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HF Junction Box HFJ–3 Technical Documentation Exploded View Assembly Parts ITEM 1 2 3 4 5 C1 Q’TY CODE DESCRIPTION VALUE, TYPE 4 9450067 9510078 9450066 6292014 Cover EMC cover Bottom cover PT screw Type label HFJ–3 BC4B junction module 1D 21307 3D 21558 1D 21305 KB25x16 FeZn Original 50/96 0200180 Page – 21
HF Junction Box HFJ–3 V271 V272 V274 V292 V293 V311 V312 V340 V341 V342 V343 V344 V345 V346 V347 D130 D131 N100 N110 N230 N250 N270 N310 N320 X170 X210 X230 X250 X290 4108639 4110195 4200603 4107160 4106769 4106769 4106769 4200917 4200917 4200909 4108639 4200909 4200917 4200917 4107160 4375060 4309914 4305236 4301199 4300269 4303439 4301062 4309488 4309488 5416517 5439668 5407002 5407006 5401050 7510302 9853993 9853993 Page – 20 Diode x 2 BAS28 Zener diode BZX84 Transistor BCX17 Zener diode BZX84 Zener
HF Junction Box HFJ–3 Technical Documentation C295 C296 C297 C298 C310 C311 C313 C340 C341 C342 L100 L101 L102 L161 L210 2310488 2310791 2310488 2310488 2310791 2604431 2310738 2310424 2310424 2310791 3607555 3607555 3607555 3606946 3607898 Ceramic cap. 330 p Ceramic cap. 33 n Ceramic cap. 330 p Ceramic cap. 330 p Ceramic cap. 33 n Tantalum cap. 10 u Ceramic cap. 4.7 n Ceramic cap. 100 p Ceramic cap. 100 p Ceramic cap. 33 n Coil Coil Coil Ferrite bead 0.
HF Junction Box HFJ–3 C133 C134 C135 C136 C137 C138 C139 C140 C143 C144 C170 C171 C172 C173 C174 C175 C177 C190 C191 C213 C214 C215 C216 C217 C220 C221 C230 C231 C233 C234 C235 C250 C251 C252 C253 C254 C256 C257 C258 C259 C270 C271 C272 C273 C291 C293 C294 2310791 2310791 2310343 2310343 2310488 2310488 2604209 2310791 2310791 2310791 2310738 2310738 2604209 2604209 2310791 2310791 2310488 2604209 2310791 2501605 2310791 2604209 2507479 2310791 2310488 2310488 2310463 2604022 2310463 2310505 2310752 23107
HF Junction Box HFJ–3 Technical Documentation R302 R310 R311 R312 R313 R314 R315 R316 R317 R318 R319 R320 R321 R322 R324 R325 R326 R327 R328 R340 R341 R342 R343 R344 R345 R346 R347 R348 R349 R350 R351 R352 R353 C100 C101 C102 C103 C104 C105 C106 C107 C109 C110 C111 C130 C131 C132 1412409 1416160 1416160 1412409 1412409 1414212 1416160 1416160 1416160 1413635 1413635 1412416 1416160 1412416 1413642 1413642 1412430 1412430 1412416 1412416 1414406 1412430 1412729 1412536 1414406 1412416 1413716 1413723 1412
HF Junction Box HFJ–3 R159 R160 R170 R171 R172 R173 R174 R175 R190 R191 R192 R193 R194 R195 R211 R212 R213 R214 R215 R216 R217 R219 R230 R235 R236 R237 R250 R251 R252 R253 R254 R255 R256 R270 R271 R273 R275 R276 R277 R292 R293 R294 R295 R296 R299 R300 R301 1412729 1413829 1412261 1412261 1412430 1413635 1412303 1412303 1412430 1412430 1412416 1412430 1413804 1413635 1413716 1412409 1413635 1413635 1413635 1413635 1412409 1412729 1414212 1412416 1412416 1412416 1412409 1413829 1412729 1412536 1413829 14125
HF Junction Box HFJ–3 Technical Documentation Parts List BC4B (Version 2.
