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    							 Professional Radio
    GM Series
    Controller 
    Service Information
    Issue: September 2000 
    						
    							ii
    Computer Software Copyrights
    The Motorola products described in this manual may include copyrighted Motorola computer programs stored 
    in semiconductor memories or other media. Laws in the United States and other countries preserve for 
    Motorola certain exclusive rights for copyrighted computer programs, including the exclusive right to copy or 
    reproduce in any form, the copyrighted computer program. Accordingly, any copyrighted Motorola computer 
    programs contained in the Motorola products described in this manual may not be copied or reproduced in 
    any manner without the express written permission of Motorola. Furthermore, the purchase of Motorola 
    products shall not be deemed to grant, either directly or by implication, estoppel or otherwise, any license 
    under the copyrights, patents or patent applications of Motorola, except for the normal non-exclusive royalty-
    free license to use that arises by operation of law in the sale of a product. 
    						
    							iii
    Table of Contents
    Chapter 1 THEORY OF OPERATION
    1.0 Controller Circuits ................................................................................................ 1-1
    1.1 Overview......................................................................................................... 1-1
    1.2 General ........................................................................................................... 1-1
    1.3 Radio Power Distribution ................................................................................ 1-2
    1.4 Electronic ON/OFF ......................................................................................... 1-3
    1.5 Emergency ..................................................................................................... 1-4
    1.6 Mechanical ON/OFF ....................................................................................... 1-4
    1.7 Ignition ............................................................................................................ 1-5
    1.8 Microprocessor Clock Synthesizer ................................................................. 1-5
    1.9 Serial Peripheral Interface (SPI) ..................................................................... 1-5
    1.10 SBEP Serial Interface ..................................................................................... 1-6
    1.11 General Purpose Input/Output....................................................................... 1-6
    1.12 Normal Microprocessor Operation.................................................................. 1-7
    1.13 FLASH Electronically Erasable Programmable Memory ................................ 1-8
    1.14 Electrically Erasable Programmable Memory (EEPROM) .............................. 1-9
    1.15 Static Random Access Memory (SRAM) ....................................................... 1-9
    1.16 Universal Asynchronous Receiver Transmitter (UART) ................................. 1-9
    2.0 Controller Board Audio and Signalling Circuits .................................................... 1-9
    2.1 General - Audio Signalling Filter IC with Compander ..................................... 1-9
    2.2 Transmit Audio Circuits ................................................................................ 1-10
    2.3 Transmit Signalling Circuits .......................................................................... 1-12
    2.4 Receive Audio Circuits ................................................................................. 1-14
    2.5 Receive Signalling Circuits ........................................................................... 1-17
    2.6 Voice Storage ............................................................................................... 1-18 
    						
    							iv
    Chapter 2 TROUBLESHOOTING CHARTS
    1.0  Controller ............................................................................................................ 2-1
    Chapter 3 CONTROLLER SCHEMATICS
    1.0 Allocation of Schematics and Circuit Boards ....................................................... 3-1
    2.0 T2 Controller  ....................................................................................................... 3-3
    3.0 T5 Controller  ..................................................................................................... 3-10
    4.0 T6/7 Controller  .................................................................................................. 3-19 
    						
    							Chapter 1
    THEORY OF OPERATION
    1.0 Controller Circuits
    1.1 Overview
    This section provides a detailed theory of operation for the radio and its components. The main radio 
    is a single board design, consisting of the transmitter, receiver, and controller circuits. The main 
    board is designed to accept one additional option board. This may provide functions such as secure 
    voice/data, voice storage or signalling decoder.
    A controlhead is either mounted directly or connected by an extension cable. The controlhead 
    contains, LED indicators, a microphone connector, buttons and dependant of the radio type, a 
    display and a speaker. These provide the user with interface control over the various features of the 
    radio.
    If no controlhead is mounted directly on the front of the radio, an expansion board containing circuitry 
    for special applications can be mounted on the front of the radio. An additional controlhead can be 
    connected by an extension cable.
    In addition to the power cable and antenna cable, an accessory cable can be attached to a connector 
    on the rear of the radio. The accessory cable provides the necessary connections for items such as 
    external speaker, emergency switch, foot operated PTT, and ignition sensing, etc
    1.2 General
    The radio controller consists of 3 main subsections:
    n nDigital Control
    n nAudio Processing
    n nVoltage Regulation.
    The digital control section of the radio is based upon an open architecture controller configuration.It 
    consists of a microprocessor, support memory, support logic, signal MUX ICs, the On/Off circuit, and 
    general purpose Input/Output circuitry.
    The controller uses the Motorola 68HC11FL0 microprocessor (U0101). In addition to the 
    microprocessor, the controller has 3 external memory devices. The 3 memory devices consist of a 
    32Kbyte SRAM (U0122), a 512Kbyte FLASH EEPROM (U0121), and a 16Kbyte EEPROM (U0111).
    Note: From this point on the 68HC11FL0 microprocessor will be referred to as µP. References to a 
    controlhead will be to the controlheads with display. 
    						
