Icom IC-756PRO - 4-5 TUNER ADJUSTMENT

4-5 TUNER ADJUSTMENT
SWR
DETECTOR
ADJUSTMENT
ADJUSTMENT ADJUSTMENT CONDITION
MEASUREMENT
VALUE
POINT
UNIT LOCATION UNIT ADJUST
1
2
3
4
• Display frequency: 29.70000 MHz
• Mode : FM
• [RF POWER] : Max. CW
• [TUNER] : Through
• Connect J12 on the CTRL unit to
GND.
• Connect a 50 Ω terminator to
[ANT1] connector.
• Transmitting
• Terminate [REMOTE] jack with a
3.5(d) mm mini-plug.
CTRL Connect a digital
multimeter or oscillo-
scope to J14.
Minimum voltage CTRL C3
4 - 10
TRANSMITTER ADJUSTMENTS—continued
RESIDUAL
AM
FM
DEVIATION
AM
MODULATION
ADJUSTMENT
ADJUSTMENT ADJUSTMENT CONDITION
MEASUREMENT
VALUE
POINT
UNIT LOCATION UNIT ADJUST
1
1
1
• Display frequency: 29.60000 MHz
• Mode : FM
• Filter : 15 kHz
• [RF POWER] : Max. CW
• [MIC GAIN] : Max. CW and CCW
• [MONI] : OFF
• Connect CP503 on the MAIN unit to
GND.
• Connect an audio generator to
[MIC] connector and set as:
Frequency : 1 kHz
Level : 10 mVrms
• Transmitting
• Displayed freq. : 29.60000 MHz
• Mode : FM
• Filter : 15 kHz
• [RF POWER] : Max. CW
• [MIC GAIN] : Center
• Connect an audio generator to
[MIC] connector and set as:
Frequency : 1 kHz
Level : 10 mVrms
• Transmitting
• Display frequency: 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
Rear
panel
Rear
panel
Rear
panel
Connect an RF
power meter to
[ANT1] connector.
Connect an FM devi-
ation meter to [ANT1]
connector through an
attenuator.
Connect a modula-
tion analyzer to
[ANT1] connector
through an attenua-
tor.
Minimum power differ-
ence with minimum
MIC GAIN and maxi-
mum MIC GAIN.
±4.5 kHz
90%
RF
DSP
DSP
L713,
L712,
L711
R2227
R2229
• While pushing [SSB] and [CW], turn power
ON.
• Verify the display shows “SETUP START”.
• Push [F-5 (TUNER)].
• Verify the display shows “TUNER CAL”.
• Push [F-5 (START)].
• Verify the display shows “END”.
After adjustment, disconnect J12 on the CTRL board from GND.