Crestron CNAMPX-12X60 Manuale utente

Crestron CNAMPX-12/16X60

Professional Audio Amplifiers

Service Guide

This document was prepared and written by the Technical Documentation department at:

Crestron Electronics, Inc.

15 Volvo Drive

Rockleigh, NJ 07647

1-888-CRESTRON

All brand names, product names and trademarks are the property of their respective owners.

Crestron CNAMPX-12/16X60 Professional Audio Amplifiers

Contents

Professional Audio Amplifiers: CNAMPX-12/16X60 1

Service Guide Overview.......................................................................................1

General Safety Precautions ....................................................................1

Rack Mounting Precautions...................................................................2

Electro-Static Discharge (ESD) Precautions..........................................3

AC Power Fuse Replacement...............................................................................3

Internal Replacement Procedures.........................................................................5

Disconnect Unit and Cover Removal.....................................................5

Amplifier Module Replacement.............................................................8

Audio Output Relay Board Replacement.............................................12

Cresnet System Interface Card Replacement.......................................12

In-Rush Surge Suppressor Replacement..............................................15

Cover Installation and Reconnect Unit ................................................16

Problem Solving.................................................................................................20

Further Inquiries...................................................................................20

Future Updates.....................................................................................20

Return and Warranty Policies.............................................................................21

Merchandise Returns / Repair Service.................................................21

CRESTRON Limited Warranty ...........................................................21

Service Guide - DOC. 5885B Contents •i

Crestron CNAMPX-12/16X60 Professional Audio Amplifiers

Professional Audio Amplifiers:

CNAMPX-12/16X60

Service Guide Overview

This guide provides service instructions for the CNAMPX-12X60 and CNAMPX-

16X60 Professional Audio Amplifiers. The amplifiers contain two-channel amplifier

modules (six in the CNAMPX-12X60 and eight in the CNAMPX-16X60), a

Crestron®remote control system (herein referred to as the Cresnet®system) interface

card, and an AC power fuse that are field replaceable. For any other components that

need replacement, the unit must be returned to the factory for repair service. Refer to

“Merchandise Returns/Repair Service” on page 21 and contact Crestron customer

service for further information.

The CNAMPX-12X60 and CNAMPX-16X60 amplifiers are also available as

international versions. All of the features are identical with the exceptions of

international AC power requirements, power cords and unit nomenclatures of

CNAMPXI-12X60 and CNAMPXI-16X60, respectively. Throughout this service

guide, all references apply to all models and all versions except where noted.

General Safety Precautions

 Read all precautions, information, and instructions provided in this service

guide.

 Retain this service guide.

 Heed all warnings and cautions printed in this service guide.

 Follow all instructions in the order that they are provided.

 Do not use this unit near water.

 Clean unit only with a damp cloth.

 Do not block any of the ventilation openings. Install or re-install in accordance

with the instructions in this service guide.

 Do not install unit near any heat sources such as radiators, heat registers, stoves,

or other apparatus that produce heat. If installing or re-installing multiple

amplifiers, follow the instructions provided in this service guide.

Service Guide – DOC.5885B Professional Audio Amplifiers: CNAMPX-12/16X60 •1

Professional Audio Amplifiers Crestron CNAMPX-12/16X60

 Do not defeat the safety purpose of the polarized or ground-type plug. A

polarized plug has two blades with one wider that the other. A grounding type

plug has two blades and a third grounding prong. The wide blade or the third

prong is provided for safety. When the provided plug does not fit into an outlet,

consult an electrician for replacement of the obsolete outlet.

 Protect the power cord from being walked on or pinched particularly at plugs,

convenience receptacles (if provided), and the point where they exit the unit.

 Unplug this unit during lighting storms or when unused for long periods of time.

Rack Mounting Precautions

WARNING: To prevent bodily injury when mounting or servicing this unit in a

rack, you must take special precautions to ensure that the system remains stable. The

following precautions are provided to ensure your safety.

 If the rack is provided with stabilizing devices, install the stabilizers before

mounting or servicing the unit in the rack.

 When an equipment rack is used, use caution when moving the rack/unit

combination to avoid injury or tip-over.

WARNING: The CNAMPX-12/16X60 amplifiers are heavy units. The CNAMPX-

12X60 weighs approximately 81.40 lbs (37.00 kg) and the CNAMPX-16X60 weighs

approximately 90.20 lbs (41.00 kg). Use more than one person to remove unit from

or install unit into rack.

 When mounting this unit in a partially filled rack, load the rack from the bottom

to the top with the heaviest component at the bottom of the rack.

 The unit should be mounted at the bottom of the rack if it is the only unit in the

rack.

CAUTION: Due to the heat dissipation of the CNAMPX-12/16X60 (and all audio

amplifiers in general), allow at least one free rack space above and below the

CNAMPX-12/16X60 for proper circulation. Refer to the diagram on the next page.

2 •Professional Audio Amplifiers: CNAMPX-12/16X60 Service Guide - DOC. 5885B

Crestron CNAMPX-12/16X60 Professional Audio Amplifiers

CNAMPX-12/16X60 Rack Spacing

POWER

CRESTRON

CNAMPX-12/16X60

ONE RACK SPACE

PROFESSIONAL AUDIO AMPLIFIER

12 CHANNEL 60 WATTS

NOTE: Reliable grounding of rack mounted equipment should be maintained.

Particular attention should be given to supply connections other than direct

connections to the branch circuit. (e.g., use of power strips).

Electro-Static Discharge (ESD) Precautions

The CNAMPX-12/16X60 contains ESD sensitive devices. Perform the following

procedures while wearing a grounding strap that is properly grounded or on a

grounded work station to avoid damaging the unit.

