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5 CIRCUIT DESCRIPTION AND SCHEMATIC DIAGRAMS

RM2042

5.4

DISPLAY UNIT (MODULE 4) PART NO. 626944

An LCD display of 2 times 24 characters with LED backlight is used to read out information to the operator.

DISPLAY MODULE
The display module is mounted on top of the display unit by means of two connectors and four screws.
The display module has a dot matrix LCD display with 2 times 24 characters and a build-in LCD driver
controller. This controller has a built-in character generator and a display data RAM. All the display
functions are controlled by instructions from the microprocessor.

DISPLAY INTERFACE
The display is interfaced with the microprocessor (module 2) through the ribbon cable connector P4.
The display enable pulse (E signal) is led directly to the LCD display by means of the strap field P5.
The delay circuit consisting of four NAND gates (U4) and three buffers (U5) is not used in this product,
but nevertheless it is mounted, because the display unit also is used in other of our products.

BRIGHTNESS CONTROL
Brightness or viewing angle control is performed by a four bit digital to analog converter, which gives 16
steps for regulation.
The D/A converter is build-up around four D-type flip-flops integreted in U1 and the operational amplifier
U2.1. The four D-type flip-flops is used as parallel input/output latches and each of the output pins Q1,
Q2, Q3 and Q4 are connected through one of the resistors R6, R8, R9 and R10 to the inverting input of
U2.1.
The output voltage from the D/A converter (i.e. output at U2.1) is divided by 2 by means of two resistors
(R16 and R18) and is then led to the non-inverting input at the amplifier U2.4. The inverting input at this
amplifier is connected to a resistor network, which include the NTC resistor R12. This circuit compensates
for the temperature change of the brightness controle voltage.
The output from the amplifier U2.4 is connected to the display brightness controle at pin 6 in the connector
J1.

BACKLIGHT CONTROL
The current through the backlight LED’s is controlled by the transistor Q1, which again is controlled by
the amplifier circuit build-up around U2.2.
The current running in the backlight LED’s is also running through the emitter resistors and the voltage
across R25 and R28 is therefore a function of the backlight current.
This voltage will almost be equal to the voltage at the non-inverting terminale, because of the relative large
voltage gain given by the ratio of R20 to R22.
The voltage at the non-inverting input is only determined by the two flip-flops Q5 and Q6 integreted in U1
and the voltage divider given by the resistors R21, R23 and R24. The current running in the emitter of Q1
can therefore be controlled by combinating the digital outputs from U1. This means, that the current
running through the backlight LED’s can be controlled by U1 in four steps, with step  1 as 0 mA and step  4
as 180 mA.

PAGE 5-23

9716

Содержание RM2042

Страница 1: ...S P RADIO A S AALBORG DENMARK TECHNICAL MANUAL FOR COMPACT VHF DSC RM2042 ...

Страница 2: ......

Страница 3: ...er mode INSTALLATION INFORMATION RM2042 This VHF DSC RM2042 is delievered with the service switch in position Service Mode After programming ofMMSInumbertheserviceswitchmustturnedintopositionUserMode Pleaserefertothedrawingbelow ...

Страница 4: ......

Страница 5: ...EPLACEMENT OF COMPONENTS 3 9 3 8 REPLACEMENT OF MODULES 3 9 3 9 NECESSARY ADJUSTMENTS AND CHECK AFTER REPAIR 3 10 3 10 PIN CONFIGURATIONS 3 12 4 MECHANICAL DESCRIPTION 4 1 MECHANICAL DISASSEMBLING AND UNITS LOCATION 4 1 5 CIRCUIT DESCRIPTION AND SCHEMATIC DIAGRAMS 5 1 INTERFACE MODULE 1 PART NO 626941 5 1 5 2 MICROPROCESSOR MODULE 2 PART NO 626942 5 7 5 3 RECEIVER MODULE 3 PART NO 626943 5 13 5 4 ...

Страница 6: ......

Страница 7: ...RM2042 CONTENTS 1 INTRODUCTION 1 1 GENERAL DESCRIPTION 1 2 1 2 TECHNICAL DATA 1 3 1 3 CONTROLS 1 4 1 4 PRINCIPLE OF OPERATION AND BLOCK DIAGRAM 1 6 9716 ...

Страница 8: ......

Страница 9: ...nt features to be used in normal VHF communication And of course a high security scrambler can be combined with the system This advanced communication controller uses a lot of front end technologies including a complete new range of components as well as the well known mechatronic design Resulting in a high quality product able to withstand the harsh environmental conditions present at sea In spit...

Страница 10: ...ction to on board navigational equipment giving automatic position update in DSC calls RM2042 can be connected to a standard line printer for print out of received messages and other valueable informations RM2042 includes as a standard an electronic memory message bank for different kinds of calls RM2042 includes a user programable quick call register not only for numbers but for complete user com...

Страница 11: ...ower Consumption Standby typ 0 1A Maximum 0 4A Temperature Range 20 C to 55 C Dimensions Height 98mm Width 225mm Depth 150mm Weight App 2kg RECEIVER WITH DECODER Receiver frequency 156 525MHz Sensitivity Symbol error rate below 0 01 at 0 25uV pd Spurious radiation Less than 2nW ENCODER Modulation 1700 Hz 400 Hz 1200 Baud 30 ppm Output level Adjustable between 10 dBm in 600 ohms balanced output Tx ...

