Servicing; Alignment - Yaesu FT-5100 Technical Supplement

Ali g nment
The Ff-5100 is carefully aligned at the fac­
tory for the specified performance across the
amateur bands. Realignment should therefore
not be necessary except in the event of a com­
ponent failure. All component replacement
and service should be performed only by an
authorized Yaesu representative, or the war­
ranty policy may be voided.
The following procedures cover the some­
times critical and tedious adjustments that are
not normally required once the transceiver has
left the factory. However, if damage occurs
and some parts subsequently be replaced, re­
alignment may be required. If a sudden prob­
lem occurs during normal operation, it is
likely due to component failure; realignment
should not be done until after the faulty com­
ponent has been replaced.
We recommend that servicing be performed
only by au tho�· '!:ed 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 pur­
chased for instructions regarding repair. Auth­
orized Yaesu service technicians realign all
circuits and make complete performance
checks to ensure compliance with specifica­
tions after replacing any faulty components.
Those who do undertake any of the follow­
ing alignments are cautioned to proceed at
their own risk. Problems caused by unauthor­
ized attempts at realignment are not covered
by the warranty policy. Also, Yaesu must re­
serve the right to change circuits and align­
ment procedures in the interest of improved
performance, without notifying owners.
Under no circumstances should any align­
ment 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 com­
ponents replaced, and the need for realign­
ment determined to be absolutely necessary.
The following test equipment (and thor­
ough familiarity with its correct use) is neces-
FT- 5100 Technical Supplement

Servicing

sary 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.
Rather, have all test equipment ready before
beginning, and follow all of the steps in a
section in the order presented.
Required Test Equipment
0 RF
Signal Generator with calibrated output
level at 450 MHz
0
Deviation Meter (linear detector)
AF Millivoltmeter
0
0
SINAD Meter
0
Inline Wattmeter with 5% accuracy at 450
MHz
0
Regulated DC Power Supply adjustable
from 10 to 17 V, 15 A
0
50-Q Dummy Load: 100 W at 450 MHz
0
Frequency Counter: 100-Hz resolution and
± 0.2-ppm accuracy at 450 MHz
AF Signal Generator
0
0 DC
Voltmeter: high impedance
0
UHF Sampling Coupler
Alignment Preparation & Precautions
A 50-Q dummy load and inline wattmeter
must be connected to the antenna jack in all
procedures that call for transmission, except
where specified otherwise. Correct alignment
is not possible with an antenna.
After completing one step, read the follow­
ing step to determine whether the same test
equipment will be required. If not, remove the
test equipment (except power supply, dummy
load and wattmeter, if connected) before pro­
ceeding.
Correct alignment requires that the ambient
temperature be the same as that of the trans­
ceiver and test equipment, and that this tern-
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