Icom IC-756PRO Instruction Manual
  1. Manuals
  2. Brands
  3. Icom Manuals
  4. Transceiver
  5. IC-756PRO III
  6. Instruction manual

Icom IC-756PRO Instruction Manual

Hf/50 mhz all mode transceiver
Hide thumbs Also See for IC-756PRO:
Table of Contents

Advertisement

Quick Links

Download this manual See also: Service Manual
INSTRUCTION MANUAL
HF/50 MHz
ALL MODE TRANSCEIVER
i756PRO

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the IC-756PRO and is the answer not in the manual?

Questions and answers

Nazaire Tetreault
March 12, 2025

Why can’t Icom make more voice synthesizers for Icom 756 Pro 2 Would love to buy one

0

Related Manuals for Icom IC-756PRO

Summary of Contents for Icom IC-756PRO

  • Page 1 INSTRUCTION MANUAL HF/50 MHz ALL MODE TRANSCEIVER i756PRO...

  • Page 2: Explicit Definitions

    AVOID placing the transceiver against walls or putting anything on top of the transceiver. This will obstruct heat dissipation. Versions of the IC-756PRO which display the “CE” symbol on the serial number seal, comply with the European harmonised standard ETS300 684 (EMC product standard for Commercially Available Amateur Radio Equipment).

  • Page 3: Table Of Contents

    IMPORTANT ... i EXPLICIT DEFINITIONS ... i PRECAUTIONS ... i 1 TABLE OF CONTENTS ... 1 2 PANEL DESCRIPTION ... 2 – 13 Front panel ... 2 Microphone (HM-36) ... 9 LCD display ... 10 Screen menu arrangement ... 11 Rear panel ...

  • Page 4: Panel Description

    (p. 65) ✔ 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 CW/RTTY AM/FM FILTER EXIT...
  • Page 5 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.
  • Page 6 PANEL DESCRIPTION Front panel (continued) EIVER i756PRO COMP KEY SPEED BK-IN DELAY !7 COMPRESSION LEVEL CONTROL [COMP] (p. 37) Adjusts the speech compression level in SSB. Compression level decreases COMP !8 ELECTRONIC CW KEYER SPEED CONTROL [KEY SPEED] (p. 42) Adjusts the internal electronic CW keyer’s speed.
  • Page 7 @8 MAIN/SUB CHANGE SWITCH [CHANGE] Toggles the frequency and selected memory channel between main and sub readouts when pushed. • Toggles between transmit frequency and receive fre- quency when the split frequency function is ON. (p. Equalizes the sub readout frequency to the main readout frequency when pushed for 2 sec.
  • Page 8 PANEL DESCRIPTION Front panel (continued) CEIVER i756PRO COMP KEY SPEED BK-IN DELAY @8 LOCK SWITCH [LOCK] (p. 45) Turns the dial lock function ON and OFF. @9 RIT/∂ ∂ TX CONTROL [RIT/∂ ∂ TX] (p. 34) Shifts the receive and/or transmit frequency without changing the transmit and/or receive frequency while the RIT and/or ∂TX functions are ON.
  • Page 9 • [GENE] selects the general coverage band. Pushing the same key 2 or 3 times calls up other stacked frequencies in the band. (p. 24) • Icom’s triple band stacking register memorizes 3 fre- quencies in each band. After pushing [F-INP], enters a keyed frequency or memory channel.
  • Page 10 PANEL DESCRIPTION Front panel (continued) EIVER i756PRO COMP KEY SPEED BK-IN DELAY $6 LCD FUNCTION DISPLAY (See p. 10 for details.) Shows the operating frequency, function switch menus, spectrum screen, memory channel screen, set mode settings, etc. $7 MEMORY UP/DOWN SWITCHES [Y Y ]/[Z Z ] (p. 50) Select the memory channel number for the se- lected readout.

  • Page 11: Microphone (Hm-36)

    Microphone (HM-36) q UP/DOWN SWITCHES [UP]/[DN] Change the selected readout frequency or memory channel. • Continuous pushing changes the frequency or memory channel number continuously. • While pushing [XFC], the transmit readout frequency can be controlled while in spilt frequency operation. •...