Страница 12: ...nformation TRESS DIS Activated alone this button is used to enter the distress call menu in which you can compose your distress message to be transmitted NOTE Activated simultaneous with the SEND button a distress call will be initiated ADDR BOOK Selects the user programmed address book where you can save up to forty different complete call sequences CALL This button is used to enter the call comp...

Страница 13: ... At the first activation the first character will be displayed in the actual display input field at the second activation the second character will be displayed etc When button is activated the displayed character is selected and the next input field is shown with a blinking readout DEG This button is used as a delimiter when time data or position data are entered from the keyboard STOP ENT This k...

Страница 14: ... from the microprocessor board Internal power supply for the board is generated with two regulators one for 5V and one for 10V A power low condition is signaled from the 10V regulator to the microprocessor unit to secure a controlled power down sequence INTERFACE This module provides the necessary connections between the modules and between the modules and the externally connected equipment such a...

Страница 15: ...s made by means of a standard i o port circuit placed on the interface module while the strobe pulse needed for the printer is generated by a few gates on this module The serial communication with external equipment is executed via three USART s placed on the interface module An i o port circuit is used for the interface between the microprocessor and the different single bit control signals The s...

Страница 16: ......

Страница 17: ...com AF amp w mute Tx AF amps NMEA data intf Printf Intf C2149 PC intf XTAL 8 000MHz osc PROM memory EPROM memory RAM memory 4 9152 MHz XTAL osc I O ports divider int f commuc Modem uP unit decoder select Cicuit gen pulse strobe Printer uP control logic w reset Program able timers 32 76kHz clock Real time converter Voltage Keyboard light on off Power con P3 J1 Handset VHF P2 PRINTER J4 J3 C2149 PC ...

Страница 18: ......

Страница 19: ...RM2042 CONTENTS 2 INSTALLATION 2 1 MOUNTING POSSIBILITIES 2 1 2 2 POWER SUPPLY 2 5 2 3 HANDSET 2 5 2 4 ANTENNA 2 5 2 5 ELECTRICAL CONNECTIONS 2 6 9716 ...

Страница 20: ......

Страница 21: ...048 MOUNTED ON TOP OF EACH OTHER USING H2067 MOUNTING BRACKET FOR TABLETOP BULKHEAD OR DECKHEAD FOR MINI 1 4 BOX AND H2072 LASHING KIT This mounting bracket H2067 and lashing kit H2072 is used when RM2042 is to be mounted on top of each other and next to other units in the Compact 2000 programme mounted in H2055 mounting brackets H2072 225mm 213mm 55mm 60mm min 120mm min 80mm 215mm 27599 dimension...

Страница 22: ... mounting brackets For example when installing the RM2042 next to the HF SSB RE2100 it is possible to tilt both units in the same angle H2067 225mm 115mm 55mm min 90mm 55mm min 60mm 27582 55mm 55mm min 80mm min 100mm 27593 36 5 mm 175 mm 50 mm 8 mm 4 pcs 4 5 mm 55 mm 10 mm 27566A dimensions when using a right angled VHF plug dimensions when using a standard VHF plug Weight Mounting kit H2067 0 5 k...

Страница 23: ...en tilting the VHF DSC H2057 228mm min 104mm 71mm min 75mm 60mm 252mm min 45mm 27594 71mm 55mm max 177mm min 70mm min 100mm 27595 71mm 55mm min 100mm max 177mm min 70mm 27596 min 169mm max 185mm min 99mm min 156mm 27597 59mm 4 pcs 5 mm 71mm 238mm 27574A 59mm 4 pcs 5 mm 71mm 206mm 27575A Weight Mounting kit H2057 0 4 kg VHF DSC RM2042 2 0 kg dimensions when using a right angled VHF plug dimensions ...

Страница 24: ...t be kept to allow free air circulation ambient temperature max 40 C H2063 min 160mm 27580 4 5mm 4 5mm 16mm 16mm 16mm 16mm 4 stk 6mm 4 stk 3 5mm uns for M3 DIN 963 Cutting out 231x100mm 253mm 240mm 100mm 113mm 27444A Weight Mounting kit H2063 1 0 kg VHF DSC RM2042 2 0 kg 4 pcs M3x30 8 pcs M5x8 4 pcs M5x30 27581 PAGE 2 4 ...

Страница 25: ...to this unit instead The handset can be placed anywhere near the VHF DSC unit RM2042 The cable for the handset is five cored and must be connected to the rear of RM2042 by means of the 9 pole SUB D connector J1 1 For installation of the cable please see the drawings of the mounting brackets The cable grommet must be placed in the most convenient groove in the mounting bracket If more than one hand...

Страница 26: ......

Страница 27: ...3 P3 POWER CONNECTOR BATTERY EXT SUPPLY ON OFF BATTERY REMOTE AL CIRC EXT LOUDSPEAKER PIN 6 PIN 5 PIN 4 PIN 3 PIN 2 PIN 1 2 4 6 1 3 5 EXT LOUDSPEAKER 27772 2 5 ELECTRICAL CONNECTIONS PAGE 2 6 NMEA Interface Antennaterminal Connector for Power Supply Connector for Handset Connector for Printer Connector for VHF Radiotelephone Connector for PC Remote Distress Unit C2149 501224 ...

