
recommended by the manufacturer.

Servicing Do not attempt any service beyond
that described in the operating instructions. Refer
all other service needs to qualified service
personnel.

Damage Requiring Service The unit should be
serviced by qualified service personnel when:
the power supply cord or the plug has been
damaged; objects have fallen or liquid has been
spilled into the unit; the unit has been exposed to
rain; the unit does not appear to operate normally
or exhibits a marked change in performance; the
unit has been dropped, or the enclosure
damaged.

MC-12/MC-12 Balanced Service Manual

The following general safety precautions must be observed during all phases of operation, service and repair of this instrument. Failure to

SAFETY SUMMARY

comply with these precautions or with specific warnings elsewhere in these instructions violates safety standards of design manufacture and
intended use of the instrument. Lexicon assumes no liability for the customer’s failure to comply with these requirements.

To minimize shock hazard the instrument chassis and cabinet

GROUND THE INSTRUMENT

must be connected to an electrical ground. The instrument is
equipped with a three-conductor AC power cable. The power
cable must either be plugged into an approved three-contact
electrical outlet or used with a three-contact to two-contact
adapter with the grounding wire (green) firmly connected to an
electrical ground (safety ground) at the power outlet. The power
jack and mating plug of the power cable meet International
Electrotechnical Commission (IEC) safety standards.

DO NOT OPERATE IN AN EXPLOSIVE

ATMOSPHERE

Do not operate the instrument in the presence of flammable gases
or fumes. Operation of any electrical instrument in such an
environment constitutes a definite safety hazard.

KEEP AWAY FROM LIVE CIRCUITS

Operating personnel must not remove instrument covers.
Component replacement and internal adjustments must be made
by qualified maintenance personnel. Do not replace components
with power cable connected. Under certain conditions, dangerous
voltages may exist even with the power cable removed. To avoid
injuries, always disconnect power and discharge circuits before
touching them.

DO NOT SERVICE OR ADJUST ALONE

Do not attempt internal service or adjustment unless another
person, capable of rendering first aid and resuscitation, is present.

DO NOT SUBSTITUTE PARTS OR MODIFY

INSTRUMENT

Because of the danger of introducing additional hazards, do not
install substitute parts or perform any unauthorized modification to
the instrument.

DANGEROUS PROCEDURE WARNINGS

Warnings, such as the example below, precede potentially
dangerous procedures throughout this manual. Instructions
contained in the warnings must be followed.

WARNING

Dangerous voltages, capable of causing death, are present in this
instrument. Use extreme caution when handling, testing and
adjusting.

General definitions of safety symbols used on equipment or in
manuals.

Instruction manual symbol: the product will be marked
with this symbol when it is necessary for the user to refer to the
instruction manual in order to protect against damage to the
instrument.

Indicates dangerous voltage. (Terminals fed from the
interior by voltage exceeding 1000 volts must be so marked.)

WARNING

The WARNING sign denotes a hazard. It calls attention to a
procedure, practice, condition or the like which, if not correctly
performed or adhered to, could result in injury or death to
personnel.

CAUTION

The CAUTION sign denotes a hazard. It calls attention to an
operating procedure, practice, condition or the like which, if not
correctly performed or adhered to, could result in damage to or
destruction of part or all of the product.

NOTE:

The NOTE sign denotes important information. It calls attention to
procedure, practice, condition or the like which is essential to
highlight.

Electrostatic Discharge (ESD) Precautions

The following practices minimize possible damage to ICs resulting
from electrostatic discharge or improper insertion.

SAFETY SYMBOLS

CAUTION

• Keep parts in original containers until ready for use.

• Avoid having plastic, vinyl or styrofoam in the work area.

• Wear an anti—static wrist-strap.

• Discharge personal static before handling devices.

• Remove and insert boards with care.

• When removing boards, handle only by non-conductive

surfaces and never touch open-edge connectors except at a
static-free workstation.*

• Minimize handling of ICs.

• Handle each IC by its body.

• Do not slide ICs or boards over any surface.

• Insert ICs with the proper orientation, and watch for bent

pins on ICs.

• Use static shielding containers for handling and transport.

‘To make a plastic-laminated workbench anti-static, wash with a
solution of Lux liquid detergent, and allow drying without rinsing.

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

Functional Tests ...................................................................................................................................... 4-1

Initial inspection ................................................................................................................................... 4-1

Power Supply Test............................................................................................................................... 4-1

Setup.................................................................................................................................................... 4-2

Audio Tests I/O .................................................................................................................................... 4-2

Audio Performance Verification ............................................................................................................. 4-10

Audio Inputs RCA #1 Left and Right to all Left and Right RCA/XLR Outputs Tests .......................... 4-10

All Remaining Audio RCA Inputs Left and Right to Front Left and Right RCA Output Tests ............. 4-11

Audio Inputs RCA #1 Left and Right to Zone 2 Left and Right RCA Fix /Var Outputs and Zone 2 XLR

Outputs Tests..................................................................................................................................... 4-12

Audio Inputs RCA #1 Left and Right to Record Left and Right RCA Fix /Var Outputs Tests ............. 4-13

All Digital Audio Inputs Coax, Optical, AES/EBU to the Left and Right Front RCA Outputs Tests .... 4-13

Video Input / Output Tests..................................................................................................................... 4-14

Composite Inputs to Composite (Main and Record) Outputs Tests................................................... 4-14

S-Video Inputs to S-Video (Main and Record) Outputs Tests............................................................ 4-15

Component Inputs to Component Output Tests................................................................................. 4-16

Lexicon Audio Precision ATE Summary ............................................................................................ 4-17

Chapter 5 Troubleshooting ......................................................................... 5-1

V1.00 Release Notes............................................................................................................................... 5-1

Diagnostics .............................................................................................................................................. 5-2

Introduction .......................................................................................................................................... 5-2

DiagnosticS Categories ....................................................................................................................... 5-2

Power-on Modes.................................................................................................................................. 5-3

DiagnosticS Reporting ......................................................................................................................... 5-3

Diagnostics Control/Interface............................................................................................................... 5-7

Power-on Diagnostics .......................................................................................................................... 5-7

Extended DiagnosticS Tests.............................................................................................................. 5-10

Extended Diagnostics Suite ............................................................................................................... 5-11

Service Notes ........................................................................................................................................ 5-17

Removing The Top Cover.................................................................................................................. 5-17

Removing the Video and Analog Boards ........................................................................................... 5-18

Removing the MEMORY Board ......................................................................................................... 5-19

Removing the Power Supply Board ................................................................................................... 5-19

Removing the Front Panel ................................................................................................................. 5-20

Changing Trigger Voltage From 12 Volts to 5 Volts........................................................................... 5-20

Removing the Main Board ................................................................................................................. 5-20

Initialization (Hard Reset) Procedure ................................................................................................. 5-20

Chapter 6 Theory of Operation ................................................................... 6-1

Main Board .............................................................................................................................................. 6-1

Z180 Host Processor ........................................................................................................................... 6-1

MC-12/MC-12 Balanced Service Manual

FPGAs ..................................................................................................................................................6-3

Host Interface to Other Boards .............................................................................................................6-6

Video Board & OSD..............................................................................................................................6-8

Analog Board ........................................................................................................................................6-8

OPTION Boards....................................................................................................................................6-9

DSP ....................................................................................................................................................6-10

Audio Routing .....................................................................................................................................6-14

Encoder ..............................................................................................................................................6-18

VCO Board Overview .........................................................................................................................6-20

PLL Overview .....................................................................................................................................6-21

Analog BOARD ......................................................................................................................................6-22

Overview.............................................................................................................................................6-22

Analog Audio Inputs............................................................................................................................6-23

Mic Inputs and Main A/D Converter....................................................................................................6-23

Record and Zone 2 A/D Converters....................................................................................................6-24

Record and Zone 2 D/A converters ....................................................................................................6-24

Record and Zone 2 Outputs ...............................................................................................................6-24

Main D/A Converters ..........................................................................................................................6-25

Main Outputs ......................................................................................................................................6-26

Analog FPGA......................................................................................................................................6-26

Control Registers and Main Board Connector ....................................................................................6-28

XLR Board Connector, Power Supply Connections and Regulators ..................................................6-29

xlr board Overview..............................................................................................................................6-29

Main Channels....................................................................................................................................6-29

Zone 2 Variable Channels ..................................................................................................................6-30

OPTO/MIC Input Board ......................................................................................................................6-30

Video BOARD ........................................................................................................................................6-30

Overview.............................................................................................................................................6-30

Composite video inputs ......................................................................................................................6-31

Composite video outputs ....................................................................................................................6-31

S-video inputs .....................................................................................................................................6-31

Monitor Composite / S-video ..............................................................................................................6-31

Record Composite / S-video...............................................................................................................6-32

Component Video Switcher ................................................................................................................6-32

On-Screen Display Signals.................................................................................................................6-33

Support Logic / FPGA.........................................................................................................................6-34

Sync Stripper / DC Restorer ...............................................................................................................6-34

Video Control Registers......................................................................................................................6-35

Power and Control Interface ...............................................................................................................6-35

Chapter 7 - Parts List.................................................................................. 7-1

MC-12/MC-12 Balanced MAIN BOARD ...................................................................................................7-1

MC-12/MC-12 Balanced OPTO/MIC BOARD ..........................................................................................7-3

