Icom IC-R8500 Service Manual

5-3
RECEIVER ADJUSTMENT
ADJUSTMENT ADJUSTMENT CONDITIONS
MEASUREMENT
VALUE
ADJUSTMENT
POINT
UNIT LOCATION UNIT ADJUST
PIN ATT
1
•
Displayed freq.
: 14.10000 MHz
•
Mode ; USB
•
Receiving
RF-A Connect a
digital mulli-
meter to CPI
.
1.7 V
RF-A
R63
HF
SENSITIVITY
•
Displayed freq.
:
14.09850 MHz
•
Mode : USB
*[10dB] :ON
•
[AGC] ; Fast
•
Conned an
SSQ
to
(he
antenna connec*
tor lor 0.1
-
30 MHz
(50 0
ANT)
and
set
as:
Frequency : 14.10000 MHz
Level :
0.56
uV(-
112 dBm)
Modulation
:
OFF
•
Receiving
Rear
panel
Connect an AC
volt-
meter
to the
(EXT SP]
with an
80
load.
Maximum
oulpul
level
RF-A Adjust In
sequence
L65, Lea
L63, L62
2
•
Set an SSG
output level:
OFF
•
Receiving
Minimum output
level
R77
1ST MIXER
BIAS
VOLTAGE
1
•
Otsplaycd freq. ;
173.00000
MHz
•
Disconnect
J4.
•
Receiving
RF-B Connect a digital multi-
meter
to
both terminals
of R91.
0.2 V RFB
RI09
HPF SHIFT
VOLTAGE
1
•
Displayed freq.
:
1300.00000
MHz
•
Mode :FM
•
Receiving
CONV Conned a
digital multi-
melerto
CP2.
14.5 V CONV RS5
2
•
Displayed freq.
:
1
100.00000 MHz
•
Receiving
3.0V +1.0V
Verify
NOTE: Before adjusting
WFM SENSITIVITY.
5-4
RF-B
6PF TUNED VOLTAGE ADJUSTMENT
must be
performed.
WFM
SENSITIVITY
•
Displayed freq.
:
173.02000
MHz
•
Mode
: WFM
•
Connect
an SSG to the
antenna
connec-
tor for 30-2000
MHz
and set
as:
Level
; 1
mV* (-47 dBm)
Modulation
: 1
kHz
Deviation
:±75kHz
•
Receiving
MAIN Connect a
digital
multi-
meter
to
CPI.
2.5 V MAIN C37
2
3
•
Set
an SSG level
as: 3.2 uV*
(
-
97
dBm)
•
Receiving
Connect
a
digital multi-
meter to CP4.
Minimum voltage
Adjust L7.
L8, L9. L10
repeatedly
Connect a digital
multi-
meter to CPI
.
2.5
V
C37
FM
SENSITIVITY
•
Displayed
freq.
: 173.02000 MHz
•
Mode ; FM
•
Connect an
SSG to the antenna connec-
tor lor 30-2000
MHz and
set as:
Level
:3.2uV*(-97dBm)
Modulaiion . 1 kHz
Deviation
;
z
5 kHz
•
Receiving
Front
panel
S-meter Maximum
level
MAIN Adjust in
repeatedly
L14, L17
L22. L25
126
1ST
IF
NOTCH
•
Displayed
freq. :
78B.60000 MHz
•
Mode
;
FM
•
Connect
an SSQ
to ihe antenna connec-
tor
tor
30-2000
MHz and set
as:
Frequony
: 810.00000 MHz
Level
: 32
mV* (-17
dBm)
Modulation
:
OFF
•
Receiving
Front
panel
S-meter
Minimum level MIX LI 5
*This output level cl
a standard
signal
generator
(S$Q)
i$ Indicated
as
SSG's open circuit.
5-3

Icom IC-R8500 Specifications

General

Brand	Icom
Model	IC-R8500
Category	Receiver
Language	English