K66VR- 5000̲Alignment.doc
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Yaesu Musen Co．，Ltd.,
VR-5000 Alignment
The VR-5000 has been carefully aligned at the factory for the specified performance
across the amateur band.
Realignment should therefore not be necessary except in the event of a component
failure.All component replacement and service should be performed only by an
authorized Yaesu representative, or the warranty policy may be voided.
The following procedures cover the sometimes critical and tedious adjustments that
are not normally required once the transceiver has left the factory.However, if damage
occurs and some parts are replaced, realignment may be required.If a sudden problem
occurs during normal operation, it is likely due to component failure; realignment
should not be done until after the faulty component has been replaced.
We recommend that servicing be performed only by authorized Yaesu service
technicians who are experienced with the circuitry and fully equipped for repair and
alignment. Therefore, if a fault is suspected, contact the dealer from whom the
transceiver was purchased for instructions regarding repair. Authorized Yaesu service
technicians realign all circuits and make complete performance checks to ensure
compliance with factory specifications after replacing any faulty components. Those
who do undertake any of the following alignments are cautioned to proceed at their
own risk. Problems caused by unauthorized attempts at realignment are not covered
by the warranty policy. Also, Yaesu must reserve the right to change circuits and
alignment procedures in the interest of improved performance, without notifying
owners. Under no circumstances should any alignment be attempted unless the
normal function and operation of the transceiver are clearly understood, the cause of
the malfunction has been clearly pinpointed and any faulty components replaced, and
the need for realignment determined to be absolutely necessary. The following test
equipment (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 not covered under the warranty policy. While most steps do
not require all of the equipment listed, the interactions 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 order presented.
Required Test Equipment
1. RF Signal Generator with calibrated output level at 1000 MHz
2. AF Millivoltmeter
3. SINAD Meter
4. Regulated DC Power Supply: adjustable from 10 to 17 VDC, 5A
5. Frequency Counter: >0.1 ppm accuracy at 500 MHz
6. AF Signal Generator
7. DC Voltmeter: high impedance
8. AF Dummy Load: 8 ohm, 5W
9.Oscilloscope
