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FT-1807M 维修手册.pdf

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FT-1807M 维修手册.pdf
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Introduction This manual provides technical information necessary for servicing the FT-1807M FM Transceiver. Servicing this equipment requires expertise in handling surface-mount chip components. Attempts by non- qualified persons to service this equipment may result in permanent damage not covered by the warranty, and may be illegal in some countries. Two PCB layout diagrams are provided for each double-sided circuit board in the Transceiver. Each side of is referred to by the type of the majority of components installed on that side (“leaded” or “chip-only”). In most cases one side has only chip components, and the other has either a mixture of both chip and leaded compo- nents (trimmers, coils, electrolytic capacitors, ICs, etc.), or leaded components only. While we believe the technical information in this manual to be correct, VERTEX STANDARD assumes no liability for damage that may occur as a result of typographical or other errors that may be present. Your cooperation in pointing out any inconsistencies in the technical information would be appreciated. ©2006 VERTEX STANDARD CO., LTD. EH023U90A Technical Supplement Specifications 2 Exploded View realignment should not be done until after the faulty component has been replaced. We recommend that servicing be performed only by authorized Vertex Standard service technicians who are experienced with the circuitry and fully equipped for repair and alignment. If a fault is suspected, con- tact the dealer from whom the transceiver was pur- chased for instructions regarding repair. Authorized Vertex Standard service technicians realign all cir- cuits and make complete performance checks to en- sure compliance with factory specifications after re- placing any faulty components. Those who do undertake any of the following align- ments are cautioned to proceed at their own risk. Problems caused by unauthorized attempts at re- alignment are not covered by the warranty policy. Also, Vertex Standard reserves the right to c
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