MC-12/MC-12 Balanced VIDEO BOARD .................................................................................................7-4

MC-12/MC-12 Balanced VIDEO RCA BOARD ........................................................................................7-6

MC-12/MC-12 Balanced ANALOG I/O BOARD .......................................................................................7-6

MC-12/MC-12 Balanced SWITCH/LED BOARD ....................................................................................7-11

MC-12/MC-12 Balanced IR/ENCODER BOARD....................................................................................7-11

MC-12/MC-12 Balanced STANDBY BOARD .........................................................................................7-12

MC-12/MC-12 Balanced MEMORY BOARD ..........................................................................................7-12

MC-12/MC-12 Balanced VCO ASSEMBLY............................................................................................7-12

MC12 Balanced ONLY ...........................................................................................................................7-12

MC-12B XLR BOARD.........................................................................................................................7-12

MC-12/MC-12 Balanced CHASSIS ASSEMBLY....................................................................................7-13

MC-12/MC-12 Balanced POWER SUPPLY ASSEMBLY.......................................................................7-14

MC-12/MC-12 Balanced FAN ASSEMBLY ............................................................................................7-14

Lexicon

MC-12/MC-12 Balanced FRONT PANEL MECHANICAL ASSEMBLY ................................................. 7-14

MC-12/MC-12 Balanced VIDEO MECHANICAL ASSEMBLY ............................................................... 7-15

MC-12/MC-12 Balanced PACKAGING/MISCELLANOUS..................................................................... 7-15

MC-12/MC-12 Balanced POWER CORD OPTIONS............................................................................. 7-15

MC-12/MC-12 Balanced MOUNTING OPTION..................................................................................... 7-15

MC-12/MC-12 Balanced SPARE ASSEMBLIES ................................................................................... 7-16

Chapter 8 Schematics and Drawings ......................................................... 8-1

Schematics .............................................................................................................................................. 8-1

Drawings.................................................................................................................................................. 8-1

Lexicon

Chapter 1 Refe rence Documents, Required Equipment

Reference Documents

MC-12/MC-12 Balanced User Guide - Lexicon P/N 070-14773, 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 with grounding wrist strap

• (1) #1 Phillips tip screwdriver - (Magnetic tip preferred)

• (1) 14mm socket nut driver

• (1) Allen hex head wrench ( 2.5 mm )

• (1) 3/16 hollow nutdriver

• 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.

• (1) High quality Amplifier with RCA and XLR input connectors

• (1) Pair high quality Speakers with RCA and XLR input connectors

• (1) High quality Video Monitor with RCA, S-Video, and Component (RCA and BNC) input

connections

• (1) CD disc for test audio source

• (1) DVD movie disc for test video source

• Cables: (dependent on your signal source)

• Audio Input Cables with shield and an RCA connector on one end and an appropriate

connector on the opposite end for connection to the Low Distortion Oscillator

• Audio Output Cable with shield and an RCA connector on one end and an appropriate
connector on the opposite end for connection to the Distortion Analyzer

• Audio Output Cable (balanced) with shield and an XLR female plug on one end and an
appropriate connector on the opposite end for connection to the Distortion Analyzer

• (4) Audio Cables shielded with RCA connectors on both ends

• (2) Audio Cables shielded with an XLR male and female connector on either end

• (1) Digital Audio Cable with RCA connectors on both ends

• (1) Digital Audio Cable with Optical connectors on both ends

• (1) AES/EBU Digital cable

• (1) Digital Audio Cable with Standard Optical connector on one end and an OMJ (Optical

Mini Jack) connector on the other

• (2) Video Cables with RCA connectors on both ends

• (2) Video Cables with S-Video connectors on both ends

• (1) Video Cable with 3-wire Component RCA connectors on both ends

• (2) Video Cables with 3-wire Component BNC connectors on both ends

• (1) High end DVD player with RCA Analog Left and Right and Digital Coax and Optical

Audio Outputs

• (1) MC-12 AC power cord

• variable AC power supply 2 amp minimum

• Digital Multimeter (DMM) 3.5 digit 0.5% or better accuracy

1-1

MC-12/MC-12 Balanced Service Manual

• (1) Low Distortion Analog oscillator with single-ended or balanced output, < 100 ohms output
impedance, < .005% THD

• (1) Analog Distortion Analyzer and Level Meter with single-ended or balanced input, switchable
30Hz high pass filter or audio bandpass (20-20kHz) 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).

1-2

Lexicon

Chapter 2 Gene ral Information

Periodic Maintenance

Under normal conditions the MC-12/MC-12 Balanced requires minimal maintenance. Use a soft, lint-free
cloth slightly dampened with warm water and 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. DO
NOT use abrasive materials such as steel wool or metal polish. If 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: [phone]; Fax: [phone]; email: [e-mail]
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 an MC-12/MC-12 Balanced should 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:

• Your 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 daytime telephone number of the person directly responsible for
maintaining the unit.

Do not include accessories such as manuals, audio cables, footswitches, etc. with the unit, unless
specifically requested to do so by Lexicon Customer Service personnel.

2-1

Chapter 3 Spec ifications

Audio Inputs and Outputs

Audio Inputs - 8 stereo pairs (RCA) or 5 stereo pairs and one 5.1-channel analog input
Digital Audio Inputs - 6 coaxial (RCA), 6 optical (5 TosLink, and 1 optical mini jack), 1 AES/EBU; coaxial and

optical inputs conform to IEC-958, S/PDIF standards

Sample Rates: 44.1, 48, 88.2, 96kHz
Accepts: 16-24 bits PCM audio, Dolby Digital, dts and dts-ES discrete data formats

Main Audio Outputs - 12 unbalanced (RCA) and 12 balanced (XLR, MC-12 Balanced only) for Front L/R,
Center, LFE, Subwoofer L/R, Side L/R, Rear L/R, Auxiliary L/R
Zone 2 Audio Outputs - 2 stereo pairs (RCA, one fixed and one variable output level); 2 balanced (XLR) for
L/R variable output (MC-12 Balanced only)
Record Audio Outputs - 2 stereo pairs (RCA, one fixed and one variable output level); 1 coaxial (RCA) and 1
optical (TosLink) S/PDIF output (in parallel)

Lexicon

Performance (Main Zone

Analog-to-Digital Conversion - 24-bit, 96kHz, dual-bit ∆Σ architecture
Digital-to-Analog Conversion - 24-bit, 44.1 to 192kHz, multi-bit ∆Σ architecture, operating in dual-mono

mode

Frequency Response - 10Hz to 20kHz, +0.1dB/-0.25dB, -0.75dB at 40 kHz, reference 1kHz
THD + Noise - Below 0.003% at 1kHz, maximum output level
Dynamic Range - 108dB minimum, 111dB typical, 22kHz bandwidth
Signal-to-Noise Ratio - 108dB minimum, 111dB typical, 22kHz bandwidth
Input Sensitivity - 200mVrms (2Vrms for maximum output level) at 0dB input gain
Input Impedance - 100kΩ in parallel with 150pF
Output Level - 150mVrms typical, 6Vrms maximum (RCA outputs); 300mVrms typ, 12Vrms maximum (XLR

outputs, MC-12 Balanced only); maximum value with full-scale input signal and volume at +12dB
Output Impedance - 100Ω in parallel with 150pF (RCA outputs); 50Ω in parallel with 150pF (XLR outputs,
MC-12 Balanced only)

)

Performance (Zone 2 and Record Zone)

Analog-to-Digital Conversion - 24-bit, 44.1 to 96kHz, dual-bit ∆Σ architecture (Record Zone only)
Digital-to-Analog Conversion - 24-bit, 44.1 to 192kHz, multi-bit ∆Σ architecture
Frequency Response - 10Hz to 20kHz, +0.1dB/-0.25dB, -0.75dB at 40kHz, reference 1kHz

THD + Noise Below 0.005% at 1kHz, maximum output level

Dynamic Range - 105dB minimum, 108dB typical, 22kHz bandwidth
Signal-to-Noise Ratio - 105dB minimum, 108dB typical, 22kHz bandwidth
Input Sensitivity - 200mVrms (4Vrms for maximum output level)
Input Impedance - 100 kΩ in parallel with 150pF
Output Level - 200mVrms typical, 4Vrms maximum (RCA outputs); 400mVrms typical, 8Vrms maximum (XLR

outputs, Zone 2 only, MC-12 Balanced only); maximum value with full-scale input signal and volume at 0dB
Output Impedance - 100Ω in parallel with 150pF (RCA outputs); 50Ω in parallel with 150pF (XLR outputs,
Zone 2 only, MC-12 Balanced only)

Video Inputs and Outputs

Video Inputs - 5 composite (RCA), 8 S-video, and 4 component video (3 RCA, 1 BNC)
Video Outputs - 4 composite (RCA, 2 monitor and 2 record), 4 S-video (2 monitor and 2 record), and 1

component (BNC)

Performance (Composite & S-video)

NTSC M, PAL, and SECAM compatible
Switching - Active
Output Level - 1.0V peak-to-peak
Impedance - 75Ω
Input Return Loss - >40dB
Differential Gain - <0.5%
Differential Phase - <0.5°
Bandwidth - >25MHz
K Factor - <0.3%

3-1

MC-12/MC-12 Balanced Service Manual

Gain - ±0.15dB
Signal/Noise Ratio - >70dB
Frequency Response - 10Hz to 10MHz + 0.1/-0.3dB

