Why does the displayed frequency on my Icom Transceiver not change properly?
If the displayed frequency on your Icom Transceiver isn't changing correctly, it might be due to the dial lock function being activated. Deactivate this function by pushing the [LOCK/SET] button several times to exit the setup. You can also push [EXIT/SET] mode screen or reset the CPU.
What to do if the Icom Transceiver displayed frequency does not change properly?
If the displayed frequency on your Icom Transceiver isn't changing correctly, it might be due to the dial lock function being activated. Try pushing the [LOCK/SPEED] button several times to deactivate this setting. If this doesn't solve the issue, consider resetting the CPU.
What to do if a fuse blows or the Icom IC-756PROII stops functioning?
If the Icom Transceiver stops functioning or a fuse blows, identify the source of the problem and replace the damaged fuse with a new one of the correct rating.
General| Brand | Icom |
|---|---|
| Model | IC-756PROII |
| Category | Transceiver |
| Language | English |
Instructions for ordering replacement parts.
Important guidelines for performing repairs.
Warning against incorrect power connections and excessive RF signal.
Covers frequency coverage, modes, memory channels, connectors, temperature, stability, power supply.
Details output power, modulation, spurious emissions, carrier suppression, and connector types.
Includes receive system, intermediate frequencies, sensitivity, selectivity, and audio output.
Covers matching impedance range, minimum operating power, tuning accuracy, and insertion loss.
Identifies major internal components visible from the top.
Identifies major internal components visible from the bottom.
Explains receiver construction, RF switching, bandpass filters, and pre-amplifiers.
Explains the mixing process converting receive signals to the 1st IF.
Details noise detection, gating, and 2nd IF amplification/filtering.
Explains 3rd mixer operation and DSP functions for digital filtering.
Describes digital passband tuning, gain control, signal metering, and audio amplification.
Details microphone amplifier, VOX, and DSP transmitter circuits.
Explains speech compression, IF amplification, mixing, and RF output stages.
Describes harmonic suppression, level control, and thermal management.
Explains PLL unit function, generating LO frequencies for dualwatch and scope.
Details matching circuit, detectors, motor control, and CPU port allocation.
Describes scope receiver operation and power supply distribution.
Details logic circuits for band selection and CPU port assignments.
Lists required test equipment and necessary connections.
Step-by-step procedures for adjusting PLL circuits.
Procedures for calibrating transmitter parameters like output power and gain.
Procedures for adjusting receiver peak sensitivity, distortion, and mixer balance.
Procedures for adjusting the antenna tuner, SWR detector, and meters.
List of mechanical and electrical parts for the front unit.
List of electrical components for the display unit.
List of parts for the main-A unit.
List of parts for the DSP-A board.
List of parts for the RF-B unit.
List of parts for the BPF-A unit.
List of parts for the preamp unit.
List of parts for the tuner-A unit.
List of parts for the CTRL-A unit.
List of parts for the filter-A unit.
List of parts for the chassis unit.
Electrical schematics and symbols for transistors and FETs.
Component layouts for the display board's top and bottom views.
Component layouts for the front panel boards (Mode, Phone, Key, Ten-Key).
Component layouts for internal boards (Memory, PBT, MIC, RIT).
Component layouts for Main-A and DSP-A units (top and bottom views).
Component layouts for the RF-B unit (top and bottom views).
Component layouts for BPF-A and Preamp boards (top and bottom views).
Component layouts for the PLL unit (top and bottom views).
Component layouts for the PA unit (top and bottom views).
Component layouts for the filter-A unit (top and bottom views).
Component layouts for the CTRL-A unit (top and bottom views).
Component layouts for the tuner-A board (top and bottom views).
Voltage distribution diagram for the front unit.
Voltage distribution diagram for the DSP-A board.
Voltage distribution diagrams for tuner-A, memory, and CTRL-A units.
Voltage distribution diagrams for the main-A unit.
Voltage distribution diagram for the RF-B unit.
Voltage distribution diagram for the PLL unit.
Voltage distribution diagrams for the PA and Filter-A units.
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