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Describes the HSU-1 Audio Handset components: handset, coil cord, cradle, amplifiers, interface, and module.
Explains the HSU-1 Audio Handset is a dummy handset used for electroacoustical connection.
DG-1 module has one mode; paths active when handset is lifted, otherwise muted.
Lists supply voltage and temperature ranges for specification and operation.
Details DC parameters like supply voltage, current consumption, and audio voltage.
Covers microphone and earphone side characteristics including gain, noise, and impedance.
Describes the 8-pin modular connector and the five lines used in the coil cord.
Lists functional blocks of the HSU-1 Audio Handset: Earphone amplifier, Microphone amplifier, HOOK Operation, Voltage Regulator.
Lists parts for assembly with item, quantity, code, description, and value/type.
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General
