Tune Up

FCC ID: K66VR-5000

Parts List/Tune Up Info

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FCCID_105049

K66VR-5000̲Alignment.doc 1/3

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

Yaesu Musen Co．，Ltd.,

K66VR-5000̲Alignment.doc 2/3

Alignment Preparation & Precautions

Correct alignment requires that the ambient temperature be the same as that of the
receiver and test equipment, and that this temperature be held constant between 20
and 30 C (68 86F). When the receiver is brought into the shop from hot or cold air it
should be allowed some time for thermal equalization with the environment before
alignment. If possible, alignments should be made with oscillator shields and circuit
boards firmly affixed in place. Also, the test equipment must be thoroughly warmed up
before beginning.

Note: Signal levels in dB referred to in this procedure are based on 0 dBu = 0.5
uV(closed circuit).

PLL

Set up the test equipment as shown for alignment.
Maintain the supply voltage at 13.8V DC for all steps.

PLL VCV (Main VCO)
1) Connect the positive lead of the DC voltmeter to the test point TP2011(VCV) on the
RF Unit, as indicated in the figure, and the negative lead to chassis ground.
2) Set the receiver to the 312.900 MHz, and adjust coil L2076 on the Unit for 7 V on
the voltmeter.
3) Next tune to 1.000 MHz and confirm about 1.0 V on the voltmeter.
4) Set the receiver to the 621.900 MHz, and adjust coil L2098 on the Unit for 7 V on
the voltmeter.
5) Next tune to 313.000 MHz and confirm about 1.0 V on the voltmeter.

PLL VCV (Sub VCO)
1) Connect the positive lead of the DC voltmeter to the test point TP2010(VCV) on the
RF Unit, as indicated in the figure, and the negative lead to chassis ground.
2) Set the receiver to the 2599.900 MHz, and adjust coil L2053 on the Unit for 6.5 V on
the voltmeter.
3) Next tune to 4.900 MHz and confirm about 2.0 V on the voltmeter.

PLL Reference Frequency
The frequency counter connected to J2010, and while tuned to 1.000 MHz, and
adjust TC2001 on the RF Unit, if necessary, so the counter frequency is within 100 Hz
of 568.245 MHz.

Receiver

Set up the test equipment as shown below for receiver alignment.
Interstage Transformers

1) While tuned to 101.000 MHz ,and the RF signal generator turned to the same
frequency, set the generator for ±3.5 kHz deviation with 1kHz tone modulation,and
set the output level for 10 dBuV at the antenna jack.
2) Adjust CV3001 & CV3002 on the IF Unit for optimum SINAD,reducing the signal

Yaesu Musen Co．，Ltd.,

Document Created: 2019-10-23 17:10:45
Document Modified: 2019-10-23 17:10:45

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