Crestron CNAMPX-12X60 User Manual
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.
©2006 Crestron Electronics, Inc.
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 CNAMPX16X60 Professional Audio Amplifiers. The amplifiers contain two-channel amplifier
modules (six in the CNAMPX-12X60 and eight in the CNAMPX-16X60), a
Crestron
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
service for further information.
®
remote control system (herein referred to as the Cresnet® system) interface
21 and contact Crestron customer
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 cau tions 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 ot her. A gr ou n di n g type
plug has two blades and a third grounding prong. The wide blade or the third
prong is provided for safety. When t he pr o v i ded pl u g d oes not fi t into an out l e t ,
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.
Unp lug 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 CNAMPX12X60 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
ONE RACK SPAC E
POWER
CRESTRON
PROFESSIONAL AUDIO AMPLIFIER
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 pr operly 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.
12 CHANNEL 60 WATTS
CNAMPX-12/16X60
ONE RACK SPAC E
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 flattipped 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
V
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.
CNAMPX MODEL
CNAMPX-12X60
CNAMPXI-12X60
CNAMPX-16X60
CNAMPXI-16X60
The characteristics of all listed fuses are FAST-ACTING.
1
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.
2
The fuse holder of international versions contains two active fuses. Verify the defective
fuse(s) and replace as necessary.
1
2
1
2
FUSE SIZE
DIAM. x LENGTH
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
CURRENT
RATING
OLTAGE
RATING
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
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