COBHAM 245 User manual

Copyright 2005 by Cobham
Installation and Operation Manual
245 Speaker Amplifier
SM245
REV 4.20
IMPORTANT NOTICE
Chelton Avionics Inc. doing business as Wulfsberg
Electronics Division is responsible for full distribution and
revisions of ICA's (Instructions for Continued
Airworthiness).
For inquiries regarding the content and currency of this
manual contact Wulfsberg Electronics Division, 6400
Wilkinson Drive, Prescott, Arizona, 86301. Telephone
[phone] or refer to the following website:
www.wulfsberg.com for more information.

245 Speaker Amplifier
SM245 Installation and Operation Manual
Installation and Operation Manual Page ii
ENG-FORM: 800-0108.DOT
CONFIDENTIAL AND PROPRIETARY TO COBHAM
Prepared By: Checked By: Approved By:
Revision
Number Revision Description Issue Date
4.20 DCA W13221. In section 1.5, 245-001 input was erroneously listed as1.0
Vrms into 1800 ohms. Aug 29, 2013

245 Speaker Amplifier
SM245 Installation and Operation Manual
Installation and Operation Manual Page iii
ENG-FORM: 800-0108.DOT
CONFIDENTIAL AND PROPRIETARY TO COBHAM
Periodically Cobham will release manual amendments. In order to maintain the most
accurate and up to date manual these amendments should be carried out immediately
upon receipt and recorded on the following amendment record.
AMENDMENT RECORD
Amendment
Number Amendment Date Section(s) Changed Date Entered
Entered By
1 Jul19/06 2
Insert any Amendment Instruction sheets after this page.

MAINTENANCE
MANUAL AMENDMENT
Manual: SM245 Amendment #: 2
Document # SM245\Maintenance\809-0002 Amendment Date: Jan 2, 2007
Amendment # 2 Jan 2, 2007 Page 1
ENG-FORM: 809-0109.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
The purpose of this amendment is to add the latest drawing revisions to the manual.
Amendment Instructions:
1 Remove Pages Replace With Pages
6-1 Rev 4.10 Amendment 1 6-1 Rev 4.10 Amendment 2
2 Remove Drawings (Section 6) Replace or add Drawings (Section 6)
245\245-1 Rev 1.50 245\245-1 Rev 1.60
245-41\245-3 Rev A 245-41\245-3 Rev 1.11
245-41\245-41 sht 1 of 2 Rev 1.50 245-41\245-41 sht 1 of 2 Rev 1.60
245-41\245-41 sht 2 of 2 Rev 1.60 245-41\245-41 sht 2 of 2 Rev 1.70
245-51\245-001-3 Rev A 245-51\245-001-3 Rev 1.11
245-51\245-51 sht 1 of 2 Rev 1.20 245-51\245-51 sht 1 of 2 Rev 1.30
245-51\245-51 sht 2 of 2 Rev 1.40 245-51\245-51 sht 2 of 2 Rev 1.50
245-61\245-002-3 245-61\245-002-3 Rev 1.01
245-61\245-61 sht 1 of 2 Rev 1.20 245-61\245-61 sht 1 of 2 Rev 1.30
245-61\245-61 sht 2 of 2 Rev 1.30 245-61\245-61 sht 2 of 2 Rev 1.40
Note: Ensure that all drawings are inserted in the order shown on the latest drawing lists.
5 Update the Amendment Record sheet at the front of the manual.
6 Insert this page into the manual after the Amendment Record sheet (page iii).
Manual Amendment ends after the following amended pages

245 Speaker Amplifier
SM245 Installation and Operation Manual
Installation and Operation Manual Page iv
ENG-FORM: 800-0108.DOT
CONFIDENTIAL AND PROPRIETARY TO COBHAM
Table of Contents
Section Title Page
1 Description
1.1 Introduction 1-1
1.2 Purpose of Equipment 1-1
1.3 Features 1-1
1.4 Specifications 1-1
1.4.1 Electrical Specifications 1-1
1.4.2 Physical Specifications 1-2
1.4.3 Environmental Specifications 1-2
1.5 Unit Nomenclature 1-2
2 Installation
2.1 Introduction 2-1
2.2 Unpacking and Inspection 2-1
2.3 Installation Procedures 2-1
2.3.1 Warnings 2-1
2.3.2 Cautions 2-1
2.3.3 Cabling and Wiring 2-1
2.3.4 Mechanical Installation 2-3
2.3.5 Post-Installation Checks 2-3
2.3.6 Log Entries 2-3
2.4 Airworthiness Limitations 2-4
2.5 Accessories Required But Not Supplied 2-4
2.6 Installation Drawings 2-4
3 Operation
3.1 Introduction 3-1
3.2 General 3-1
3.3 Operation Specifics 3-1