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Puxing PX-777 Service Manual
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Puxing PX-777 Service Manual

Uhf/vhf fm transceiver
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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

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Summary of Contents for Puxing PX-777

  • Page 1 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...
  • Page 2 Keep the Radio dry. Rainwater or damp will corrode electronic circuits. If it appears that the Radio diffuses peculiar smell or smoke, please shut off its power immediately and take off charger or battery in the Radio, then contact with PUXING agency. Do not transmit without antenna.
  • Page 3 2. LCD DISPLAY...
  • Page 4 3. SELF-PROGRAMMING MODE For frequency,signal,feature write to the radio...
  • Page 6 TECHNICAL SPECIFICATION General 136 ― 174MHz ， 350 — 390MHz ， 400 — Frequency Range 470MHz,245Mhz －20℃―＋50℃ Working Temperate Operating Voltage DC 7.2V Operate Mode Simplex or Semi-duplex Channel spacing 25Khz/12.5Khz Dimension 100mm×55mm×32mm (Not included Antenna) Weight 220g (Including battery) Antenna impedance 50Ω...
  • Page 16 PDF created with pdfFactory Pro trial version www.pdffactory.com...
  • Page 17 PDF created with pdfFactory Pro trial version www.pdffactory.com...
  • Page 18 102P C313 C314 C315 PR311 101P 101P 101P L329 R333 L347 C347 R368 R362 101T 100nH 102P C362 560R 150R C360 L351 L361 D351 C353 C355 R367 R365 R363 R361 270nH C906 560R 101T L352 1SV325 L355 T351 28.8MHZ 270nH 3.3uH R366 R364...
  • Page 19 DTA114EE C181 E181 C173 R171 4.7uF 102P (T.Y.) 103P C171 C172 C302 C301 T201 105P 103P 0.39R 103P 103P R256 DTA114EE R195 R172 150K R301 U161A C195 T103 C256 C101 U161B C185 C201 LM2904V 0.39R R102 2SB624 470P 471P 103P 104P LM2904V R185...
  • Page 20 C181 E181 C173 R171 4.7uF 102P (T.Y.) 103P C171 C172 T201 105P 103P 0.39R C602 DTA114EE R195 R172 150K 124P U161A C195 T103 C101 U161B C185 T602 C201 LM2904V 0.39R R102 2SB624 470P 471P 104P LM2904V R185 2SB624 103P R181 R198 R173 R101...
  • Page 21 C329 E319 C325 C319 CR311 4.7uF 103P T321 R325 R389 C388 C387 104P 2SC4617(S) (T.Y.) T352 X OUT L326 R383 180R VR351 104P 102P 100nH UMC4 L324 L363 C318 R321 C321 D321 14.4MHz 101T C322 C327 C328 102P L325 T332 R388 MA2S11 R346...
  • Page 22 P_TX P_TX C144 L142 C395 C394 R138 470P C128 C113 C114 R128 103P 101T C142 471P L132 L123 102P C138 R114 120K 103P 470P 101T 470P 101T C132 R393 N.U. R391 100R R137 R136 C146 R111 L131 C143 L143 C145 C131 C137 C122...
  • Page 23 P_TX P_TX C144 L142 R138 470P C128 C114 R128 101T C142 L132 L123 102P C138 R114 120K 470P R158 R157 101T 470P 101T C132 270R 270R N.U. R137 R136 C146 L131 C143 L143 C145 C131 C137 C122 L122 103P L161 L162 L163 103P...
  • Page 24 PX-338(400-470MHz) PART LIST 备注 Designators Footprint Comment Quantity 电容类 C0402 0.5P C241 C332 C349 C210 C0402 C226 C232 C346 C231 C0402 C216 C329 C0402 C215 C330 C0402 C229 C224 C347 C234 C0402 C348 C363 C331 C242 C352 C361 C362 C353 C0402 C359 C0402...
  • Page 25 C262 C258 C546 C666 C311 C221 C177 C243 C112 C111 C127 C125 C0402 470P C141 C223 C233 C317 C314 C356 C358 C313 C204 C310 C312 C355 C667 C135 C412 C622 C632 C531 C534 C533 C532 C173 C180 C260 C0402 473P C424 C431 C414...
  • Page 26 L0603 6.8uH L321 L341 高频叠层 L0603 3.3nH 高频叠层 L143 L0603 15nH 高频叠层 L122 L0603 18nH L111 L242 L354 高频叠层 L0603 22nH 高频叠层 L351 L0603 27nH 高频叠层 R807 L0805 39nH C344 C325 工字型绕线 L411 L511 L313 L651 C697 L326_1 L0603 100nH 高频叠层...
  • Page 27 R0402 R455 R262 R271 R0402 R661 R356 R0402 R424 R258 R429 R434 R453 R201 R0402 R561 R361_2 R184 R203 R111 R101 R820 R0402 R519 R522 R177 R0402 R414 R187 R0402 R544 R0402 R552 R415 R541 R313_2 R515 R556 C542 R555 R436 R333 R0402...
  • Page 28 T_ESM 2SC4617(S) T421 T431 T311 T_ESM 2SJ243 T312 T_ESM 2SK1824 T541 T_ESM DTA114EE T261 T573 T_ESM DTC114EE T451 T571 T572 T_SOT89 2SK3475 T131 T_SOT89 U631 U621 T_TSM 2SB624 T452 T544 T101 T521 T301 T_TSM 2SK508NV T331 T341 T_USM 1SS372 D411 T_USM 2SC3356 T361...

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Px-328Px-338