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Provides information on product safety and RF energy exposure for mobile radios in vehicles or fixed site control stations.
Details compliance requirements for RF energy exposure standards and guidelines.
Warns against placing radios in air bag deployment areas to prevent injury from inflating air bags.
Defines the intended audience and currency of the service manual's information.
Outlines Motorola's support offerings for products during and after the warranty period.
Recommends periodic visual inspection and cleaning of radios as preventive maintenance.
Details precautions for handling CMOS and LDMOS devices to prevent damage from electrostatic charges or voltage.
Covers general repair procedures, including parts replacement and techniques for circuit boards.
Lists service aids recommended for radio work, available from Motorola or as substitutes.
Provides a general overview of the control head, its components, and the microprocessor used.
Explains the theory of operation for control head circuits, including power supplies, microprocessor, and interfaces.
Provides a flow chart for diagnosing and resolving issues with the GM328 control head's power on/off functionality.
Guides troubleshooting for GM338 control head issues, covering on/off, microprocessor, display, and backlight problems.
Provides a flow chart for diagnosing GM398 control head issues, including on/off, microprocessor, and display problems.
Details the location of schematics and circuit boards for control heads, including reference pages.
Shows the PCB layout for the GM328 control head, including top and bottom sides.
Shows the PCB layout for the GM338 control head, including top and bottom sides.
Shows the PCB layout for the GM398 control head, including top and bottom sides.
Explains the theory of operation for the radio's controller circuits, including microprocessor, memory, and I/O.
Details the DC power distribution for the controller, including voltage regulation circuits.
Explains the microprocessor's operation in expanded mode, utilizing external memory devices for calculations.
Details the functions of the ASFIC CMP, including audio shaping, signalling, and squelch detection.
Provides a troubleshooting flow chart for controller-related issues, covering power, output, and various component checks.
Provides model charts and technical specifications for VHF radios.
Explains the theory of operation for VHF circuits in the radio.
Provides troubleshooting flow charts for receiver, transmitter, synthesizer, and VCO.
Provides model charts and technical specifications for the GM338 VHF radio.
Explains the theory of operation for the VHF circuits in the radio.
Provides model charts and technical specifications for the GM328/GM338/GM398 UHF radio.
Explains the theory of operation for the UHF circuits in the radio.
Details the location of schematics and circuit boards for UHF circuits, including controller and RF components.
Lists the component layouts, schematics, and parts for UHF Band 2 PCBs.
Provides model charts and technical specifications for the GM338 UHF radio.
Explains the theory of operation for the UHF circuits in the radio.
Provides a flow chart for diagnosing receiver issues, starting with audio output and progressing to LO presence and voltages.
Guides troubleshooting of transmitter issues, starting with power output and progressing through component checks.
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