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After Sales Technical Documentation
Handset HSU1
Original 50/96
NMP Part No. 0275276
After Sales Handset HSU1 Technical Documentation
CONTENTS
Handset HSU1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Technical Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Use of Handset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Technical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Modes of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Microphone Side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Earphone Side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Sidetone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . External Signals and Connections . . . . . . . . . . . . . . . . . . External Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Circuit Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Earphone Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Microphone Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HOOK Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Voltage Regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Circuit Diagram version 6.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . Layout Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Parts List of DG1 (Version 1.1) Code 0200221 . . . . . . . . . Exploded view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Assembly parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3 3 3 4 4 4 4 4 4 4 4 5 5 5 5 6 6 6 7 7 8 9 10 12 12
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After Sales Technical Documentation Handset HSU1
Handset HSU1
Introduction
Main function of the HSU1 Audio Handset is to form an electroacoustic interface between the user and the phone environment.
Technical Summary
The HSU1 Audio Handset consists of handset with coil cord and of cradle. In the handset there is earphone and microphone with corresponding amplifiers. There is also a simply interface for controlling these functions. Electronics consist of DG1 handset module. Mechanical dimensions are small and mechanics consists of Acover, B cover and coil cord with the cradle. The HSU1 Audio Handset has a volume potentiometer.
Use of Handset
The HSU1 Audio Handset is designed to be a dummy handset with no display and no keyboard. Its use is to form an electroacouistical connection between the user and DCT environment. When not in use the handset is on the cradle. During the use the handset is lifted from the cradle and audio paths are opened.
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Technical Specifications
Modes of Operation
DG1 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: operation temperature range, specification: operation temperature range, operational: storage temperature range: 16.0 V 25 + 55 C 25 + 85 C 40 + 85 C
DC Characteristics
Symbol Parameter Minimum Typical/ Nominal
9.0 V 6.0 mA 7.7 V 6.0 mA 13.2 V 8.0 mA 8.3 V 8.0 mA
Maximum
VBS Ihs Vaudio Iaudio
Supply voltage for electronics Handset current consumption Regulated audio voltage Audio current consumption
16.0 V 12.0 mA 8.7 V 12.0 mA
AC Characteristics
Microphone Side Microphone amplifier gain for nominal signal is approx. 30 dB. Max output level is 1 Vrms. Idle noise of microphone amplifier should be less than 64 dBmOp (220 uV). Output impedance is < 300 ohms. Earphone Side Earphone amplifier input level is max. 503 mVrms. Acoustic idle noise of earphone is under 60 dBPa. Input impedance of earphone amplifier is > 10 kohm. Sidetone To be defined later.
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External Signals and Connections The HSU1 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.
External Connections
Functional Description
Main function of The HSU1 Audio Handset is to form an electroacoustic interface between the user and the phone environment. The HSU1 Audio Handset consists of handset with coil cord and of cradle. In the handset there is earphone and microphone with corresponding amplifiers.There is also a simply interface for controlling these functions. Electronics consist of DG1 handset module. Mechanical dimensions are small and mechanics consists of Acover, Bcover and coil cord with the cradle. The HSU1 Audio Handset has a volume potentiometer.
