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Lexicon MC-12 Upgrade Instructions

Made by: Lexicon
Type: Upgrade Instructions
Category: Receiver
Pages: 12
Size: 0.08 MB

 

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A Harman International Company

MC-12

to MC-12 Balanced

Upgrade Instructions

 


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

WARNING

SAFETY SUMMARY

The following general safety precautions must be observed during all phases of operation, service, and repair of this instrument. Failure to
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, Inc. assumes no liability for failure to comply with these requirements.

GROUND THE INSTRUMENT

To minimize shock hazard, the instrument chassis and cabinet must
be connected to an electrical ground. The instrument is equipped
with a 3-conductor AC power cable. The power cable must be either
plugged into an approved 3-contact electrical outlet or used with a
3-contact to 2-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 Electro-technical Commission (IEC) safety
standards.

DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE

Do not operate the instrument in the presence of flammable gasses
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

KEEP AWAY FROM LIVE CIRCUITS 

(continued)

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.

 


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ELECTROSTATIC

DISCHARGE (ESD)

PRECAUTIONS

A Harman International Company

Lexicon, Inc.
3 Oak Park
Bedford, MA  01730-1441  USA
Tel   781-280-0300
Fax  781-280-0490
www.lexicon.com

Customer Support

Tel   781-280-0300
Fax  781-280-0495 (Sales)
Fax  781-280-0499 (Service)

Lexicon Part No. 070-14894  |  Rev 0  |  11/01

 

© 2001 Lexicon, Inc. All rights reserved.

This document should not be construed as a commitment on the part of Lexicon, Inc. The information it contains is subject to change
without notice. Lexicon, Inc. assumes no responsibility for errors that may appear within this document.

The following practices minimize possible damage to components resulting from electrostatic discharge or
improper insertion:
• 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. To make a plastic-laminated workbench anti-static, wash with a solution of
Lux liquid detergent, and allow to dry without rinsing.

CAUTION

These service instructions are for use by qualified personnel only.
Do not perform any servicing other than that contained in these
instructions unless qualified to do so. Refer to the Safety
Summary on the previous page prior to performing any service.

WARNING

 


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Turn off and disconnect all power
to the unit prior to performing the
upgrade.

MC-12 to MC-12 Balanced Upgrade Instructions

Lexicon

4

CONTENTS

This upgrade kit includes:

Item (Quantity)

Part No.

MC-12 Balanced chassis

(Multiple)

4x10mm screws (4)

640-10496

Black 3/8 inch hole plugs (4)

540-02472 

MC-12 to MC-12 Balanced

070-14894

Upgrade Instructions

This kit does not include the following tools, which are
also required to complete this upgrade:

Phillips head screwdriver (magnetic tip preferred).

Allen hex head wrench (2.5mm).

WARNING

INSTALLATION INSTRUCTIONS

Performing this upgrade is a straightforward process. But
to avoid complications, please read and follow these
instructions carefully. Pay particular attention to the
precautions listed in the Safety Summary (page 2), as
well as those included throughout the instructions.
Damage caused during installation may void the
manufacturer's warranty or standard repair policies.

1. Unplug the unit and, if necessary, remove the unit

from the rack.

2. Remove the 12 screws on the top cover of the unit,

as shown in the illustration below. This step requires
an Allen hex head wrench (2.5mm).

 


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3. Slide the top cover away from the front panel,

removing it from the unit.

4. Disconnect the following cables, referring to the

illustration above:

A. The ribbon cable connecting the main board to

the video board. Disconnect the cable from
location J26 on the main board by gently
rocking the cable from side to side and pulling it
away from the board.

MC-12 to MC-12 Balanced Upgrade Instructions

MC-12

5

B. The ribbon cable connecting the opto/mic

board to the analog board. Disconnect the cable
from location J30 on the analog board. (The
opto/mic board is located between the main
board and the analog board, directly behind the
MICROPHONE INPUTS on the rear panel.)

