Icom IC-A110EURO Service Manual Addendum page 3

Oct. 2008
4-2 PLL ADJUSTMENT
ADJUSTMENT ADJUSTMENT CONDITION
Vdd
1 Operating frequency :
DRAIN
118.000 MHz
VOLTAGE
Receiving
Idd Operating frequency :
1
DRAIN 127.000 MHz
CURRENT Transmitting
2
PLL LOCK
1 Operating frequency :
VOLTAGE
118.000 MHz
Receiving
2 Transmitting
TUNE
1 Operating frequency :
VOLTAGE
118.000 MHz
Receiving
REFERENCE
1 Operating frequency :
FREQUENCY
136.950 MHz
Connect an RF power meter or a
50 dummy load to the antenna
connector.
Transmitting
4-3 TRANSMITTER ADJUSTMENT
ADJUSTMENT ADJUSTMENT CONDITION
OUTPUT
1 Operating frequency :
POWER
127.000 MHz
No audio applied to the [MIC]
jack.
Transmitting
MODULATION
1 Operating frequecy :
DEPTH
127.000 MHz
Connect an audio generator to
the [MIC] jack and set as :
1 kHz/10 mVrms
Set a modulation analyzer as :
HPF
LPF
De-emphasis : OFF
Detector
Pre-set R110 and R121 on the
MAIN unit to the center position.
Transmitting
2 Set an audio generator as:
1 kHz/1 mVrms
Transmitting
HEAD SET
1 Operating frequency :
MODULATION
127.000 MHz
Connect an audio generator to
the [EXT MIC] jack and set as :
1 kHz/25 mVrms
Transmitting
(REPLACEMENT PAGE)
UNIT
MAIN
MAIN
–
MAIN
MAIN
Rear
panel
UNIT
Rear
panel
Rear
panel
: OFF
: OFF
: (P–P)/2
Rear
panel
MEASUREMENT
LOCATION
Connect a digital
multi-meter to drain
terminal of Q51.
1) Unsolder CP5.
2) Connect an am-
meter to CP5.
Recover the solder-
ing of CP5.
Connect a digital
multi-meter to the
check point CP2.
0.3 V [A110EURO]
Connect a digital
multi-meter to the
check point CP1.
Loosely couple the
frequency counter
to the antenna con-
nector.
MEASUREMENT
LOCATION
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.
4 - 3
ADJUSTMENT
POINT
VALUE
UNIT
13.5 V MAIN
650–750 mA
MAIN
– –
0.5 V MAIN
0.5 V [A110]
0.7 V MAIN
136.9500 MHz MAIN
ADJUSTMENT
POINT
VALUE
UNIT
9.0 W MAIN
90 % MAIN
30 %
30 % MAIN
ADJUST
R392
R222
–
L41
L40
R59
X1
ADJUST
R150
R121
R110
R336