Motorola GM300 Service Manual
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Motorola GM300 Service Manual

136-162 mhz 146-174 mhz 403-433 mhz 438-470 mhz 465-495 mhz 490-520 mhz
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See also: Service Manual , User Manual
GM300
Mobile Radios
136-162 MHz
146-174 MHz
403-433 MHz
438-470 MHz
465-495 MHz
490-520 MHz
Service Manual
6880902Z32-A

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Summary of Contents for Motorola GM300

  • Page 1 GM300 Mobile Radios 136-162 MHz 146-174 MHz 403-433 MHz 438-470 MHz 465-495 MHz 490-520 MHz Service Manual 6880902Z32-A...

  • Page 2: Table Of Contents

    Data Path ................2-9 © Motorola,. All Rights Reserved Printed In U.S.A. 1997...
  • Page 3 Table of Contents Name of Manual Transmitter Power Control..............2-10 Control Line Functions .
  • Page 4 Name of Manual Table of Contents Circuit Board Details and Schematic for HLE8385A UHF Power Amplifier, 403-433 MHz, 1-10 Watts ..........23 Circuit Board Details and Schematic for HLE8275A UHF Power Amplifier, 403-433 MHz, 25-40 Watts .
  • Page 5 Table of Contents Name of Manual 68 No. March, 1997...

  • Page 6: Scope Of Manual

    Mt. Pleasant, IA 52641 USA four sections that deal with speciÞc service aspects of 1-800-356-1520 the GM300. Refer to the Table of Contents for a general 319-385-5395 (International) overview of the manual, or to the ÒOverviewÓ para- graph in each section for a speciÞc overview of the Radius 30-Day Warranty information in that section.

  • Page 7: Model Charts

    Power Cable X X X X HMN3413_ Microphone w/hangup clip X X X X HLN5189_ Installation Kit X X X X 6880902Z09 Owners Manual GM300 6880902Z26 Operator Card 8 Channel X X 6880902Z41 Operator Card 16 Channel 68 No. March, 1997...
  • Page 8 Power Cable X X X X HMN3413_ Microphone w/hangup clip X X X X HLN5189_ Installation Kit X X X X 6880902Z09 Owners Manual GM300 6880902Z26 Operator Card 8 Channel X X 6880902Z41 Operator Card 16 Channel March, 1997 68 No.
  • Page 9 Power Cable X X X X HMN3413_ Microphone w/hangup clip X X X X HLN5189_ Installation Kit X X X X 6880902Z09 Owners Manual GM300 6880902Z26 Operator Card 8 Channel X X 6880902Z41 Operator Card 16 Channel 68 No. March, 1997...
  • Page 10 X X X X X HMN3413_ Microphone w/hangup clip X X X X X HLN5189_ Installation Kit X X X X X 6880902Z09 Owners Manual GM300 6880902Z26 Operator Card 8 Channel X X X 6880902Z41 Operator Card 16 Channel March, 1997...
  • Page 11 Power Cable X X X X HMN3413_ Microphone w/hangup clip X X X X HLN5189_ Installation Kit X X X X 6880902Z09 Owners Manual GM300 6880902Z26 Operator Card 8 Channel X X 6880902Z41 Operator Card 16 Channel viii 68 No.
  • Page 12 Power Cable X X X X HMN3413_ Microphone w/hangup clip X X X X HLN5189_ Installation Kit X X X X 6880902Z09 Owners Manual GM300 6880902Z26 Operator Card 8 Channel X X 6880902Z41 Operator Card 16 Channel March, 1997 68 No.
  • Page 13 Power Cable X X X X HMN3413_ Microphone w/hangup clip X X X X HLN5189_ Installation Kit X X X X 6880902Z09 Owners Manual GM300 6880902Z26 Operator Card 8 Channel X X 6880902Z41 Operator Card 16 Channel 68 No. March, 1997...
  • Page 14 Power Cable X X X X HMN3413_ Microphone w/hangup clip X X X X HLN5189_ Installation Kit X X X X 6880902Z09 Owners Manual GM300 6880902Z26 Operator Card 8 Channel X X 6880902Z41 Operator Card 16 Channel March, 1997 68 No.
  • Page 15 Power Cable X X X X HMN3413_ Microphone w/hangup clip X X X X HLN5189_ Installation Kit X X X X 6880902Z09 Owners Manual GM300 6880902Z26 Operator Card 8 Channel X X 6880902Z41 Operator Card 16 Channel 68 No. March, 1997...
  • Page 16 Power Cable X X X X HMN3413_ Microphone w/hangup clip X X X X HLN5189_ Installation Kit X X X X 6880902Z09 Owners Manual GM300 6880902Z26 Operator Card 8 Channel X X 6880902Z41 Operator Card 16 Channel xiii March, 1997...
  • Page 17 Power Cable X X X X HMN3413_ Microphone w/hangup clip X X X X HLN5189_ Installation Kit X X X X 6880902Z09 Owners Manual GM300 6880902Z26 Operator Card 8 Channel X X 6880902Z41 Operator Card 16 Channel 68 No. March, 1997...