Performance (Component Video)

3-channel (Y, Pr, Pb), format-independent
Switching - Passive
Impedance - 75Ω
Bandwidth - >300MHz
Insertion Loss - <3dB

Other

Microphone Inputs - 4 3.5mm miniature phone jacks

Input sensitivity: 10mVrms (400mV maximum input level)
Input Impedance: 20kΩ (accepts balanced or unbalanced input signals)

Trigger Outputs - 1 power-on/off trigger, 2 programmable triggers; +12 VDC, 0.5 amps each; detachable
screw terminals

RS-232 Serial Input/Output - 2 9-pin D-sub connectors for system control and software upgrades
Power Requirements - 90-250 VAC, 50-60Hz, 90W (universal line input), detachable power cord
Dimensions -

MC-12: 17.3"w x 5.2"h x 14.85"d (440 x 132 x 377mm)
MC-12 Balanced: 17.3"w x 6.63"h x 14.85"d (440 x 169 x 377mm)

Weight -

MC-12: 36lbs (16.4kg)
MC-12 Balanced: 45lbs (20.5kg)

Rack Mounting - Optional brackets are available for mounting either unit in a standard 19" equipment rack
Environment

Operating Temp: 0° to 35°C (32° to 95°F)
Storage Temp: -30° to 75°C (-22° to 167°F)
Relative Humidity: 95% maximum without condensation

Remote Control - Hand-held, battery-powered infrared remote control unit

Batteries: Two AA

3-2

Lexicon

Chapter 4 Perfo rmance Verification

This section describes a quick verification of the operation of the MC-12/MC-12 Balanced and the integrity
of its analog and digital audio signal paths. Tests are included for the MC-12 Balanced version and can be
omitted when testing an MC-12/MC-12 Balanced.

Functional Tests

The following tests cover basic functions making sure the MC-12/MC-12 Balanced responds to button
commands from the remote as well as from its front panel.

INITIAL INSPECTION

1. Inspect the MC-12/MC-12 Balanced for obvious signs of physical damage.

2. Verify that all switches operate smoothly.

3. Remove the MC-12/MC-12 Balanced top cover.

4. Verify that all socketed ICs are correctly seated.

5. Verify that all ribbon cables are correctly installed and are secure.

6. Check for burnt or obviously damaged components.

7. Using the main power switch on the back of the MC-12/MC-12 Balanced, verify that it runs through its
Diagnostics Test and settles into the last state it was powered down in.

8. Check each of the front panel's switches for smooth mechanical operation, that each LED turns on and
off when depressed, and that the display acknowledges its function.

9. Press all the buttons on the remote and verify that the display is responding to all the remote
commands.

POWER SUPPLY TEST

The main power supply in the MC-12/MC-12 Balanced has an operational range of 100-240 VAC 50-60Hz,
90Watts.
The following test is for North American line voltage of 120VAC.

1. Set the variable AC supply to 0 volts.

2. Verify that the MC-12/MC-12 Balanced is powered off at its rear panel power switch.

3. Connect the power cord between the supply and the MC-12/MC-12 Balanced.

4. Turn on the MC-12/MC-12 Balanced using the rear panel power switch.

5. Slowly bring up the voltage to 120VAC.

6. The current draw will bounce up and down a bit and should not exceed 1.5amps. Once you have
achieved 120VAC the current draw on the Variac should not exceed 0.6amps. If the MC-12/MC-12
Balanced draws an excessive current, turn the MC-12/MC-12 Balanced off and check the power supply
rails for shorts to ground with the DMM meter.

7. Using the DMM measure all the power supply rails as stated by the test points below, being sure to use
the MC-12/MC-12 Balanced chassis as ground

8. Verify that all voltages are within the tolerance range shown.

Main Board

Supply Rail Tolerance Location (facing front panel)
+5VD 4.94-5.26 Lower left-hand corner connector J31 Red wires to ground.
Battery ≥ 2.5 Right side to the Left of U69; Measure the top of the battery

to ground

Note: If battery is in need of replacement

CAUTION

“CAUTION Danger of explosion if battery is incorrectly replaced. Replace only with the same or equivalent
type.”

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MC-12/MC-12 Balanced Service Manual

Analog Board

Supply Rail Tolerance Location (facing front panel)
+5VDC 4.75-5.25VDC Lower left hand corner connector J26.Red wire to ground

-5VDC 4.75-5.25VDC J26 Grey wire to ground
+15V 15.00-16.95 J26 Yellow wire to ground

-15V 14.25-15.75 J26 Blue wire to ground

Video Board

Supply Rail Tolerance Location (facing front panel)
+5VA 4.75-5.26 Lower left hand corner connector J22. Red wire to ground

-5VA 4.75-5.26 J22 Grey wire to ground

SETUP

In order to properly test the MC-12/MC-12 Balanced as described in this document, follow this setup
procedure before hand. It will make it much easier to follow along and perform each of the tests to follow.

1. Connect a small color monitor to the Composite output. This will allow you to fully view the diagnostic
menus of the MC-12/MC-12 Balanced.

2. Press and hold down the Zone 2 LD and the Record LD buttons on the front panel while powering up
the MC-12/MC-12 Balanced with the Main Power Switch on the back of the unit.

3. Once the display reads Lexicon, release the buttons on the front panel.

4. The Display on the front panel will read DIAGS MENU FUNCTIONAL TESTS and the monitor will have
a distorted, fractured-looking screen. This will happen on the monitor every time Diagnostics are
loaded.

5. To clear this display, press the Down Menu button (or turn the Volume knob) on the remote until you
see 'VIDEO I/O TESTS' displayed on their front panel.

6. Press the Right Menu Button (or the Mode button on the front panel) to enter the top of the VIDEO I/O
TESTS Menu.

7. Press the Down button (or Modes Down button on the front panel) several times until you see 'LOAD
FONT' displayed on the front panel.

8. Press Right Menu button (or Modes Down button on the front panel) to load the Fonts. The Monitor will
turn to a blue screen and the front panel will read VIDEO I/O TESTS completed.

9. Press the Left Menu button (or the Mode Up button on the front panel) to bring a clear legible menu to
the monitor screen. The monitor will display the VIDEO I/O TESTS menu with LOAD FONT highlighted
with a black bar.

10. Press the Left Menu button (or Mode Up button on the front panel) to bring you to the main DIAGS
MENU. The MC-12/MC-12 Balanced is now set up for monitor display for easier navigation through the
Diagnostic menus.

Note: The tests to follow assume you have entered the Diagnostics Menu as described above. Each test
will not repeat this setup procedure. It will make reference to it in order to set the stage for proper testing of
the MC-12/MC-12 Balanced.

AUDIO TESTS I/O

Analog Input To ALL Analog Outputs Test

In this test we will be verifying the path of the #1 Left and Right RCA paired input to all Analog Outputs both
RCA and XLR of the MC-12/MC-12 Balanced.

1. Connect the oscillator output to the Left and Right audio inputs marked #1 on the rear panel of the MC­12/MC-12 Balanced.

2. Connect the RCA Left and Right Front outputs of the MC-12/MC-12 Balanced to the amplifier Left and
Right inputs, and the outputs of the amplifier to a pair of speakers.

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Lexicon

3. If the MC-12/MC-12 Balanced is not in Extended Diagnostics, follow the setup procedure as described
at the beginning of this chapter.

4. In the Diagnostic Menu, select Audio I/O Tests.

5. Highlight Audio Input 1 Test, then press the Right menu button to engage the test. The MC-12/MC-12
Balanced is now set for audio coming into the Left and Right #1 RCA input to the Front Left and Right
RCA output and all the remaining RCA and XLR paired Left and Right audio output connections.

6. Slowly increase the volume on the amplifier to a comfortable listening level from the speakers.

7. Sweep the oscillator from 20Hz to 20kHz. Verify that you hear clean, clear audio coming from the
speakers.

8. Power down the amplifier and move the cables from the Front Left and Right outputs to the Center Left
and Right outputs.

9. Power on the amplifier and repeat the oscillator sweep as described in Step 7.

10. Repeat steps 8 and 9 for the remaining paired RCA outputs up to the Left and Right Aux. The Zone 2
and Record outs will be tested later.

11. To test the XLR paired outputs, power down the amplifier and remove the RCA output cables from the
MC-12/MC-12 Balanced to the amplifier.

12. Connect a pair of XLR cables. Connect the Front Left and Right balanced outputs of the MC-12/MC-12
Balanced to the XLR balanced input of the amplifier.

13. Repeat step 7.

14. Test the remaining XLR Left and Right balanced outputs and Center L/R to AUX L/R by powering down
the amp and repeating step 9.

All Remaining Analog Inputs to Analog Output Test

This test will verify the path of the remaining analog Left and Right inputs #2 to 8 to the Main Front Left and
Right analog outputs pass signal.

1. Connect the oscillator output to the Left and Right audio inputs marked #2 on the rear panel of the MC­12/MC-12 Balanced.

2. Connect the RCA Left and Right Front outputs of the MC-12/MC-12 Balanced to the amplifier Left and
Right inputs, and the outputs of the amplifier to a pair of speakers.

3. If the MC-12/MC-12 Balanced is not in Extended Diagnostics, follow the setup procedure as described
at the beginning of this chapter.

