Yaesu FT-890 User Manual

Installing Internal Accessories
This chapter describes installation of the in-
ternal options available for the
FT-890. The ATU-
2 automatic antenna tuner and the YF-100 or
XF-455K-251-01 and YF-101 crystal filters can be
installed by removing only the bottom cover,
while installing the TCXO-3 master oscillator re-
quires removing first the bottom cover and then
the top
cover/heatsink. This chapter describes
the cover removal procedures first, followed by
the individual procedures for each option.
Proper performance with these options depends
on proper installation. If you are unsure of the
procedures after reading the following, feel free
6~ /
to ask your Yaesu dealer for help.
Cover Removal
Figure 1: Bottom Cover Removal
0 Turn the transceiver off, and disconnect all
cables.
0 Place the set upside-down on the work sur-
Figure 2: RF Unit Location
face with the rear facing you, and remove the
eight screws affixing the bottom cover (Figure
1). Then lift the bottom cover off.
If you are installing only the ATU-2, proceed
directly from here to the procedure on page 39.
0 Disconnect the light-blue-banded coaxial ca-
ble from
J2026 near the rear of the exposed RF
Unit (#I in Figure 2). If you are not installing
any crystal filters,
skip the next three steps.
0 If installing crystal filters you will need to
access the solder side of the
RF Unit. Unplug
the yellow-banded coaxial cable from
J2024
near the rear corner of the RF Unit (#2 in
Figure 2).
0 Using a small sharp tool, gently pry up on
either side of
J2011, the white plastic ribbon
cable socket near the rear left corner of the
RF
Figure 3: Ribbon Cable Connector
Unit (#3 in Figure 2), about 2 mm ('A inch),
until the ribbon cable can be removed (see
Figure
3).
0 Remove the six screws indicated in Figure 2
(one is inside the large shield housing, acces-
sible through the hole near the corner).
0 If not installing the TCXO-3, the crystal filters
can now be installed
as described on page 39.
Otherwise, continue with the following steps:
TCXO-3 Enhanced-Stability Oscillator
The 22-ppm TXCO-3 option can be installed as a
replacement for the standard
+lo-ppm crystal
oscillator.
page 36

Yaesu FT-890 Specifications

General

Brand	Yaesu
Model	FT-890
Category	Transceiver
Language	English