Icom IC-R8500 Service Manual page 17
Communications receiver
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Also See for IC-R8500:
- Service manual addendum (286 pages) ,
- Service manual (101 pages) ,
- Instruction manual (48 pages)
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MAIN
unit,
IC18
Pin
number
Port
name
Description
4
WFM
Outputs
WFM
mode
select
signal.
5
FM
Outputs
FM
mode
select
signal.
6
/WFM
Outputs
non-WFM mode
select
signal.
7
SSB
Outputs
SSB mode
select
signal.
11
FIL3
Outputs 15
kHz bandpass
filter
select
signal.
12
FIL2
Outputs
6
KHz
bandpass
filter
select
signal.
13
Fill
Outputs
2.4
kHz bandpass
filter
select
signal.
14
AM
Outputs
AM
mode
select
signal.
PLL
unit,
IC1
Pin
number
Port
name
Description
11
RST
:
Outputs
reset
signal.
PLL
unit,
IC2
Pin
number
Port
name
Description
4
STRB
Outputs
strobe
signal tor
the
expander
IC(ICI).
11
STDB
Outputs
strobe
signal
tor
the
BFO
circuit
(IC13).
12
STP2
Outputs
strobe
signal
for
the
2nd
LO
PLL
1C (tCiO).
13
STDA
Outputs
strobe
signal
for
the
1st
LO
PLL
circuit
(IC3).
14
STPI
Outputs
strobe
signal
for
the
1
st
LO
PLL
1C
(ICS).
RF-A
unit.
IC3
Pin
number
Port
name
Description
4
B1
Outputs
0.1 to
0.49999
MHz
bandpass
filter
select signal.
5
B2
Outputs
0.5
to
1.59999
MHz
bandpass
filler
select signal.
6
B3
Outputs
1.6
to
1.99999
MHz
bandpass
filter
select signal.
7
B4
Outputs
2.0
to
3.99999
MHz
bandpass
filter
select
signal.
11
B5
Outputs
4.0
to
7.99999
MHz
bandpass
filter
select
signal.
12
B6
Outputs
8.0
to
10.99999
MHz
bandpass
filter
select
signal.
13
B7
Outputs
1
1
.0 to
1
4.99999
MHz
bandpass
filter
select
signal.
14
B8
Outputs
15.0
to
21
.99999
MHz
bandpass
filter
select
signal.
RF-A
unit,
IC4
Pin
number
Port
name
Description
4
ANSW
Outputs [ANT2]
select
signal.
5
AT20
Outputs
20
dB
attenuator
control
signal.
6
B9
Outputs 22.0
to
29.99999
MHz
bandpass
filter
select
signal.
7
PREF
Outputs
1
0
dB
attenuator
control
signal.
"High":
While
[10
dB]
Is
ON.
13
HF5
Outputs
HF5
V
regulator
circuit
control
signal.
14
PREO
Outputs
1
0
dB
attenuator
control
signal.
•'High":
White
[10
dB]
is
OFF.
CONV
unit,
IC10
Pin
number
Port
name
Description
4
ICON
Outputs
switching relay control
signal.
"High":
While
RF
signals
above
1025
MHz
are
received.
5
5MON
Outputs
divider
circuit
(IC8)
and
LPF
(L43-L45)
control signal.
"High";
While
1025-1199.99999
MHz
signals
are
received.
6
5MOF
Outputs
divider
circuit
(IC8)
and
LPF
(L47-L49)
control signal.
"High":
While
RF
signals
above
1200
MHz
are
received.
7
2ATF
Outputs
20
dB
attenuator
control
signal.
"High"
:
While
(20
dB)
is
OFF.
12
2ATN
Outputs
20
dB
attenuator
control
signal.
"High":
While
[20
dB]
is
ON.
13
1ATF
Outputs
10
dB
attenuator
control
signal.
"High":
White
(10
dB]
is
OFF.
14
1ATN
Outputs 10
dB
attenuator
control
signal.
"High":
While
(10
dB)
is
ON.
4-10
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