Hammarlund-stu-11-tone-signaling-equipement-service MANUAL – Service manual (PDF)

The Hammarlund Instruction and Service Manual provides detailed guidelines for the installation, operation, and maintenance of tone signaling equipment, including dual and single transmitter and receiver units. It also includes troubleshooting procedures, electrical characteristics, and schematic diagrams to assist in the setup and repair of these systems.

Brand: Hammarlund
Model: MANUAL
Type: service manual
File size: 3.8 MB

Manual Overview

The Hammarlund Instruction and Service Manual for tone signaling equipment provides detailed guidance on installation, operation, and maintenance for various transmitter and receiver units. The manual emphasizes troubleshooting procedures, including flowcharts for diagnosing common issues with power supply, transmitter, and receiver modules. It includes specific error codes and diagnostic steps to identify and resolve faults efficiently. Calibration and adjustment instructions are provided for both transmitter output levels and receiver input levels, with test meter connections detailed for precise adjustments. The manual offers board-level guidance, highlighting the importance of understanding module sections and their roles within the signaling units. Replaceable parts are listed with corresponding schematic diagrams to assist in component-level repairs. The manual also outlines the electrical characteristics of the equipment, ensuring technicians can maintain optimal performance and compatibility with communication circuits. Overall, the manual serves as a comprehensive resource for maintaining the reliability and functionality of Hammarlund tone signaling systems.

Quick Issues Covered

Diagnose power-up failures in DTU-11 and DTU-12 transmitters.
Adjust input/output levels for SRU-11 receiver units.
Trace circuits using schematics for DSU-11T signaling units.

Overview

This manual provides instructions for the installation, operation, and maintenance of Hammarlund tone signaling equipment. The equipment is used for remote control and supervision of industrial and utility systems, allowing for monitoring and adjustment of processes from a centralized control station. Tone signals can be transmitted over various communication links, including telephone lines and radio. The equipment consists of fixed frequency transmitters and receivers operating in the audio frequency range. A basic tone signaling channel includes a power supply, tone generator, and frequency determining unit at one station, and a power supply, receiver band pass filter, and tone receiver at another station. The system can operate on any of 57 standard frequencies between 425 and 6025 cps, and multiple channels can function simultaneously without interference if different frequencies are used. The equipment can be used for remote control, telemetering, alarm signaling, and other functions. Various types of relays are available to meet specific service requirements.