4. In the Diagnostic Menu, select Audio I/O Tests.

5. Highlight Audio Input 2 Test, then press the Right menu button to engage the test. The MC-12/MC-12
Balanced is now set for audio coming in to the Left and Right #2 RCA input and out to the Front Left
and Right RCA output.

6. Slowly increase the volume on the amplifier to a comfortable listening level from the speakers.

7. Sweep the oscillator from 20Hz to 20kHz. Verify that you hear clean, clear audio coming from the
speakers.

8. In order to test the remaining Analog inputs you must power down the amplifier and move the input
cables to the next paired audio inputs.

9. Repeat steps 4 & 5 above highlighting the next input to be tested in the Audio I/O Tests Menu and
select it by pressing the Right Menu button.

10. Repeat steps 5 to 7 until all the Audio Inputs have been tested.

Analog Input to Zone 2 Output Test

This test will verify the path of the #1 Left and Right RCA paired input to the Zone 2 Fix and Var outputs.

1. Connect the oscillator output to the Left and Right audio inputs marked #1 on the rear panel of the MC­12/MC-12 Balanced.

2. Connect the RCA Left and Right Zone 2 Fix outputs of the MC-12/MC-12 Balanced to the amplifier Left
and Right inputs, and the outputs of the amplifier to a pair of speakers.

3. If the MC-12/MC-12 Balanced is not in Extended Diagnostics, follow the setup procedure as described
at the beginning of this chapter.

4. In the Diagnostic Menu, select Audio I/O Tests.

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MC-12/MC-12 Balanced Service Manual

5. Highlight Audio Input 1 Test, then press the Right menu button to engage the test. The MC-12/MC-12
Balanced is now set for audio coming in to the Left and Right #1 RCA input to the ZONE 2 Left and
Right RCA outputs.

6. Slowly increase the volume on the amplifier to a comfortable listening level from the speakers.

7. Sweep the oscillator from 20Hz to 20kHz. Verify that you hear clean, clear audio coming from the
speakers.

8. Power down the amplifier and move the cables from the Zone 2 Fix Left and Right outputs to the Zone
2 Var Left and Right outputs.

9. Power on the amplifier and repeat the oscillator sweep as described in Step 7.

10. Remove the RCA output cables from the Zone 2 Var Left and Right outputs of the MC-12/MC-12
Balanced to the amplifier.

11. Connect a pair of XLR cables to the Left and Right Zone 2 Fix balanced outputs of the MC-12/MC-12
Balanced to the XLR balanced input of the amplifier.

12. Repeat steps 7 to 9.

All Remaining Analog Inputs to the ZONE 2 Fix Output Test

This test will verify the path of the remaining analog Left and Right inputs #2 to #8 to the Fix Zone 2 Left
and Right analog outputs pass signal.

1. Connect the oscillator output to the Left and Right audio inputs marked #2 on the rear panel of the MC­12/MC-12 Balanced.

2. Connect the RCA Left and Right Zone 2 Fix outputs of the MC-12/MC-12 Balanced to the amplifier Left
and Right inputs and the outputs of the amplifier to a pair of speakers.

3. If the MC-12/MC-12 Balanced is not in Extended Diagnostics, follow the setup procedure as described
at the beginning of this chapter.

4. In the Diagnostic Menu, select Audio I/O Tests.

5. Highlight Audio Input 2 Test, then press the Right menu button to engage the test. The MC-12/MC-12
Balanced is now set for audio coming into the Left and Right #2 RCA input to the ZONE 2 Left and
Right RCA outputs.

6. Slowly increase the volume on the amplifier to a comfortable listening level from the speakers.

7. Sweep the oscillator from 20Hz to 20kHz. Verify that you hear clean, clear audio coming from the
speakers.

8. In order to test the remaining Analog inputs to the Zone 2 Fix output, you must power down the
amplifier and move the input cables to the next paired audio inputs. Next, highlight the input being
tested in the Audio I/O Tests Menu and select it by pressing the Right Menu button.

9. Repeat steps 5 to 7 until all the Audio Inputs have been tested.

Analog Input to Record Output Test

This test will verify the path of the #1 Left and Right RCA paired input to the Record Fix and Var outputs.

1. Connect the oscillator output to the Left and Right audio inputs marked #1 on the rear panel of the MC­12/MC-12 Balanced.

2. Connect the RCA Left and Right Record Fix outputs of the MC-12/MC-12 Balanced to the amplifier Left
and Right inputs and the outputs of the amplifier to a pair of speakers.

3. If the MC-12/MC-12 Balanced is not in Extended Diagnostics, follow the setup procedure as described
at the beginning of this chapter.

4. In the Diagnostic Menu, select Audio I/O Tests.

5. Highlight Audio Input 1 Test then press the Right menu button to engage the test. The MC-12/MC-12
Balanced is now set for audio coming in to the Left and Right #1 RCA input to the Record Fix Left and
Right outputs.

6. Slowly increase the volume on the amplifier to a comfortable listening level from the speakers.

7. Sweep the oscillator from 20Hz to 20kHz. Verify that you hear clean, clear audio coming from the
speakers.

8. Power down the amplifier and move the cables from the Record Fix Left and Right outputs to the
Record Var Left and Right outputs.

9. Power on the amplifier and repeat the oscillator sweep as described in Step 7.

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All Remaining Analog Inputs to the Record Fix Output Test

This test will verify the path of the remaining analog Left and Right inputs #2 to #8 to the Fix Record Left
and Right analog outputs pass signal.

1. Connect the oscillator output to the Left and Right audio inputs marked #2 on the rear panel of the MC­12/MC-12 Balanced.

2. Connect the RCA Left and Right Record Fix outputs of the MC-12/MC-12 Balanced to the amplifier Left
and Right inputs and the outputs of the amplifier to a pair of speakers.

3. If the MC-12/MC-12 Balanced is not in Extended Diagnostics, follow the setup procedure as described
at the beginning of this chapter.

4. In the Diagnostic Menu, select Audio I/O Tests.

5. Highlight Audio Input 2 Test, then press the Right menu button to engage the test. The MC-12/MC-12
Balanced is now set to see audio coming in to the Left and Right #2 RCA input to the Record Fix Left
and Right outputs.

6. Slowly increase the volume on the amplifier to a comfortable listening level from the speakers.

7. Sweep the oscillator from 20Hz to 20kHz. Verify that you hear clean, clear audio coming from the
speakers.

8. In order to test the remaining Analog inputs to the Record Fix output, you must power down the
amplifier move the input cables to the next paired audio inputs. Next, highlight the input being tested in
the Audio I/O Tests Menu and select it by pressing the Right Menu button.

9. Repeat steps 5 to 7 until all the Audio Inputs have been tested.

Digital Input to all Analog Outputs Test

This test will verify the path of the #1 Coax digital input to all of the Main analog outputs, both RCA and XLR
of the MC-12/MC-12 Balanced.

Note: This test requires the use of a DVD player as a source. Therefore, the tests to follow will be run at the

44.1kHz sample rate. To properly test the full sample range of the MC-12/MC-12 Balanced, you will need to

repeat all of the Digital tests with 48, 88.2, and 96kHz sample rate sources.

1. Connect the digital output source DVD Player to the #1 Coax digital input on the rear panel of the MC­12/MC-12 Balanced.

2. Connect the RCA Left and Right Front outputs of the MC-12/MC-12 Balanced to the amplifier Left and
Right inputs and the outputs of the amplifier to a pair of speakers.

3. If the MC-12/MC-12 Balanced is not in Extended Diagnostics, follow the setup procedure as described
at the beginning of this chapter.

4. In the Diagnostic Menu, select Audio I/O Tests.

5. Highlight S/PDIF Input CX1 Test, then press the Right menu button to engage the test. The MC-12/MC­12 Balanced is now set to see digital audio from the S/PDIF #1 digital input to the Front Left and Right
RCA output and all the remaining RCA and XLR paired Left and Right audio output connections.

6. Press play on the DVD player.

7. Slowly increase the volume on the amplifier to a comfortable listening level from the speakers.

8. Verify that you hear clean, clear audio coming from the speakers.

9. Pause the DVD and power down the amplifier.

10. Move the cables from the Front Left and Right outputs to the Center Left and Right outputs.

11. Power on the amplifier press play on the DVD player and repeat Steps 7 - 8.

12. Repeat steps 7 - 10 for the remaining paired RCA outputs up to the Left and Right Aux. The Zone 2 and
Record outs will be tested later. Remove the RCA output cables from the MC-12/MC-12 Balanced to
the amplifier.

13. With a pair of XLR cables, connect the Left and Right balanced outputs of the MC-12/MC-12 Balanced
to the XLR balanced input of the amplifier.

14. Repeat steps 7 - 10 for the remaining paired XLR balanced outputs up to the Left and Right Aux. As in
the RCA test above the Zone 2 XLR will be tested later.

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MC-12/MC-12 Balanced Service Manual

All Remaining Digital Inputs to Analog Output Test

This test will verify the path of all the remaining Coax and Optical Digital inputs to the Main Front Left and
Right analog output.

Note: In order to test the Optical #6, which is an OMJ (Optical Mini Jack) style connector, you will need an
Optical to OMJ adapter in order to make the proper connection.

1. Connect the digital output source DVD player to the #2 Coax digital input on the rear panel of the MC­12/MC-12 Balanced.

2. Connect the RCA Left and Right Front outputs of the MC-12/MC-12 Balanced to the amplifier Left and
Right inputs and the outputs of the amplifier to a pair of speakers.

