4 - 5
Pin
NO.
Port name
Description
71
DSC
Input port for the [DSC] key (LOGIC BOARD; S7).
Low: [DSC] key is pushed.
72
PA
Input port for the [PA] key (LOGIC BOARD; S6).
Low: [PA] key is pushed.
73
CH/WX
Input por t for the [CH/WX] key (LOGIC
BOARD; S5).
Low: [CH/WX] key is pushed.
74
SCAN
Input port for the [SCAN] key (LOGIC BOARD; S4).
Low: [SCAN] key is pushed.
75
CH16
Input port for the [16] key (LOGIC BOARD; S3).
Low: [16] key is pushed.
76
DOWN
Input port for the [
Z
] key (LOGIC BOARD; S2).
Low:
[
Z
] key is pushed.
77
UP
Input port for the [
Y
] key (LOGIC BOARD; S1).
Low:
[
Y
] key is pushed.
138
DIM
Outputs dimmer control signal to the LCD control
circuit (LOGIC BOARD; Q2, Q3).
139
BEEP
Outputs beep signal to the AF amplifi er (IC9, pin 1).
141
DS/BPF
• While transmitting:
Outputs DSC encode signal as "DSENC"
to the LPF (IC8, pin 5) via the buffer amplifi er
(LOGIC BOARD; IC5, pins 1, 3).
• While receiving:
Outputs tuning signal as "BPFV" to the
tunable BPFs (D25–D28) via buffer amplifi er
(LOGIC BOARD; IC5, pins 5, 7).
4-7 PORT ALLOCATIONS (continued)
Summary of Contents for IC-M422
Page 1: ...3 26 5 6 2 42 3 6 2 iC m422 ...
Page 6: ...2 1 SECTION 2 INSIDE VIEWS FRONT UNIT MAIN UNIT ...
Page 23: ...7 2 IC M422 sm indd 9 10 4 21 2005 1 01 32 PM ...
Page 24: ...8 1 SECTION 8 SEMICONDUCTOR INFORMATION TRANSISTOR AND FET S DIODES ...
Page 29: ...10 1 SECTION 10 BLOCK DIAGRAM IC M422 sm indd 21 22 4 21 2005 1 01 39 PM ...
Page 32: ...11 3 11 2 LOGIC BOARD IC M422 sm indd 27 28 4 21 2005 1 01 44 PM ...
Page 35: ...S 14131MZ C1 2005 Icom Inc ...