  • Page 12: Lcd Display

    PANEL DESCRIPTION LCD display q TX INDICATOR Indicates the frequency readout for transmit. w VFO/MEMORY CHANNEL INDICATOR (pgs. 23, 50) Indicates the VFO mode or selected memory chan- nel number. e SELECT MEMORY CHANNEL INDICATOR (p. 59) Indicates the displayed memory channel is set as a select memory channel.

  • Page 13: Screen Menu Arrangement

    Screen menu arrangement The following screens can be selected from the start up screen. Choose the desired screen using the fol- lowing chart. •Start up screen qr≥qpp≥pp qr≥qpp≥pp F - 2 F - 3 F - 4 F - 1 •Programmed scan screen (p.

  • Page 14: Rear Panel

    (pgs. 16, 81) Accepts an 4–8 o ALC INPUT JACK [ALC] (p. 19) or AH-3 Connects to the ALC output jack of a non-Icom lin- ear amplifier. !0 SEND CONTROL JACK [SEND] (p. 19) Goes to ground while transmitting to control exter- nal equipment such as a linear amplifier.

  • Page 15: Panel Description ........... 2

    !2 ANTENNA CONNECTOR 1 [ANT1] !3 ANTENNA CONNECTOR 2 [ANT2] (pgs. 14, 15) Accept a 50 antenna with a PL-259 connector. When using an optional AH-4 HF/50 MHz AUTO- or AH-3 MATIC ANTENNA TUNER HF AUTOMATIC AN- , connect it to the [ANT1] connector. TENNA TUNER The internal antenna tuner activates for [ANT2] and deactivates for [ANT1] when connecting the AH-4 or...

  • Page 16: Installation And Connections

    In this case, an antenna tuner is useful to match the transceiver and antenna. Low SWR allows full connect the [GND] power for transmitting even when using the antenna tuner. The IC-756PRO has an SWR meter to monitor the antenna SWR continuously. antenna, Protect your transceiver from lightning...

  • Page 17: Required Connections

    Required connections • Front panel CW KEY A straight key can be used when the internal electronic keyer is turned OFF in keyer set mode. (p. 42) • Rear panel ANTENNA 1, 2 (p. 14) [Example]: ANT1 for 1.8–18 MHz bands ANT2 for 21–50 MHz bands GROUND (p.

  • Page 18: Advanced Connections

    3.5 2 SPLIT DUAL WATCH CHANGE PBT CLR NOTCH F-INP GENE • M-CL VFO/ MEMO NOTCH CW PITCH MP-W MP-R MAIN/ LOCK CLEAR RIT/ SPEECH LOCK FILTER EXIT [SEND], [ALC] (p. 19) Used for connecting a non-Icom linear ampli- fier. SP-20...

  • Page 19: Power Supply Connections

    Make sure: • The [POWER] switch is OFF. • Output voltage of the power source is 12–15 V when you use a non-Icom power supply. • DC power cable polarity is correct. : positive + terminal Black...

  • Page 20: Linear Amplifier Connections

    IC-4KL Remote controller Transceiver Ground Be sure to connect the cable to the 7-pin ACC(2) jack. Connect [INPUT2] if necessary. ANT2 ANT1 ACC(2) REMOTE IC-756PRO To an antenna IC-4KL Remote control cable (supplied with the IC-4KL) AC outlet (220–240 V)

  • Page 21: Transverter Jack Information

    80 W max. with the [RF POWER] control, other- wise, a protection circuit will activate. CONNECTING A NON-ICOM LINEAR AMPLIFIER R WARNING: Set the transceiver output power and linear amplifier ALC output level referring to the linear amplifier instruction manual.

  • Page 22: External Antenna Selector Or Antenna Tuner Connections

    INSTALLATION AND CONNECTIONS External antenna selector or antenna tuner connections CONNECTING THE EX-627 Coaxial cable ANT1 ACC(2) CONNECTING THE AH-4 or AH-3 • The AH-4 and AH-3 must be connected to [ANT1]. • The AH-3 can be used for the HF bands only, although the [ANT1] con- nector is used for both HF and 50 MHz operation.

