Icom IC-703 Service Manual page 16

(MAIN unit; IC5901)–Continued
Pin Port
number name
Outputs strobe signal to the BFO's
40 SBST
DDS IC (IC9701).
Outputs strobe signal to the DDS IC
41 PDST
(IC9001) for main loop.
Outputs strobe signal to the PLL IC
42 PMST
(IC9101) for main loop.
Outputs strobe signal to the D/A con-
43 DSTB
vertor (IC6501).
Input port for the RTTY keying signal.
FSKK High : While marking.
46
Low : While spacing.
Outputs AGC first control signal.
47 AGFS
Low : While AGC first is ON.
Outputs FM mode select signal.
49 FMS
High : While FM or FM-N is selected.
Outputs AM mode select signal.
50 ANS
High : While AM or AM-N is selected.
Outputs noise blanker control signal.
51 NBS
High : While noise blanker is ON.
Outputs detecting output select signal.
52 AFS2
High : While AM or AM-N is selected.
Outputs detecting output select signal.
AFS1
53
High : While FM or FM-N is selected.
Outputs attenuator control signal.
55 ATTS
High : While attenuator is ON.
Outputs the pre-amplifier ON/OFF
56 PROS control signal.
High : While the pre-amplifier is OFF.
Outputs the pre-amplifier ON/OFF
57 PRES control signal.
High : While the pre-amplifier is ON.
Outputs the speech compressor con-
trol signal.
58 COMS
High : While the speech compressor
Outputs 9600 bps packet mode control
signal.
59 D96S
High : While 9600bps packet mode
Outputs optional DSP unit control sig-
61 DSPS nal.
High : While the DSP unit is ON.
65 ECK Outputs the EEPROM clock signal.
66 EDT I/O port for the EEPROM data signal.
67 DRES Outputs reset signal.
Input port for the external paddle dash
72 DASK
signal.
Input port for the external paddle dot
DOTK
73
signal.
Outputs AF mute control signal.
80 AFMS
Low : While AF is muting.
Description
is ON.
is ON.
(MAIN unit; IC5901)–Continued
Pin Port
number name
85 SPS
89 VCCL
90 PSS
91 MUDL
95 CTCL
98 MSTB
99 MDT
MCK
100
3 - 10
Description
Outputs the speaker switching signal.
High : The speaker is ON.
Input port for supplied voltage detect-
ing signal.
Outputs power save control signal.
Low : While power save is ON.
Input port for the microphone
[UP]/[DWON] signal from the rear
panel.
Input port for the CTCSS signal.
Outputs strobe signal to the expander
IC (IC6101, pin 1).
Outputs serial data to the D/A conver-
tor (IC6501, pin 8) and expander IC
(PA unit; IC600, pin 8).
Outputs serial clock to the D/A conver-
tor (IC6501, pin 7) and expander IC
(PA unit; IC600, pin 7).