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IC-756-3.qxd
INSTRUCTION MANUAL
HF/50 MHz
ALL MODE TRANSCEIVER
i756
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IMPORTANT
READ THIS INSTRUCTION MANUAL
CAREFULLY before attempting to operate the
transceiver.
SAVE THIS INSTRUCTION MANUAL. This in-
struction manual contains important safety and oper-
ating instructions for the IC-756.
PRECAUTIONS
R WARNING HIGH VOLTAGE! NEVER attach
an antenna or internal antenna connector during trans-
mission. This may result in an electrical shock or burn.
AVOID placing the transceiver against walls or putting
anything on top of the transceiver. This will obstruct
heat dissipation.
R NEVER apply AC to the [DC13.8V] socket on the
transceiver rear panel. This could cause a fire or ruin
the transceiver.
During mobile operation, DO NOT operate the trans-
ceiver without running the vehicle’s engine. When
transceiver power is ON and your vehicle’s engine is
OFF, the vehicle’s battery will soon become exhausted.
R NEVER apply more than 16 V DC, such as a 24 V
battery, to the [DC13.8V] socket on the transceiver rear
panel. This could cause a fire or ruin the transceiver.
Make sure the transceiver power is OFF before starting
the vehicle. This will avoid possible damage to the
transceiver by ignition voltage spikes.
R NEVER let metal, wire or other objects touch any
internal part or connectors on the rear panel of the
transceiver. This will cause electric shock.
During maritime mobile operation, keep the transceiver
and microphone as far away as possible from the mag-
netic navigation compass to prevent erroneous indica-
tions.
R NEVER expose the transceiver to rain, snow or
any liquids.
BE CAREFUL! The heatsink will become hot when op-
erating the transceiver continuously for long periods.
NEVER allow children to play with the transceiver.
AVOID using or placing the transceiver in areas with
temperatures below –10°C (+14°F) or above +60°C
(+140°F). Be aware that temperatures on a vehicle’s
dashboard can exceed 80°C (+176°F), resulting in per-
manent damage to the transceiver if left there for ex-
tended periods.
BE CAREFUL! If a linear amplifier is connected, set
the transceiver’s RF output power to less than the lin-
ear amplifier’s maximum input level, otherwise, the lin-
ear amplifier will be damaged.
Use Icom microphones only (supplied or optional).
Other manufacturer’s microphones have different pin
assignments and connection to the IC-756 may dam-
age the transceiver.
AVOID placing the transceiver in excessively dusty en-
vironments or in direct sunlight.
EXPLICIT DEFINITIONS
WORD
DEFINITION
The explicit definitions described at left apply to this in-
struction manual.
R WARNING
Personal injury, fire hazard or electric
shock may occur.
CAUTION Equipment damage may occur.
NOTE
If disregarded, inconvenience only.
No risk of personal injury, fire or elec-
tric shock.
The IC-756 complies with the essential requirements of
the 89/336/EEC directive for Electromagnetic Compati-
bility. This compliance is based on conformity with the
ETSI specification prETS300 684 (EMC product stan-
dard for Commercially Available Amateur Radio Equip-
ment).
i
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TABLE OF CONTENTS
IMPORTANT ..................................... i
PRECAUTIONS ................................ i
EXPLICIT DEFINITIONS .................. i
TABLE OF CONTENTS ................... ii
UNPACKING .................................... ii
4 RECEIVE AND TRANSMIT ... 25–40
∂F scan operation ........................ 48
Mode selection ............................. 25
Fine programmed scan/
fine ∂F scan .................................. 49
Twin PBT operation ....................... 25
Auto notch function ....................... 26
Memory scan operation ................ 49
Noise reduction ............................. 26
Select memory scan operation ..... 50
Noise blanker ................................ 26
Setting select memory channels ... 50
APF function ................................. 27
1 PANEL DESCRIPTION ......... 1–12
CW reverse mode ......................... 27
7 CLOCK AND TIMERS ........ 51–52
Front panel ...................................... 1
RTTY reverse mode ...................... 27
Setting the current time ................. 51
Microphone (HM-36) ....................... 8
CW pitch control ........................... 27
Setting power-on time ................... 51
LCD display .................................... 9
Filter selection .............................. 28
Setting power-off period ................ 52
Screen menu arrangement ........... 10
RIT and ∂TX ................................. 29
Timer operation ............................ 52
Rear panel .................................... 11
