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Motorola GM-950 Manual
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Motorola GM-950 Manual

Motorola GM-950 Manual

Control heads/control microphones specific information
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See also: User Manual , Manual
Control Heads/Control Microphones
Chapter
4A
Control Head for Radio Model N2 ........................................................ 4A.1-i
4B
Control Head for Radio Model N3......................................................... 4B.1-i
4C
Hand Held Control Microphone GMN6151 ........................................... 4C.1-i
4D
Control Head for Radio Model N4......................................................... 4D.1-i
Control Heads/Control Microphones Specific Information
Chapter 4
Specific Information
Table of Contents
Table of Contents
Page
4-i

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Summary of Contents for Motorola GM-950

  • Page 1 Table of Contents Chapter 4 Control Heads/Control Microphones Specific Information Table of Contents Chapter Page Control Head for Radio Model N2 ............4A.1-i Control Head for Radio Model N3............4B.1-i Hand Held Control Microphone GMN6151 ........... 4C.1-i Control Head for Radio Model N4............4D.1-i Control Heads/Control Microphones Specific Information...
  • Page 2 Table of Contents 4-ii Control Heads/Control Microphones Specific Information...
  • Page 3 Table of Contents Chapter 4D Control Head for Radio Model N4 Table of Contents Chapter 4D.1 Introduction/Theory of Operation 4D.2 PCB/Schematic Diagram and Parts List Control Head for Radio Model N4 4D-i...
  • Page 4 Table of Contents 4D-ii Control Head for Radio Model N4...

  • Page 5: Table Of Contents

    Table of Contents Chapter 4D.1 Introduction/Theory of Operation Table of Contents Paragraph Page Overview..................... 1 Exploded View Diagram ................2 Theory of Operation .................. 2 General ......................2 Power Supplies.................... 3 Voltage Regulator Circuit................3 Power On / Off ..................... 3 Microprocessor Circuit .................
  • Page 6 Table of Contents 4D.1-ii Introduction/Theory of Operation...

  • Page 7: Overview

    Overview Overview 4D.1 128 Channel, Radio Model N4 Control Head The features of the N4 radio control head are as follows: On/Off Button Rocker Type Volume Up/Down Control Dot matrix, Backlit LCD display 3 LEDs (Red, Yellow, Green) Up/Down keys for Channel Increment/Decrement 7 Dealer Programmable Option Buttons Clear and Select Buttons Full DTMF keypad...

  • Page 8: Exploded View Diagram

    - numerical information e.g. channel number, select code, call address name. To control the LEDs and the LCD, and to communicate with the host radio, the control head uses the Motorola 68HC11E9 or 68HC11E20 (dependent on the used character set) microprocessor.

  • Page 9: Power Supplies

    Theory of Operation Power Supplies The power supply to the control head is taken from the host radio FLT A+ voltage via connector J0901 pin 2. The voltage FLT A+ is at battery level and is used for the LEDs, the back light, to power up the radio via On / Off button and to supply the voltage regulator circuit.

  • Page 10: Microprocessor Circuit

    Theory of Operation Microprocessor Circuit The control head uses the Motorola 68HC11E9 or 68HC11E20 (dependent on the used character set) microprocessor (µP) (U0901) to control the LEDs, the LCD and to communicate with the host radio. RAM and ROM are contained within the microprocessor itself.

  • Page 11: Keypad Keys

    Theory of Operation When the host radio needs to communicate to the control head µP it brings the control head select line (CNTL HD CE) to a logic ‘0’ and then sends the proper data and clock signals. After the data has been sent the control head select line is returned to a logic ‘1’.

  • Page 12: Microphone Connector

    Theory of Operation The display driver is fixed on the flex which connects the display to the PC board. The driver contains a data interface to the µP, an LCD segment driver, an LCD power circuit, an oscillator, data RAM and control logic. At power up the driver’s control logic is reset by a logic ‘0’ at input RES (U0902-9).
  • Page 13 Table of Contents Chapter 4D.2 PCB/Schematic Diagram and Parts List Table of Contents Description Page Control Head (N4) - Diagrams and Parts Lists PCB Layout Component Side ..........1 PCB Layout Solder Side .
  • Page 14 Table of Contents 4D.2-ii PCB/Schematic Diagram and Parts List...
  • Page 15 TP0951 R0834 C0947 C0944 TP0953 C0893 VR0933 R0942 R0944 TP0902 R0811 C0953 TP0903 C0955 R0960 C0927 C0925 TP0901 C0928 C0895 R0855 MOTOROLA 1997 8486015B03-T1 R0927 C0892 VR0902 Bottom Side Control Head (N4) PCB No. 8486015B03_T1 Diagrams and Parts List 4D.2-1...
  • Page 16 .1uF NC 51 ANALOG_3 Q0932 R0959 390K TP0954 R0944 PB0931 C0944 .1uF C0936 C0948 ON/OFF 470pF .1uF R0937 4.7K MOTOROLA D0931 FLT_A+ R0945 C0945 .1uF ON_OFF_CONTROL C0949 Graphic Display .1uF C0937 R0938 470pF 4.7K 4.7K 0102725B71 Controlhead T sheet 1...
  • Page 17 Control Head (N4) Schematic Diagram Q0831 FLT_A+ D0801 D0805 D0809 D0813 D0817 D0821 D0825 D0829 R0831 R0801 R0802 R0803 R0804 R0805 R0806 R0807 200K 200K 200K 200K 200K 200K 200K 200K 200K 200K 200K 200K 3.3K 3.3K D0802 D0806 D0810 D0814 D0818 D0822...
  • Page 18 Control Head (N4) Schematic Diagram Control Head (N4) Circuit Motorola Circuit Motorola Circuit Motorola Parts List Description Description Description Part No. Part No. Part No. D0882 4805729G73 LED YEL HP R0852 0662057A85 33k 1/16W 5% R0926 0662057A57 2k2 1/16W 5%...

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