HF Junction Box HFJ–3 Layout Diagram of BC4B Page – 14 Technical Documentation (Version 04) Original 50/96
Technical Documentation HF Junction Box HFJ–3 Circuit Diagram Original 50/96 Page – 13
HF Junction Box HFJ–3 Technical Documentation Block Diagram Page – 12 Original 50/96
HF Junction Box HFJ–3 Technical Documentation Microphone Amplifier Handsfree microphone signal is amplified in N230, and directed to handportable XMIC line or accessories MIC line in audio switch block. The accessory supply voltage +VBS must be turned on when this amplifier is used, because it is supply voltage for this block too. Signals Passed between the Mic. Amp. Block & Other Blocks: Name Description HF_MIC Amplified hands free microphone output signal to audio switch –block.
HF Junction Box HFJ–3 Technical Documentation External I/O This block consists of car ignition key sense and car radio mute. When pin 2 at connector X210 is connected to car battery voltage, an interrupt pulse for processor is generated. If processor is in power down mode it wakes up. Processor can also read ignition key state. In power on mode this state is continuously polled, and an mbus message is send to handportable, when this state changes.
HF Junction Box HFJ–3 Technical Documentation Signals Passed between the Charger Block & Other Blocks: Name Description +VPB Supply voltage for power section +VCH Supply voltage for oscillator and comparators CH_ON On/off control LO_V Low voltage turn off IO_EN Reference voltage +5 V +VC Output voltage/current PGND Ground for output (”power ground”) Audio Switches Audio paths are controlled by seven CMOS analog switches N320 and N310.
HF Junction Box HFJ–3 Technical Documentation Signals Passed between the Control Block & Other Blocks are: Name Description PWR_ON Accessory power switch on/off. CH_ON Charger on/off. SCL/TXI IIC bus clock for booster/booster error indication. IO_EN Voltage for several pull–up resistors (see circuit diagram). In power down mode this signal is low level, to reduce current consumption. XPWR Handset’s power on switch state. IGNS Car ignition switch state. RXD Mbus receive data.
HF Junction Box HFJ–3 Technical Documentation 7 XMIC/JCONN Audio signal from accessories or HF microphone to HP. 100 kΩ pull–up to +5 V; d.c. level indicates connection of HFJ–3 box to HP. 8 XEAR/HFJPWR Audio signal from handportable (received audio) to accessories or HF speaker. 1 MΩ pull–up resistor to +VBAT. Drop down of current from this pin turns on +5 V supply to processor.
HF Junction Box HFJ–3 Technical Documentation Accessory Connector X170 Pin Name Description 1 +VBS Power supply for accessories; HFJ–3 turns this voltage on and off under handportable control. 2 DGND Digital ground. 3 M2BUS Serial mbus data between handset, HFJ–3 and accessories. 4 LSP Not connected. 5 PWR This signal is pulled to +5 V at HFJ–3 via internal resistor. Indicates external handset power on switch state to HFJ–3 box. 6 AGND Analog ground.
HF Junction Box HFJ–3 Technical Documentation External Signals and Connections The module is provided with five external connectors: power supply connector, external microphone connector, external speaker connector, handportable connector, and accessory connector. Power Supply Connector X210 Pin Name Description 1 XCRM External car radio mute. open collector output; when muted, state at this output is pulled down, when not muted this output is in high impedance state.
HF Junction Box HFJ–3 Technical Documentation Booster Interface (used only with NHC–1/3): When requested via mbus message, HFJ–3 can read booster tuning values from booster EEPROM and send them to the handportable. Tuning values can also be written to booster EEPROM. Technical Specifications Modes of Operation Power Off Mode The battery voltage is always connected to accessory and charger power switches. The rest of the circuitry does not receive supply voltages.
Technical Documentation HF Junction Box HFJ–3 HF Junction Box HFJ–3 Introduction The HFJ–3 hands–free junction box provides and controls the supply voltages for the accessories and charge current for the handportable. In addition, it controls the audio paths to accessories and hands–free equipment.
HF Junction Box HFJ–3 Technical Documentation CONTENTS HF Junction Box HFJ–3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –3 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Main Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Accessories Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . Audio Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
After Sales Technical Documentation HF Junction Box HFJ–3 Original 50/96 NMP Part No.
