Alignment; Required Test Equipment - Yaesu FTM-400DR/DE Technical Supplement

Introduction and Precautions
The FTM-400DR/FTM-400DE has been carefully
aligned at the factory for performance across the
specified amateur bands. 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 crit-
ical and tedious adjustments that are not normally
required once the transceiver has left the factory.
However, if damage occurs and some parts are re-
placed, realignment may be required. If a sudden
problem occurs during normal operation, it is like-
ly 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 trans-
ceiver was purchased for instructions regarding re-
pair. 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 pol-
icy. 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 opera-
tion of the transceiver are clearly understood, the
cause of the malfunction has been clearly pinpoint-
ed and any faulty components replaced, and the
need for realignment determined to be absolutely
necessary.
Important Notice
Do not adjust the alignment menus that are
not mentioned in this manual.

Required Test Equipment

 RF Signal Generator with calibrated output level
at 1 GHz
 Deviation Meter (linear detector)
 In-line Wattmeter with 5% accuracy at 1 GHz
 50-ohm, 100-W RF Dummy Load
 8-ohm AF Dummy Load
 Regulated DC Power Supply adjustable from
11.5 to 16 V DC, 15 A
 Frequency Counter: 0.2-ppm accuracy at
1 GHz
 AF Signal Generator
 AC Voltmeter
 DC Voltmeter: high impedance
 VHF/UHF Sampling Coupler
 SINAD Meter

ALIGNMENT-1

Alignment
FTM-400DR/DE Technical Supplement