Ericsson M-RK Maintenance Manual
  1. Manuals
  2. Brands
  3. Ericsson Manuals
  4. Two-Way Radio
  5. M-RK
  6. Maintenance manual

Ericsson M-RK Maintenance Manual

Vhf personal two-way fm radio combination
Hide thumbs Also See for M-RK:
Table of Contents

Advertisement

Quick Links

Download this manual
Mobile Communications
M-RK
VHF
PERSONAL TWO-WAY FM
RADIO COMBINATION
TABLE OF CONTENTS
Service Assemblies . . . . . . . . . . . . . . . . . . . . . . . . LBI-38746
Service Section . . . . . . . . . . . . . . . . . . . . . . . . . . . LBI-38738
Disassembly and Assembly . . . . . . . . . . . . . . . . . . . . LBI-38741
Maintenance Manual
LBI-38734

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the M-RK and is the answer not in the manual?

Questions and answers

Related Manuals for Ericsson M-RK

Summary of Contents for Ericsson M-RK

  • Page 1 LBI-38734 Mobile Communications M-RK PERSONAL TWO-WAY FM RADIO COMBINATION TABLE OF CONTENTS Service Assemblies ......LBI-38746 Service Section ......LBI-38738 Disassembly and Assembly .

  • Page 2: Table Of Contents

    LCD/KB Flex Assy. (M-RK II) ........

  • Page 3: Specifications

    Figure 1-2 - M-RK II Controls and Accessories ....... .

  • Page 4: Specifications

    LBI-38734 SPECIFICATIONS (Continued) Dimensions (HxWxD)(M-RKII) (with 1200 mAH battery) 176.8x68x40.6 mm (7x2.7x1.6 inches) Weight (M-RKII) 20.3 ounces (with 1200 mAH battery) Operable Temperature Range -30º to +60ºC (-22º to +140ºF) TRANSMIT RF Power Output 0.5 to 6 watts Spurious Emissions -75dBc ±5 KHz Maximum Deviation...

  • Page 5: Description

    A group consists of several users with a common group identification (ID). A radio may have several groups, but the (M-RK II) may be programmed on or off per group. selected group determines who the unit can call at any spe- The side-tone beep, related to the operation of the cific time.

  • Page 6: Radio Assembly

    The transmitter is modulated at both rotary switch, AF volume with switch. the VCO and the VCTCXO. d. A battery pack that fits the M-RK main unit. b. VCTCXO Module -- The VCTCXO is a voltage controlled, temperature compensated crystal oscilla- e.
  • Page 7 LBI-38734 Figure 1-1 - M-RK I Controls and Accessories...

  • Page 8: Figure 1-2 - M-Rk Ii Controls And Accessories

    LBI-38734 Figure 1-2 - M-RK II Controls and Accessories...

  • Page 9: System Analysis

    Receive Circuit SYSTEM ANALYSIS The M-RK receive circuit, as shown in Figure 2, con- Refer to Figures 2 and 3. The M-RK radio consists of sists of the following circuits: three major printed wire boards as follows: • RF Amplifier/Mixer •...
  • Page 10 LBI-38734...
  • Page 11 LBI-38734...
  • Page 12 LBI-38734...

  • Page 13: Figure 4 - Power Amplifier (Pa) Vhf

    LBI-38734 Figure 4 - Power Amplifier (PA) VHF Figure 5 - LPF. DC. T/R SW. Module (U8) VHF/UHF Figure 6 - RF Amplifier/Mixer...

  • Page 14: Second If Amplifier/Discriminator (U11)

    LBI-38734 Figure 7 - First IF Amplifier Second IF Amplifier/Discriminator (UII) Phase-Lock-Loop Module (U2) The Second IF Amplifier/Discriminator circuit (Figure The PLL module U2 contains a reference frequency, di- 8) contains FM IF IC UII (TA31132F) and 455 KHz ce- vider, phase detector, and a programmable divider.

  • Page 15: Logic Circuit

    Physically, this circuit consists of two circuit board as • Custom CMOS DSP Chip (U3) follows: • Control Board Assy. • Custom CMOS ASP Chip (U7) • LED Flex Assy. (M-RK I) • CMOS Inverters (U12) • LCD/KB Flex Assy. (M-RK II) • CMOS OR gates (UIS)

  • Page 16: Microcomputer

    Voltage Regulator (U9, UIO) • Controlling the LED display (M-RK I) Voltage regulator U9, UIO, QI generate 5 VDC for Con- • Loading data to the LCD display processor (M-RK II) trol Board and LCD/KB Flex Board. • Controlling the audio circuit (processor) Audio Amplifier (UII) •...

  • Page 17: Led Flex Assy. (M-Rk I)

    There are 15 button of key switches (keypads) on the Transmit Circuit Alignment System model of M-RK II. The keypads consist of flexible cable and rubber contacts, and each connect through cable to the microcompurter. The transmit circuit is factory turned and should not re- quire any readjustment.

  • Page 18: Synthesizer Circuit

    The M-RK radio is designed to meet MIL-810-D speci- tion. They should be repeated after the first month of opera- fication for Blowing Rain. All access to the M-RK radio are tion, then again one time each year. protected from water entry by suitable gaskets and seals.

Table of Contents