4 - 6
Pin
number
Port
name
Description
37
NOIS
Input port for the noise signal from
the FM IF IC (IC3, pin 13).
38
PWRSW
Input port for the [VOL] control (VR
UNIT; R1).
Low:
While power is ON.
39
DDST
Input port for the decodedDTMF sig-
nals from the DTMF decoder IC (IC300,
pin 11).
40
CIRQ
Inputs offering signal from the optional
unit and DSP unit.
Low: Offering signal is output.
41
PWRO
Outputs control signal for the power
switch circuit (Q309, Q310).
High: Power ON.
43
SENC
Outputs single tone encode signal.
44
BEEP
Outputs beep audio signals.
45
SDEC
Input port for single tone decode sig-
nal from the base band IC (IC301,
pin 1).
46
CDEC
Input port for CTCSS/DTCS signal
from the LPF (IC12, pin 7).
47
ULCK
Input port for the PLL unlock signal.
Low: The PLL circuit is unlocked.
48
BATV
Input port for the connected battery pack
for the low battery voltage detection.
Low: The battery voltage is low.
49
LVIN
Input port for the PLL lock voltage.
50
RSSI
Input port for the "RSSI" signal from
the FM IF IC (IC3, pin 12).
51
TEMP/
OPTV
• Input port for the transceiver’s internal
temperature detecting signal.
High:
Internal
temperature is high.
• Input port for the optional unit detecting
signal.
High: While connecting optional unit
to the multiconnector.
55
SIDE1
Input port for [UP] switch (MAIN UNIT; S1).
Low:
While [UP] switch is pushed.
68
DAST
Outputs strobe signals to the D/A
converter (IC303, pin 6).
69
DSDA
I/O port for data signal to the D/A con-
verter (IC310, pin 6).
72
SPCON
Outputs "SPCON" signal.
Low:
Audio output.
78
MTCK
Input port for transmitting MSK clock
signal from the base band IC (IC301,
pin 9).
79
KR
Input port for key matrix.
Low:
While any of key on the 10-keypad
(including [P0]–[P3]) is pushed.
80
FSDA
I/O port for the serial data signal for
the expander (FRONT UNIT; IC2).
81
FSCL
Outputs clock signal to the expander
(FRONT UNIT; IC2).
88
SIDE2
Input port for [DOWN] switch (MAIN UNIT;
S2).
Low:
While [DOWN] switch is pushed.
Pin
number
Port
name
Description
89–91
CENC0–
CENC2
Output the CTCSS/DTCS signals.
92
SIDE3
Input port for [MONITOR] switch (MAIN
UNIT; S4).
Low:
While [MONITOR] switch is pushed.
93
MTDT
Outputs the MSK data to the base
band IC (IC301, pin 10).
94
MDIR
Outputs serial data control signal to
the base band IC (IC301, pin 14 ).
95
MDIO
I/O port for the serial data signals
from/to the base band IC (IC301,
pin 11).
96
MSCK
Outputs clock signal for the base
band IC (IC301, pin 13).
97
PMFM
Outputs the the FM/PM switch (IC302,
pin 11) control signal.
High:
While PM is selected.
98
ESDA
I/O port for data signals from/to the
EEPROM (IC308, pin 5).
99
ESCL
Outputs clock signal to the EEPROM
(IC308, pin 6).
100
CODE8 Output port for "CODE8" signal.
4-6-2 D/A CONVERTER (MAIN UNIT; IC303)
Pin
number
Port
name
Description
2
SQL
Outputs AF signals to the squelch cir-
cuit (IC3, pin 8).
3
MOD
Outputs modulation signals to the
modulation circuit (D8).
10
TENC
Outputs CTCSS/DTCS signals.
11
BAL
Outputs deviation balance control signal.
14
BEPV
Outputs beep audio signals to the
speaker via the AF amplifi er (FRONT
UNIT; IC201).
15
SIGNAL
Outputs AF signals to the speaker via
the AF amplifi ers (FRONT UNIT; IC201).
22
TONE
Outputs single tone signal.
23
REF
Outputs reference oscillator control signal.
4-6-3 D/A CONVERTER (MAIN UNIT; IC310)
Pin
number
Port
name
Description
1
T1
Outputs the bandpass filters (D18,
D19) tuning signal.
2
T2
• While receiving:
Outputs the bandpass fi lters (D15, D16)
tuning signal.
• While transmitting:
Outputs the TX power control signal
which selects TX output power of HIGH
or LOW. The output signal is applied to
the ALC amplifi er (IC5, pin 1).
3
TXLVA
Outputs TX VCO lock voltage.
4
RXLVA
Outputs RX VCO lock voltage.
4-6-1 CPU (continued)
Summary of Contents for IC-F70DS
Page 1: ...SERVICE MANUAL VHF TRANSCEIVER ...
Page 42: ...S 14124HZ C1 2005 Icom Inc ...
