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5 - 4
ADJUSTMENT
ADJUSTMENT
CONDITION
MEASUREMENT
VALUE
ADJUSTMENT
POINT
UNIT
LOCATION
UNIT
ADJUST
IDLING
CURRENT
(for pre-driver)
1 • Display frequency : 14.10000 MHz
• Mode : USB
• RF power : Minimum (L)
• Mic gain : Minimum (0)
• Disconnect J3601 (MAIN unit) and
preset R51, R56, R58, R64 (PA
unit) to counterclockwise.
• Transmitting
PA
1) Connect a digital
multimeter to the
CP1.
2) C o n n e c t a n
a m m e t e r ( 1 0 A )
between the power
supply and IC-718.
1) Set the voltage to
0.5 V.
2) Measure the idling
current, and note
i t a s t h e " i n i t i a l
value."
PA
R51
(for driver)
2 • Transmitting
+400 mA
more than the initial value
R56
3
+400 mA
more than the step "2"
R58
(for fi nal amplifi er)
4 • Transmitting
+2.0 A
more than the step "3"
R64
After the "IDLING CURRENT" adjustment, recover the connection of J3601.
SWR
DETECTOR
1 • Display frequency : 14.10000 MHz
• Mode : USB
• RF power : Maximum (H)
• Connect J4 (FILTER unit) to GND.
• Connect an audio generator to
[MIC] connector and set as;
Frequency :1.5
kHz
Level
:30
mVrms
• Transmitting
Rear
panel
C o n n e c t a n R F
power meter to [ANT]
connector.
100 W
Front
panel
Mic gain
control
in the
"quick set
mode."
2 • Transmitting
FILTER
C o n n e c t a d i g i t a l
multimeter to J5.
Minimum voltage
FILTER
C17
After the "SWR DETECTOR" adjustment, recover the connection of J4.
TRANSMITTER
TOTAL GAIN
1 • Display frequency : 14.10000 MHz
• Mode : USB
• RF power : Maximum (H)
• R2701 (MAIN unit) : Center
• Mic gain : Center (50)
• Connect an audio generator to
[MIC] connector and set as;
Frequency :1.5
kHz
Level
:3
mVrms
• Transmitting
Rear
panel
C o n n e c t a n R F
power meter to [ANT]
connector.
Maximum output
power
MAIN
L106,
L151,
L301,
L302,
L303,
L501
2 • Transmitting
50W
R503
OUTPUT
POWER
1 • Display frequency : 14.10000 MHz
• Mode : USB
• RF power : Maximum (H)
• Mic gain : Center (50)
• Connect an audio generator to
[MIC] connector and set as;
Frequency :1.5
kHz
Level
:30
mVrms
• Transmitting
Rear
panel
C o n n e c t a n R F
power meter to [ANT]
connector.
100 W
MAIN
R1707
Ic APC
1 • Display frequency : 3.55000 MHz
• Mode : USB
• RF power : Maximum (H)
• Mic gain : Center (50)
• Connect CP4002 (MAIN unit) to
GND.
• Connect an audio generator to
[MIC] connector and set as;
Frequency :1.5
kHz
Level
:30
mVrms
• Transmitting
Rear
panel
Connect an ammeter
(30 A) between power
supply and the IC-718.
22 A
MAIN
R1720
After the "
Ic APC
" adjustment, recover the connection of CP4002.
5-3 TRANSMITTER ADJUSTMENTS
Mar. 2010
(Replacement page)
Summary of Contents for IC-718
Page 29: ...SERVICE MANUAL ADDENDUM CONTENTS PARTS LIST 1 BOARD LAYOUTS 19 VOLTAGE DIAGRAM 25 Jun 2011 ...
Page 49: ...Jun 2011 20 C16 CP1 PLL UNIT BOTTOM VIEW FILTER UNIT BOTTOM VIEW PA UNIT BOTTOM VIEW ...
Page 81: ...SERVICE MANUAL ADDENDUM CONTENTS PARTS LIST 1 BOARD LAYOUTS 16 VOLTAGE DIAGRAM 18 Jul 2009 ...
Page 196: ...9 4 VARISTOR BOARD BOTTOM VIEW PLL UNIT BOTTOM VIEW PA UNIT ...
Page 200: ...9 8 BOTTOM VIEW FILTER UNIT ...
Page 206: ...1 1 32 Kamiminami Hirano ku Osaka 547 0003 Japan S 13701MZ C1 q 2000 Icom Inc ...