Pll And 5 - 2 Command - Icom IC-R10 Service Manual

5-1
PLL
AND BFO ADJUSTMENT
ADJUSTMENT ADJUSTMENT CONDITIONS
MEASUREMENT
VALUE
ADJUSTMENT
UNIT
LOCATION UNIT
ADJUST
1ST
VCO
LOCK
VOLTAGE
1
•
Displayed frequency:
200
MHz
:
534
MHz
:
610
MHz
:
846
MHz
•
Receiving
MAIN
Connect a
voltmeter
(1
MQ
impedance)
to
the
check
point
LVI.
More
than
0.2
V
Verify
2
•
Displayed frequency:
533
MHz
:
609
MHz
:
845
MHz
:
895
MHz
•
Receiving
Less than
3.3
V
2ND
VCO
LOCK
VOLTAGE
1
•
Displayed frequency:
100
MHz
•
Mode
:
SSB
•
Noise Blanker
:
ON
•
Receiving
MAIN
Connect
a voltmeter
(1
MQ
impedance)
to
the
check
point 21 LV.
Less than
2.5
V
Verify
2
•
Displayed frequency:
500
MHz
•
Receiving
More
than 0.6
V
3
•
Displayed frequency: 100
MHz
•
Mode
:
SSB
•
Noise Blanker
:
ON
•
Receiving
Connect
a voltmeter
(1
MQ
impedance)
to
the check
point
22
LV.
Less than 2.5
V
4
•
Displayed frequency:
500
MHz
•
Receiving
More
than 0.6
V
1ST
REFERENCE
FREQUENCY
1
•
Displayed frequency:
Any
•
Mode
:
Any
•
Receiving
MAIN
Connect a frequency
counter
to
the check
point
REF.
10.24500
MHz
RF
C501
BFO
FREQUENCY
1 •
Displayed frequency:
144.0000
MHz
•
Mode
:
LSB
•
Receiving
LOGIC Connect a frequency
counter
to
the
check
point
CPI
.
453.500
kHz
LOGIC
R239
2
•
Mode
:
USB
•
Receiving
456.500
kHz
R243
5-1