After Sales Handset HSU–1 Technical Documentation Handset HSU–1 Introduction Main function of the HSU–1 Audio Handset is to form an electroacoustic interface between the user and the phone environment. Technical Summary The HSU–1 Audio Handset consists of handset with coil cord and of cradle.
After Sales Handset HSU–1 Technical Documentation Technical Specifications Modes of Operation DG–1 module has only one mode of operation. Audio paths will become active when the handset is lifted from the cradle. Otherwise muting is on. Maximum Ratings –supply voltage: 16.0 V –operation temperature range, specification: –...
After Sales Handset HSU–1 Technical Documentation External Signals and Connections The HSU–1 Audio Handset has an 8 pin modular connector at the end of the coil cord to the junction box. There are only five lines in use in the coil cord.
After Sales Handset HSU–1 Technical Documentation – HOOK switch ( REED relay ) – Voltage regulator Earphone and microphone paths are controlled by Hook switch, which is opened automatically, when the handset is lifted from the cradle. In the cradle there is a magnet and in the handset there is a reed relay. Reed relay controls audio switches.
After Sales Handset HSU–1 Technical Documentation Voltage Regulator Supply voltage to DG–1 module is fed via connector X1 pin 1. Voltage is regulated with regulator N1 ( LP2951 ACM ). Capacitors C4 and C1 are used to improve filtering. Bias voltage for Mic and Ear signals and amplifi- ers is made byamplifier N2C (TL074ID).
After Sales Handset HSU–1 Technical Documentation Parts List of DG1 (Version 1.1) Code 0200221 ITEM CODE DESCRIPTION VALUE TYPE R001 1414036 Chip resistor 8.2 k 5 % 0.1 W 0805 R002 1412430 Chip resistor 10 k 5 % 0.1 W 0805 R003 1413635 Chip resistor 100 k...
After Sales Handset HSU–1 Technical Documentation C015 2310544 Ceramic cap. 1.0 n 5 % 50 V 0805 C016 2310336 Ceramic cap. 18 p 5 % 50 V 0805 C017 2604431 Tantalum cap. 10 u 20 % 16 V 6.0x3.2x2.5 C018 2604209 Tantalum cap.