121
FT-857 Operating Manual
O
PTIONAL
H
IGH
S
TABILITY
R
EFERENCE
O
SCILLATOR
TCXO-9
The
TCXO-9
provides high stability over a wide range of ambient temperatures, so as to
enhance digital-mode operating.
1. Turn the transceiver’s power off by pressing and holding in the
POWER
switch for one
second, then disconnect the DC cable from the
INPUT
jack on the rear panel of the
transceiver.
2. Referring to Figure 1, remove the seven screws affixing the top cover of the transceiver
then disconnect the speaker’s connector from the MAIN Unit.
3. Referring to Figure 2, locate the factory-installed REF UNIT on the board. Remove the
factory-installed REF UNIT from the board, then position the
TCXO-9
so that its con-
nectors are aligned with the mounting pins on the board, and push it into place.
4. Replace the top case and its seven screws (remember to replace the internal speaker’s
plug).
5.
TCXO-9
installation is now complete. Connect the DC cable to the
INPUT
jack.
I
NSTALLATION
OF
O
PTIONAL
A
CCESSORIES
BAND
DWN
UP
TX/BUSY
DSP
MODE
BAND
DWN
UP
TX/BUSY
DSP
MODE
TCXO-9
Mounting Location
Figure 1
Figure 2
MAIN UNIT
TCXO-9