  • Page 18: Accessories

    Name of Manual Foreword Accessories Accessories Radius offers many accessories to increase communications efÞciency. Some of the accessories available are listed below. For a complete list, consult your Radius dealer. Antennas: HAD4007_R VHF 146-150.8 MHz, 1/4 wave roof mount HAD4008_R VHF 150.8-162 MHz, 1/4 wave roof mount HAD4009_R VHF 162-174 MHz, 1/4 wave roof mount...
  • Page 19 High Tier Radio-Telephone Interconnect and cable HLN9573_R Shorting Plug - Þlls microphone jack when no microphone is being used Manuals: 6880902Z26 OperatorÕs card - GM300 8 channel radios 6880902Z41 OperatorÕs card - GM300 16 channel radios 6880902Z09 OwnerÕs manual - GM300...

  • Page 20: Specifications

    Name of Manual Foreword Specifications Specifications GENERAL Model Series: M03GMC M33GMC M33GMC M43GMC M43GMR M04GMC M34GMC M44GMC M44GMC M44GMC M44GMC Frequency Range: 146-174 MHz 136-162 MHz 146-174 MHz 403-433 MHz 438-470 MHz 438-470 MHz 403-433 MHz 438-470 MHz 465-495 MHz 490-520 MHz RF Output: 1-10 W*...
  • Page 21 Foreword Name of Manual Specifications xviii 68 No. March, 1997...

  • Page 22: Disassembly/Re-Assembly

    Section 1 Radio Disassembly / Re-assembly Disassembly/Re-assembly Radio Disassembly and Assembly To Remove Control Head & Chassis Covers 1. Remove control head mounting screws (Figure 1-1). 2. Pull control head off and away from the radio. 3. Carefully remove control head connectors from chassis.

  • Page 23: To Remove The Logic Circuit Board

    Disassembly/Re-assembly Name of Manual Radio Disassembly and Assembly 6-PIN LOGIC HEATSINK BOARD CONNECTOR MOUNTING MOUNTING SCREWS SCREWS FILTER Figure 1-4. BOARD FILTER BOARD SCREWS After removing the RF shield, remove all RF Figure 1-6. board mounting screws and take out the RF board (Figure 1-5).
  • Page 24 Name of Manual Disassembly/Re-assembly Radio Disassembly and Assembly Figure 1-8. Figure 1-9. Table 1-1. Fasteners, Tools and Torques Part Number Description Location Input Torq. Repair Torq. 03-10945A11 M3 x 8 Plastite Control Head Board and 8 in.-lbs. 8 in.-lbs. Slt Torx¨ Pan Hd. Internal Speaker 03-80270L01 M4 x 0.7 x 38 Mach.

  • Page 25: Alignment

    The advanced design and manufacturing procedures R2001D: Communication Systems Analyzer eliminate the need for traditional tuning tasks. All the circuits in the GM300 radio have been aligned at the factory with specialized equipment. R2200B: Service Monitor Alignment in the Þeld should not be attempted or nec- essary.