    							1-2THEORY OF OPERATION
    Figure 1-1 Controller Block Diagram
    1.3 Radio Power Distribution
    The DC power distribution throughout the radio board is shown in Figure 2-1. Voltage regulation for 
    the controller is provided by 4 separate devices; U0651 (MC78M05) +5V, U0641 (LM2941) +9.3V, 
    U0611 (LM2941) SWB+ limited to 16.5V and VSTBY 5V (a combination of R0621 and VR0621). An 
    additional 5V regulator is located on the RF section.
    The DC voltage applied to connector J0601 supplies power directly to the electronic on/off control, 
    RF power amplifier, 16.5V limiter, 9.3V regulator, Audio PA and 5.6V stabilization circuit. The 9.3V 
    regulator (U0641) supplies power to the 5V regulator (U0651) and the 6V voltage divider Q0681.
    Regulator U0641 is used to generate the 9.3 volts required by some audio circuits, the RF circuitry 
    and power control circuitry. Input and output capacitors (C0641 and C0644 / C0645) are used to 
    reduce high frequency noise. R0642 / R0643 set the output voltage of the regulator. If the voltage at 
    pin 1 is greater than 1.3 volts the regulator output decreases and if the voltage is less than 1.3 volts 
    the regulator output increases. This regulator output is electronically enabled by a 0 volt signal on pin 
    2. Q0661, Q0641 and R0641 are used to disable the regulator when the radio is turned off.
    Voltage regulation providing 5V for the digital circuitry is done by U0651. Operating voltage is from 
    the regulated 9.3V supply. Input and output capacitors (C0651 / C0652 and C0654 / C0655) are 
    used to reduce high frequency noise and provide proper operation during battery transients. Voltage 
    sense device U0652 or alternatively U0653 provides a reset output that goes to 0 volts if the 
    regulator output goes below  4.5 volts. This is used to reset the controller to prevent improper 
    operation. Diode D0651 prevents discharge of C0652 by negative spikes on the 9V3 voltage.
    Transistor Q0681 and resistors R0681 / R0682 divide the regulated 9.3V down to about 6 volts. This 
    voltage supplies the 5V regulator, located on the RF section.  By reducing the supply voltage of the 
    regulator, the power dissipation is divided between the RF section and the controller section.
    External
    Microphone
    Internal
    Microphone
    External
    Speaker
    Internal
    Speaker
    SCI to
    Controlhead Audio
      PA Audio/Signalling
       Architecture To Synthesizer
    Mod
    Out
    16.8 MHz
    Reference Clock
    from Synthesizer
    Recovered Audio
    To RF SectionSPI
        Digital
    ArchitectureµP Clock
       5V
    Regulator
      (5VD)RAM
    EEPROM
    FLASHHC11FL0 ASFIC_CMP
    Accessory &  5V
    from Synthesizer
    Section (5V_RF)
    Connector 
    						
