Yaesu FT-7100M, Technical Supplement

Page: 9 / 68

9
Alignment
Required Test Equipment
The following test equipment (and thorough familiar-
ity with its correct use) is necessary for complete realign-
ment. Correction of problems caused by misalignment
resulting from use of improper test equipment is not cov-
ered 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 be-
ginning, and follow all of the steps in a section in the or-
der presented.
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Regulated DC Power Supply: adjustable from 10 to 17
VDC, 15 A
r
RF Signal Generator with calibrated output level at 500
MHz
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Frequency Counter: ±0.1 ppm accuracy at 500 MHz
r
AF Signal Generator
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SINAD Meter
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Oscilloscope
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Spectrum Analyzer
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Deviation Meter (linear detector)
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AF Milivoltmetr
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AF Dummy Load: 4 Ohms, 5 W
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DC Voltmeter: high impedance
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Inline Wattmeter with 5% accuracy at 500 MHz
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50-Ohm non-reactive Dummy Load: 100 watts at 500
MHz
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VHF/UHF Sampling Coupler
Introduction and Precautions
The FT-7100M has been carefully aligned at the facto-
ry for the specified performance across the 144 MHz and
430 MHz amateur bands. Realignment should therefore
not be necessary except in the event of a component fail-
ure. All component replacement and service should be
performed only by an authorized VERTEX STANDARD
representative, or the warranty policy may be voided.
The following procedures cover the sometimes criti-
cal and tedious adjustments that are not normally required
once the transceiver has left the factory. However, if dam-
age 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; realign-
ment 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. Therefore, if a fault is suspected,
contact the dealer from whom the transceiver was pur-
chased for instructions regarding repair. Authorized VER-
TEX STANDARD service technicians realign all circuits
and make complete performance checks to ensure com-
pliance with factory specifications after replacing any
faulty components.
Those who do undertake any of the following align-
ments are cautioned to proceed at their own risk. Prob-
lems caused by unauthorized attempts at realignment are
not covered by the warranty policy. Also, VERTEX STAN-
DARD must reserve the right to change circuits and align-
ment procedures in the interest of improved performance,
without notifying owners.
Under no circumstances should any alignment be at-
tempted unless the normal function and operation of the
transceiver are clearly understood, the cause of the mal-
function has been clearly pinpointed and any faulty com-
ponents replaced, and the need for realignment deter-
mined to be absolutely necessary.