Puxing PX-777 Service Manual

UHF/VHF FM TRANSCEIVER
PX-777/328/338
SERVICE MANUAL
------------------CONTENTS--------------------------
INTRODUCTION……………………………………………………2
GENERAL ................................................................................. 2
REALIGNMENT……………………………………………………..3
TROUBLE SHOOTING GUIDE……………………………………6
TECHNICAL SPECIFICATION ............................................. …7
FUNCTION SPECIFICATION…………………………………….8
CIRCUIT DESCRIPTION ......................................................... 9
SEMICONDUCTOR DATA.............................................……. 16
PARTS LIST............................................................................ 17
BLOCK DIAGRAM …………………........................................ 22
PCB BOARD………………………………………………………23
SCHEMATIC DIAGRAM....................................................... 25

Puxing PX-777 Specifications

General

Frequency Range	400-470MHz
Channel Capacity	128 channels
Battery Capacity	1200mAh
Antenna Impedance	50 ohms
Operating Temperature	-20°C to +60°C
Weight	220g (including battery)
Channel Spacing	25/12.5 kHz
Power Output	5W (High), 1W (Low)
Operating Voltage	7.4V DC
Modulation	16K0F3E / 11K0F3E