    							Controller Circuits1-3
    The voltage VSTBY, which is derived  directly from the supply voltage by components R0621 and 
    VR0621, is used to buffer the internal RAM. C0622 allows the battery voltage to be disconnected for 
    a couple of seconds without losing RAM parameters. Dual diode D0621 prevents radio circuitry from 
    discharging this capacitor.  When the supply voltage is applied to the radio, C0622 is charged via 
    R0621 and D0621. To avoid that the µP enters the wrong mode when the radio is switched on while 
    the voltage across C0622 is still too low, the regulated 5V charges C0622 via diode D0621.
    Figure 2-1 DC Power Distribution Block Diagram
    The voltage INT SW B+ from switching transistor Q0661 provides power to the circuit controlling the 
    audio PA output. The voltage INT SW B+ voltage is monitored by the µP through voltage divider 
    R0671 / R0672 and line BATTERY VOLTAGE. Diode VR0671 limits the divided voltage to 5.6V to 
    protect the µP.
    Regulator U0611 is used to generate the voltage for the switched supply voltage output (SWB+) at 
    the accessory connector J0501 pin 13. U0611 is configured to operate as a switch with voltage and 
    current limit. R0611 / R0612 set the maximum output voltage to 16.5 volts. This limitation is only 
    active at high supply voltage levels. The regulator output is electronically enabled by a 0 volt signal 
    on pin 2. Q0661, Q0641 and R0641 are used to disable the regulator when the radio is turned off. 
    Input and output capacitors (C0603 and C0611 / C0612) are used to reduce high frequency noise.
    Diode VR0601 acts as protection against transients and wrong polarity of the supply voltage.
    Fuse F0401 prevents damage of the board in case the FLT A+ line is shorted at the controlhead 
    connector.
    1.4 Electronic ON/OFF
    The radio has circuitry which allows radio software and/or external triggers to turn the radio on or off 
    without direct user action. For example, automatic turn on when ignition is sensed and off when 
    ignition is off.
    Q0661 is used to provide INT SW B+ to the various radio circuits and to enable the voltage 
    regulators via transistor Q0641. Q0661 contains an pnp and an npn transistor and acts as an 
    electronic on/off switch. The switch is on when the collector of the npn transistor within Q0661 is low. 
    When the radio is off the collector is at supply voltage level. This effectively prevents current flow 
      VCOBIC  FRACTN
    VSTBY
    5V_RF 9V3
    FLT_A+
    5VD
    SWB+
    Option Board 
    40 Pin Connector PA, Driver 
    Antenna SwitchControlhead
    12 Pin Connector Accessories
    20 Pin ConnectorJ0601 
    13.2V
    PASUPVLTG
    FLT_A+16.5V
    Limiter
    ON / OFF
    Control
    ASFIC_CMP
    5.6VIgnition
    Emergency
    ON/OFF
    9.3V
    Regulator
    Audio PA
    6V
    Regulator5V
    Regulator
    5VD
    5V
    Regulator5V/
    VDDA
    MCU 
    µP, RAM, 
    FLASH & EEPROM PCIC, 
    TX Amp
    Temp Sense
     RX RF Amp
    IF Amp
    F0401 
    						
    							1-4THEORY OF OPERATION
    from emitter to collector of the pnp transistor. When the radio is turned on the voltage at the base of 
    the npn transistor is pulled high and the pnp transistor  switches on (saturation). With voltage INT 
    SWB+ now at supply voltage level, transistor Q0641 pulls pin 2 of the voltage regulators U0611 and 
    U 0641 to ground level and thereby enables their outputs. 
    The electronic on/off circuitry can be enabled by the microprocessor (through ASFIC CMP port 
    GCB2, line DC POWER ON), the emergency switch (line EMERGENCY CONTROL), the 
    mechanical On/Off/Volume knob on the controlhead (line ON OFF CONTROL), or the ignition sense 
    circuitry (line IGNITION CONTROL). If any of the 4 paths cause a low at the collector of the npn 
    transistor within Q0661, the electronic ON is engaged.
    1.5 Emergency
    The emergency switch (J0501 pin 9), when engaged, grounds the base of Q0662 via line 
    EMERGENCY CONTROL. This switches Q0662 off and resistor R0662 pulls the collector of Q0662 
    and the base of Q0663 to levels above 2 volts. Transistor Q0663 switches on and pulls the collector 
    of the npn transistor within Q0661 to ground level and thereby enables the voltage regulators via 
    Q0641. When the emergency switch is released R0541 pulls the base of Q0662 up to 0.6 volts. This 
    causes the collector of transistor Q0662 to go low (0.2V), thereby switching Q0663 off.
    While the radio is switched on, the microprocessor monitors the voltage at the emergency input on 
    the accessory connector via pin 60 and line GP5 IN ACC9. Three different conditions are 
    distinguished, no emergency, emergency, and open connection to the emergency switch. If no 
    emergency switch is connected or the connection to the emergency switch is broken, the resistive 
    divider R0541 / R0512 will set the voltage to about 4.7 volts. If an emergency switch is connected, a 
    resistor to ground within the emergency switch will reduce the voltage on line GP5 IN ACC9 to inform 
    the microprocessor that the emergency switch is operational. An engaged emergency switch pulls 
    line GP5 IN ACC9 to ground level. Diode D0179 limits the voltage to protect the microprocessor 
    input. 
    While EMERGENCY CONTROL is low, INT SW B+ is on, the microprocessor starts execution, reads 
    that the emergency input is active through the voltage level of line GP5 IN ACC9, and sets the DC 
    POWER ON output of the ASFIC CMP pin 13 to a logic high. This high will keep Q0661 and Q0641 
    switched on. This operation allows a momentary press of the emergency switch to power up the 
    radio. When the microprocessor has finished processing the emergency press, it sets the DC 
    POWER ON line to a logic 0. This turns off Q0661 and the radio turns off. Notice that the 
    microprocessor is alerted to the emergency condition via line GP5 IN ACC9. If the radio was already 
    on when emergency was triggered then DC POWER ON would already be high.
    1.6 Mechanical ON/OFF
    This refers to the typical on/off/volume knob, located on the controlhead, and which turns the radio 
    on and off.
    If the radio is turned off and the on/off/volume knob is pressed, line ON OFF CONTROL (J0401 pin 
    11) goes high and switches the radio’s voltage regulators on as long as the button is pressed. The 
    microprocessor is alerted through line ON OFF SENSE (U0101 pin 6) which is pulled to low by 
    Q0110 while the on / off / volume knob is pressed. In addition, an interrupt is generated at µP pin 96. 
    The µP asserts line DC POWER ON via ASFIC CMP, pin 13 high which keeps Q0661 and Q0641, 
    and in turn the radio, switched on. When the on/off/volume knob is released again the controlhead 
    informs the µP via SBEP bus about the knob release. (See SBEP Serial Interface subsection for 
    more details). This informs the µP to keep the radio switched on and continue with normal operation.
    If the on/off/volume knob is pressed while the radio is on, the controlhead informs the µP via SBEP 
    bus about the knob status. (See SBEP Serial Interface subsection for more details). After a short 
    delay time the microprocessor switches the radio off by setting DC POWER ON to low via ASFIC 
    CMP pin 13. 
    						
