C139
4 July 5, 2005
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About This Service Manual
Using this service manual and the suggestions contained in it assures proper installation,
operation, and maintenance of C139 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 C139 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 C139 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.
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