Страница 28: ...IN 2 PIN 1 4 3 2 1 7 6 5 9 10 11 8 13 12 23 24 22 21 25 19 20 18 17 15 14 16 D4 D6 PE ACKN PIN 10 PIN 12 PIN 11 PIN 13 BUSY SELECT GND PIN 24 PIN 25 PIN 23 GND GND GND GND PIN 14 PIN 15 PIN 16 PIN 17 PIN 18 PIN 19 PIN 21 PIN 20 PIN 22 AUT FEED ERROR INIT SLCT IN GND GND GND 27775 P2 CONNECTOR FOR VHF 12V FROM VHF DISTRESS BUS INTERRUPT KEY MIC TX AF MIC GND GND TELEPHONE PIN 9 PIN 7 PIN 8 PIN 6 PI...

Страница 29: ...ODULE 1 3 6 3 6 2 ADJUSTMENT OF MICROPROCESSOR MODULE 2 3 7 3 6 3 ADJUSTMENT OF RECEIVER MODULE 3 3 8 3 7 REPLACEMENT OF COMPONENTS 3 9 3 8 REPLACEMENT OF MODULES 3 9 3 9 NECESSARY ADJUSTMENTS AND CHECK AFTER REPAIR 3 10 3 9 1 REPAIR REPLACEMENT OF INTERFACE MODULE MODULE 1 3 10 3 9 2 REPAIR REPLACEMENT OF MICROPROCESSOR MODULE MODULE 2 3 10 3 9 3 REPAIR REPLACEMENT OF RECEIVER MODULE MODULE 3 3 1...

Страница 30: ......

Страница 31: ...h the RM2042 has been turned off The capacitance of the battery is 180 mAh milli Ampere hours and as the real time clock only consumes a current of about 7µA the battery should last for a period of at least 2 5 years However in practice this period will be longer because the battery is only used when the RM2042 is turned off The battery is located at the microprocessor module 2 and is soldered to ...

Страница 32: ...ty 100 mV RMS Input Impedance 1 Mohm 30 pF E g Philips type PM 6674 RF SIGNAL GENERATOR Frequency Range 155 MHz 165 MHz Output Level 124dBm 7dBm EMF 0 25 µVRMS 1 VRMS Output Impedance 50 ohm Type of Modulation FM Modulation Frequency External 1 3kHz 2 1kHz Internal 1kHz E g Rohde Schwarz CMT RF MODULATION METER Frequency Range 155 MHz 165 MHz Input Impedance 50 ohm E g Rohde Schwarz CMT LF SIGNAL ...

Страница 33: ...all to your self which is done in the CALL menu by keying in the MID number of the unit it self The DSC call is now generated by the microprocessor and the FSK encoder at the receiver module The FSK signal is then modulating the connected VHF radiotelephone and a short piece of wire connected to the antenna terminal at the VHF will be sufficient to transfer the RF signal to the channel 70 receiver...

Страница 34: ...it is necessary to change the operation mode of the RM2042 from user to service mode This change of operation mode is only allowed for trained technicians and the information of how to do it is therefore only included in the DSC VHF INSTALLATION GUIDE 1 Select the balanced TX AF amplifier as interface to the RF signal generator by turning the switch S1 1 at the interface module into the position E...

Страница 35: ...ontrolled by checking that the peak diviation of the transmitted RF signal is correct NOTE To perform this test it is necessary to change the operation mode of both the RM2042 and the VHF tranceiver from user to service mode This change of operation mode is only allowed for trained technicians and the information of how to do it is therefore only included in the DSC VHF INSTALLATION GUIDE 1 Connec...

Страница 36: ...X AF output is delivered as an unbalanced signal adjusted in level to give a modulation index of 2 measured at the transmitter output During the adjustment the RM2042 must be connected to the same VHF tranceiver as it is going to be installed with This demand is motivated by the fact that the microphone input sensitivity may vary from one tranceiver to an other The unbalanced signal is amplified b...

Страница 37: ...e is only allowed for trained technicians and the information of how to do it is therefore only included in the DSC VHF INSTALLATION GUIDE 1 Repeat point 1 5 in the previous adjustment procedure 2 Turn the switch S1 1 into the position E 3 Start the transmission of a mark signal by pressing FUNC and selecting Test and mark in the display 4 Adjust R17 until the peak frequency diviation is 2600 Hz 1...

Страница 38: ...four adjustable coils and the mixer includes two adjustable transformers All components are adjusted to maximum meter deflection at the field stregth meter output and the mixer output transformer TR2 3 is afterwards adjusted to minimum distortion 1 Apply an unmodulated carrier with the frequncy 156 525 MHz to the antenna terminal and adjust the output level to 80 dBm EMF 33 dB µV 2 Connect a multi...

Страница 39: ...quncy 156 525 MHz to the antenna terminal at the connected VHF tranceiver and adjust the output level of the RF signal generator to 126 dBm EMF 13 dB µV 3 Connect a multimeter or an oscilloscope to the output of the voltage comparator pin 13 at U4 4 3 for measuring the DC voltage 4 Turn the trimpot R93 3 counter clockwise until the output goes high 5 Increase the RF input level to 125 dBm EMF 12 d...

Страница 40: ...F tranceiver REPAIR IN PRINTER INTERFACE MODULE 1 Press the FUNC button and select the Print menu by pressing NEXT Use the up arrow or down arrow to select Options setup Start the print procedure by pressing NEXT and control that the options setup parameters are printed correctly REPAIR IN C2149 PC INTERFACE MODULE 1 Connect a GPS receiver to the remote control unit C2149 and connect this unit to ...

