Icom IC-775 Maintenance Manual page 5

CR-282 HIGH-STABILITY CRYSTAL UNIT INSTALLATION
By replacing the original crystal unit with this
unit, the total frequency stability of the trans-
ceiver will be improved.
CR-282 frequency stability:
+ 0.5 ppm
(—30°C to +60 °C; —22°F to +140°F) Ribbon cable
@ Remove the top and bottom covers as
described on the first page.
(2) Remove 10 screws from the PLL unit and
the ribbon cable from J11; then turn over
the PLL unit to see the reverse side. (Fig.
1)
@) Unsolder the leads of the installed crystal,
then remove the crystal.
- Use a desoldering braid.
(4) Unsolder the 4 positions on the PLL unit
where the CR-282 will be installed.
©) Install the CR-282 in the PLL unit, paying
attention to orientation.
- Symbols on the bottom of the CR-282 must
be identically matched with symbols on the
P.C. board.
6) Bend the leads of the CR-282 at the foil
side of the P.C. board and solder them as
shown in figure 2 at right.
(7) Trim the leads even with the solder points.
Replace the PLL unit, ribbon cable and
covers.
After changing the crystal unit, frequency
adjustment is necessary with L4 on the PLL
unit.
-Ask your Icom Dealer or Icom Service
Center for details.
NOTE: The CR-282 is an oven-heat-type
crystal unit, and the specified frequency stabil-
ity described above is guaranteed 1 min. after
power ON.