ICOM IC-575

                                                                                        EXPANDED RF

1- REMOVE POWER AND ANTENNA.
2- REMOVE SCREWS AND OPEN THE CASE.
3- LOCATE THE LOGIC UNIT BOARD. It is located under the PA unit see speaker.
Follow the instruction used when installing the UT-34 tone squelch unit.
4- ATTACH TWO DIODES AS SHOWN. ( Any standard diodes ).
D-10 to 3rd pin and R-49 to D-15.
5- REASSEMBLE THE RADIO.
6 RESET THE MICROPROCESSOR (Press and hold [ M-CL ] and turn power ON.

 ICOM    IC-275   Tun
 

TUNING STEPS CHANGE FOR ICOM IC-575

The FM-Step selectmatrix use these diodes on the front unit:
(type 1SS53) D41, D42, D43, D44, (D45), D46

Note: diode D45 is not present but solder holes exist for it on the board
just between D44 e D46

installed diodes are marked with X :

(*) (*)
D41 D42 D43 D44 D45 D46 D48 Steps DB4 DB5 DB6 DB7
. . . . . . . 10.0 Hz
. . . X . . . 100.0 Hz 1 0 0 0
. X . . . . . 1.0 KHz 0 0 1 0
X . X . 5.0 KHz 1 0 1 0
. . . . X . . 10.0 KHz 0 1 0 0
. . . (*) X X . 12.5 KHz (*) 1 1 0
. . . . . . X 25.0 KHz 0 0 0 1
X . X . . . . 1.0 MHz 0 1 0 1


(*) To set a step of 12.5 KHz in FM mode (TS button off) it is not
necessary disconnect the diode D44, just insert the diode D45
(IN4148 or similar) near D44 and "voil les jeux sont faits".
Unscrew the two lateral screws and unlock the front panel.
Remove also all the connectors of the front board and after that
unscrew ALL the screws of the metallic shield covering the front board.
It seems too much complicated insert the diodes from the component
side of the front board, so it is better insert D45 from the solder side.
 

 IC-575

28/50MHZ ALL MODE TRANSCEIVER


IC-575A (10W VERSION)
IC-575H (100W USA VERSION)

FREQUENCY COVERAGE:
RX: 26-56 MHZ CONTINUOUS;
TX, 28-29.7MHZ, 50-54 MHZ
FREQ RESOLUTION:
10 HZ
POWER SUPPLY
13.8V DC NEG GND OR 117V OR 220VAC
CURRENT:
IC-575A HI 5.2A; LOW 3A
IC-575H HI 20A; LOW 8.5A
O/P PWR:
SSB,CW,FM: HI IC-575A 10W, IC575H 100W
AN HI 4W 2.5W
EMISSIONS: SSB CW FM AM
SENSITIVITY:
SSB/CW: < 0.13UV FOR 10DB S/N
AM: <1UV FOR 10DB S/N
AUDIO: 2W
FEATURES:
BUILT IN P/S, PASS BAND TUNING, ADJUSTABLE IF NOTCH, SPEECH
COMPRESSOR, NOISE BLANKER, BACKLIGHT LCD READOUT, ALL MODE SQUELCH, 99
MEMORIES,4 SCAN MODES, ANY TX OFFSET.