High Stability Crystal Unit - Icom IC-910H Instruction Manual

11
OPTION INSTALLATIONS
I CR-293

HIGH STABILITY CRYSTAL UNIT

By installing the CR-293, the total frequency stability
of the transceiver will be improved.
q Remove the bottom cover as shown in the diagram
on p. 71.
• Remove the UX-910 if you have installed it. (p. 73)
w Remove the 6 screws from the PLL shield cover,
then lift up the PLL shield cover.
e Disconnect the FFC (Flexible Flat Cable) from the
DISPLAY unit and the connection cable connectors
from J501 and J1051 on the MAIN unit.
r Remove the 5 screws from the PLL unit, then lift up
the PLL unit.
74
PLL shield
cover
From The N3UJJ.COM Document Library From The N3UJJ.COM Document Library
t Unsolder the original reference crystal, then remove
it.
• The original reference crystal unit is soldered at both top
and bottom sides of the PCB (Printed Circuit Board).
Unsolder the
CR-293
original
crystal.
Flexible flat cable
y Install the CR-293 and solder the leads.
u Return the PLL unit, PLL shield cover and bottom
cover to their original positions.
Original crystal
J501
J1051
Original crystal soldering point
CR-293 soldering
points