How to fix Icom IC-703 Transceiver when power does not come on?
If your Icom Transceiver isn't powering on, the DC power cable might not be properly connected, or the fuse could be blown. Also, if you're using a 12V battery, it might be exhausted. Reconnect the power cable correctly and check the battery voltage with the [POWER] pushed IN. Inspect the fuse (located in the DC power cable and the PA unit) and replace it if necessary.
What to do if no sound comes from the Icom IC-703 speaker?
If no sound is coming from the Icom Transceiver speaker, first, try rotating the [AF] knob clockwise to adjust the volume to a comfortable listening level. If that doesn't work, rotate the [SQL] knob counterclockwise to open the squelch. Ensure that the transceiver is not in transmitting mode by releasing the [PTT] button on the microphone. Lastly, verify the connection of any external speakers or headphones.
Details operational parameters including frequency coverage, power, sensitivity, and dimensions.
Explains the RF, IF, mixer, and demodulator circuits of the receiver.
Details the microphone amplifier, modulator, and RF output stages.
Describes the Phase-Locked Loop circuits for frequency generation.
Explains the antenna matching network and SWR detection circuits.
Details the voltage regulation and distribution across units.
Procedures for adjusting reference frequency and VCO lock voltages.
Calibration steps for transmit peak power, carrier suppression, and output.
Calibration steps for receiver peak output and noise blanker.
Configuration settings for S-meter, filter calibration, and power meter.
Adjustment procedures for PA unit's idling current and SWR detection.
Configuration settings for antenna tuner and tuner relay.
General| Frequency Range RX | 0.03-60 MHz |
|---|---|
| Modes | SSB, CW, AM, FM |
| Impedance | 50 Ohms |
| Power Output | 10 W |
| Voltage | 13.8V DC |
| Current Consumption TX | 2.5 A |
| Current Drain RX | 0.5 A |
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