User manual PUXING PX-328 SERVICE MANUAL

[. . . ] UHF/VHF FM TRANSCEIVER PX-777/328/338 SERVICE MANUAL ------------------CONTENTS-------------------------INTRODUCTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] Changes which may occur after publication are covered by either Service Bulletins or Manual Revisions. These are issued as required. ORDERING REPLACEMENT PARTS When ordering replacement parts or equipment information, the full part identification number should be included. If the part number is not known, include the chassis or kit number of which it is a part, and a sufficient description of the required component for proper identification. PERSONNEL SAFETY The following precautions are recommended for personnel safety: DO NOT transmit until all RF connectors are verified secure and any open connectors are properly terminated. SHUT OFF and DO NOT operate this equipment near electrical blasting caps or in an explosive atmosphere. This equipment should be serviced by a qualified technician only. SERVICE This radio is designed for easy servicing. Refer to the schematic diagrams, printed circuit board views, and alignment procedures contained within. GENERAL Your Transceiver is an electronic product of exact design and should be treated with care . The suggestions below will help you to fulfill any warranty obligations and to enjoy this product for many years. When using regulated power supply, take notice of power voltage must be between 6V and 8V to avoid damaging the unit. High temperatures can shorten the life of electronic devices, and warp or melt certain plastics. [. . . ] D215 N. U. L213 3T L212 3T C214 3P C212 15P R212 0R B VC241 6P C237 10P L216 3T L214 3T VC220 6P BATT C904 103P C903 103P L901 101T C902 102P C901 105P C D214 HVC350B C222 470P C216 470P R213 100K BAT111 BATTERY BATT 5T C401 103P C444 104P R443 1M8 R442 33K C442 332P T431 2SK1824 R438 100R R401 470R C416 R413 5K6 R414 E401 4. 7uF (T. Y. ) SW411A RD91 BEEP R450 10R 5T C408 102P 5T SB R405 22K APC/TUNE SB P-AMP 8 C446 470P R448 R446 33K T441 2SC4617 C443 680P R441 33K C441 473P R435 4K7 U411A R433 LM4558 1 R431 30K 3 2 E431 (T. Y. ) 4. 7uF U411B C431 223P LM4558 7 6 5 C405 102P C406 223P R406 750K C407 102P C404 273P C402 R403 100K 104P C403 470P L402 MIC 101T R432 1K5 SP AFin BEEP SW711 C711 103P ANKEY C445 473P R444 10K 4 1K8 R434 51K R436 1K8 C434 R404 18K SW712 BEEP C422 104P D422 1SS372 3 3 2 10P R437 3K3 R421 820R T421 MRF497 E421 2. 2uF (T. Y. ) C713 102P PTT SW713 ANKEY R715 B DTA114EE 5VOX C412 103P C413 103P C438 470P 2 1 R716 4K7 1 R402 1K8 0R [. . . ]