Receiver Adjustments - Icom IC-756PRO Service Manual
Hf/50mhz all band transceiver
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Also See for IC-756PRO:
- Instruction manual (84 pages) ,
- Service manual (104 pages) ,
- Alignment procedure (13 pages)
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4-3 RECEIVER ADJUSTMENTS
ADJUSTMENT
ADJUSTMENT CONDITION
1
• Display frequency: 14.100000 MHz
RX PEAK
• Mode
• Filter
• [P.AMP]
• [ATT]
• Connect an SSG to [ANT1] con-
nector and set as :
Frequency : 14.101500 MHz
Level
Modulation : 1 kHz/±7.5 kHz dev.
• Receiving
2
• [DUAL WATCH] : ON
• Sub display freq. : 14.100000 MHz
• Mode
• [BAL]
• Set an SSG as
Level
• Receiving
3
• Display frequency: 14.100000 MHz
• Mode
• [DUAL WATCH] : OFF
• Set following selections, controls
and functions as :
Filter : 2.4 kHz,
[AGC] : MID
PBT1 : Center ,
[NB] : OFF
[P.AMP]
[RF/SQL]
[AUTO NOTCH]: OFF
[NOTCH]
[NR] switch
[NR] level
[MONITOR]
• Connect an SSG to [ANT1] con-
nector and set as :
Frequency : 14.101500 MHz
Level
Modulation : OFF
• Receiving
1
• Display frequency: 0.030000 MHz
MIXER
BALANCE
• Sub display freq. : 0.030000 MHz
• Mode
• [BAL]
• Apply no no RF signal to [ANT1]
connector.
• Receiving
2
• [BAL]
• Receiving
FM
1
• Display frequency: 14.100000 MHz
• Sub display freq. : 14.100000 MHz
DISTORTION
• Mode
• [BAL]
• Connect an SSG to [ANT1] con-
nector and set as :
Frequency : 14.100000 MHz
Level
Modulation : 1 kHz/±7.5 kHz Dev.
• Receiving
2
• [BAL]
• Receiving
*This output level of a standard signal generator (SSG) is indicated as SSG's open circuit.
UNIT
Rear
: USB
panel
: 2.4 kHz
: P.AMP1
: OFF
: 10 µV* (–87 dBm)
: USB
: Max. CW
:
: 10 µV* (–87 dBm)
: USB
[ATT] : OFF
,
[BAL] : Center
PBT2 : Center
,
[RIT] : OFF
: P.AMP1
: Center
: Center
: OFF
: Max. CCW
: OFF
: 1 µV* (–107 dBm)
Rear
panel
: USB
: Max. CCW
: Max. CW
Rear
panel
: FM
: Max. CCW
: 500 µV* (–53 dBm)
: Max. CW
MEASUREMENT
LOCATION
Connect an AC milli-
Maximum audio output
volt meter to [EXT
level
SP] connector with
an 8 Ω load.
Connect an AC milli-
Minimum noise output
volt meter to [EXT
level
SP] connector with
an 8 Ω load.
Connect an distortion
Minimum
meter to [EXT SP]
level
connector with an
8 Ω load.
4 - 4
ADJUSTMENT
POINT
VALUE
UNIT
ADJUST
RF
MAIN
RF
distortion
RF
L513,
L721,
L722,
L943
L613
L111,
L112,
L113
R516
R616
C555
C655
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