  • Page 26: Theory Of Operation

    Theory of Operation RF Board +13 dBm is delivered to the Þrst mixer from the second RX buffer in the synthesizer circuit. VHF Receiver Front End, 146-174 MHz The mixer output is connected to a diplexer network which matches its output to the Þrst IF ampliÞer Q51 at The received signal applied to the radioÕs antenna the IF frequency of 45.1 MHz, and terminates it in a input connector is Þrst routed through the harmonic...

  • Page 27: Receiver Back End

    Theory of Operation Name of Manual RF Board point is linearly related to the input signal level at the Range 403-433 438-470 465-495 490-520 antenna, allowing a convenient metering point for Þl- 1 dB BW: 35 MHz 45 MHz 40 MHz 40 MHz ter tuning and gain measurements.
  • Page 28 Name of Manual Theory of Operation RF Board Figure 2-1. Receiver IC Block Diagram In UHF radios, for example, the latches are loaded with N = 128 x A + 127 x (N-A) = 127 x N + A data to give 5 kHz (or 6.25 kHz) at the output of the divide-by-R counter when the reference signal is The output of the divide-by-N counter is equal to: applied at U101-1, and 5 kHz (or 6.25 kHz) at the out-...
  • Page 29 Theory of Operation Name of Manual RF Board Figure 2-2. Synthesizer Section Block Diagram 68 No. March, 1997...

  • Page 30: Charge Pump

    Name of Manual Theory of Operation RF Board phase detector A is applied to phase detector B. There of summed current pulses to the loop Þlter that charges are two output signals for phase detector B, phase R or discharges C110 to the new SL voltage. If the fre- (U101-16) and phase V (U101-15), which consist of quency of the VCO is higher than that of phase R, then pulses whose pulse width depends on the phase error...

  • Page 31: Logic Board

    U401 and U451 (energizing the 9.6 volt regulator and transmitter There are two versions of logic boards used in GM300 power control circuits). The low saturation voltage of series mobile radios, ÒmaskedÓ and Òexpanded.Ó The...

  • Page 32: Microcomputer Start-Up Routine

    Microcomputer and Logic microcomputer and, in expanded logic boards, gate array U803. The microcomputer then executes a self- GM300 radios use the Motorola 68HC11E9 microcom- test routine and generates an error tone if a failure is puter, U802, which utilizes: detected.

  • Page 33: Reading Or Writing In Memory-Expanded Logic

    Theory of Operation Name of Manual Logic Board The microcomputer puts the address information on to provide an additional 6 dB of receiver audio gain in AD0-AD7 and the information is then passed to U803. 12.5 kHz channel spacing models, where full system The address strobe ÒASÓ...

  • Page 34: Data Path

    Name of Manual Theory of Operation Logic Board Data Path tion is adjusted by programming the DC output volt- age of D/A converter U801-6. This allows electronic Receiver audio is also used for decoding of signaling adjustment of deviation, compensation for sensitivity tones or codes.

  • Page 35: Transmitter Power Control

    Theory of Operation Name of Manual RF Power Amplifiers Transmitter Power Control microcomputer reduces power via the D/A converter to achieve a safe equilibrium. Control Line Functions Under any circumstance, controlled B+ is prevented from exceeding a pre-programmed DC voltage. The As discussed earlier, all DC operating voltage for the voltage is divided by R471 and R472 and monitored by radio originates from the RF power ampliÞer via J7-5...

  • Page 36: Watt Vhf Power Ampliþer

    Name of Manual Theory of Operation RF Power Amplifiers impedance of CR2251 appears as a high impedance at provides 11 dB of gain and has an output power of the junction of CR2250 and the harmonic Þlter input. 250 mW. The harmonic Þlter is a nine pole 0.1 dB ripple Cheby- The second stage, Q2320, is operated in Class C.

  • Page 37: 25-35/40 Watt Uhf Power Ampliþers

    Theory of Operation Name of Manual RF Power Amplifiers The third stage, Q2530, is the Class C RF Þnal power CR2651 when it is turned on. In the receive mode, both ampliÞer. It provides 8.75 dB of gain and an output diodes are off.