Страница 41: ...rm section 3 6 3 ADJUSTMENT OF FIRST LOCAL OSCILLATOR Perform section 3 5 CHECK OF RECEIVER SENSITIVITY REPAIR IN LO2 AND 2nd IF MODULE 3 Perform section 3 6 3 ADJUSTMENT OF SECOND LOCAL OSCILLATOR Perform section 3 6 3 ADJUSTMENT OF AF OUTPUT LEVEL Perform section 3 5 CHECK OF RECEIVER SENSITIVITY REPAIR IN AF FILTERS MODULE 3 Perform section 3 5 CHECK OF RX AF FILTER RESPONSE Perform section 3 5...

Страница 42: ...IODE TRANSISTOR 7805 TO 220 CASE input VOLTAGE REGULATOR and CONVERTER output GND input GND output 78M05 DPAK PACKAGE GND output input 1 2 3 4 GND input output 78L05 SO 8 PACKAGE OUTPUT COMMON COMMON NC COMMON COMMON INPUT NC 1 2 3 4 5 6 7 8 8 7 6 5 4 3 2 1 LP2951 SO 8 PACKAGE LTC1044 SO 8 PACKAGE OUTPUT SENSE SHUTDOWN GND ERROR 5V TAP INPUT FEED BACK 1 2 3 4 5 6 7 8 OSC LV VDD VD BOOST CAP GND CA...

Страница 43: ...ND INPUT 3 INPUT 3 INPUT 4 14 1 2 LM339 SO 8 PACKAGE 7 6 5 4 3 2 1 1 2 3 4 5 6 7 3 4 NC OUTPUT 2 GROUND OUTPUT 1 NC GROUND INPUT VDD 1 2 3 4 5 6 7 8 1 GND VDD 6 2 3 5 8 INPUT GROUND OUTPUT 2 OUTPUT 1 1 2 3 4 5 6 7 10 11 12 13 14 15 16 MC3372 SO 16 CASE 9 8 Oscillator Mixer Squelch Trigger with Hysteresis Demodulator 10pF 53k AF Amp Filter Amp Limiter Amp MSM6927 24 LEAD FLAT PACK SQUELCH FILTER OU...

Страница 44: ...4 5 67 66 65 68 1 2 64 61 62 63 DTACK BG BGACK BR VCC CLK GND GND NC HALT RESET E VPA IPL2 IPL1 VMA BERR A10 A7 A12 A11 A9 A8 A6 A5 A4 A3 A2 A1 NC FC0 FC1 FC2 PL0 D10 D11 D12 D4 D3 D5 D6 D9 D8 D7 D0 D1 D2 AS UDS R W LDS TOP VIEW MSM5165 OKI HM6264 HITACHI 28 LEAD FLAT PACK 27PC512 28 LEAD PLCC PACKAGE 13 A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 A13 A14 E PWR DWN A12 A15 30 2 31 3 27 24 28 29 4 5 6 7 8 9...

Страница 45: ...3 SERVICE RM2042 28C64A 32 LEAD PLCC PACKAGE 71051 NEC 82C51 OTHERS 28 LEAD PLCC PACKAGE 71054 NEC 82C54 OTHERS 28 LEAD PLCC PACKAGE PAGE 3 15 9403 ...

Страница 46: ...3 SERVICE RM2042 71055 NEC 82C55 OTHERS 44 LEAD PLCC PACKAGE 8573A 28 LEAD PLCC PACKAGE AD232 SO 16L PACKAGE PAGE 3 16 9403 ...

Страница 47: ...8 PACKAGE 74HC00 SO 14 PACKAGE 8 7 6 5 4 3 2 1 74HC02 SO 14 PACKAGE 74HC04 SO 14 PACKAGE 74HC05 SO 14 PACKAGE 74HC08 SO 14 PACKAGE 74HC14 SO 14 PACKAGE 74HC21 SO 14 PACKAGE 74HC32 SO 14 PACKAGE 74HC74 SO 14 PACKAGE PAGE 3 17 9403 ...

Страница 48: ...3 SERVICE RM2042 74HC132 SO 14 PACKAGE 74HC138 SO 16 PACKAGE 74HC148 SO 16 PACKAGE 74HC74 SO 14 PACKAGE 74HC32 SO 14 PACKAGE PAGE 3 18 9403 ...

Страница 49: ...3 SERVICE RM2042 74HC154 SO 24L PACKAGE 74HC174 SO 16 PACKAGE 74HC393 SO 14 PACKAGE 74HC4053 SO 16PACKAGE 74HC4040 SO 16 PACKAGE PAGE 3 19 9403 ...

Страница 50: ......

Страница 51: ...RM2042 CONTENTS 4 MECHANICAL DESCRIPTION 4 1 MECHANICAL DISASSEMBLING AND UNITS LOCATION 4 1 9716 ...

Страница 52: ......

Страница 53: ...tput level adjustment Unbalanced AF output level adjustment Key information switch DSC AF output selection switch Screw for Microprocessor module Cable for Display module Remove indicated cable and screws for removal of Micro processor module and draw the module gently toward the front Clock backup battery Switch for mode select 727499 727498 501225 501226 501227 501229 501232 501236 RM2042 PAGE 4...

Страница 54: ......

Страница 55: ...HEMATIC DIAGRAMS 5 1 INTERFACE MODULE 1 PART NO 626941 5 1 5 2 MICROPROCESSOR MODULE 2 PART NO 626942 5 7 5 3 RECEIVER MODULE 3 PART NO 626943 5 13 5 4 DISPLAY UNIT MODULE 4 PART NO 626944 5 23 5 6 KEYBOARD UNIT MODULE 6 PART NO 625636 5 27 9716 ...