  • Page 23: Fsk And Afsk (Sstv) Connections

    FSK and AFSK (SSTV) connections To connect a terminal unit, TNC or scan converter, refer to the diagram below. For RTTY operation: Narrow filter settings may not pass RTTY signals. Be sure to select the appropriate IF filter settings corresponding to the signal width. (p. 29) FSK (RTTY) connection Use RTTY mode for operation...

  • Page 24: Frequency Setting

    FREQUENCY SETTING When first applying power Before first applying power, make sure all connections required for your system are complete by referring to Chapter 3. Then, reset the transceiver using the fol- lowing procedure. Resetting CLEARS all programmed contents in memory channels and returns programmed values in set mode to default values.

  • Page 25: Vfo Description

    The transceiver’s VFO is somewhat different. The VFO of the IC-756PRO acts like a computer’s window and can show one frequency and one operating mode. You can call up a desired frequency to the VFO with the keypad, memo pad-read switch (see p.

  • Page 26: Frequency Setting With The Tuning Dial

    FREQUENCY SETTING Frequency setting with the tuning dial • For ham band use q Push the desired band key on the keypad 1–3 times. • 3 different frequencies can be selected on each band with the band key. (See “Triple band stacking register” below.) wq≥wpp≥pp w Rotate the tuning dial to set the desired frequency.

  • Page 27: Advanced Tuning Functions

    Advanced tuning functions QUICK TUNING STEP The operating frequency can be changed in kHz steps (0.1, 1, 5, 9, 10, 12.5, 20 or 25 kHz selectable) for quick tuning. q Push [TS] momentarily to display the quick tuning indicator. Quick tuning indicator qr≥qpp≥pp w Rotate the tuning dial to change the frequency in programmed kHz steps.

  • Page 28: Receive And Transmit

    RECEIVE AND TRANSMIT Mode selection The following modes are available in the IC-756PRO: SSB (LSB/USB), CW, CW-R (CW reverse), RTTY, RTTY-R (RTTY reverse), AM and FM. Data modes of SSB, AM and FM are also available. Microphone signals are muted when data mode is selected.

  • Page 29: Notch Function

    Notch function This transceiver has auto and manual notch func- tions. The auto notch function automatically attenu- ates more than 3 beat tones, tuning signals, etc., even if they are moving. The manual notch can be set to attenuate a frequency via the [NOTCH] control. Push [NOTCH] to toggle the notch function be- tween auto, manual and OFF in SSB and AM modes.

  • Page 30: Rtty Filter/Twin Peak Filter

    RECEIVE AND TRANSMIT RTTY filter/Twin peak filter The transceiver has 5 RTTY filters in addition to nor- mal IF filters. The passband width can be selected from 1 kHz, 500 Hz, 350 Hz, 300 Hz and 250 Hz. When the RTTY filter is turned ON, the RTTY tuning meter can be used.

  • Page 31: Cw Pitch Control

    CW pitch control The received CW audio pitch and monitored CW audio can be adjusted to suit your preferences (300 to 900 Hz) without changing the operating frequency. The received CW audio pitch can be adjusted in 25 Hz steps. IF filter selection The transceiver has 3 passband width IF filters for each mode.

  • Page 32: Agc Function

    RECEIVE AND TRANSMIT AGC function The AGC (auto gain control) controls receiver gain to produce a constant audio output level even when the received signal strength is varied by fading, etc. The transceiver has 3 AGC characteristics (time con- stant; fast, mid, slow) for non-FM mode. The FM mode AGC time constant is fixed as ‘FAST’...

  • Page 33: Dualwatch Operation

    Dualwatch operation Dualwatch monitors 2 frequencies with the same mode simultaneously. During dualwatch, both frequencies should be on the same band, because the bandpass filter in the RF cir- cuit is selected for the main readout frequency. q Set a desired frequency. w Push [DUALWATCH] for 2 sec.

