Other Adjustments - Icom IC-725 Instruction Manual

(3) RIT CONTROL
• ADJUSTMENT POSITION
(4) SCAN FUNCTION
e FRONT PANEL REMOVAL
Insert a diode as shown
in the diagram at left.
(b) BFO
The BFO adjustment requires an accurate frequency
counter (less than +1 ppm).
Connect the frequency counter to R266 on the MAIN
UNIT. See p. 31 for the exact location.
Make the adjustments shown in the table at right in
numerical order.
(6) OTHER ADJUSTMENTS
MAINTENANCE AND ADJUSTMENT a
1) Rotate the [RIT] control to the center position and
turn OFF the RIT function if it is turned ON.
2) Receive WWV or another signal emitted as a single
tone from the speaker while in LSB, USB or CW mode.
3) Push the [RIT] switch to turn ON the RIT function
and adjust R70 on the PLL UNIT as shown at left to
the same tone pitch as that received.
4) Turn OFF and ON the RIT function to compare two
tone pitches and adjust R70 until both tone pitches
are the same.
By inserting a silicon diode (sold separately) in the
position indicated, the following functions can be
changed:
DEFAULT
Faster scan speed Slower scan speed
with mic with mic
[UP] /[DOWN] [UP] /[DOWN]
1) Unscrew the 6 screws and remove the front panel
from the transceiver body.
2) Diode leads should be bent and cut before inserting
them into the P.C. board.
3) Insert a diode. Make sure it is inserted in the proper
direction and in the desired position.
4) Solder leads.
| | MODE | FREQUENCY | ADJUSTMENT
USB
transmit
LSB 9.01000 MHz
receive
[e| Aw | посета | 7
See pgs. 31 and 32 for information regarding other
adjustments.
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