Страница 56: ......

Страница 57: ... at the same time is grounding the signal and removing the bias for the buffer transistor Q8 The controle signal to transistor Q3 is generated by the printer interface unit U10 and is filtered by R13 R14 and C52 to avoid a suddenly change in the bias of transistor Q8 which else would result in an irritating DC blop in the loudspeaker BALANCED TX AF AMPLIFIER The VHF DSC RM2042 has two seperate tra...

Страница 58: ...l which is generated by the 10V voltage regulator at the receiver module The microproc essor will then save all data and write an error message to the display If the power supply is completely lost the RM2042 will simply be turned off and when the power supply is re established the RM2042 will be restarted by a power on reset pulse generated at the microproc essor module But if the input power sup...

Страница 59: ... high and the port IC is ready to write another byte to the printer If PC6 is kept low data written to port A is lost because output on PC7 is inhibited and no strobe is generated C2149 PC INTERFACE The C2149 PC interface is a standard RS232C interface implemented with the UART U8 and the RS232 line driver line receiver U11 U11 generates the RS232 signal levels of 9V from the single 5V supply The ...

Страница 60: ... 4 COMPONENT LOCATION INTERFACE MODULE 1 Seen from component side with upper side tracks Seen from soldering side with lower side tracks PCB rev 26941F 9341 5 CIRCUIT DESCRIPTION AND SCHEMATIC DIAGRAMS RM2042 ...

Страница 61: ...5 CIRCUIT DESCRIPTION AND SCHEMATIC DIAGRAMS RM2042 9341 PAGE 5 5 INTERFACE MODULE 1 This diagram is valid for PCB rev 26941F ...

Страница 62: ...5 CIRCUIT DESCRIPTION AND SCHEMATIC DIAGRAMS RM2042 PAGE 5 6 9341 ...

Страница 63: ...and peripheral devices do not have an acknowledge signal The DTACK is instead generated by the binary counter U14 controlled by the 8 MHz clock and the upper and lower data strobes UDS and LDS on the microprocessor When U14 CT1 is used as output the microprocessor inserts 1 wait state in each read write cycle This means that the maximum access time for the memory chips and peripheral devices are 2...

Страница 64: ... The non volatile memory is used for storing identification numbers setup quick call numbers station register and received distress messages PROGRAMMABLE TIMERS U27 contains 3 programmable 16 bit timers These timers are used to interrupt and hereby control the real time operation of the microprocessor OUT0 interrupts with an interval of approx 13 ms This timer is however under continuous software ...

Страница 65: ...generates after delay of 2Us a 4Us logic low strobe pulse to the printer STROBE LPT MODEM COMMUNICATION INTERFACE The modem communication interface U26 is a syncronus 1200 baud receiver transmitter The receiver is controlled by a an external SYNC signal and a syncronus sampling clock The SYNC signal is the MODULATION DETECT signal from the channel 70 receiver When this signal goes high and the fir...

Страница 66: ... LOCATION MICROPROCESSOR MODULE 2 Seen from component side with upper side tracks Seen from component side with lower side tracks PCB rev 26942L PAGE 5 10 9716 5 CIRCUIT DESCRIPTION AND SCHEMATIC DIAGRAMS RM2042 ...

Страница 67: ...5 CIRCUIT DESCRIPTION AND SCHEMATIC DIAGRAMS RM2042 MICROPROCESSOR MODULE 2 This diagram is valid for PCB rev 26942L 9505 PAGE 5 11 ...

Страница 68: ...5 CIRCUIT DESCRIPTION AND SCHEMATIC DIAGRAMS RM2042 PAGE 5 12 9341 ...

Страница 69: ...nance circuits is tuned by the two adjustable coils L1 and L2 and has a total bandwidth of about 10 MHz The two diodes D1 and D2 is located in the second section of the input bandpass filter to protect the RF amplifier from damage by high voltages The configuration of the intermediate filter at the output of the RF amplifier is identical to the input bandpass filter The intermediate filter is tune...

Страница 70: ...s of the crystal filter FL1 at the 1st IF and the ceramic filter FL2 at the 2nd IF The input and output of the crystal filter is impedance matched to 3k which is obtained by means of the resistors R13 R14 R15 and R16 From the 1st mixer the signal is led through the crystal filter to the input of the 2nd IF buffer amplifier This amplifier is build up around the dual gate MOSFET transistor Q4 which ...

Страница 71: ... FSK decoder The FSK decoder consist of receive filter FSK demodulator and AF signal detect circuit The receive filter is a 12th order band pass filter with a lower cutoff frequency at 600 Hz and an upper cutoff frequency at 2700 Hz which gives a bandwidth of 2 1 kHz The AF signal detect circuit consist of an AC to DC converter that produce a DC voltage proportional to the input signal level This ...

Страница 72: ...RRIER DETECT VHF CARRIER DETECT and MODULATION DETECT signals Build in Channel 70 Receiver U6 decoder FSK encoder FSK U2 carrier detect VHF Connected External Radiotelephone Rx Tx XD Tx data RSI Request to send RD Rx data CD1 AF Signal detect U9 3 U9 2 Modulation detect U5 2 U5 1 VHF Carrier detect Channel 70 Carrier detect de emphasis filter filters Rx AF Tx AF filter VHF U7 4 U7 3 U9 1 U9 4 B A ...