  • Page 34: Split Frequency Operation

    RECEIVE AND TRANSMIT Split frequency operation Split frequency operation allows you to transmit and receive in the same mode on two different frequen- cies. The split frequency operation is basically per- formed using 2 frequencies on the main and sub readouts.

  • Page 35: Quick Split Function

    Quick split function When you find a DX station, an important considera- tion is how to set the split frequency. When you push the [SPLIT] switch for 2 sec., split fre- quency operation is turned ON, the sub readout is equalized to the main readout frequency and enters standby for transmit frequency input.

  • Page 36: Rit And ∂Tx

    RECEIVE AND TRANSMIT RIT and ∂ ∂ TX • RIT function The RIT function shifts the receive frequency up to ±9.999 kHz in 1 Hz steps (10 Hz steps when can- celling the 1 Hz step readout) without moving the transmit frequency.

  • Page 37: Monitor Function

    Monitor function The monitor function allows you to monitor your trans- mit IF signals in any mode through the speaker. Use this to check voice characteristics while adjusting SSB transmit tones. (p. 65) The CW sidetone func- tions regardless of the [MONITOR] switch setting. q Push [MONITOR].

  • Page 38: Meter Function

    RECEIVE AND TRANSMIT Meter function The transceiver has 4 transmit meter functions for your convenience. Select the desired meter with the [METER] switch. • Analog transmit meter Push [METER] to select RF power (Po), SWR, ALC or compression level (COMP) for transmit metering. [METER] switch DISPLAY MEASUREMENT...

  • Page 39: Speech Compressor

    Speech compressor The RF speech compressor increases average RF output power, improving signal strength and readabil- ity in SSB. • Speech compressor q Select USB or LSB mode. w Push [COMP] momentarily to turn the speech compressor ON and OFF. e Push [COMP] for 2 sec.

  • Page 40: Digital Voice Recorder

    RECEIVE AND TRANSMIT Digital voice recorder The transceiver has a total of 8 memory channels, 4 each for transmit and receive, of digital voice memo- ries. A maximum message of 15 sec. can be recorded in each transmit and receive channels. Providing a transmission memory is very convenient for repeated CQ and number transmissions at contest times, as well as when making consecutive calls in...
  • Page 41 Digital voice recorder • Recording a message for transmit To transmit a message using a voice recorder, record the desired message in advance as described below. q Push [EXIT] one or more times to close a multi- function screen, if necessary. w Select a phone mode by pushing [SSB] or [AM/FM].
  • Page 42 RECEIVE AND TRANSMIT Digital voice recorder • Sending a message for transmit q Push [EXIT] one or more times to close a multi- function screen, if necessary. w Select a phone mode by pushing [SSB] or [AM/FM]. e Push [(F-2)VOICE] to call up the voice recorder screen.

  • Page 43: Rtty Decoder

    RTTY decoder The transceiver has an RTTY decoder for Baudot (mark freq.: 2125 Hz, shift freq.: 170 Hz, 45 bps). An external terminal unit (TU) or terminal node con- troller (TNC) is not necessary for receiving a Baudot signal. q Push [EXIT] one or more times to close a multi- function screen, if necessary.

  • Page 44: Electronic Cw Keyer

    RECEIVE AND TRANSMIT Electronic CW keyer The transceiver has an electronic keyer. Keying speed can be adjusted with [KEY SPEED]. Keying weight, the ratio of dot : space : dash, can be set from 1 : 1 : 2.8 to 1 : 1 : 4.5 in keyer set mode. •...

  • Page 45: Memory Keyer

    Memory keyer The memory keyer memorizes and can re-transmit 4 CW key codes for often-used CW sentences, antenna types, etc. Total capacity of the memory keyer is 54 characters in each memory channel. • Programming the memory keyer q Push [CW/RTTY] to select CW mode. w Push [(F-2)KEYER] to select keyer set mode.

  • Page 46: Spectrum Scope Screen

    RECEIVE AND TRANSMIT Spectrum scope screen This function allows you to display the relative strengths of signals around the center frequency. The span can be set to ±12.5 kHz, ±25 kHz, ±50 kHz and ±100 kHz. Ideal for monitoring band conditions in an instant.

