Icom IC-7400 Service Manual page 22

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