Expander Ic (Display Board; Ic4); Expander Ic (Display Board; Ic5) - Icom IC-7800 Service Manual

3-7-38 EXPANDER IC (DISPLAY BOARD; IC4)

Pin Port
number name
Input por t for [CLEAR], [DUAL
1 KI0
WATCH] and [SPLIT].
Input port for both main and sub
2 KI2
bands [APF/TPF].
Input port for both main and sub
4 KI3
bands [FILTER] and [PBT CLEAR].
Input port for both main and sub
5 KI1
bands [NOTCH], [RIT] and [Δ TX].
Input port for [CW PITCH] control
12 PITL
signal.
Input port for [NOTCH] control for
13 MNCL
main band signal.
Input port for [DIGI-SEL] control for
14 SDGL
sub band signal.
Input port for [NOTCH] control for sub
15 SNCL
band signal.

3-7-39 EXPANDER IC (DISPLAY BOARD; IC5)

Pin Port
number name
Input port for [ ] switches from first to
1 KI8
fourth.
Input port for [AGC VR], [NR] and [NB]
2 KI10
switches for main band.
Input port for [MONI], [TUNER] and
4 KI11
[TIMER].
Input port for [AGC VR], [NR] and [NB]
5 KI9
switches for sub band.
Input port for [ ] switches from fifth to
12 KI7
seventh.
Input port for [7 (3)], [18 (6)], [28 (9)]
13 KI4
and [F-INP (ENT)].
Input port for [3.5 (2)], [14 (5)],
14 KI5
[24 (8)] and [50 (0)].
Input port for [1.8 (1)], [10 (4)], [21 (7)]
15 KI6
and [GENE (.)].
Description
Description
3 - 27