  • Page 47: Automatic Antenna Selection

    Automatic antenna selection The transceiver covers 0.1–60 MHz over 10 bands. Each band key has a band memory which can mem- orize a selected antenna (ANT1, ANT2, ANT1/RX an- tenna and ANT2/RX antenna). When you change the operating frequency beyond a band, the previously used antenna is automatically selected for the new band.

  • Page 48: Repeater Operation

    RECEIVE AND TRANSMIT Repeater operation A repeater amplifies received signals and retransmits them at a different frequency. When using a repeater, the transmit frequency is shifted from the receive fre- quency by an offset frequency. A repeater can be ac- cessed using split frequency operation with the shift frequency set to the repeater’s offset frequency.

  • Page 49: Tone Squelch Operation

    Tone squelch operation The tone squelch opens only when receiving a signal containing a matching subaudible tone. You can silently wait for calls from group members using the same tone. q Push [VFO/MEMO] to select VFO mode. wq≥wop≥pp qr≥wpt≥pp w Push the desired band key. e Push [AM/FM] one or more times to select FM mode.

  • Page 50: Antenna Tuner Operation

    RECEIVE AND TRANSMIT Antenna tuner operation The internal automatic antenna tuner matches the transceiver to the connected antenna automatically. Once the tuner matches an antenna, the variable ca- pacitor angles are memorized as a preset point for each frequency range (100 kHz steps). Therefore, when you change the frequency range, the variable ca- pacitors are automatically preset to the memorized point.

  • Page 51: Optional External Tuner Operation

    Optional external tuner operation • AH-4/AH-3 HF AUTOMATIC ANTENNA TUNER The AH-4/AH-3 matches the IC-756PRO to a long wire antenna more than 3 m/10 ft long (3.5 MHz and above) or more than 12 m/40 ft long (1.8 MHz and above).

  • Page 52: Memory Operation

    MEMORY OPERATION Memory channels The transceiver has 101 memory channels. The mem- ory mode is very useful for quickly changing to often- used frequencies. MEMORY MEMORY CHANNEL CHANNEL NUMBER Regular memory 1–99 channels Scan edge memory P1, P2 channels Memory channel selection •...

  • Page 53: Memory Channel Screen

    Memory channel screen The memory channel screen simultaneously shows 7 memory channels and their programmed contents. 13 memory channels can be displayed in the wide mem- ory channel screen. You can select a desired memory channel from the memory channel screen. •...

  • Page 54: Memory Channel Programming

    MEMORY OPERATION Memory channel programming Memory channel programming can be preformed ei- ther in VFO mode or in memory mode. • Programming in VFO mode q Set the desired frequency and operating mode in VFO mode. w Push [Y]/[Z] several times to select the desired memory channel.

  • Page 55: Frequency Transferring

    Frequency transferring The frequency and operating mode in a memory chan- nel can be transferred to the VFO. • Transferring in VFO mode This is useful for transferring programmed contents to VFO. q Select VFO mode with [VFO/MEMO]. w Select the memory channel to be transferred with [Y]/[Z].

  • Page 56: Memory Names

    MEMORY OPERATION Memory names All memory channels (including scan edges) can be tagged with alphanumeric names of up to 10 charac- ters each. Capital letters, small letters, numerals, some symbols / . , : ; = < > ( ) [ ] { } | _ (! # $ % &...

  • Page 57: Memo Pads

    Memo pads The transceiver has a memo pad function to store fre- quency and operating mode for easy write and recall. The memo pads are separate from memory channels. The default number of memo pads is 5, however, this can be increased to 10 in set mode if desired. (p. 71) •...

  • Page 58: Scans

    SCANS Scan types PROGRAMMED SCAN Repeatedly scans between two scan edge frequencies (scan edge memory channels P1 and P2). Scan edge P1 or P2 Scan Jump This scan operates in VFO mode. MEMORY SCAN Repeatedly scans all programmed memory channels. (select) Mch 2 Mch 3...