3. If the MC-12/MC-12 Balanced is not in Extended Diagnostics, follow the setup procedure as described
at the beginning of this chapter.

4. In the Diagnostic Menu, select Audio I/O Tests.

5. Highlight S/PDIF Input CX2 Test then press the Right menu button to engage the test. The MC-12/MC­12 Balanced is now set to see digital audio coming in to the S/PDIF #2 digital input to the Front Left and
Right RCA output.

6. Press play on the DVD player.

7. Slowly increase the volume on the amplifier to a comfortable listening level from the speakers.

8. Verify that you hear clean, clear audio coming from the speakers.

9. Pause the DVD and power down the amplifier.

10. In order to test the remaining Digital inputs both RCA and Optical you must move the Digital Input cable
to the next Digital input (RCA or Optical), then highlight the input being tested in the Audio I/O Tests
Menu and select it by pressing the Right Menu button.

11. Repeat steps 6 - 8 until all the remaining Digital Inputs have been tested.

Digital Input to Zone 2 Output Test

This test will verify the path of the #1 Coax Digital input to the Zone 2 Fix and Var Left and Right outputs.

1. Connect the digital output source DVD player to the #1 Coax digital input on the rear panel of the MC­12/MC-12 Balanced.

2. Connect the RCA Left and Right Zone 2 Fix outputs of the MC-12/MC-12 Balanced to the amplifier Left
and Right inputs and the outputs of the amplifier to a pair of speakers.

3. If the MC-12/MC-12 Balanced is not in Extended Diagnostics, follow the setup procedure as described
at the beginning of this chapter.

4. In the Diagnostic Menu, select Audio I/O Tests.

5. Highlight S/PDIF Input CX1 Test then press the Right menu button to engage the test. The MC-12/MC­12 Balanced is now set to see digital audio from the S/PDIF #1 digital input to the Front Left and Right
RCA output and all the remaining RCA and XLR paired Left and Right audio output connections.

6. Press play on the DVD player.

7. Slowly increase the volume on the amplifier to a comfortable listening level from the speakers.

8. Verify that you hear clean, clear audio coming from the speakers.

9. Pause the DVD and power down the amplifier.

10. Move the cables from the Zone 2 Fix Left and Right outputs to the Zone 2 Var Left and Right outputs.

11. Power on the amplifier press play on the DVD player and repeat step 7 - 8.

12. Pause the DVD and power down the amplifier.

13. Remove the RCA output cables from the Zone 2 Var Left and Right outs of the MC-12/MC-12 Balanced
to the amplifier.

14. With a pair of XLR cables connect the Left and Right Zone 2 Fix balanced outputs of the MC-12/MC-12
Balanced to the XLR balanced input of the amplifier.

15. Power on the amplifier, press play on the DVD player, and repeat Step 7 - 9.

All Remaining Digital Inputs to Zone 2 Output Test

This test will verify the path of all the remaining Digital Coax and Optical Digital inputs to the Zone 2 Fix
Front Left and Right analog output.

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Lexicon

Note: In order to test the Optical #6, which is an OMJ (Optical Mini Jack) style connector, you will need an
Optical to OMJ adapter in order to make the proper connection.

1. Connect the digital output source DVD player to the #2 Coax Digital input on the rear panel of the MC­12/MC-12 Balanced.

2. Connect the RCA Left and Right Zone 2 Fix outputs of the MC-12/MC-12 Balanced to the amplifier Left
and Right inputs and the outputs of the amplifier to a pair of speakers.

3. If the MC-12/MC-12 Balanced is not in Extended Diagnostics, follow the setup procedure as described
at the beginning of this chapter.

4. In the Diagnostic Menu, select Audio I/O Tests.

5. Highlight S/PDIF Input CX2 Test, then press the Right menu button to engage the test. The MC-12/MC­12 Balanced is now set to see digital audio from the S/PDIF #2 digital input to the Fix Left and Right
RCA output.

6. Press play on the DVD player.

7. Slowly increase the volume on the amplifier to a comfortable listening level from the speakers.

8. Verify that you hear clean, clear audio coming from the speakers.

9. Pause the DVD and power down the amplifier.

10. In order to test the remaining Digital inputs both RCA and Optical you must move the Digital Input cable
to the next Digital input (RCA or Optical), then highlight the input being tested in the Audio I/O Tests
Menu and select it by pressing the Right Menu button.

11. Repeat steps 6 - 9 until all the remaining Digital Inputs have been tested.

Digital Input to Record Output Test

This test will verify the path of the #1 Coax Digital input to the Record Fix and Var Left and Right outputs.

1. Connect the digital output source DVD player to the #1 Coax Digital input on the rear panel of the MC­12/MC-12 Balanced.

2. Connect the RCA Left and Right Record Fix outputs of the MC-12/MC-12 Balanced to the amplifier Left
and Right inputs and the outputs of the amplifier to a pair of speakers.

3. If the MC-12/MC-12 Balanced is not in Extended Diagnostics, follow the setup procedure as described
at the beginning of this chapter.

4. In the Diagnostic Menu, select Audio I/O Tests.

5. Highlight S/PDIF Input CX1 Test then press the Right menu button to engage the test. The MC-12/MC­12 Balanced is now set to see digital audio from the S/PDIF #1 digital input to the Record Fix Left and
Right RCA outputs.

6. Press play on the DVD player.

7. Slowly increase the volume on the amplifier to a comfortable listening level from the speakers.

8. Verify that you hear clean, clear audio coming from the speakers.

9. Pause the DVD and power down the amplifier.

10. Move the cables from the Record Fix Left and Right outputs to the Record Var Left and Right outputs.

11. Power on the amplifier and press play on the DVD player and repeat Steps 6 - 9.

All Remaining Digital Inputs to Record Output Test

This test will verify the path of all of the remaining Digital Coax and Optical Digital inputs to the Record Fix
Front Left and Right analog outputs in the test to follow.

1. Connect the digital output source DVD player to the #2 Coax Digital input on the rear panel of the MC­12/MC-12 Balanced.

2. Connect the RCA Left and Right Record Fix outputs of the MC-12/MC-12 Balanced to the amplifier Left
and Right inputs and the outputs of the amplifier to a pair of speakers.

3. If the MC-12/MC-12 Balanced is not in Extended Diagnostics, follow the setup procedure as described
at the beginning of this chapter.

4. In the Diagnostic Menu, select Audio I/O Tests.

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MC-12/MC-12 Balanced Service Manual

5. Highlight S/PDIF Input CX2 Test, then press the Right menu button to engage the test. The MC-12/MC­12 Balanced is now set to see digital audio from the S/PDIF #2 digital input to the Record Fix Left and
Right RCA outputs.

6. Press play on the DVD player.

7. Slowly increase the volume on the amplifier to a comfortable listening level from the speakers.

8. Verify that you hear clean, clear audio coming from the speakers.

9. Pause the DVD and power down the amplifier.

10. In order to test the remaining Digital inputs (both RCA and Optical) you must move the Digital Input
cable to the next Digital input (RCA or Optical), then highlight the input being tested in the Audio I/O
Tests Menu and select it by pressing the Right Menu button.

11. Repeat steps 6 - 9 until all the remaining Digital Inputs have been tested.

Digital Input to Digital Outputs Test

This test will verify the path of the S/PDIF #1 Digital input to the Digital S/PDIF outputs (RCA and Optical) of
the MC-12/MC-12 Balanced.

1. Connect the digital output source DVD player to the #1 Coax Digital input on the rear panel of the MC­12/MC-12 Balanced.

2. Connect the Coax S/PDIF output on the back of the MC-12/MC-12 Balanced to the digital input of the
DAT machine.

3. Connect the Left / Right analog outputs of the DAT to the Analog Left and Right inputs of the amplifier
and its outputs to a pair of speakers.

4. If the MC-12/MC-12 Balanced is not in Extended Diagnostics, follow the setup procedure as described
at the beginning of this chapter.

5. In the Diagnostic Menu, select Audio I/O Tests.

6. Highlight S/PDIF Input Test, then press the Right menu button to engage the test. The MC-12/MC-12
Balanced is now set to see digital audio from the S/PDIF digital #1 input to both the RCA and Optical
S/PDIF digital output connections.

7. Press play on the DVD player.

8. Slowly increase the volume on the amplifier to a comfortable listening level from the speakers.

9. Verify that you hear clean, clear audio coming from the speakers.

10. Power down the amplifier and MC-12/MC-12 Balanced move the digital cable from the S/PDIF digital
output to the Optical S/PDIF digital output.

11. Power on the amplifier and repeat Steps 7 - 9.

All Remaining Digital Inputs to Digital Output Test

This test will verify the path of all remaining Digital Coax and Optical Digital inputs to the S/PDIF RCA digital
output.

1. Connect the digital output source DVD player to the #2 Coax Digital input on the rear panel of the MC­12/MC-12 Balanced.

2. Connect the Coax S/PDIF output on the back of the MC-12/MC-12 Balanced to the digital input of the
DAT machine.

3. Connect the Left / Right analog outputs of the DAT to the Analog Left and Right inputs of the amplifier
and its outputs to a pair of speakers.

4. If the MC-12/MC-12 Balanced is not in Extended Diagnostics, follow the setup procedure as described
at the beginning of this chapter.