C. The ribbon cable connecting the analog board

to the main board. Disconnect the cable from
location J29 on the main board by releasing the
locked tabs on the side of the connector, then
pulling the cable away from the board.

D. The power supply cable from location J26 on the

analog board. The power supply cable may
require more force to remove than the other
cables.

E.

The power cable connecting the analog board
to the video board. Disconnect the cable from
location J25 on the analog board.

Main Board

Front Panel

Rear Panel

Analog
Board

Video Board

 


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MC-12 to MC-12 Balanced Upgrade Instructions

Lexicon

6

5. Remove the five rear panel screws shown in

the illustration below. These screws are connected to
the analog board.

6. Next, remove the three internal screws connecting

the analog board to the chassis. These screws are
shown in the illustration at the top of page 5. These
screws are black. Do not remove the silver screws.

7. Remove the analog board from the chassis and store

it in a static-free area. (For more information, see the
Electrostatic Discharge (ESD) Precautions on
page 3.)

8. Position the unit upside down, as shown in

the illustration below. Remove the two self-tapping
screws  on the access panel, also identified in the
illustration below. (The access panel will not be
reinstalled.)

9. Remove the four feet from the bottom of the MC-12,

removing the screws as shown in the illustration
below. (The MC-12 feet will not be re-attached. The
MC-12 Balanced chassis comes with its own rubber
feet already attached.)

 


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MC-12 to MC-12 Balanced Upgrade Instructions

MC-12

7

12. Next, attach the MC-12 Balanced chassis to the

MC-12 using the four 4x10mm screws provided in
the upgrade kit. These screws enter the chassis at the
points identified in the illustration below. It is
recommended to use a screwdriver with a magnetic
tip to tighten these screws. 

13. Once the screws have been tightened, cover them

with the 3/8 inch black hole plugs provided in the
upgrade kit.

10. Find the cable connected to location J15 on the XLR

board, which is located inside the MC-12 Balanced
chassis. Then, position the chassis upside down
above the MC-12 as shown in the illustration above,
aligning the loose end of the cable with the access
panel on the unit.

11. Slowly lower the chassis toward the unit, feeding the

loose end of the cable through the access panel. Do
this until the chassis is sitting on the unit, as shown
in the illustration at the right.

 


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MC-12 to MC-12 Balanced Upgrade Instructions

Lexicon

8

14. Position the unit on its feet, as shown in the

illustration at the right. Connect the inserted end of
the XLR board cable to location J33 on the bottom
of the analog board.

15. Slide the analog board into the chassis as shown in

the illustration at the right, making sure the analog
board connectors are lined up with the
corresponding holes in the rear panel. 

Be careful

not to pinch cables or hit the opto/mic board.

(The opto/mic board is located between the main
board and the analog board, directly behind the
MICROPHONE INPUTS on the rear panel.)

16. Re-attach the analog board to the chassis by

replacing the screws that were removed in Steps 5
and 6 (page 6). Replace the internal screws first
(Step 6).

17. Re-attach the five cables removed in Step 4 (page 5.)

18. Re-attach the top cover, sliding it toward the front

panel and replacing the 12 screws that were
removed in Step 2 (page 4).

 


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MC-12 to MC-12 Balanced Upgrade Instructions

MC-12

9

Notes

 


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MC-12 to MC-12 Balanced Upgrade Instructions

Lexicon

10

Notes 

(continued)

 


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MC-12 to MC-12 Balanced Upgrade Instructions

MC-12

11

Notes 

(continued)

 


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A Harman International Company

Lexicon, Inc.
3 Oak Park
Bedford, MA  01730-1441  USA
Tel   781-280-0300
Fax  781-280-0490
www.lexicon.com

Customer Support

Tel   781-280-0300
Fax  781-280-0495 (Sales)
Fax  781-280-0499 (Service)

Lexicon Part No. 070-14894  |  Rev 0  |  11/01