AC Power Fuse Replacement

The AC power fuse replacement of the CNAMPX-12/16X60 does not require cover

removal and can be performed with the unit installed in an equipment rack.

NOTE: The unit shown in this procedure is a CNAMPX-16X60. The procedure is

identical for all models and all versions except where noted.

The only tool required for fuse replacement is a #1 flat-tipped screwdriver. Complete

the following procedure in the order provided.

1. At the CNAMPX-12/16X60 front panel, position the POWER switch to

OFF.

2. At the rear panel, disconnect the AC power cord from the power port.

3. Refer to the diagram on the next page. Insert the tip of the #1 flat-

tipped screwdriver between the retainer tab of the fuse holder and the

fuse section of the input power assembly.

Service Guide - DOC. 5885B Professional Audio Amplifiers: CNAMPX-12/16X60 •3

Professional Audio Amplifiers Crestron CNAMPX-12/16X60

Fuse Holder Retainer Tab

4. Carefully push the fuse holder retainer tab upwards until the tab

releases and remove the fuse holder.

CAUTION: Refer to the table below. Use only the listed fuse for each

corresponding CNAMPX model and version to replace a defective fuse. The fuse is

available commercially but if a replacement fuse cannot be obtained, contact

Crestron customer service.

1/4 in x 1-1/4 in 12A 125V (or 250V)

5mm x 20mm 6.3A 250V

1/4 in x 1-1/4 in 15A 125V (or 250V)

5mm x 20mm 8A 250V

CNAMPX-16X60 1

CNAMPXI-12X60 2

CNAMPX-12X60 1

CNAMPX MODEL DIAM. x LENGTH

FUSE SIZE CURRENT

RATING

OLTAGE

RATING

The fuse holder of international versions contains two active fuses. Verify the defective

fuse(s) and replace as necessary.

The fuse holder of non-international versions contains a spare fuse. Verify that the spare

fuse is the same type, size and rating as the defective fuse and use as the replacement. If

the spare fuse is used as the replacement, obtain the same type, size and rating fuse to be

used as the spare as soon as possible.

The characteristics of all listed fuses are FAST-ACTING.

CNAMPXI-16X60 2

5. Remove the defective fuse(s) according to the appropriate step below.

5a. For NON-international versions, remove the defective fuse from

the right compartment of the fuse holder and insert the

replacement fuse.

5b. For international versions, verify the defective fuse(s) and replace

as necessary.

6. With the retainer tab facing downward, insert fuse holder into the fuse

section of the input power assembly until it snaps into place.

7. At the rear panel, re-connect the AC power cord to the power port.

8. At the front panel, position the POWER switch to ON.

4 •Professional Audio Amplifiers: CNAMPX-12/16X60 Service Guide - DOC. 5885B

Crestron CNAMPX-12/16X60 Professional Audio Amplifiers

Internal Replacement Procedures

Internal replacement procedures consist of Amplifier Module, Audio Output Relay

Board Replacement (not contained in CNAMPX-12X60), Cresnet System Interface

Card procedures, and In-Rush Surge Suppressor. Prior to performing any of these

procedures, the Disconnect Unit and Cover Removal procedure must be performed.

After the internal procedure(s) has been performed, the Cover Installation and

Reconnect Unit procedure is performed.

Disconnect Unit and Cover Removal

To replace the internal components of the CNAMPX-12/16X60, the unit must first

be disconnected and the cover removed. To disconnect the unit, the only tool

required is a #2 Phillips screwdriver and the only tool required to remove the cover is

the 1/8-inch hex wrench supplied with the unit. Complete the following procedure in

the order provided.

WARNING: The CNAMPX-12/16X60 amplifiers are heavy units. The CNAMPX-

12X60 weighs approximately 81.40 lbs (37.00 kg) and the CNAMPX-16X60 weighs

approximately 90.20 lbs (41.00 kg). Use more than one person to remove unit from

or install unit into rack.

CAUTION: To prevent stripping of screw heads, threads, or mounting holes, do

NOT overtighten screws. Tighten only to the specification listed in the individual

step(s).

NOTE: The unit shown in this procedure is a CNAMPX-16X60. The procedure is

identical for all models and all versions except where noted.

1. At the CNAMPX-12/16X60 front panel, position the POWER switch to

OFF.

2. At the rear panel, disconnect the AC power cord from the power port.

3. Detach the Cresnet system wiring connector from the NET port.

4. Using a #2 Phillips screwdriver, loosen the ground screw, remove the

ground wire, and retighten the screw.

5. Label and detach all audio input and output cables/wires from the

respective connectors.

6. Use at least two people to place the CNAMPX-12/16X60 on a suitable

work surface.

Service Guide - DOC. 5885B Professional Audio Amplifiers: CNAMPX-12/16X60 •5

Professional Audio Amplifiers Crestron CNAMPX-12/16X60

7. Depending upon the particular installation, rack mounting ears may or

may not be installed. Perform the appropriate step below.

7a. If rack mounting ears are NOT installed, continue to step 8below.

7b. If rack mounting ears are installed, refer to the diagram below.

Using the 1/8-inch hex wrench, remove the mounting ear screws

and ears from the left and right sides of the CNAMPX-12/16X60.

Mounting Ear Screws (Left-Side)

8. Refer to the diagram below. Using the 1/8-inch hex wrench, remove

the three screws from the top-front edge, then remove the four screws

from the left side and four screws from the right side.

Top-Front and Side Cover Screws

6 •Professional Audio Amplifiers: CNAMPX-12/16X60 Service Guide - DOC. 5885B

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