    							Controller Circuits1-5
    1.7 Ignition
    Ignition sense is used to prevent the radio from draining the vehicle’s battery because the engine is 
    not running. 
    When the IGNITION input (J0501 pin 10) goes above 5 volts Q0661 is turned on via line IGNITION 
    CONTROL. Q0661 turns on INT SW B+ and the voltage regulators by turning on Q0641 and the 
    microprocessor starts execution. The microprocessor is alerted through line GP6 IN ACC10. The 
    voltage at the IGNITION input turns Q0181 on, which pulls microprocessor pin 74 to low. If the 
    software detects a low state it asserts DC POWER ON via ASFIC pin 13 high which keeps Q0661 
    and Q0641, and in turn the radio switched on.
    When the IGNITION input goes below 3 volts, Q0181 switches off and R0181 pulls microprocessor 
    pin 74 to high. This alerts the software to switch off the radio by setting DC POWER ON to low. The 
    next time the IGNITION input goes above 5 volts the above process will be repeated. 
    1.8 Microprocessor Clock Synthesizer
    The clock source for the microprocessor system is generated by the ASFIC CMP (U0221). Upon 
    power-up the synthesizer IC (FRAC-N) generates a 16.8 MHz waveform that is routed from the RF 
    section to the ASFIC CMP pin 34. For the main board controller the ASFIC CMP uses 16.8 MHz as a 
    reference input clock signal for its internal synthesizer. The ASFIC CMP, in addition to audio circuitry, 
    has a programmable synthesizer which can generate a synthesized signal ranging from 1200Hz to 
    32.769MHz in 1200Hz steps.
    When power is first applied, the ASFIC CMP will generate its default 3.6864MHz CMOS square 
    wave UP CLK (on U0221 pin 28) and this is routed to the microprocessor (U0101 pin 90). After the 
    microprocessor starts operation, it reprograms the ASFIC CMP clock synthesizer to a higher UP 
    CLK frequency (usually 7.3728 or 14.7456 MHz) and continues operation.
    The ASFIC CMP may be reprogrammed to change the clock synthesizer frequencies at various 
    times depending on the software features that are executing. In addition, the clock frequency of the 
    synthesizer is changed in small amounts if there is a possibility of harmonics of this clock source 
    interfering with the desired radio receive frequency.
    The ASFIC CMP synthesizer loop uses C0245, C0246 and R0241 to set the switching time and jitter 
    of the clock output. If the synthesizer cannot generate the required clock frequency it will switch back 
    to its default 3.6864MHz output.
    Because the ASFIC CMP synthesizer and the µP system will not operate without the 16.8 MHz 
    reference clock it (and the voltage regulators) should be checked first in debugging the system.
    The microprocessor uses XTAL Y0131 and associated components to form a Real Time Clock 
    (RTC). It may be used to display the time on controlheads with display or as time stamp for incoming 
    calls or messages. The real time clock is powered from the voltage VSTBY to keep it running while 
    the radio is switched off. When the radio was disconnected from it’s supply voltage, the time must be 
    set again.
    1.9 Serial Peripheral Interface (SPI)
    The µP communicates to many of the IC’s through its SPI port. This port consists of SPI TRANSMIT 
    DATA (MOSI) (U0101-100), SPI RECEIVE DATA (MISO) (U0101-99), SPI CLK (U0101-1) and chip 
    select lines going to the various ICs, connected on the SPI PORT (BUS). This BUS is a synchronous 
    bus, in that the timing clock signal CLK is sent while SPI data (SPI TRANSMIT DATA or SPI 
    RECEIVE DATA) is sent. Therefore, whenever there is activity on either SPI TRANSMIT DATA or SPI 
    RECEIVE DATA there should be a uniform signal on CLK. The SPI TRANSMIT DATA is used to send 
    serial from a µP to a device, and SPI RECEIVE DATA is used to send data from a device to a µP.  
    						
