Icom IC-M601 Service Manual page 16

4-7-3 CPU (LOGIC BOARD; IC1)
Pin Port
number name
Input port for PLL unlock signal from
7 UNLK the PLL IC (MAIN unit; IC12, pin 7).
High : While PLL is unlocked.
I/O port for the data signals to the
25 EDATA
EEPROM (IC4, pin 5).
Outputs a clock signal to the EEP-
28 ECK
ROM (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.
39 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-134/1).
I/O port for the communicating signal
64 DATAH1M from the microphone (HM-134/1) 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
74 OPTIN (UT-112) detecting signal.
Low : While UT-112 is connecting.
Outputs RX muting signal.
91 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
95 H/L or Low) select signal.
Low : While Low power is selected.
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 detecting
signal.
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.
Description
Pin Port
number name
107 TEMP
DIAL1–
111–114
DIAL4
115 PTT
116 HANG
117 DSC
120 SCON
121 OPSTB
124 DASTB
125 PSTB
126 DATAH2M
127 DATAMH2
4 - 7
Description
Input port for the indide temperature
detecting signal.
Input ports for the dial data signals.
Input port for the HM-137's PTT button
detecting signal.
Low : While PTT button is pushed.
Input port for the microphone hanger
detecting signal.
Low : The microphone on hook.
Outputs ATIS/DSC encode signals.
Outputs the voice scramber unit
(UT-112) control signal.
Outputs a strobe signal to the voice
scrambler unit (UT-112).
Outputs a strobe signal to the PLL IC
(MAIN unit; IC12, pin 3).
Outputs a strobe signal to the D/A
convertor IC (MAIN unit; IC15, pin 6).
I/O port for the communicating singal
from the microphone (HM-134/2) to
the transceiver.
I/O port for the communicating singal
from the transceiver to the micro-
phone (HM-134/2).