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Introduction

Computer Program Copyrights

The Motorola products described in this manual may include Motorola computer programs

worldwide to Motorola. Laws in the United States and other countries preserve for Motorola,

Inc. certain exclusive rights to the copyrighted Introduction computer programs, including the

exclusive right to copy, reproduce, modify, decompile, disassemble, and reverse-engineer the

Motorola computer programs in any manner or form without Motorola's prior written consent.

Furthermore, the purchase of Motorola products shall not be deemed to grant either directly or

by implication, estoppel, or otherwise, any license or rights under the copyrights, patents, or

patent applications of Motorola, except for a nonexclusive license to use the Motorola product

and the Motorola computer programs with the Motorola product.

Using this service manual and the suggestions contained in it assures proper installation,

operation, and maintenance of C257/C261 telephones. Refer questions about this manual to the

nearest Customer Service Manager. This manual contains mechanical service information

required for the equipment described and is current as of the printing date.

Audience

This document aids service personnel in testing and repairing C257/C261 telephones Service

personnel should be familiar with electronic assembly, testing, and troubleshooting methods,

and with the operation and use of associated test equipment.

Scope

This manual provides basic information relating to C257/C261 telephones, and also provides

procedures and processes for repairing the units at Level 1 and 2 service centers, including:

•

Unit swap out

•

Repairing of mechanical faults

•

Basic modular troubleshooting

•

Testing and verification of unit functionality

Initiate warranty claims and send faulty modules to Level 3 or 4 repair centers.

July 1, 2005

C257/C261