Icom IC-M604 Service Manual page 15

4-7-3 CPU (LOGIC BOARD; IC1)
Pin Port
number name
Input port for PLL unlock signal from
40 UNLK the PLL IC (MAIN unit; IC12, pin 7).
High : While PLL is unlocked.
I/O port for the data signals to the
41 EDATA
EEPROM (IC4, pin 5).
Outputs a clock signal to the
28 ECK
EEPROM (IC4, pin 6).
Input port for the decode signal for
34 DEC3
. channel 70 receiver.
Input port for the ATIS/DSC decode
38 DEC1
signals.
110 BEEP Outputs beep audio signals.
I/O port for the cloning data from the
58 DATAMC
transceiver.
I/O port for the cloning data to the
59 DATACM
transceiver.
I/O port for the communicating signal
63 DATAMH1 from the transceiver to the micro-
phone (HM-162/1).
I/O port for the communicating signal
64 DATAH1M from the microphone (HM-162/1) to
the transceiver.
66 DATANM I/O port for the GGA signals
69 DATAMN I/O port for the NMEA data.
Outputs a data signal to the PLL IC
70 PDATA
(MAIN unit; IC12, pin 5).
Outputs a clock signal to the PLL IC
71 PCK
(MAIN unit; IC12, pin 4).
Outputs the voice scrambler unit
6 OPTIN (UT-112) detecting signal.
Low : While UT-112 is connecting.
Outputs RX muting signal.
92 RMUTE
High : While RX signal is muting.
Outputs transmit mute signal.
93 TMUTE
High : While TX muting.
Outputs T8 regulator control signal.
94 SEND
High: While transmitting.
Output port for RF output power (High
96 H/L or Low) select signal.
Low : While Low power is selected.
Output RX attenuator control signals.
ATT level
97 ATT2C
ATT1C
98 ATT1C
ATT2C
103 WXDEC Input port for the weather alert signal.
Input port for the FM IF IC (MAIN unit;
104 SQL IC1, pin 14)'s noise amplifier detect-
ing signal.
Description
OFF ON (1) ON (2) MAX.
1 1 0 1
1 0 1 1
Pin Port
number name
Input port for the low-battery detecting
signal. Low battery indicator appears
105
LBAT
when the battery becomes less than
2.58 V
106
TXDET
Input port for transmit detecting signal.
Input port for the indide temperature
107
TEMP
detecting signal.
DIAL1–
Input ports for the dial data signals.
111–114
DIAL4
Input port for the HM-136's PTT but-
115
PTT
ton detecting signal.
Input port for the microphone hanger
26
HANG
detecting signal
117
DSC
Outputs ATIS/DSC encode signals.
Outputs the voice scramber unit
120
SCON
(UT-112) control signal.
Outputs a strobe signal to the voice
121
OPSTB
scrambler unit (UT-112).
Outputs a strobe signal to the PLL IC
124
DASTB
(MAIN unit; IC12, pin 3).
Outputs a strobe signal to the D/A
125
PSTB
convertor IC (MAIN unit; IC15, pin 6).
I/O port for the communicating singal
126
DATAH2M
from the microphone (HM-162/2) to
the transceiver.
I/O port for the communicating singal
127
DATAMH2
from the transceiver to the micro-
phone (HM-162/2).
4 - 7
Description
Low : While PTT button is pushed.
Low : The microphone on hook.