![background image](http://html.mh-extra.com/html/icom/ic-7800/ic-7800_service-manual-addendum_612348362.webp)
3 - 18
3-7-4 MAIN CPU1 (LOGIC UNIT; IC103 )
1
TMS
Input port for the mode signal.
2
TCK
Input port for the clock signal.
5
TDI
Input port for the data signal.
CS0
CS1
6–10
CS4
Output chip select signals.
CS5
CS6
11
BS
Outputs bus starting signal.
12
WE0/REG Outputs D7–D0 select signal.
13
WE1
Outputs D15–D8 select signal.
14
D0
I/O port for the data signal.
19–28, D1–D10,
I/O ports for the data signals.
31–35
D11–D15
36
CAS0/DQM0 Outputs D7–D0 select signal.
37
CAS1/DQM1 Outputs D15–D8 select signal.
38
RD/WR
Outputs read/write control signal.
39
CKIO
Outputs clock signal.
49,
CS2,
Output chip select signals.
50
CS3
51–54,
A0–A3,
57–66,
A4–A13, Output address signals.
69–72
A14–A17
73
CAS2/DQM2 Outputs D23–D16 select signal.
74
CAS3/DQM3 Outputs D31–D24 select signal.
75–78, D16–D19,
83–92, D20–D29, I/O ports for the data signals.
95, 96 D30, D31
99–104, A18–A23,
Output address signals.
107, 108 A24, A25
109
WE2/ICIORD Outputs D23–D16 select signal.
110
WE3/ICIOWR Outputs D31–D24 select signal.
113
SLEEP
Input port for the sleep signal.
125
PCICLK
Input port for the clock signal from the
buffer amplifier (IC106).
128
SERR
I/O port for the system error signal.
129, 130, AD31, AD30,
I/O ports for the buffer amplifier
133–138, AD29–AD24,
(IC106) address signals.
140–142, AD23–AD21,
147–151 AD20–AD16
156
DEVSEL I/O port for the device selecting signal.
164–168, AD15–AD11,
171–173, AD10–AD8, I/O ports for the buffer amplifier
177–182, AD7–AD2,
(IC106) address signals.
185, 186 AD1, AD0
187–190 IRL0–IRL3 Input ports for the interrupt signals.
193
XTAL2
Output port for the crystal oscillator.
194
EXTAL2
Input port for the crystal oscillator sig-
nal.
197
CA
Input port for the hardware stand-by
signal.
198,
RESET,
Input ports for the reset signal.
199
TRST
200
MRESET Input port for the manual reset signal.
206
TXD
Outputs the buffer amplifier (IC106)
data signal.
212
RXD
Input port for the buffer amplifier
(IC106) data signal.
215
SCK
I/O port for the buffer amplifier (IC106)
clock signal.
246
TDO
Outputs the data signal.
255
XTAL
Output port for the crystal oscillator.
256
EXTAL
Input port for the crystal oscillator sig-
nal.
Pin
Port
Description
number
name
Pin
Port
Description
number
name
3-7-5 RELAY CONTROLLER (CTRL BOARD; IC55)
4
LPF2
Outputs the low-pass filter (2–4 MHz)
select signal.
5
LPF8
Outputs the low-pass filter (22–30 MHz)
select signal.
6
LPF4
Outputs the low-pass filter (6.9–10 MHz)
select signal.
7
LPF7
Outputs the low-pass filter (18–22 MHz)
select signal.
11
LPF5
Outputs the low-pass filter (10–14 MHz)
select signal.
12
LPF9
Outputs the low-pass filter (30–60 MHz)
select signal.
13
LPF6
Outputs the low-pass filter (14–18 MHz)
select signal.
14
LPF3
Outputs the low-pass filter (4–6.9 MHz)
select signal.
Pin
Port
Description
number
name
3-7-6 RELAY CONTROLLER (CTRL BOARD; IC56)
4
LPF1
Outputs the low-pass filter (0.03–2 MHz)
select signal.
5
ANT4R
Outputs the antenna ([ANT 4]; RX
only) select signal for main band.
Pin
Port
Description
number
name
Summary of Contents for IC-7800
Page 1: ...SERVICE MANUAL ADDENDUM CONTENTS PARTS LIST 1 BOARD LAYOUTS 65 VOLTAGE DIAGRAM 67 Dec 2009 ...
Page 79: ...SERVICE MANUAL ADDENDUM CONTENTS PARTS LIST 1 BOARD LAYOUTS 60 VOLTAGE DIAGRAM 64 Feb 2009 ...
Page 157: ...SERVICE MANUAL ADDENDUM CONTENTS PARTS LIST 1 BOARD LAYOUTS 57 VOLTAGE DIAGRAM 59 Aug 2008 ...
Page 245: ...SERVICE MANUAL ADDENDUM CONTENTS PARTS LIST 1 BOARD LAYOUTS 57 VOLTAGE DIAGRAM 59 Jul 2008 ...
Page 333: ...THE TRANSCEIVER i7800 SERVICE MANUAL S 14015HZ C1 2 Mar 2006 ...
Page 555: ...1 1 32 Kamiminami Hirano ku Osaka 547 0003 Japan S 14015HZ C1 2 C 2004 2006 Icom Inc ...