Icom IC-7400, Service Manual, Page: 22 / 92

HF BANDS
OUTPUT
POWER
50 M BAND
OUTPUT
POWER
144 M BAND
OUTPUT
POWER
AM
CARRIER
AM
MODULATION
FM
DEVIATION
RESIDUAL
AM
SWR
DETECTOR
After adjustment, disconnect CP7 (CTRL unit) from GND.
5 - 6
TRANSMITTER ADJUSTMENTS—continued
ADJUSTMENT
ADJUSTMENT ADJUSTMENT CONDITION
MEASUREMENT
VALUE
POINT
UNIT LOCATION UNIT ADJUST
1
1
1
1
1
1
1
• Displayed freq. : 14.10000 MHz
• Mode
: RTTY
• [RF POWER] : Max. CW
• [TUNER] : OFF
• Transmitting
• Displayed freq. : 51.00000 MHz
• Mode
: RTTY
• [RF POWER] : Max. CW
• [TUNER] : OFF
• Transmitting
• Displayed freq. : 145.00000 MHz
• Mode
: RTTY
• [RF POWER] : Max. CW
• [TUNER] : OFF
• Transmitting
• Displayed freq. : 14.10000 MHz
• Mode
: AM
• [RF POWER] : Max. CW
• [MIC GAIN] : Center
• Apply no audio signals to [MIC]
connector.
• Transmitting
• Displayed freq. : 14.10000 MHz
• Mode
: AM
• [MIC GAIN] : Center
• [RF POWER] : Max. CCW
• Connect an audio generator to
[MIC] connector and set as:
Frequency : 1 kHz
Level : 10 mVrms
• Transmitting
• Displayed freq. : 28.50000 MHz
• Mode
: FM
• Tone : OFF
• [RF POWER] : Max. CW
• [MIC GAIN] : Center
• Connect an audio generator to
[MIC] connector and set as:
Frequency : 1 kHz
Level : 10 mVrms
• Transmitting
• Displayed freq. : 145.00000 MHz
• Mode
: FM
• Tone : OFF
• [RF POWER] : Max. CW
• [MIC GAIN] : Center
• Connect an audio generator to
[MIC] connector and set as:
Frequency : 1 kHz
Level : 4.5 kHz deviation
at the connected
deviation meter.
• Transmitting
• Displayed freq. : 29.70000 MHz
• Mode
: FM
• [RF POWER] : Max. CW
• [TUNER] : OFF (Through)
• Connect CP7 (SETI) on the CTRL
unit to GND.
• Connect a 50
Ω
dummy load or an
RF power meter to [ANT1] connector.
• Transmitting
Rear
panel
Rear
panel
Rear
panel
Rear
panel
Rear
panel
Rear
panel
Rear
panel
CTRL
Connect an RF
power meter to
[ANT1] connector.
Connect an RF
power meter to
[ANT1] connector.
Connect an RF
power meter to [ANT
144MHz] connector.
Connect an RF
power meter to [ANT
144MHz] connector.
Connect a modulation
analyzer to [ANT1]
connector through an
attenuator.
Connect an FM devi-
ation meter to [ANT1]
connector through an
attenuator.
Connect an FM devi-
ation meter to [ANT
144MHz] connector
through an attenua-
tor.
Connect a digital
multimeter or oscillo-
scope to the check
point CP1.
100 W
100 W
100 W
40 W
100% or less
4.5 kHz ±0.3 kHz
Minimum RESIDUAL
AM level
Minimum voltage
MAIN
MAIN
MAIN
MAIN
RF
CTRL
R306
R311
R317
R320
Verify
Verify
L252,
L251
,
C3