Страница 73: ...ator will be large enough to keep the output low But if a carrier is received the output noise from the FM detector will be reduced and the comparator output will change to logical high VHF CARRIER DETECT The VHF carrier detect circuit is used to detect whether a carrier signal is received by the external connected VHF radiotelephone This information is required to control the termination of a rad...

Страница 74: ... detected at CH70 receiver 1 1 0 1 and carrier detected at ext VHF AF signal detected from CH70 receiver Carrier detected at CH70 receiver 1 1 1 0 and no carrier detected at ext VHF No AF signal detected from CH70 receiver 5V SUPPLY The 5V supply is generated from the battery voltage by the series voltage regulator U11 This regulator is of the type 78L05AC which is able to deliver a current of abo...

Страница 75: ...5 CIRCUIT DESCRIPTION AND SCHEMATIC DIAGRAMS RM2042 PAGE 5 19 9341 ...

Страница 76: ... 20 COMPONENT LOCATION RECEIVER MODULE 3 Seen from component side with upper side tracks Seen from component side with lower side tracks PCB rev 26943E 9716 5 CIRCUIT DESCRIPTION AND SCHEMATIC DIAGRAMS RM2042 ...

Страница 77: ...5 CIRCUIT DESCRIPTION AND SCHEMATIC DIAGRAMS RM2042 9716 PAGE 5 21 RECEIVER MODULE 3 This diagram is valid for PCB rev 26943E ...

Страница 78: ...5 CIRCUIT DESCRIPTION AND SCHEMATIC DIAGRAMS RM2042 PAGE 5 22 9341 ...

Страница 79: ...tput pins Q1 Q2 Q3 and Q4 are connected through one of the resistors R6 R8 R9 and R10 to the inverting input of U2 1 The output voltage from the D A converter i e output at U2 1 is divided by 2 by means of two resistors R16 and R18 and is then led to the non inverting input at the amplifier U2 4 The inverting input at this amplifier is connected to a resistor network which include the NTC resistor...

Страница 80: ...T DESCRIPTION AND SCHEMATIC DIAGRAMS RM2042 COMPONENT LOCATION DISPLAY UNIT MODULE 4 Seen from component side with upper side tracks Seen from component side with lower side tracks PCB rev 26944F PAGE 5 24 9739 ...

Страница 81: ...5 CIRCUIT DESCRIPTION AND SCHEMATIC DIAGRAMS RM2042 9915 PAGE 5 25 DISPLAY UNIT MODULE 4 This diagram is valid for PCB rev 26944F ...

Страница 82: ...5 CIRCUIT DESCRIPTION AND SCHEMATIC DIAGRAMS RM2042 PAGE 5 26 9341 ...

Страница 83: ...ely and by reading the output at the 8 columns it is possible to determine which key has been activated This scanning of the keyboard takes place 100 times per second The keyboard can be illuminated by 13 LED s The voltage accross the LED s is controlled by the two transistors Q2 and Q3 placed at the microprocessor module 2 and the current in each LED is roughly 8 5 mA This diagram is valid for PC...

Страница 84: ......

Страница 85: ...RM2042 CONTENTS 6 MICROTELEPHONE INSTALLATION 6 1 SPECIAL INSTALLATION WITH 2 MICROTELEPHONES 6 3 6 2 SPECIAL INSTALLATION WITH 3 MICROTELEPHONES 6 4 6 3 MECHANICAL DIMENSIONS FOR HANDSET 6 5 9716 ...

Страница 86: ......

Страница 87: ...ELLOW MIC PRE AMP MC1701 6 1 4 2 5 3 MC1 R1 1k8 C1 100u 10n C2 D1 1N4148 8k2 R3 R5 2k7 2k2 R7 R9 2k7 R10 120k R2 1k8 C3 10u u47 C4 R4 18k MIC PRE AMPLIFIER 100 33u C10 39k R11 4k7 R6 C5 2u2 2u2 C6 R8 6k8 C9 1n 10u C7 1n C8 C11 10n 390 10 18v For TEST 4 0 24025E In orange marked microtelephone cartridge R2 is changed from 1k8 to 5k6 ohm 10mV DIV OV 0 5msec DIV 0 5msec DIV OV 10mV DIV T3 BC547C BC54...

Страница 88: ...10 N750 500VDC KCK RT HM60 SK UJ 270 K 16 062 C14 CAPACITOR CERAM SMD 0805 15pF 5 NPO 50VDC MURATA GRM40 COG 150 J 50 PT 323 076 D1 DIODE 1N4148 HIGH SPEED PHILIPS 1N4148 143 25 131 MC1 MICROPHONE ELECTRET 9 7 x 6 7mm PANASONIC WM 0344BY 46 012 R1 RESISTOR MF 1k8 OHM 5 0 33W PHILIPS 2322 187 73182 02 478 R2 RESISTOR MF 1k8 OHM 5 0 33W PHILIPS 2322 187 73182 02 478 R3 RESISTOR MF 8k2 OHM 5 0 33W PH...

Страница 89: ... 4 2 5 3 7 RED YELLOW WHITE BROWN BLUE YELLOW J2 H2087 7 3 5 2 4 1 6 MICROTELEPHONE H2087 CONNECTOR CONNECTOR H2086 MICROTELEPHONE The cable between the Hooks is not factory delivered 7 x 0 14 mm S1 2 3 is shown with microtelephone in Hook Recommended cable lenght max 20 meters be seperated Yellow wire on Pin 2 and white wire in P7 the modulations the ground wires white and yellow in P3 must RED Y...