Circuit Description
HSU1 Audio Handset consists of the following functional blocks: Earphone amplifier Microphone amplifier
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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. The earphone amplifier is differential type and output is symmetrical. Volume is user controllable. Microphone is an electret microphone (condensator type) with field effect transistor. It requires a bias voltage above 2.0 Volts for normal operation. Bias voltage is generated with suitable deviding resistors and transistor from regulated 8.5 V. Earphone Amplifier Earphone amplifier is of differential type. N2A and N2B are used to form a differential amplifier with total amplification of 26 dB. Ear signal is fed to DG1 module via connector X1 pin 8. L2 and C3 are used to improve EMI characteristics. Capacitor C5 blocks DC of the signal analog switch N3A ( 74HC4066 ) switches Ear signal during ON HOOK state. Capacitor C24 is used to modificate frequency characteristics of Ear signal at higher frequencies. The gain of ear piece amplifier is set by resistors R14, R15, R16 and R17, R18. R19 is used to form side tone. Ear piece capsule is connected to the PCboard via connector X2. Resistors R20, R23, R26 and trimmer R22 attenuates Ear signal. Attenuation is about 20 dB when the trimmer is at minimum position. Microphone Amplifier Transistor V1 supplies bias voltage to Microphone. Bias voltage is filtered by C20, C11,C12, C14 and resistors R12, R13. Bias voltage is fed to microphone connector X3 via resistor R11. Bias voltage at connector X3 pin 1 is about 3.4 volt. Capacitor C10 blocks DC voltage of the Mic signal. Mic signal is amplified by N2D ( TL074ID ) Resistors R5, R7, R8, R9, R10 and capacitor C7, C9, C15 are used to filter Mic signal. Capacitor C8, C16, C23 are used to improve EMI characteristics. Gain of Mic amplifier is set by R7 and R24. Mic signal is fed to Ear amplifier via resistor R19 to form side tone signal. Mic signal is fed to connector X1 pin 7 via analog switch N3B ( 74HC4066 ). Capacitor C19 blocks DC voltage of the signal. HOOK Operation Both Mic signal and Ear signal are controlled by analog switches 74HC4066. Audio channels are open when Reed relay S1 is not activated. S1 is connected to Enable inputs of analog switches and R5 is a pull up resistor to open analog switches when S1 is open. When S1 is activated ( is closed ) analog switches are opened. Resistor R21 and capacitor C21 forms a filter to improve EMI characteristics. Original 50/96
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Voltage Regulator Supply voltage to DG1 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 amplifiers is made byamplifier N2C (TL074ID). Regulated voltage 5 volts is devided by resistors R1 and R2 and the amplified by N2C. Capacitor C18 filters regulated voltage.
Block Diagram
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Circuit Diagram version 6.0
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Layout Diagrams
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Parts List of DG1 (Version 1.1)
ITEM R001 R002 R003 R004 R005 R006 R007 R008 R009 R010 R011 R012 R013 R015 R016 R018 R019 R020 R021 R022 R024 R025 R026 R027 R028 R029 R030 R031 R032 C001 C002 C003 C004 C005 C006 C007 C008 C009 C010 C011 C012 C013 C014 CODE 1414036 1412430 1413635 1413635 1414029 1412261 1414109 1414109 1414109 1414109 1414029 1412729 1412609 1413723 1414029 1413723 1413723 1412254 1414029 1703319 1414004 1413635 1412409 1414406 1412729 1412536 1412261 1412261 1412173 2307816 2307816 2310336 2310336 2310784 2310336 2310738 2310336 2310752 2307816 2310336 2310336 2310512 2310512 DESCRIPTION Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Tpmet 0w5 2k2 m Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Ceramic cap. Ceramic cap. Ceramic cap. Ceramic cap. Ceramic cap. Ceramic cap. Ceramic cap. Ceramic cap. Ceramic cap. Ceramic cap. Ceramic cap. Ceramic cap. Ceramic cap. Ceramic cap. VALUE 8.2 k 10 k 100 k 100 k 3.3 k 100 15 k 15 k 15 k 15 k 3.3 k 33 k 27 k 470 k 3.3 k 470 k 470 k 270 3.3 k 680 100 k 1.5 k 5.6 k 33 k 22 k 100 100 33 47 n 47 n 18 p 18 p 100 n 18 p 4.7 n 18 p 10 n 47 n 18 p 18 p 560 p 560 p
