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Maintenance Manual

M-RK

UHF
PERSONAL TWO-WAY FM
RADIO COMBINATION

LBI-38735A

TABLE OF CONTENTS

Service Assemblies ...................................................................LBI-38746
Service Section .........................................................................LBI-38740
Disassembly and Assembly ......................................................LBI-38741

ericssonz

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Summary of Contents for M-RK

Page 1: ...Maintenance Manual M RK UHF PERSONAL TWO WAY FM RADIO COMBINATION LBI 38735A TABLE OF CONTENTS Service Assemblies LBI 38746 Service Section LBI 38740 Disassembly and Assembly LBI 38741 ericssonz...

Page 2: ...by Ericsson Inc Unpublished rights are reserved under the copyright laws of the United States This manual is published by Ericsson Inc without any warranty Improvements and changes to this manual nec...

Page 3: ...er Discriminator U11 9 Synthesizer Circuit 9 Phase Lock Loop Module U2 9 Voltage Controlled Oscillator U5 10 VCTCXO Reference Oscillator Z1 10 LOGIC CIRCUIT 10 Control Board Assy 10 Microcomputer 10 F...

Page 4: ...zer Circuit 15 PREVENTIVE MAINTENANCE 15 Antenna 16 Mechanical Inspection 16 Alignment 16 Frequency Check 16 DISASSEMBLY 16 REPLACEMENT 16 TROUBLESHOOTING PROCEDURE 16 WEATHERPROOF INTEGRITY 16 DIAGRA...

Page 5: ...Deviation 5 kHz FM Hum Noise 45 dB Audio Distortion 3 60 Modulation Frequency Stability 5 ppm 30 C to 60 C RF Load Impedance 50 ohms Microphone Sensitivity Less than 90 dB SPL EIA 60 MDD Maximum Attac...

Page 6: ...ion the radio will not transmit while in the receive mode Automatic Power Levels The desired power level on each channel can be programmed into the radio personality Power level is automatically selec...

Page 7: ...with display processor rotary switch AF volume with switch d A battery pack that fits the M RK main unit e Lightweight plastic front and back housing RADIO ASSEMBLY TRANSMIT CIRCUIT The transmit circu...

Page 8: ...circuits c Digital Signal Processor DSP Includes a modem address decoder and clock control circuit d LED Flex Assembly M RK I Includes LED dis play rotary switch and AF volume with on off switch e LC...

Page 9: ...crystal filter FL304 Second IF Amplifier Discriminator U11 The Second IF Amplifier Discriminator circuit Figure 10 contains FM IF IC U11 TA31132F and 455 kHz ce ramic filter FL305 FL306 FL307 The FM...

Page 10: ...ates U15 CMOS SRAM U5 Audio Amplifier U11 5 volt Regulator U9 10 Microcomputer The main microcomputer circuit in this radio consists of microprocessor HD6475328FI1O U2 2 Kx8E2 PROM U6 128 K x 8 flash...

Page 11: ...Figure 3 Radio Block Diagram VHF UHF Figure 4 M RK I Logic Block Diagram LBI 38735 11...

Page 12: ...Figure 5 M RK II Scan Logic Block Diagram Figure 6 Power Amplifier PA UHF Figure 7 LPF DC T R SW Module U8 VHF UHF LBI 38735 12...

Page 13: ...Figure 8 RF Amplifier Mixer Figure 9 First IF Amplifier Figure 10 Second IF Amplifier Discriminator LBI 38735 13...

Page 14: ...p IC accommo dating almost all the audio functions The audio functions are under control of the microcomputer in compliance with the function of the radio unit The functions of the audio proces sor ar...

Page 15: ...te audio circuits to provide proper radio accessory operation The UDC voltage is set by the resistor within the UDC MAINTENANCE This Maintenance section provides information on ad justment of the radi...

Page 16: ...LPF DC T R SW VCO Voltage Controlled Oscilla tor and the VCTCXO Reference Oscillator These are very reliable devices and will not normally need to be re placed Before replacing any of these modules al...

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