5. In the Diagnostic Menu, select Audio I/O Tests.

6. Highlight S/PDIF Input Test then press the Right menu button to engage the test. The MC-12/MC-12
Balanced is now set to see digital audio from the S/PDIF digital #2 input to the S/PDIF RCA digital
output.

7. Press play on the DVD player.

8. Slowly increase the volume on the amplifier to a comfortable listening level from the speakers.

9. Verify that you hear clean, clear audio coming from the speakers.

10. In order to test the remaining Digital inputs (both RCA and Optical) to the digital S/PDIF output, you
must power down the amplifier and move the Digital Input cable to the next Digital input (RCA or

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Lexicon

Optical). Next, highlight the input being tested in the Audio I/O Tests Menu and select it by pressing the
Right Menu button.

11. Repeat steps 7 - 9 until all the remaining Digital Inputs have been tested.

AES/EBU Digital Input to all Analog Outputs Test

This test will verify the path of the AES/EBU digital Input to all of the Main analog outputs both RCA and
XLR of the MC-12/MC-12 Balanced.

1. Connect the digital output source DVD player to the AES/EBU digital input on the rear panel of the MC­12/MC-12 Balanced.

2. Connect the RCA Left and Right Front outputs of the MC-12/MC-12 Balanced to the amplifier Left and
Right inputs and the outputs of the amplifier to a pair of speakers.

3. If the MC-12/MC-12 Balanced is not in Extended Diagnostics, follow the setup procedure as described
at the beginning of this chapter.

4. In the Diagnostic Menu, select Audio I/O Tests.

5. Highlight AES Input Test, then press the Right menu button to engage the test. The MC-12/MC-12
Balanced is now set to see digital audio from the AES digital #1 input to both the RCA and XLR.

6. Press play on the DVD player.

7. Slowly increase the volume on the amplifier to a comfortable listening level from the speakers.

8. Verify that you hear clean, clear audio coming from the speakers.

9. Pause the DVD and power down the amplifier.

10. Move the cables from the Front Left and Right outputs to the Center Left and Right outputs.

11. Power on the amplifier press play on the DVD player and repeat Step 7.

12. Repeat steps 7 - 9 for the remaining paired RCA outputs up to the Left and Right Aux. The Zone 2 and
Record outs will be tested later.

13. Remove the RCA output cables from the MC-12/MC-12 Balanced to the amplifier.

14. With a pair of XLR cables connect the Left and Right balanced outputs of the MC-12/MC-12 Balanced
to the XLR balanced input of the amplifier.

15. Repeat steps 7 - 9 for the remaining paired XLR balanced outputs up to the Left and Right Aux. As in
the RCA test above, the Zone 2 XLR will be tested later.

AES/EBU Digital Input to Zone 2 Output Test

This test will verify the path of the AES/EBU digital input to the Zone 2 Fix and Var RCA and XLR outputs.

1. Connect the digital output source DVD player to the AES/EBU digital input on the rear panel of the MC­12/MC-12 Balanced.

2. Connect the RCA Left and Right Zone 2 Fix outputs of the MC-12/MC-12 Balanced to the amplifier Left
and Right inputs, and the outputs of the amplifier to a pair of speakers.

3. If the MC-12/MC-12 Balanced is not in Extended Diagnostics, follow the setup procedure as described
at the beginning of this chapter.

4. In the Diagnostic Menu, select Audio I/O Tests.

5. Highlight AES Input Test, then press the Right menu button to engage the test. The MC-12/MC-12
Balanced is now set to see digital audio from the AES digital #1 input to both the RCA and XLR.

6. Press play on the DVD player.

7. Slowly increase the volume on the amplifier to a comfortable listening level from the speakers.

8. Verify that you hear clean, clear audio coming from the speakers.

9. Pause the DVD and power down the amplifier.

10. Move the cables from the Zone 2 Fix Left and Right outputs to the Zone 2 Var Left and Right outputs.

11. Power on the amplifier, press play on the DVD player, and repeat Steps 7 - 8.

12. Pause the DVD and power down the amplifier.

13. Remove the RCA output cables from the Zone 2 Var Left and Right outputs of the MC-12/MC-12
Balanced to the amplifier.

14. With a pair of XLR cables, connect the Left and Right Zone 2 Fix balanced outputs of the MC-12/MC-12
Balanced to the XLR balanced input of the amplifier.

15. Power on the amplifier, press play on the DVD player, and repeat Step 7 to 9.

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MC-12/MC-12 Balanced Service Manual

AES/EBU Digital Input to Record Output Test

This test will verify path of the AES/EBU digital input to the Record Fix and Var outputs.

1. Connect the digital output source to the AES/EBU digital input on the rear panel of the MC-12/MC-12
Balanced.

2. Connect the RCA Left and Right Record Fix outputs of the MC-12/MC-12 Balanced to the amplifier Left
and Right inputs and the outputs of the amplifier to a pair of speakers.

3. If the MC-12/MC-12 Balanced is not in Extended Diagnostics, follow the setup procedure as described
at the beginning of this chapter.

4. In the Diagnostic Menu, select Audio I/O Tests.

5. Highlight AES Input Test then press the Right menu button to engage the test. The MC-12/MC-12
Balanced is now set to see digital audio from the AES digital #1 input to both the RCA and Fix and Var
outputs.

6. Press play on the DVD player.

7. Slowly increase the volume on the amplifier to a comfortable listening level from the speakers.

8. Verify that you hear clean, clear audio coming from the speakers.

9. Pause the DVD and power down the amplifier.

10. Move the cables from the Record Fix Left and Right outputs to the Record Var Left and Right outputs.

11. Power on the amplifier press play on the DVD player and repeat Steps 7 - 9.

AES/EBU Digital Input to Digital Outputs Test

This test will verify the path of the AES/EBU Digital input to the Digital S/PDIF outputs (RCA and Optical) of
the MC-12/MC-12 Balanced.

1. Connect the digital output source to the AES/EBU digital input on the rear panel of the MC-12/MC-12
Balanced.

2. Connect the Coax S/PDIF output on the back of the MC-12/MC-12 Balanced to the digital input of the
DAT machine.

3. Connect the Left / Right analog outputs of the DAT to the Analog Left and Right inputs of the amplifier
and its outputs to a pair of speakers. If the MC-12/MC-12 Balanced is not in Extended Diagnostics,
follow the setup procedure as described at the beginning of this chapter.

4. In the Diagnostic Menu, select Audio I/O Tests.

5. Highlight AES Input Test, then press the Right menu button to engage the test. The MC-12/MC-12
Balanced is now set to see digital audio from the AES digital #1 input to both the RCA and Fix and Var
digital outputs.

6. Press play on the DVD player.

7. Slowly increase the volume on the amplifier to a comfortable listening level from the speakers.

8. Verify that you hear clean, clear audio coming from the speakers.

9. Power down the amplifier and MC-12/MC-12 Balanced and move the digital cable from the S/PDIF
digital output to the Optical S/PDIF digital output.

10. Power on the amplifier and repeat Steps 6 to 8.

Audio Performance Verification

Performing these tests assures that the audio signal paths in the MC-12/MC-12 Balanced are functional
and that the MC-12/MC-12 Balanced meets published specifications. These tests will verify the
performance of the A/D and D/A circuitry, gain, frequency response, THD+N, and S/N ratio.

AUDIO INPUTS RCA #1 LEFT AND RIGHT TO ALL LEFT AND RIGHT RCA/XLR OUTPUTS TESTS

This test will verify the specs of the main analog output channels for both RCA and XLRs.

Setup

1. Connect an audio cable between the output of the Low Distortion Oscillator and the MC-12’s Left RCA
#1 audio input.

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2. Connect an audio cable between the Left Front RCA output of the MC-12/MC-12 Balanced and the
input of the Distortion Analyzer.

3. Place the MC-12/MC-12 Balanced into Extended Diagnostics as described at the beginning of this
chapter.

4. In the Diagnostic Menu, select Audio I/O Tests.

5. Highlight Audio Input 1 Test, then press the Right menu button to engage the test. The MC-12/MC-12
Balanced is now set to see audio coming in to the Left #1 RCA input to the Front Left RCA output.

Test

1. Apply a 1kHz signal @ 12dBV (+ 4 Vrms) to the input of the MC-12/MC-12 Balanced.

2. Set the scale on the Distortion Analyzer to measure + 12dBV (+4 Vrms) signal level.

3. Turn all the filters off on the Analyzer.

4. Verify that the output level from the MC-12/MC-12 Balanced is +12dBV (+4 Vrms) + 3.71 to 3.45dBV.

5. Adjust the scale on the Distortion Analyzer to measure 0.005% THD-N and turn on the 30kHz low pass
or audio bandpass filter.

6. Verify that the THD-N measured is less than 0.003%.

7. Set the scale on the Distortion Analyzer to measure +12dBV (+4 Vrms) signal level.

8. Using the output level from Step 4 above, set for a 0dB reference to check Frequency Response for the
MC-12/MC-12 Balanced.

9. Turn the filter on the Analyzer off.

10. Sweep the oscillator frequency from 10Hz to 20kHz.

11. Verify the signal level is within +0.1/-0.25dBV (-0.75dBV @ 40Hz) of the reference level over the entire
sweep.

12. Set the scale on the Distortion Analyzer to measure –100dBr signal level with the filter on.

13. Turn off the oscillator to the MC-12/MC-12 Balanced and verify a noise level measurement <-108dBr.

14. Swap cables from the Left #1 RCA input to the Right #1 RCA input and the Left Front RCA output to the
Right Front RCA output.