Code 0200221 TYPE 5 % 0.1 W 0805 5 % 0.1 W 0805 5 % 0.1 W 0805 5 % 0.1 W 0805 5 % 0.1 W 0805 5 % 0.1 W 0805 5 % 0.1 W 0805 5 % 0.1 W 0805 5 % 0.1 W 0805 5 % 0.1 W 0805 5 % 0.1 W 0805 5 % 0.1 W 0805 5 % 0.1 W 0805 5 % 0.1 W 0805 5 % 0.1 W 0805 5 % 0.1 W 0805 5 % 0.1 W 0805 5 % 0.1 W 0805 5 % 0.1 W 0805 5 % 0.1 W 0805 5 % 0.1 W 0805 5 % 0.1 W 0805 5 % 0.1 W 0805 5 % 0.1 W 0805 5 % 0.1 W 0805 5 % 0.1 W 0805 5 % 0.1 W 0805 5 % 0.1 W 0805 20 % 25 V 0805 20 % 25 V 0805 5 % 50 V 0805 5 % 50 V 0805 10 % 25 V 0805 5 % 50 V 0805 20 % 50 V 0805 5 % 50 V 0805 20 % 50 V 0805 20 % 25 V 0805 5 % 50 V 0805 5 % 50 V 0805 5 % 50 V 0805 5 % 50 V 0805 Original 50/96
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C015 C016 C017 C018 C019 C020 C021 C022 C023 C024 C025 C026 C027 C028 C029 C030 C031 C032 C033 C034 C035 C036 C037 L001 L002 V001 V002 V003 V004 N001 N002 N003 S001 X001 X002
2310544 2310336 2604431 2604209 2604431 2604209 2307816 2604431 2310336 2310512 2310752 2310336 2310784 2310336 2310336 2310512 2310336 2310512 2310512 2310512 2310512 2310512 2310512 3608502 3608502 4200917 4110140 4110140 4110140 4301062 4306494 4309488 5304759 5416638 5416640 9854017 9854017
Ceramic cap. 1.0 n Ceramic cap. 18 p Tantalum cap. 10 u Tantalum cap. 1.0 u Tantalum cap. 10 u Tantalum cap. 1.0 u Ceramic cap. 47 n Tantalum cap. 10 u Ceramic cap. 18 p Ceramic cap. 560 p Ceramic cap. 10 n Ceramic cap. 18 p Ceramic cap. 100 n Ceramic cap. 18 p Ceramic cap. 18 p Ceramic cap. 560 p Ceramic cap. 18 p Ceramic cap. 560 p Ceramic cap. 560 p Ceramic cap. 560 p Ceramic cap. 560 p Ceramic cap. 560 p Ceramic cap. 560 p Chip coil Chip coil Transistor BC848B/BCW32 Zener diode BZX84 Zener diode BZX84 Zener diode BZX84 IC, regulator LP2951AC IC, 2 x op.amp. TL074ID IC, 4 x bi.switch 74HC4066 Reed relay 10at 0.5a 2x15 smd Connector 8pole right angle 1.5 Pin header m1x2 p1.5 90deg 1a0r02 PCB DG1 30.0X72.0X1.0 M2 6/PA PC board DG1
5 % 50 V 0805 5 % 50 V 0805 20 % 16 V 6.0x3.2x2.5 20 % 16 V 3.2x1.6x1.6 20 % 16 V 6.0x3.2x2.5 20 % 16 V 3.2x1.6x1.6 20 % 25 V 0805 20 % 16 V 6.0x3.2x2.5 5 % 50 V 0805 5 % 50 V 0805 20 % 50 V 0805 5 % 50 V 0805 10 % 25 V 0805 5 % 50 V 0805 5 % 50 V 0805 5 % 50 V 0805 5 % 50 V 0805 5 % 50 V 0805 5 % 50 V 0805 5 % 50 V 0805 5 % 50 V 0805 5 % 50 V 0805 5 % 50 V 0805 5 % Q=28/35 MHz 1206 5 % Q=28/35 MHz 1206 npn 30 V 100 mA SOT23 5 % 6.8 V 0.3 W SOT23 5 % 6.8 V 0.3 W SOT23 5 % 6.8 V 0.3 W SOT23 SO8S SO14 SO14S 1.5 1A0R02 30.0x72.0x1.0 m2 6/pa
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Exploded view
Assembly parts
ITEM 1 2 3 4 5 6 8 9 10 11 12 13 14 15 16 16 16 16 17 Q'TY CODE 9450302 9459393 9450132 9450133 9450304 9450305 9460098 9780086 6490220 7313054 9560015 9560001 9480171 6154430 9380154 9380154 9380154 9380154 9450075 DESCRIPTION Front cover Bottom cover Mic spacer Earphone spacer Cradle cover Cradle bottom Latch Coil cord Magnet Magnet pad Spring Spindle D shape sealing PT screw Label blank Label HSU1 Label HSU1A Label HSU1P Rubber pad VALUE, TYPE 2D 23151 HSU1 2D 23152 HSU1 4D 21588 NHE2 4D 21596 NHE2 2D 23153 HSU1 2D 23154 HSU1 3D 23155 HSU1 4C 22857 HSU1 4D 21413 CRE1 4D 21422 CRE1 4D 23498 HSU1 4D 21412 CRE1 4D 24417 KB25x8 FeZn clr 4D 22419 23.8x17.5 4D 23481 4D 24526 4D 24591 4D 21562 Original 50/96
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18 19 20 21 H1
5140379 5140578 9510193 6291917 0200221
Cond. microphone 62 ±3 dB Receiver capsule 103 ±2 dB Earpiece clip PT screw Handset module DG1
2.2 k 6x5 4D 24147 KB25x5 FeZn clr
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