  • Page 59: Programmed Scan Operation

    Programmed scan operation q Push [EXIT] one or more times to close a multi- function screen, if necessary. w Select VFO mode. e Select the desired operating mode. • The operating mode can also be changed while scan- ning. r Push [(F-4)SCAN] to select the scan screen. qr≥qot≥pp qr≥wpt≥pp t Set [RF/SQL] open or closed.

  • Page 60: Fine Programmed Scan/Fine ∂F Scan

    SCANS Fine programmed scan/fine ∂F scan Fine scan functions as programmed or ∂F scan, but scan speed decreases when the squelch opens but does not stop. The scanning tuning step shifts from 50 Hz to 10 Hz while the squelch opens. q Push [EXIT] one or more times to close a multi- function screen, if necessary.

  • Page 61: Select Memory Scan Operation

    Select memory scan operation q Push [EXIT] one or more times to close a multi- function screen, if necessary. w Select memory mode. e Select the desired operating mode. • The operating mode can also be changed while scan- ning. r Push [(F-4)SCAN] to select the scan screen.

  • Page 62: Scan Set Mode

    SCANS Scan set mode Scan set mode is used for programming scanning speed and scan resume condition. • Scan speed The transceiver has 2 speeds for scanning, high and low. q Push [EXIT] one or more times to close a multi- function screen, if necessary.

  • Page 63: Tone Scan

    Tone scan The transceiver can detect the subaudible tone fre- quency in a received signal. By monitoring a signal that is being transmitted on a repeater input fre- quency, you can determine the tone frequency re- quired to access the repeater. q Set the desired frequency or memory channel to be checked for a tone frequency.

  • Page 64: Clock And Timers

    CLOCK AND TIMERS Setting the current time The transceiver has a built-in 24-hour clock with power-off and power-on timer functions. This is use- ful when logging QSO’s and so on. The clock indica- tion is always displayed except after pushing [F-INP]. q Push [EXIT] one or more times to close a multi- function screen, if necessary.

  • Page 65: Setting Power-Off Period

    Setting power-off period The transceiver can be set to turn OFF automatically after being activated via the power-on timer. The power-off period can be set to 5–120 min. in 5 min. steps. q Push [EXIT] one or more times to close a multi- function screen, if necessary.

  • Page 66: Set Mode

    SET MODE Set mode description Set mode is used for programming infrequently changed values or conditions of functions. This trans- ceiver has a level set mode, display set mode, timer set mode and miscellaneous (others) set mode. • Set mode operation q Push [EXIT] one or more times to close a multi- function screen, if necessary.

  • Page 67: Level Set Mode

    Level set mode This item adjusts the bass level of the transmit audio tone in SSB mode from –5 dB to +5 dB in 1 dB steps. This item adjusts the treble level of the transmit audio tone in SSB mode from –5 dB to +5 dB in 1 dB steps. This item adjusts the transmit IF signal monitor level from 0 % to 100 % in 1 % steps.

  • Page 68: Display Set Mode

    SET MODE Display set mode To adjust the LCD contrast or backlight, wait until the LCD becomes stable (10 min. or more after turning power ON). This is an inherent characteristic of LCDs and LCD backlights and does not indicate a transceiver malfunction.

  • Page 69: Timer Set Mode

    • Push [(F-4)SPACE] to input a space. y Push [EXIT] to input the set name. • The cursor disappears. u Push [EXIT] to exit the set mode screen. • Opening screen example iC-756pro iC-756pro iC-756pro NOW CALIBRATING DIGITAL SIGNAL PROCESSOR...