15. Repeat Steps 1 to 13 above.

16. To test the remaining Left and Right RCA / XLR outputs for required specifications, you will need to
repeat the above tests using the same RCA #1 Left and Right inputs to the remaining RCA and XLR
Left and Right outputs.

17. Repeat steps 1 - 16 again until all the analog outputs are tested.

ALL REMAINING AUDIO RCA INPUTS LEFT AND RIGHT TO FRONT LEFT AND RIGHT RCA OUTPUT TESTS

Setup

1. Connect an audio cable between the output of the Low Distortion Oscillator and the MC-12’s Left RCA
#2 audio input.

2. Connect an audio cable between the Center RCA output of the MC-12/MC-12 Balanced and the input
of the Distortion Analyzer.

3. Place the MC-12/MC-12 Balanced into Extended Diagnostics as described at the beginning of this
chapter.

4. In the Diagnostic Menu, select Audio I/O Tests.

5. Highlight Audio Input 2 Test, then press the Right menu button to engage the test. The MC-12/MC-12
Balanced is now set to see audio coming in to the Left and Right #2 RCA input to the Front Left and
Right RCA output and all the remaining RCA and XLR paired Left and Right audio output connections.

Test

1. Apply a 1kHz signal @+12dBV (+4 Vrms) to the input of the MC-12/MC-12 Balanced.

2. Set the scale on the Distortion Analyzer to measure +12dBV (+4 Vrms) signal level.

3. Turn all the filters off on the Analyzer.

4. Verify that the output level from the MC-12/MC-12 Balanced is +12dBV (+4 Vrms) + 3.71 to 3.45dBV.

5. Adjust the scale on the Distortion Analyzer to measure 0.005% THD-N and turn on the 30kHz low pass
or audio bandpass filter.

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6. Verify that the THD-N measured is less than 0.003%.

7. Set the scale on the Distortion Analyzer to measure +12 dBV (+4 Vrms) signal level.

8. Using the output level from Step 4 above, set for a 0dB reference to check Frequency Response for the
MC-12/MC-12 Balanced.

9. Turn the filter on the Analyzer off.

10. Sweep the oscillator frequency from 10Hz to 20kHz.

11. Verify the signal level is within +0.1/-0.25dBV (–0.75dBV @ 40Hz) of the of reference level over the
entire sweep.

12. Set the scale on the Distortion Analyzer to measure –100dBr signal level with the filter on.

13. Turn off the oscillator to the MC-12/MC-12 Balanced and verify a noise level measurement <-108dBr.

14. Swap cables from the Left #2 RCA input to the Right #2 RCA input and the Left Front RCA output to the
Right Front RCA output.

15. Repeat Steps 1 - 13 above.

16. To test all the remaining Left and Right RCA inputs for required specifications you will need to repeat
Step 5 in the Setup section and engage the next Audio Input Test in the diagnostic menu.

17. Repeat steps 1 - 14.

AUDIO INPUTS RCA #1 LEFT AND RIGHT TO ZONE 2 LEFT AND RIGHT RCA FIX /VAR OUTPUTS AND ZONE 2 XLR OUTPUTS TESTS

Setup

1. Connect an audio cable between the output of the Low Distortion Oscillator and the MC-12’s Left RCA
#1 audio input.

2. Connect an audio cable between the Zone 2 Left Fix RCA output of the MC-12/MC-12 Balanced and
the input of the Distortion Analyzer.

3. Place the MC-12/MC-12 Balanced into Extended Diagnostics as described at the beginning of this
chapter.

4. In the Diagnostic Menu, select Audio I/O Tests.

5. Highlight Audio Input 1 Test, then press the Right menu button to engage the test. The MC-12/MC-12
Balanced is now set to see audio coming in to the Left #1 RCA input to the Zone 2 Left Fix RCA output.

Tests

1. Apply a 1kHz signal @+12dBV (+4 Vrms) to the input of the MC-12/MC-12 Balanced.

2. Set the scale on the Distortion Analyzer to measure +12dBV (+4 Vrms) signal level.

3. Turn all the filters off on the Analyzer.

4. Verify that the output level from the MC-12/MC-12 Balanced is +12dBV (+4 Vrms) + 3.71 to 3.45dBV.

5. Adjust the scale on the Distortion Analyzer to measure 0.005% THD-N and turn on the 30kHz low pass
or audio bandpass filter.

6. Verify that the THD-N measured is less than 0.003%.

7. Set the scale on the Distortion Analyzer to measure +12 dBV (+4 Vrms) signal level.

8. Using the output level from Step 4 above, set for a 0dB reference to check Frequency Response for the
MC-12/MC-12 Balanced.

9. Turn the filter on the Analyzer off.

10. Sweep the oscillator frequency from 10Hz to 20kHz.

11. Verify the signal level is within +0.1/-0.25dBV (–0.75dBV @ 40Hz) of the reference level over the entire
sweep.

12. Set the scale on the Distortion Analyzer to measure –100dBr signal level with the filter on.

13. Turn off the oscillator to the MC-12/MC-12 Balanced and verify a noise level measurement <-108dBr.

14. Swap cables from the Left #1 input to the Right #1 input and the Left Fix RCA output to the Right Fix
RCA output.

15. Repeat Steps 1 - 11 above.

16. Test the Zone 2 RCA Var outputs and the XLR Zone 2 outputs using the above test.

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AUDIO INPUTS RCA #1 LEFT AND RIGHT TO RECORD LEFT AND RIGHT RCA FIX /VAR OUTPUTS TESTS

Setup

1. Connect an audio cable between the output of the Low Distortion Oscillator and the MC-12’s Left RCA
#1 audio input.

2. Connect an audio cable between the Record Left Fix RCA output of the MC-12/MC-12 Balanced and
the input of the Distortion Analyzer.

3. Place the MC-12/MC-12 Balanced into Extended Diagnostics as described at the beginning of this
chapter.

4. In the Diagnostic Menu, select Audio I/O Tests.

5. Highlight Audio Input 1 Test, then press the Right menu button to engage the test. The MC-12/MC-12
Balanced is now set to see audio coming in to the Left #1 RCA input to the Record Left Fix RCA output.

Tests

1. Apply a 1kHz signal @+12dBV (+4 Vrms) to the input of the MC-12/MC-12 Balanced.

2. Set the scale on the Distortion Analyzer to measure +12dBV (+4 Vrms) signal level.

3. Turn all the filters off on the Analyzer.

4. Verify that the output level from the MC-12/MC-12 Balanced is +12dBV (+4 Vrms) +3.71 to 3.45dBV.

5. Adjust the scale on the Distortion Analyzer to measure 0.005% THD-N and turn on the 30kHz low pass
or audio bandpass filter.

6. Verify that the THD-N measured is less than 0.003%.

7. Set the scale on the Distortion Analyzer to measure +12 dBV (+4 Vrms) signal level.

8. Using the output level from Step 4 above set for a 0dB reference to check Frequency Response for the
MC-12/MC-12 Balanced.

9. Turn the filter on the Analyzer off.

10. Sweep the oscillator frequency from 10Hz to 20kHz.

11. Verify the signal level is within +0.1/-0.25dBV (–0.75dBV @ 40Hz) of the reference level over the entire
sweep.

12. Set the scale on the Distortion Analyzer to measure –100dBr signal level with the filter on.

13. Turn off the oscillator to the MC-12/MC-12 Balanced and verify a noise level measurement <-108dBr.

14. Swap cables from the Left #1 input to the Right #1 input and the Left Record Fix output to the Right
Record Fix output.

15. Repeat Steps 1 - 13 above.

16. Repeat the test above for the Left and Right Record Var outputs.

ALL DIGITAL AUDIO INPUTS COAX, OPTICAL, AES/EBU TO THE LEFT AND RIGHT FRONT RCA OUTPUTS TESTS

Having tested all Analog to Analog specifications in the above tests, it is now only necessary to prove that
all the Digital inputs pass specifications. This test will verify the specifications of all Digital Inputs to the
Front Left and Right RCA outputs.

Setup

1. Connect the digital output source to the #1 Coax digital input on the rear panel of the MC-12/MC-12
Balanced.

2. Connect the RCA Left Front output of the MC-12/MC-12 Balanced to the amplifier Left inputs and the
output of the amplifier to a pair of speakers.

3. Place the MC-12/MC-12 Balanced into Extended Diagnostics as described at the beginning of this
chapter.

4. In the Diagnostic Menu, select Audio I/O Tests.

5. Highlight S/PDIF Input CX1 Test, then press the Right menu button to engage the test. The MC-12/MC­12 Balanced is now set to see digital audio from the S/PDIF #1 digital input to the Front Left and Right
RCA output and all the remaining RCA and XLR paired Left and Right audio output connections.

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MC-12/MC-12 Balanced Service Manual

Tests

1. Apply a 1kHz signal @ +0.00dBFS to the input of the MC-12/MC-12 Balanced.

2. Set the scale on the Distortion Analyzer to measure +12dBV (+4 Vrms) signal level.

3. Turn all the filters off on the Analyzer.

4. Verify that the output level from the MC-12/MC-12 Balanced is +12dBV (+4 Vrms) +4.025 to 3.590dBV.

5. Adjust the scale on the Distortion Analyzer to measure 0.005% THD-N and turn on the 30kHz low pass
or audio bandpass filter.

