Tuner Adjustment - Icom IC-756PRO Service Manual

TRANSMITTER ADJUSTMENTS—continued
ADJUSTMENT ADJUSTMENT CONDITION
RESIDUAL 1 • Display frequency: 29.60000 MHz
AM • Mode
• Filter
• [RF POWER]
• [MIC GAIN]
• [MONI]
• Connect CP503 on the MAIN unit to
GND.
• Connect an audio generator to
[MIC] connector and set as:
Frequency
Level
• Transmitting
1 • Displayed freq.
FM
DEVIATION • Mode
• Filter
• [RF POWER]
• [MIC GAIN]
• Connect an audio generator to
[MIC] connector and set as:
Frequency
Level
• Transmitting
AM 1 • Display frequency: 14.10000 MHz
MODULATION • Mode
• [MIC GAIN]
• [RF POWER]
• Connect an audio generator to
[MIC] connector and set as:
Frequency
Level
• Transmitting

4-5 TUNER ADJUSTMENT

ADJUSTMENT ADJUSTMENT CONDITION
SWR 1 • Display frequency: 29.70000 MHz
DETECTOR • Mode
• [RF POWER]
• [TUNER]
• Connect J12 on the CTRL unit to
GND.
• Connect a 50 Ω terminator to
[ANT1] connector.
• Transmitting
2 • Terminate [REMOTE] jack with a
3.5(d) mm mini-plug.
3
4
After adjustment, disconnect J12 on the CTRL board from GND.
MEASUREMENT
UNIT
Rear
: FM panel
: 15 kHz
: Max. CW
: Max. CW and CCW
: OFF
: 1 kHz
: 10 mVrms
: 29.60000 MHz Rear
: FM panel
: 15 kHz
: Max. CW
: Center
: 1 kHz
: 10 mVrms
Rear
: AM panel
: Center
: Max. CCW
: 1 kHz
: 10 mVrms
MEASUREMENT
UNIT
CTRL
: FM
: Max. CW
: Through
4 - 10
LOCATION
Connect an RF Minimum power differ-
power meter to ence with minimum
[ANT1] connector. MIC GAIN and maxi-
mum MIC GAIN.
Connect an FM devi-
ation meter to [ANT1]
connector through an
attenuator.
Connect a modula-
tion analyzer to
[ANT1] connector
through an attenua-
tor.
LOCATION
Connect a digital Minimum voltage
multimeter or oscillo-
scope to J14.
• 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".
ADJUSTMENT
POINT
VALUE
UNIT ADJUST
RF
±4.5 kHz DSP
90% DSP
ADJUSTMENT
POINT
VALUE
UNIT ADJUST
CTRL
L713,
L712,
L711
R2227
R2229
C3