TOP COVER REMOVAL ... 2 EXPLODED VIEW...3 MAIN UNIT ...4 Parts Layout 4 Circuit Diagram 5 FILTER UNIT...7 Parts Layout 7 Circuit Diagram 7 NB UNIT ...7 Parts Layout 7 Circuit Diagram 7 LOCAL UNIT ...8 Parts Layout 8 Circuit Diagram 9 100W PA UNIT...10 Parts Layout 10 Circuit Diagram 10 LPF UNIT ...11 Parts Layout 11 Circuit Diagram 11 DISPLAY UNIT...12 Parts Layout 12 Circuit Diagram 13 CONNECTION DIAGRAM...14 LEVEL DIAGRAM...15 Transmit 15 Receive 16 SIGNAL PATH...17 SSB MODE ...17 CW MODE ...18 AM MODE ...19 FM MODE ...20 ALIGNMENT...21 I. Local Unit 23 II. Main Unit Receiver 24 III. Main Unit Transmitter 26 IV. Noise Blanker Unit 27 V. 100W PA Unit (Idling Current) 27 VI. LPF Unit (CM Coupler Balance) 28 VII. Main Unit (AFP - Automatic Final Protection) 28 PARTS LIST 29 This manual is intended to serve as a supplement to the FT-747GX Operating Manual. Detailed information regarding functions, installation, interconnections and operation has been provided in the Operating Manual, and is not reprinted herein. Therefore, this supplement is not intended to serve as an independent reference, but to be used in conjunction with the information provided in the Operating Manual. Because there are nearly two hundred and fifty semiconductor devices in the FT-747GX circuit description information is provided in the form of numerous block diagrams. We hope that this manner of providing functional information proves to be more convenient for the owner and technician than would a lengthy verbal description. Those readers unfamiliar with the basic types of analog and digital circuits that serve as the building blocks of the FT-747GX are encouraged to study instructional material, such as that provided in handbooks on amateur radio and digital circuit design, before attempting to understand the design of the FT-747GX Each block in the block diagrams represents one such basic circuit. General information on integrated circuits and their applications is available in the data provided by the 1C manufacturers. Specific circuit details are provided in the schematic diagrams in this manual.