Icom IC-730 Maintenance Manual page 23

3. CHECKING THE OPERATION
(1) While performing the installation, set the marker switch of
the unit to the "OFF" position and the marker frequency
switch in the "100KHz" position.
(2) Connect the plug of the internal speaker on the top cover
to the original connector, or an external speaker to the
external speaker jack on the rear panel.
(3) Make sure the power switch of your IC-730 is turned OFF.
Set the other controls and switches in the receive mode
according to the manual of IC·730. Then connect the power
plug to the power socket of the IC-730.
(4) Turn the power switch of the IC-730 ON, and the set
operates in the receive mode.
(5) Set the marker switch of this unit to the "ON" position and
the marker frequency switch in the " 100KHz" position. Then
turn the tuning control knob, and you can receive a strong
signal on every 100KHz.
(6) Set the marker frequency switch in the "25KHz" position,
and you can also receive a strong signal on every 25KHz.
These are the complete operations of the unit.
(7) When the operations are performed, unplug the power
cord again and replace the speaker connector and covers.
4. CALIBRATION OF THE MARKER
(1) Set the MODE Switch in the "AM" position and BAND
Switch in the "10MHz" position, then turn ON the POWER
Switch.
(2) The FREQUENCY DISPLAY will show "10.100.0". Turn
the TUNING CONTROL knob to tune to WWV (or other
standard frequency station) on 10.000MHz. Set the TUNING
RATE Switch in 10Hz steps for fine tuning.
(3) Turn ON the marker switch on the unit and adjust the
FREQUENCY ADJUST trimmer on the unit to make "zero
beat" with WWV.
(4) When you have performed the calibration, turn OFF the
marker switch.
5. CALIBRATION OF THE TRANSCEIVER
(1) Set the MODE Switch in the CW position and the TUNING
RATE Switch in 100Hz position. Tune to the lower band edge
of the band you want to calibrate, as an example, "21.000.0".
(2) Ground the Key jack on the rear panel so that the CW
sidetone becomes audible. (Don't transmit.)
(3) Turn ON the marker switch, and adjust the FREQUENCY
SET control of the set, so that the two tones are of the same
pitch (In zero beat).
(4) The frequency calibration is sufficient on a frequency on
the same band, but it is required for each band.
6 – 3 – 2 INSTALLATION OF THE IC-EX203
(CW AUDIO FILTER UNIT)
1. PARTS LAYOUT
2. INSTALLATION PROCEDURE
(1) Loosen two retaining screws of the upper sub-chassis,
and turn the sub-chassis around hinges on the other end as
shown in the photo.
(2) Loosen the front side screw of the shaft coupling sleeve of
the band switch and remove the shaft sliding toward front
side.
Install this unit to the position shown in the photo, using
screws that have been attached.
6 – 3