Yaesu VX-2500U Alignment Manual

VX-2500U Alignment, Page 1/4Vertex Standard Co., Ltd.VX-2500U AlignmentThe VX-2500U has been carefully aligned at the factory for the specified performance across thefrequency range specified for each version.Realignment should therefore not be necessary except in the event of a component failure, or alterationof version. All component replacement and service should be performed only by an authorized VertexStandard representative, or the warranty policy may be voided.The following procedures cover the sometimes critical and tedious adjustments that are not normallyrequired once the transceiver has left the factory. However, if damage occurs and some parts arereplaced, realignment may be required. If a sudden problem occurs during normal operation, it is likelydue to component failure; realignment should not be done until after the faulty component has beenreplaced.We recommend that servicing be performed only by authorized Vertex Standard service technicianswho are experienced with the circuitry and fully equipped for repair and alignment. Therefore, if a fault issuspected, contact the dealer from whom the transceiver was purchased for instructions regardingrepair. Authorized Vertex Standard service technicians realign all circuits and make completeperformance checks to ensure compliance with factory specifications after replacing any faultycomponents. Those who do undertake any of the following alignments are cautioned to proceed at theirown risk. Problems caused by unauthorized attempts at realignment are not covered by the warrantypolicy. Also, Vertex Standard must reserve the right to change circuits and alignment procedures in theinterest of improved performance, without notifying owners. Under no circumstances should anyalignment be attempted unless the normal function and operation of the transceiver are clearlyunderstood, the cause of the malfunction has been clearly pinpointed and any faulty componentsreplaced, and the need for realignment determined to be absolutely necessary. The following testequipment (and thorough familiarity with its correct use) is necessary for complete realignment.Correction of problems caused by misalignment resulting from use of improper test equipment is notcovered under the warranty policy. While most steps do not require all of the equipment listed, theinteractions of some adjustments may require that more complex adjustments be performed afterwards.Do not attempt to perform only a single step unless it is clearly isolated electrically from all other steps.Have all test equipment ready before beginning, and follow all of the steps in a section in the orderpresented.Required Test EquipmentRF signal generator: calibrated output level at 1000MHz (0dBμ =1.0μV - closed circuit)Deviation Meter (linear detector)AF MillivoltmeterSINAD MeterInline Wattmeter with 5% accuracy at 1000MHzRegulated DC Power Supply: adjustable from 10 to 17 VDC, 15A50-ohm Non-reactive Dummy Load: 100W at 1000MHzFrequency Counter: >0.1ppm accuracy at 1000MHzAF Signal GeneratorDC Voltmeter: high impedanceRF Sampling Coupler (attenuation pad)AF Dummy Load: 4Ω, 20WOscilloscopeSpectrum AnalyzerIBM PC/compatible computerVertex Standard VPL-1 programming cable and CE-** channel programming editor.

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