    							1-6THEORY OF OPERATION
    On the controller there are two ICs on the SPI BUS, ASFIC CMP (U0221-22), and EEPROM 
    (U0111-5). In the RF sections there are 2 ICs on the SPI BUS, the FRAC-N Synthesizer, and the 
    Power Control IC (PCIC). The SPI TRANSMIT DATA and CLK lines going to the RF section are 
    filtered by L0481 / R0481 and L0482 / R0482 to minimize noise. The chip select line CSX from 
    U0101 pin 2 is shared by the ASFIC CMP, FRAC-N Synthesizer and PCIC. Each of these IC‘s check 
    the SPI data and when the sent address information matches the IC’s address, the following data is 
    processed. The chip select lines for the EEPROM (EE CS), Voice Storage (VS CS), expansion board 
    (EXP1 CS, EXP2 CS) and option board (OPT CS) are decoded by the address decoder U0141.
    When the µP needs to program any of these IC’s it brings the chip select line CSX to a logic 0 and 
    then sends the proper data and clock signals. The amount of data sent to the various IC’s are 
    different, for example the ASFIC CMP can receive up to 19 bytes (152 bits) while the PCIC can 
    receive up to 6 bytes (48 bits). After the data has been sent the chip select line is returned to logic 1.
    The Option board interfaces are different in that the µP can also read data back from devices 
    connected.The timing and operation of this interface is specific to the option connected, but 
    generally follows the pattern: 
    1. an option board device generates a service request via J0551-29, line RDY and µP pin 79,
    2. the main board asserts a chip select for that option board device via U0141-14, line OPT CS, 
    J0551-30,
    3. the main board µP generates the CLK (J0551-3),
    4. the main board µP writes serial data via J0551-15 and reads serial data via J0551-16 and,
    5. when data transfer is complete the main board terminates the chip select and CLK activity.
    1.10 SBEP Serial Interface
    The SBEP serial interface allows the radio to communicate with the Customer Programming 
    Software (CPS), or the Universal Tuner via the Radio Interface Box (RIB). This interface connects to 
    the microphone connector via controlheadcontrolhead connector (J0401-8) and to the accessory 
    connector J0501-17 and comprises BUS+. The line is bi-directional, meaning that either the radio or 
    the RIB can drive the line. The microprocessor sends serial data via pin 98 and D0101 and it reads 
    serial data via pin 97. Whenever the microprocessor detects activity on the BUS+ line, it starts 
    communication. 
    In addition, the SBEP serial interface is used to communicate with a connected controlhead. When a 
    controlhead key is pressed or the volume knob is rotated, the line ON OFF CONTROL goes high. 
    This turns on transistor Q0110 which pulls line ON OFF SENSE and µP pin 6 to ground level. In 
    addition, an interrupt is generated at µP pin 96. This indicates that the controlhead wants to start 
    SBEP communication. The microprocessor then requests the data from the controlhead. The 
    controlhead starts sending and after all data has been send, the ON OFF CONTROL line goes low. 
    The controlheadcontrolhead ignores any data on BUS+ during SBEP communication with the CPS 
    or Universal Tuner.
    1.11 General Purpose Input/Output
    The controller provides eight general purpose lines (DIG1 through DIG8) available on the accessory 
    connector J0501 to interface to external options. Lines DIG IN 1,3,5,6, are inputs, DIG OUT 2 is an 
    output and DIG IN OUT 4,7,8 are bidirectional. The software and the hardware configuration of the 
    radio model define the function of each port.
    DIG IN 1 can be used as external PTT input, DATA PTT input or others, set by the CPS. 
    The µP reads this port via pin 77 and Q0171. 
    						
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