Dualwatch operation ..................... 30
Split frequency operation .............. 31
8 SET MODE .......................... 53–60
2 INSTALLATION AND
CONNECTIONS .................. 13–20
Quick split function ........................ 32
Monitor function ............................ 33
Set mode description .................... 53
VOX function ................................. 33
Level set mode .............................. 54
Unpacking .................................... 13
Meter function ............................... 34
Display set mode .......................... 54
Selecting a location ....................... 13
Speech compressor ...................... 34
Timer set mode ............................. 55
Grounding ..................................... 13
SWR reading ................................ 34
Miscellaneous (others) set mode .. 55
Antenna ........................................ 13
Electronic CW keyer ..................... 35
Required connections ................... 14
Memory keyer ............................... 36
9 OPTION INSTALLATIONS .... 61–62
Advanced connections ................. 15
Spectrum scope screen ................ 37
Power supply connections ............ 16
Opening the transceiver’s case ..... 61
Band memory
(for automatic antenna selection) .... 37
Linear amplifier connections ......... 17
UT-102 VOICE SYNTHESIZER
UNIT .............................................. 61
External antenna selector or
antenna tuner connections ........... 18
Repeater operation ....................... 38
Optional IF filters ........................... 62
Dial lock function ........................... 38
FSK and AFSK (SSTV)
connections .................................. 19
CR-502 HIGH STABILITY
CRYSTAL UNIT ............................... 62
Antenna tuner operation ............... 39
Optional external tuner operation .... 40
Remote jack (CI-V) information ..... 20
10 MAINTENANCE .................. 63–65
5 MEMORY OPERATION ...... 41–46
3 FREQUENCY SETTING ..... 21–24
Troubleshooting ............................ 63
Memory channels ......................... 41
When first applying power
(CPU resetting) ............................. 21
Fuse replacement ......................... 64
Memory channel selection ............ 41
Clock backup battery
replacement .................................. 64
Memory channel screen ............... 42
Initial settings ................................ 21
Memory channel programming ..... 43
VFO description ............................ 22
Tuning dial brake adjustment ........ 65
Frequency transferring .................. 44
Frequency setting with the
tuning dial ..................................... 23
Frequency calibration
(approximate) ................................ 65
Memory names ............................. 45
Memory clearing ........................... 45
Direct frequency entry with
the keypad .................................... 23
Memo pads ................................... 46
11 INTERNAL VIEWS .................... 66
Advanced tuning functions ............ 24
6 SCANS ................................ 47–50
12 SPECIFICATIONS .................... 67
Scan types .................................... 47
Preparation ................................... 47
Programmed scan operation ......... 48
13 OPTIONS .................................. 68
UNPACKING
q
w
e r
Accessories included with the IC-756:
Qty.
q DC power cable (OPC-025A) .............................. 1
w Hand microphone (HM-36) .................................. 1
e Spare fuses (FGB 20 A) ...................................... 2
r Spare fuse (FGB 5 A) .......................................... 1
t CW keyer plug (AP-330) ...................................... 1
t
ii
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1
PANEL DESCRIPTION
Front panel
!7
!6
!5
!4
!3
TIMER
q
POWER
5
9 +20 +40 +60dB
25 50 100
ANT
ANT
1
METER
METER
PPo 
P.AMP
P.AMP
OFF
OFF
ATT
ATT
OFF
OFF
AGC
AGC
MID
MID
9
2.4k
2.4k
455
455
2.8k
2.8k
12:34
1
10
TTX
USB
0
TRANSMIT
S
14.195.000
1 1.5 2 3
ˋ
VFO
VFO
w
Po
SWR
ALC
ʿ
 1ß
14.100.00
14.100.00
USB
USB
HF/50MHz TRANSCEIVER
i756
USB
PHONES
TUNER MONITOR
NB
NR
556 ß
14.205.000
USB
USB
e
VFO
VFO
14.100.00
14.100.00
AF
RF/SQL
BAL
NR
ELEC-KEY
VOX
VOX
OFF
OFF
COMP
COMP
 OFF
OFF
r
MIC
t
SCOPE 
FILTER
MEMORY
SCAN
SET 
F-1
F-2
F-3
F-4
F-5
SSB
CW
RTTY
AM
FM
MIC GAIN RF POWER COMP KEY SPEED BK-IN DELAY
y i !0!1 !2
u
o
q
POWER SWITCH [POWER/TIMER]
• Push momentarily to turn power ON.
- Turn the optional DC power supply ON in advance.
• Push momentarily to toggle the timer function ON
and OFF. (p. 52)
- The power switch lights while the timer function is ON.
• Push for 2 sec. to turn power OFF.
(dot)
(com)
(dash)
t
MICROPHONE CONNECTOR [MIC]
Accepts the supplied or optional microphone.