  • Page 70: Miscellaneous (Others) Set Mode

    SET MODE Miscellaneous (others) set mode This item is used for a simple frequency check of the transceiver. See p. 76 for calibration procedure. Turn the calibration marker OFF after checking the frequency of the transceiver. A beep sounds each time a switch is pushed to con- firm it.
  • Page 71 Miscellaneous (others) set mode This item sets the offset (difference between transmit and receive frequencies) for the quick split function. However, this setting is used for HF bands in FM mode only and is used to input the repeater offset for an HF band.
  • Page 72 SET MODE Miscellaneous (others) set mode You can set the antenna connector selection to auto- matic, manual or non-selection (when using 1 an- tenna only). When “Auto” is selected, the antenna switch is acti- vated and the band memory memorizes the selected antenna.
  • Page 73 Miscellaneous (others) set mode This item selects the new line code of the internal RTTY decoder. See p. 41 for details. CR : Carriage Return LF : Line Feed When the optional UT-102 VOICE SYNTHESIZER UNIT installed, you can select between English and Japan- ese as the language.
  • Page 74 To distinguish equipment, each CI-V transceiver has its own Icom standard address in hexadecimal code. The IC-756PRO’s address is 5Ch. When 2 or more IC-756PRO’s are connected to an optional CT-17 V LEVEL CONVERTER ing dial to select a different address for each IC-756PRO in the range 01h to 7Fh.

  • Page 75: Option Installation

    Opening the transceiver’s case Follow the case and cover opening procedures shown here when you want to install an optional unit or adjust the internal units, etc. q Remove 2 screws from the left side of the trans- ceiver to remove the carrying handle as shown below.

  • Page 76: Maintenance

    If you are unable to locate the cause of a problem or solve it through the use of this chart, contact your near- est Icom Dealer or Service Center. POSSIBLE CAUSE • Reconnect the DC power cable correctly.

  • Page 77: Fuse Replacement

    • Circuitry fuse ... FGB 5 A CIRCUITRY FUSE REPLACEMENT The 13.8 V DC from the DC power cable is applied to all units in the IC-756PRO, except for the power am- plifier, through the circuitry fuse. This fuse is installed in the PA unit.

  • Page 78: Tuning Dial Brake Adjustment

    MAINTENANCE Tuning dial brake adjustment The tension of the tuning dial may be adjusted to suit your preference. The brake adjustment screw is located on the right side of the tuning dial. See the figure at right. Turn the brake adjustment screw clockwise or coun- terclockwise to obtain a comfortable tension level while turning the dial continuously and evenly in one direction.

  • Page 79: Internal Views

    • Top view PA unit PA fuse (FGB 5 A) • Bottom view RF unit PLL unit INTERNAL VIEWS Internal antenna tuner FILTER unit Clock backup battery Space for optional voice synthesizer (UT-102) MAIN unit...

  • Page 80: Control Command

    RS-232C port. The Icom Communi- cations Interface-V (CI-V) controls the following func- tions of the transceiver. Up to 4 Icom CI-V transceivers or transceivers can be connected to a personal computer equipped with an RS-232C port. See p. 72 for setting the CI-V condition using set mode.
  • Page 81 • Command table Command Sub command Description — Send frequency data Same as Send mode data command 06 — Read band edge frequencies — Read operating frequency — Read operating mode — Set frequency data Set LSB Set USB Set AM Set CW Set RTTY Set FM...

  • Page 82: Specifications

    SPECIFICATIONS • General • Frequency coverage Receive 00.030–60.000 MHz* Transmit 01.800–01.999* 03.500–03.999* 07.000–07.300* 10.100–10.150* 14.000–14.350* 18.068–18.168* 21.000–21.450* 24.890–24.990* 28.000–29.700* 50.000–54.000* Some frequency bands are not guaranteed. Depending on version • Mode : USB, LSB, CW, RTTY, AM, • Number of memory : 101 channels •...

  • Page 83: Options

    HM-36 HAND MICROPHONE Hand microphone equipped with the [UP]/[DOWN] switches. CT-16 SATELLITE INTERFACE UNIT Easy tuning when connecting another Icom VHF transceiver for instant satel- lite communications. OPTIONS EX-627 AUTOMATIC ANTENNA SELECTOR Automatically selects the antenna for the selected HF ham band. Manual se- lection is possible for the 50 MHz band.
  • Page 84 Count on us! A-5627H-1EX-q Printed in Japan 6-9-16 Kamihigashi, Hirano-ku, Osaka 547-0002 Japan © 1999 Icom Inc.

Table of Contents

Save PDF