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Guidelines for service technicians to prevent hazards like fire and electric shock.
Information and precautions regarding lead-free solder usage in manufacturing and repair.
Visual representation of the telephone's internal circuit blocks and connections.
Detailed explanation of power supply, bell ringer, and line interface circuit functions.
Tips and procedures for service technicians regarding operation.
Procedure to reset the dial lock password if forgotten.
Common symptoms and their corresponding cures for troubleshooting.
Diagnostic flowchart for issues related to pulse dialing.
Diagnostic steps for problems encountered with tone dialing.
Troubleshooting procedure for when the unit does not ring despite an incoming signal.
Step-by-step guide on how to take the unit apart for servicing.
Detailed procedure for replacing flat package ICs, including preparation and removal steps.
Reference for pin configurations and identification of electronic components.
Important notes and safety warnings before consulting schematic diagrams.
Detailed main circuit diagram of the telephone unit.
Circuit diagram illustrating the operational logic and button functions.
Top-side view of the main printed circuit board showing component placement.
Bottom-side view of the main printed circuit board showing traces and connections.
Top-side view of the operational printed circuit board showing component placement.
Bottom-side view of the operational printed circuit board showing traces and connections.
List and diagram of cabinet parts and electrical components for replacement.
List of accessories and how the product is packed for shipment.
List of replacement parts for the base unit, including cabinet and electrical components.
List of replacement parts for the main printed circuit board, including ICs, transistors, and diodes.
List of replacement parts for the operational printed circuit board.
List of accessories and packing materials for the product.
List of screws used in the assembly and replacement process.
General