- See p. 68 for appropriate microphones.
- See p. 8 for microphone connector information.
w
TRANSMIT SWITCH [TRANSMIT]
Selects transmitting or receiving.
- The [TX] indicator lights red while transmitting and the
[RX] indicator lights green when the squelch is open.
y
AF CONTROL [AF] (inner control)
Varies the audio output level from the speaker.
e
HEADPHONE JACK [PHONES]
Accepts headphones.
- When headphones are connected, the internal speaker
or connected external speaker does not function.
AF RF/SQL
Decreases
Increases
No audio output
Max. audio output
r
ELECTRONIC KEYER JACK [ELEC-KEY] (p. 35)
Accepts a paddle to activate the internal electronic
keyer for CW operation.
- Selection between the internal electronic keyer, bug-key
and straight key operation can be made in keyer set
mode. (p. 35)
- A straight key jack is separately available on the rear
panel. See [KEY] on p. 11.
- Keyer polarity (dot and dash) can be reversed in keyer
set mode. (p. 35)
- 4-channel memory keyer is available for your conve-
nience. (p. 36)
u
MIC GAIN CONTROL [MIC GAIN]
Adjusts microphone input gain.
How to set the microphone gain.
Set the [MIC] control so that the ALC meter sometimes
swings during normal voice transmission in SSB mode.
Recommended level for
an Icom microphone
Decreases
Increases
MIC GAIN
1
14.205.000
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PANEL DESCRIPTION
1
i
RF GAIN CONTROL/SQUELCH CONTROL
[RF/SQL] (outer control)
Adjusts the RF gain and squelch threshold level.
The squelch removes noise output from the speaker
(closed condition) when no signal is received.
- The squelch is particularly effective for FM. It is also
available for other modes.
- The control can be set as the RF gain control only
(squelch is fixed open) or squelch control (RF gain is
fixed at maximum) in set mode as follows. (p. 56)
- 11 to 12 o’clock position is recommended for any set-
ting of the [RF/SQL] control.
!0
BALANCE CONTROL [BAL] (inner control; p. 30)
Adjusts the audio output balance between main and
sub readout frequencies while in dualwatch.
BAL NR
Increases main
readout gain
Increases sub
readout gain
!1
COMPRESSION LEVEL CONTROL [COMP]
(p. 34)
Adjusts the speech compression level in SSB.
• When setting as RF gain/squelch control
Compression
level decreases
Compression
level increases
COMP
Noise squelch (FM mode)
Recommended level
!2
NOISE REDUCTION LEVEL CONTROL [NR]
(outer control; p. 26)
Adjusts the noise reduction level when the noise re-
duction is in use. Set for maximum readability.
Squelch is
open.
Maximum
RF gain
RF gain
adjustable
range
BAL NR
S-meter
squelch
Decreases
Increases
OFF
• When setting as RF gain control
(Squelch is fixed open.)
!3
NOISE REDUCTION SWITCH [NR] (p. 26)
Toggles the noise reduction ON and OFF. Functions
in SSB, CW and RTTY modes.
Maximum
RF gain
NR
NR
Noise reduction OFF
Noise reduction ON
Adjustable
range
!4
NOISE BLANKER SWITCH [NB] (p. 26)
Toggles the noise blanker ON and OFF. The noise
blanker reduces pulse-type noise such as that gen-
erated by automobile ignition systems. This function
cannot be used for FM, or non-pulse-type noise.
Minimum RF gain
• When setting as squelch control
(RF gain is fixed at maximum.)
Noise squelch (FM mode)
NB
NB
Noise blanker OFF
Noise blanker ON
Noise squelch
threshold (FM mode)
S-meter squelch
threshold
!5
S/RF METER (p. 34)
Shows the signal strength while receiving. Shows
the relative output power, SWR or ALC levels while
transmitting.
Squelch is
open.
S-meter
squelch
Shallow
Deep
!6
MONITOR SWITCH [MONITOR] (p. 33)
Monitors your transmitted IF signal.
- The CW sidetone functions when [MONITOR] is OFF in
CW mode.
o
RF POWER CONTROL [RF POWER]
Continuously varies the RF output power from min-
imum (2 W*) to maximum (100 W*).
* AM mode: 1 W to 40 W
!7
ANTENNA TUNER SWITCH [TUNER] (p. 39)
• Turns the antenna tuner ON and OFF (bypass)
when pushed momentarily.
• Starts to tune the antenna manually when pushed
for 2 sec.
- When the tuner cannot tune the antenna, the tuning
circuit is bypassed automatically after 20 sec.
Decreases
Increases
RF POWER
2
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