  • Page 38: Front Panel Boards

    Name of Manual Theory of Operation Front Panel Boards with the internal ÒonÓ inductance of CR2751, form a ¥ F1 TRANSMIT: P9-4 is low, therefore Q1003 is series resonant circuit to lower the shunt impedance off (DS1002 cannot light) and Q1001 is on presented by CR2751 when it is conducting.

  • Page 39: Vol/Mic Board

    Theory of Operation Name of Manual Front Panel Boards Vol/Mic Board Front Panel Filter Board The front panel Þlter board is mounted to the front of The VOL/MIC circuit board provides mounting and the radio chassis. The pins of logic board connectors J8 electrical connection to the microphone jack J11 and the and J9 pass through this board and are soldered to it.

  • Page 40: Jumper-Selectable Options

    Section 3 Jumper-Selectable Options Overview Push-on jumpers, located on the logic board, allow the operation of the radio to be customized to speciÞc applica- tions, as explained below. This section contains information about the possible positions for each jumper, and the corresponding options.
  • Page 41 Jumper-Selectable Options Name of Manual Jumper Positions 68 No. March, 1997...

  • Page 42: Non-Field Servicable Components

    GM300 moible radios. Operation of the Reference Oscillator The frequency stability of the reference oscillator in the GM300 mobile radios is maintained by electronically mea- suring the temperature of the oscillatorÕs crystal, computing the control voltage needed to accurately compensate for the temperature-dependent frequency shift of the crystal, and applying this voltage to the tuning varactors in the oscillator circuit.
  • Page 43 Non-Field Servicable Components Name of Manual Non-Field Servicable Components Ref. No. Part No. Description Location _________________________________________________________________________________________________ R176 06-11077G26 chip resistor, 22.6k, 1% RF Board R177 06-11077G18 chip resistor, 18.7k, 1% RF Board R178, 179 06-11077F91 chip resistor, 10.0k, 1% RF Board R180 06-11077G52 chip resistor, 42.2k, 1%...

  • Page 44: Parts List

    HLE8230A RF Board, 403-433 MHz, 12.5 kHz (N) HLE8230A RF Board, 403-433 MHz, 12.5 kHz (N) HLE8229A RF Board, 403-433 MHz, 25 kHz (W) PL-921021-O HLE8229A RF Board, 403-433 MHz, 25 kHz (W) PL-921021-O REFERENCE MOTOROLA REFERENCE MOTOROLA SYMBOL PART NO. DESCRIPTION SYMBOL PART NO.
  • Page 45 HLE8230A RF Board, 403-433 MHz, 12.5 kHz (N) HLE8230A RF Board, 403-433 MHz, 12.5 kHz (N) HLE8229A RF Board, 403-433 MHz, 25 kHz (W) PL-921021-O HLE8229A RF Board, 403-433 MHz, 25 kHz (W) PL-921021-O REFERENCE MOTOROLA REFERENCE MOTOROLA SYMBOL PART NO. DESCRIPTION SYMBOL PART NO.
  • Page 46 (for J4) 26-80229L03 shield VCO frame 26-80256L02 shield image 42-80957X01 ground clip 75-05295B02 insulator (for Y151) 75-05295B07 insulator (3 used, for Y51A/B, Y52) note: For optimum performance, diodes, transistors, and integrated circuits must be ordered by Motorola part numbers.
  • Page 47 (2 used) 7 ±0 .25 pF 500V C2757 21-80060M13 note: For optimum performance, diodes, transistors, and integrated circuits C2758 not used must be ordered by Motorola part numbers. C2760 21-80060M19 10 pF 500V 8 ±0 .25 pF 500V C2761 21-80060M15 9 ±0 .25 pF 500V...
  • Page 48 26-80124L03 heat sink 26-80223M07 PA shield 26-80514C01 filter shield 26-80551C01 antenna connector shield 32-80014N03 gasket, accessory connector 42-80281L01 ground clip (2 used for Q2740) note: For optimum performance, diodes, transistors, and integrated circuits must be ordered by Motorola part numbers.
  • Page 49 Motorola Radius Division Hwy 34, West. 6880902Z32-A Mt. Pleasant, IA 52641...

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