Expander Ic (Display Board; Ic1; Expander Ic (Display Board; Ic2); Expander Ic (Display Board; Ic3) - Icom IC-7800 Service Manual

3-7-34 SERIAL/PARAMETER IC
(DISPLAY BOARD; IC7)
Pin Port
number name
Outputs [TUNER] LED control signal.
7 TN1D
Low : While tuning.
Outputs [TUNER] LED control signal.
8 TN2D
Low : While the antenna is tuned.
Outputs [VOX/BKIN] LED control
signal.
9 VOXD
Low : While using the VOX/break-in
Outputs [AGC VR] LED for main band
control signal.
10 MAGD
Low : When setting the AGC with
Outputs [NR] LED control signal.
Low : When the noise reduction is
11 MNRD
Outputs [NB] LED control signal.
Low : When the noise blanker is
12 MNBD
Outputs [AGC VR] LED control signal.
Low : When setting the AGC with
13 SAGD
Outputs [NR] LED control signal.
Low : When the noise reduction is
14 SNRD
Outputs [NB] LED control signal.
Low : When the noise blanker is
15 SNBD
Outputs CF memory card accessing
indicator control signal.
Low : W h e n t h e t r a n s c e i v e r
16 CFBD
Outputs [POWER] LED control signal.
Low : While the main power is ON
17 STBD
Description
function.
[AGC] control for main band.
used in main band..
used in main band.
[AGC] control for sub band.
used in sub band.
used in sub band.
reading/writing data from/to
the CF memory card.
and the transceiver's power
is OFF.

3-7-35 EXPANDER IC (DISPLAY BOARD; IC1)

Pin Port
number name
1 MAGL
2 SAGL
4 SSQL
5 MSQL
12 DELL
13 MICL
14 PWRL
15 KYSL

3-7-36 EXPANDER IC (DISPLAY BOARD; IC2)

Pin Port
number name
1 MAFL
2 SAFL
4 SRFL
5 MRFL
12 SNBL
13 MNRL
14 MNBL
15 SNRL

3-7-37 EXPANDER IC (DISPLAY BOARD; IC3)

Pin Port
number name
1 AVXL
2 BRIL
4 MDGL
5 CNTL
12 VOXL
13 MONL
14 CMPL
15 DRVL
3 - 26
Description
Input port for [AGC] control signal for
main band.
Input port for [AGC] control signal for
sub band.
Input port for [SQL] control signal for
sub band.
Input port for [SQL] control signal for
main band.
Input port for [DELAY] control signal.
Input port for [MIC] control signal.
Input port for [RF] control signal.
Input port for [KEY SPEED] control
signal.
Description
Input port for [AF] control for main
band signal.
Input port for [AF] control for sub
band signal.
Input port for [RF] control for sub
band signal.
Input port for [RF] control for main
band signal.
Input port for [NB] control for sub
band signal.
Input port for [NR] control for main
band signal.
Input port for [NB] control for main
band signal.
Input port for [NR] control for sub
band signal.
Description
Input port for [ANTI VOX] control
signal.
Input port for [BRIGHT] control signal.
Input port for [DIGISEL] control for
main band signal.
Input port for [CONTRAST] control
signal.
Input port for [VOX GAIN] control
signal.
Input port for [MONI GAIN] control
signal.
Input port for [COMP] control signal.
Input port for [DRIVE] control signal.