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Oct. 2008
(REPLACEMENT PAGE)
4-2 PLL ADJUSTMENT
Vdd
DRAIN
VOLTAGE
Idd
DRAIN
CURRENT
PLL LOCK
VOLTAGE
TUNE
VOLTAGE
REFERENCE
FREQUENCY
ADJUSTMENT
ADJUSTMENT
ADJUSTMENT CONDITION
MEASUREMENT
VALUE
POINT
UNIT
LOCATION
UNIT
ADJUST
1
1
2
1
2
1
1
s
Operating frequency :
118.000 MHz
s
Receiving
s
Operating frequency :
127.000 MHz
s
Transmitting
s
Operating frequency :
118.000 MHz
s
Receiving
s
Transmitting
s
Operating frequency :
118.000 MHz
s
Receiving
s
Operating frequency :
136.950 MHz
s
Connect an RF power meter or a
50
7
dummy load to the antenna
connector.
s
Transmitting
MAIN
MAIN
MAIN
MAIN
Rear
panel
Connect a digital
1) Unsolder CP5.
multi-meter to drain
terminal of Q51.
Connect a digital
multi-meter to the
check point CP2.
Connect a digital
multi-meter to the
check point CP1.
Loosely couple the
frequency counter
to the antenna con-
nector.
13.5 V
650–750 mA
–
–
–
–
0.5 V
0.5 V [A110]
0.3 V [A110EURO]
0.7 V
136.9500 MHz
MAIN
MAIN
MAIN
MAIN
MAIN
R392
R222
L41
L40
R59
X1
4-3 TRANSMITTER ADJUSTMENT
OUTPUT
POWER
MODULATION
DEPTH
HEAD SET
MODULATION
ADJUSTMENT
ADJUSTMENT
ADJUSTMENT CONDITION
MEASUREMENT
VALUE
POINT
UNIT
LOCATION
UNIT
ADJUST
1
1
2
1
s
Operating frequency :
127.000 MHz
s
No audio applied to the [MIC]
jack.
s
Transmitting
s
Operating frequecy :
127.000 MHz
s
Connect an audio generator to
the [MIC] jack and set as :
1 kHz/10 mVrms
s
Set a modulation analyzer as :
HPF
: OFF
LPF
: OFF
De-emphasis : OFF
Detector
: (P
–
P)/2
s
Pre-set R110 and R121 on the
MAIN unit to the center position.
s
Transmitting
s
Set an audio generator as:
1 kHz/1 mVrms
s
Transmitting
s
Operating frequency :
127.000 MHz
s
Connect an audio generator to
the [EXT MIC] jack and set as :
1 kHz/25 mVrms
s
Transmitting
Rear
panel
Rear
panel
Rear
panel
Connect an RF
power meter to the
antenna connector.
Connect a modula-
tion analyzer to the
antenna connector
through an attenua-
tor.
Connect a modula-
tion analyzer to the
antenna connector
through an attenua-
tor.
9.0 W
90 %
30 %
30 %
MAIN
MAIN
MAIN
R150
R121
R110
R336
2) Connect an am-
meter to CP5.
Recover the solder-
ing of CP5.
4 - 3
Summary of Contents for IC-A110
Page 16: ...SERVICE MANUAL ADDENDUM CONTENTS PARTS LIST 1 BOARD LAYOUTS 7 VOLTAGE DIAGRAM 9 Jun 2008 ...
Page 36: ...SERVICE MANUAL VHF AIR BAND TRANSCEIVER iA110 iA110EURO ...
Page 54: ...4 6 DC power supply 13 75 V 10 A L9 R59 L49 L10 L11 RX sensitivity adjustment ...
Page 79: ...S 13608HZ C1 2 c 2001 Icom Inc 1 1 32 Kamiminami Hirano ku Osaka 547 0003 Japan ...