Motorola GM900/Technical manual

Z radiowcy.org

Test mode

Open architecture radios

Trunked MPT1327 diagnostics mode

Recommended and required test equipment, service aids, tools

Maintenance

Disassembly and reassembly

Radio tuning procedure

Signalling alignments

Theory of operation

Midband, VHF, UHF

Overview

Controller section

General

Voltage regulators

Electronic On/Off

Emergency

Mechanical On/Off

Ignition

Microprocessor clock synthesizer

Serial Peripherial Interface (SPI)

SB9600 Serial interface

General purpose input/output

Normal microprocessor operaion (open controller)

Microprocessor

Support Login IC (SLIC)

FLASH EEPROM

EEPROM

SRAM

Normal microprocessor operaion (closed controller)

Controller board audio, signalling circuits

Midband specific circuit description

VHF specific circuit description

UHF specific circuit description

UHF specific circuit description 1-10 W

Control heads

Model B

Models I, J

Model C

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