Страница 90: ...LEPHONE HANDSET 2 HOOK 2 3 The cable between the Hooks is not factory delivered 7 x 0 14 mm RED YELLOW WHITE BLUE BROWN 6 1 2 7 8 3 4 9 5 J2 BROWN RED WHITE BLUE WHITE BLUE BROWN YELLOW RED MC MIC PRE AMP TC HAND KEY 2 J3 5 9 4 3 8 7 2 1 6 BLUE BLACK BLUE GREEN S2 BLUE BROWN WHITE YELLOW RED 5 0 24281 B Connection Board 1 7 6 5 4 3 2 1 BROWN BLUE WHITE YELLOW RED 6 1 2 7 8 3 4 9 5 P3 P4 5 9 4 3 8 ...

Страница 91: ...TALLATION RM2042 9440 6 3 MECHANICAL DIMENSIONS FOR HANDSET ø4 5 ø4 5 65 43 80 80 32 32 64 151 275 81 43 27946 MECHANICAL DIMENSIONS FOR HANDSET HOLDER WITH MICROSWITCH ø4 5 ø4 5 65 43 80 80 32 32 103 64 151 275 43 26999 PAGE 6 5 ...

Страница 92: ...LATION RM2042 9440 ø4 5 ø4 5 65 43 80 80 32 32 43 4 0 29937 275 64 151 103 ø4 5 65 80 80 32 32 4 0 29938 275 78 132 62 ø4 5 MECHANICAL DIMENSIONS FOR HANDSET MECHANICAL DIMENSIONS FOR HANDSET HOLDER WITH MICROSWITCH PAGE 6 6 ...

Страница 93: ...RM2042 CONTENTS 7 PARTS LIST 9716 ...

Страница 94: ......

Страница 95: ...24 C10 1 CAPACITOR CERAM SMD 0805 100nF 10 X7R 25VDC MURATA GRM40 X7R 104 K 25 PT 328 348 C11 1 CAPACITOR ELECTROLYTIC SM 10uF 20 16VDC EUROPE CHEMICON Al Chip MKV 16V 10 M 333 079 C12 1 CAPACITOR CERAM SMD 0805 100nF 10 X7R 25VDC MURATA GRM40 X7R 104 K 25 PT 328 348 C13 1 CAPACITOR CERAM SMD 0805 100nF 10 X7R 25VDC MURATA GRM40 X7R 104 K 25 PT 328 348 C14 1 CAPACITOR CERAM SMD 0805 10nF 10 X7R 50...

Страница 96: ...340 032 D8 1 DIODE SMALL SIGNAL SOD 80 BAS32L PHILIPS BAS32L 340 032 F1 1 FUSE 2AF 5x20mm LITTELFUSE 217002 45 556 FP1 1 EMI FERRITE BEAD 4 5x1 6x1 6mm 0 5A MURATA BLM 41 A 800 S PT 370 031 FP2 1 EMI FERRITE BEAD 4 5x1 6x1 6mm 0 5A MURATA BLM 41 A 800 S PT 370 031 J1 1 SOCKET SUB D 9 POLES PCB VERSION 2x 4 40 NUT EDA INC 8TO 009SS 244T 144T 344T 78 164 J2 1 SOCKET BNC PCB VERSION ROSENBERGER 51K10...

Страница 97: ...HM MCR 10 EZH J 472 302 056 R57 1 RESISTOR SMD 0805 4k7 OHM 5 0 1W ROHM MCR 10 EZH J 472 302 056 R58 1 RESISTOR SMD 0805 100k OHM 5 0 1W ROHM MCR 10 EZH J 104 302 072 R59 1 RESISTOR SMD 0805 100 OHM 5 0 1W ROHM MCR 10 EZH J 101 302 036 R60 1 RESISTOR SMD 0805 47k OHM 5 0 1W ROHM MCR 10 EZH J 473 302 068 R61 1 RESISTOR SMD 0805 47k OHM 5 0 1W ROHM MCR 10 EZH J 473 302 068 R62 1 RESISTOR SMD 0805 1k...

Страница 98: ...7R104K25PT 328 348 C5 2 CAPACITORCERAM SMD0805 100nF10 X7R25VDC MURATA GRM40X7R104K25PT 328 348 C6 2 CAPACITORCERAM SMD0805 100nF10 X7R25VDC MURATA GRM40X7R104K25PT 328 348 C7 2 CAPACITORCERAM SMD0805 100nF10 X7R25VDC MURATA GRM40X7R104K25PT 328 348 C8 2 CAPACITORCERAM SMD0805 100nF10 X7R25VDC MURATA GRM40X7R104K25PT 328 348 C9 2 CAPACITORCERAM SMD0805 100nF10 X7R25VDC MURATA GRM40X7R104K25PT 328 ...

Страница 99: ...M 31 B 601 S PT 370 021 FP13 2 EMI FERRITE BEAD 3 2x1 6x1 6mm 0 2A MURATA BLM 31 B 601 S PT 370 021 FP14 2 EMI FERRITE BEAD 3 2x1 6x1 6mm 0 2A MURATA BLM 31 B 601 S PT 370 021 FP15 2 EMI FERRITE BEAD 3 2x1 6x1 6mm 0 2A MURATA BLM 31 B 601 S PT 370 021 FP16 2 EMI FERRITE BEAD 3 2x1 6x1 6mm 0 2A MURATA BLM 31 B 601 S PT 370 021 FP17 2 EMI FERRITE BEAD 3 2x1 6x1 6mm 0 2A MURATA BLM 31 B 601 S PT 370 ...

