This Instruction Manual consists of the following sections: SECTION 1 Basic Transmit/Receive and Memory Operation This section outlines the basic items you should know in order to properly operate the Transceiver BEFORE OPERATION Receiver OPERATION ACCESSORIES Transmitter OPERATION INSTALLATION INSTRUCTIONS MEMORY BASICS OPERATING CONTROLS SECTION 2 Mastering the Transceiver This section details operating instructions for the Transceiver ADVANCED RECEIVE FUNCTIONS OTHER USEFUL FUNCTIONS ADVANCED TRANSMIT FUNCTIONS REMOTE CONTROL MEMORY DISPLAY DEMONSTRATION MODE SCAN Clock Repeater OPERATION SECTION 3 Specialized Communication Modes This section provides detailed information on several tone signalling modes. CTCSS OPERATION. CD PAGE DTSS OPERATION TONE ALERT STSTEM SECTION 4 Useful Information This section provides other general information. MAINTENANCE SPECIFICATIONS OPTIONAL ACCESSORIES QUICK REFERENCE (D INSTALLING OPTIONAL ACCESSORIES

This service manual describes mainly about the parts list, the schematic diagram and the PC board of TM-642A For the circuit description and the semiconductor information, refer to the service manual of TM-742AIE TM-942A (851-8192-00)