Yaesu FT-891 Technical Supplement

FT-891 Technical Supplement
Alignment
ALIGNMENT-3
VCO Adjustment

Connect the Digital DC voltmeter (high-Z) to
TP1009 on the MAIN Unit.

Press and hold in the
[
A
]
,
[
B
]
and
[
C
]
keys,
while turning the radio on, to enter the
alignment mode.

Referring to the table below, select the
appropriate “Alignment menu item” using the
[
MULTI
]
function knob per the chart right, and
adjust the listed components on the LOCAL
Unit for the required voltage, or confirm that
the correct voltage is present on each alignment
menu item.
Alignment Menu Item Adjust / Conrm DC voltmeter
01-04 VCO1-HIGH (TXI) Adjust L4002 4.2 V ±0.1 V
01-05 VCO1-LOW Conrm At least 0.45 V
01-06 VCO2-HIGH Adjust L4004 4.2 V ±0.1 V
01-07 VCO2-LOW Conrm At least 0.6 V
01-08 VCO3-HIGH Adjust L4006 4.2 V ±0.1 V
01-09 VCO3-LOW Conrm At least 0.25 V

Press and hold in the
[
F
]
key to save the new
setting and exit the alignment mode.
TP1009 L4002 L4004 L4006

Yaesu FT-891 Specifications

General

Brand	Yaesu
Model	FT-891
Category	Transceiver
Language	English