6. Verify that the THD-N measured is less than 0.003%.

7. Set the scale on the Distortion Analyzer to measure +12 dBV (+4 Vrms) signal level.

8. Using the output level from Step 4 above set for a 0dB reference to check Frequency Response for the
MC-12/MC-12 Balanced.

9. Turn the filter on the Analyzer off.

10. Sweep the oscillator frequency from 10hz to 20kHz.

11. Verify the signal level is within +0.1/-0.25dBV (–0.75dBV @ 40Hz) of the reference level over the entire
sweep.

12. Set the scale on the Distortion Analyzer to measure –100dBr signal level with the filter on.

13. Turn off the oscillator to the MC-12/MC-12 Balanced and verify a noise level measurement <-108dBr.

14. Swap cables from the Coax #1 Digital input to the Coax #2 Digital input.

15. To test all the remaining Left and Right RCA inputs for required specifications you will need to repeat
Step 5 in the Setup section and engage the next Audio Input Test in the diagnostic menu.

16. Repeat steps 1 - 13.

Video Input / Output Tests

These tests will verify that all 17 video inputs and 9 outputs pass video. There are 3 different types of video
to be tested in the MC-12/MC-12 Balanced: Composite - 5 Input and 4 Outputs; S-Video - 8 Inputs and 4
Outputs; Component - 4 Inputs and 1 Output. The following tests, will verify that the MC-12/MC-12
Balanced is passing clear, clean video to it source. It is not necessary to enter the Extended Diagnostics as
we did in the Audio tests to perform the Video tests.

COMPOSITE INPUTS TO COMPOSITE (MAIN AND RECORD) OUTPUTS TESTS

This test will set up a simple pass through of Video information in order to verify the Composite video
switching properties of the MC-12/MC-12 Balanced.

Setup

1. Connect the Composite video output from the DVD to the MC-12's #1 Composite video input.

2. Connect the Composite video #1 Main output of the MC-12/MC-12 Balanced to the Monitor's
Composite video Input.

3. Turn on the DVD, Monitor, and MC-12/MC-12 Balanced.

4. The Monitor should have a blue screen display.

5. On the MC-12/MC-12 Balanced remote, press the DVD-1 button to select this as the Input for testing
the video paths.

6. Press the Menu button on the remote. The Main Menu should appear on the screen.

7. With the Down Menu button on the remote, scroll down to SETUP, then select by pressing the Right
Menu button.

8. The SETUP Menu will appear and the INPUTS at the top will be highlighted. At this point press the
Right Menu button again.

9. The INPUT SETUP Menu will appear. At the top will be DVD1. To keep things simple, use this DVD1
Input to test all the video inputs and outputs of the MC-12/MC-12 Balanced.

10. Press the Right Menu button. The MC-12/MC-12 Balanced will now be set to the DVD1 INPUT SETUP
Menu.

11. Using Down button scroll down to the VIDEO IN S-VIDEO-1 and press the Right Menu button.

12. Select any of the 5 Composite or 8 S-Video Inputs of the MC-12/MC-12 Balanced from the DVD1 Video
In Menu.

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13. Scroll to the COMPOSITE-1 Video input and press the Right Menu button. This will assign the
Composite Video input 1 Jack to all composite Video output jacks, both in Main and Record of the MC­12/MC-12 Balanced.

14. Press the OSD button on the remote. This will turn off the on-screen video information from the MC­12/MC-12 Balanced and allow you to view the video for the DVD. The video path is now set for testing.

Test

1. Load a disc into the DVD player and press play.

2. Verify a clean, undistorted picture appears on the screen.

3. Pause the DVD.

4. Test the remaining Composite outputs by switching the Composite output cable to Main2 and Record 1,
2 and repeating steps 1 - 3 above.

5. Pause the player.

6. To test the remaining Composite video inputs of the MC-12/MC-12 Balanced, leave the Composite
Video output on Record 2 output.

7. Switch from the Composite-1 input to the Composite-2 input.

8. Select the Composite-2 to 5 in the DVD1 VIDEO IN Menu as stated in the Setup section above, then
repeat steps 1 to 3 above.

S-VIDEO INPUTS TO S-VIDEO (MAIN AND RECORD) OUTPUTS TESTS

This test will set up a simple pass through of Video information in order to verify the S-Video switching
properties of the MC-12/MC-12 Balanced.

Setup

1. Connect the S-Video output from the DVD to the MC-12's #1 S-Video input.

2. Connect the S-Video #1 Main output of the MC-12/MC-12 Balanced to the Monitors S-Video Input.

3. Turn on the DVD, Monitor, and MC-12/MC-12 Balanced.

4. The Monitor should have a blue screen display.

5. On the MC-12/MC-12 Balanced remote, press the DVD-1 button to select this as our Input for testing
the video paths.

6. Press the Menu button on the remote. The Main Menu should appear on the screen.

7. With the Down Menu button on the remote, scroll down to SETUP, then select by pressing the Right
Menu button.

8. The SETUP Menu will appear and the INPUTS at the top will be highlighted. At this point press the
Right Menu button again.

9. The INPUT SETUP Menu will appear. At the top will be DVD1. To keep things simple, use this DVD1
Input to test all the video input and outputs of the MC-12/MC-12 Balanced.

10. Press the Right Menu button. The MC-12/MC-12 Balanced will now be set to the DVD1 INPUT SETUP
Menu.

11. Using Down button scroll down to the VIDEO IN S-VIDEO-1 and press the Right Menu button.

12. In the DVD1 VIDEO IN Menu, select any of the 8 S-Video Inputs of the MC-12/MC-12 Balanced to be
tested by scrolling down to it and selecting the video path to be tested by pressing the Right Menu
button.

13. At this time the MC-12/MC-12 Balanced is already set to S-Video-1 input to all the S-video outputs
(Main 1, 2 and Record 1, 2) of the MC-12/MC-12 Balanced.

14. Press the OSD button on the remote. This will turn off the on-screen video information from the MC­12/MC-12 Balanced and allow you to view the video for the DVD The video path is now set for testing.

Test

1. Load a disc into the DVD player and press play.

2. Verify a clean, undistorted picture appears on the screen.

3. Pause the player.

4. Test the remaining S-Video outputs by switching the S-Video output cable to Main2 and Record 1, 2
and repeating steps 1 - 3 above.

5. Pause the DVD player.

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MC-12/MC-12 Balanced Service Manual

6. To test the remaining S-Video inputs of the MC-12/MC-12 Balanced, leave the S-Video output on
Record 2 output.

7. Switch from the S-Video-1 input to the S-Video-2 input.

8. You must select the S-Video 2 - 8 in the DVD1 VIDEO IN Menu as stated in the Setup section above,
then repeat steps 1 - 3 above.

COMPONENT INPUTS TO COMPONENT OUTPUT TESTS

This test will set up a simple pass through of Video information in order to verify the Component video
switching properties of the MC-12/MC-12 Balanced.

Setup

1. Connect the 3-wire Component Video output from the DVD to the MC-12's Component Video #1 input.

2. Connect the 3-wire Component BNC video outputs of the MC-12/MC-12 Balanced to the Monitor's BNC
Component Video Inputs.

3. Turn on the DVD, Monitor, and MC-12/MC-12 Balanced.

4. The Monitor should have a blue screen display.

5. On the MC-12/MC-12 Balanced remote, press the DVD-1 button to select this as the Input for testing
the video paths.

6. Press the Menu button on the remote. The Main Menu should appear on the screen.

7. With the Down Menu button on the remote, scroll down to SETUP, then select by pressing the Right
Menu button.

8. The SETUP Menu will appear and the INPUTS at the top will be highlighted. At this point press the
Right Menu button again.

9. The INPUT SETUP Menu will appear. At the top will be DVD1. To keep things simple, use this DVD1
Input to test all the video input and outputs of the MC-12/MC-12 Balanced.

10. Press the Right Menu button. The MC-12/MC-12 Balanced will now be set to the DVD1 INPUT SETUP
Menu.

11. Using Down button scroll down to the COMPONENT IN and press the Right Menu button.

12. In the DVD1 COMPONENT Menu, select any of the 4 COMPONENT Video Inputs of the MC-12/MC-12
Balanced to be tested.

13. At this time the MC-12/MC-12 Balanced is already set to COMPONENT 1 Video input to the
COMPONENT Video output of the MC-12/MC-12 Balanced.

14. Press the OSD button on the remote. This will turn off the on-screen video information from the MC­12/MC-12 Balanced and allow you to view the video for the DVD. The video path is now set for testing.

Test

1. Load a disc into the DVD and press play.

2. Verify a clean, undistorted picture appears on the screen.

3. Pause the tape.

4. Test the remaining COMPONENT Video inputs of the MC-12/MC-12 Balanced, switch the
COMPONENT Video input cable to 2, 3, and 4 and repeat steps 1 - 3 above.

5. Pause the player after testing Component Video #3.

6. Remove the 3-wire RCA Component Video cable that connects the video output from the DVD player to
the back of the MC-12/MC-12 Balanced.

7. Using the 3-wire BNC Video cable, connect the Component Video output of the DVD player to the MC­12/MC-12 Balanced Component #4 video input.

8. Press play on the DVD player.

9. Verify a clean, undistorted picture appears on the screen.

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