Страница 100: ...TED CIRCUIT 74HC32D TEXAS SN74HC32DR 355 217 U9 2 INTEGRATED CIRCUIT 74HC32D TEXAS SN74HC32DR 355 217 U10 2 HEX INVERTERS 74HC04 TEXAS SN74HC04D R 355 205 U11 2 INTEGRATED CIRCUIT 74HC21D TEXAS SN74HC21DR 355 214 U12 2 QUAD 2 INPUT NAND GATES 74HC00 TEXAS SN74HC00DR TAPE REEL 355 200 U13 2 INTEGRATED CIRCUIT 74HC08D TEXAS SN74HC08DR TAPE REEL 355 208 U14 2 INTEGRATED CIRCUIT 74HC393D TEXAS SN74HC3...

Страница 101: ...ROPE CHEMICON Al Chip MKV 16V 10 M 333 079 C42 3 CAPACITOR CERAM SMD 0805 100nF 10 X7R 25VDC MURATA GRM40 X7R 104 K 25 PT 328 348 C43 3 CAPACITOR CERAM SMD 0805 22nF 10 X7R 50VDC MURATA GRM40 X7R 223 K 50 PT 328 340 C44 3 CAPACITOR CERAM SMD 1206 3n9F 5 NPO 50VDC MURATA GRM42 6COG392J 50PT 324 105 C45 3 CAPACITOR CERAM SMD 1206 3n9F 5 NPO 50VDC MURATA GRM42 6COG392J 50PT 324 105 C46 3 CAPACITOR CE...

Страница 102: ... T NiBa 323 084 C115 3 CAPACITOR CERAM SMD 0805 330pF 5 NPO 50VDC TDK C2012 COG 1H 331 J T NiBa 323 092 C116 3 CAPACITOR ELECTROLYTIC SM 3u3F 20 50VDC EUROPE CHEMICON Al Chip MKV 50V 3u3 M 333 073 C117 3 CAPACITOR ELECTROLYTIC SM 3u3F 20 50VDC EUROPE CHEMICON Al Chip MKV 50V 3u3 M 333 073 C118 3 CAPACITOR ELECTROLYTIC SM 3u3F 20 50VDC EUROPE CHEMICON Al Chip MKV 50V 3u3 M 333 073 C119 3 CAPACITOR ...

Страница 103: ...R SMD 0805 27k OHM 5 0 1W ROHM MCR 10 EZH J 273 302 065 R40 3 RESISTOR SMD 0805 27k OHM 5 0 1W ROHM MCR 10 EZH J 273 302 065 R41 3 RESISTOR SMD 0805 47k OHM 5 0 1W ROHM MCR 10 EZH J 473 302 068 R42 3 RESISTOR SMD 0805 10k OHM 5 0 1W ROHM MCR 10 EZH J 103 302 060 R43 3 RESISTOR SMD 0805 10k OHM 5 0 1W ROHM MCR 10 EZH J 103 302 060 R44 3 RESISTOR SMD 0805 100k OHM 5 0 1W ROHM MCR 10 EZH J 104 302 07...

Страница 104: ...k0 OHM 5 0 1W ROHM MCR 10 EZH J 102 302 048 R114 3 RESISTOR SMD 0805 10k OHM 5 0 1W ROHM MCR 10 EZH J 103 302 060 R115 3 RESISTOR SMD 0805 10k OHM 5 0 1W ROHM MCR 10 EZH J 103 302 060 R116 3 RESISTOR SMD 0805 10k OHM 5 0 1W ROHM MCR 10 EZH J 103 302 060 R117 3 RESISTOR SMD 0805 10k OHM 5 0 1W ROHM MCR 10 EZH J 103 302 060 R118 3 RESISTOR SMD 0805 100k OHM 5 0 1W ROHM MCR 10 EZH J 104 302 072 R119 ...

Страница 105: ... 10 EZH J 473 302 068 R16 RESISTOR SMD 0805 47k OHM 5 0 1W ROHM MCR 10 EZH J 473 302 068 R17 RESISTOR SMD 0805 4k53 OHM 1 50mW PHILIPS 2322 734 2 64532 302 433 R18 RESISTOR SMD 0805 47k OHM 5 0 1W ROHM MCR 10 EZH J 473 302 068 R19 RESISTOR SMD 0805 47k OHM 5 0 1W ROHM MCR 10 EZH J 473 302 068 R20 RESISTOR SMD 0805 120k OHM 5 0 1W ROHM MCR 10 EZH J 124 302 073 R21 RESISTOR SMD 0805 36k5 OHM 1 50mW ...

Страница 106: ...4005 43 601 S8 6 SWITCH KEYBOARD 12x12mm OMRON B3F 4005 43 601 S9 6 SWITCH KEYBOARD 12x12mm OMRON B3F 4005 43 601 S10 6 SWITCH KEYBOARD 12x12mm OMRON B3F 4005 43 601 S11 6 SWITCH KEYBOARD 12x12mm OMRON B3F 4005 43 601 S12 6 SWITCH KEYBOARD 12x12mm OMRON B3F 4005 43 601 S13 6 SWITCH KEYBOARD 12x12mm OMRON B3F 4005 43 601 S14 6 SWITCH KEYBOARD 12x12mm OMRON B3F 4005 43 601 S15 6 SWITCH KEYBOARD 12x1...

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