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Author Topic: icom 730, icom 735  (Read 2033 times)
KB3SXC
Member

Posts: 6




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« on: April 02, 2013, 06:31:14 AM »

Cannot transmit on either radio.  Reception is ok but on transmitting, no fluctution in amperage on power supply.  LC shows -0-.
Any suggestions, recommendations for repair near Washingto DC or Southern MD?
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W5CPT
Member

Posts: 557




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« Reply #1 on: April 02, 2013, 08:55:32 AM »

no fluctution in amperage on power supply.  LC shows -0-.

A little more information is needed here:
Have these radios worked in the past and now have stopped?
What mode were you using and into what were you transmitting? (Antenna - Dummy Load)
When you put the radios in to TX did the TX indicator light up?

Suggestions:
Hook the radios (one at a time) using a known good short piece of coax to a dummy load.
Put the radio in the AM mode on 20 meters.

On the 735, make sure the RF Power slide (behind the door) is up a bit.
On the 730 the RF Power control is the outer ring of the bottom knob just to the right of the headphone jack.

Press the TX button on the front of the radio (just to the left of the meter on the 735)(directly over the headphone jack on the 730)

And look at the Power Supply amp meter. It should move but not much depending on how high the RF Power control is set.
Also, making sure the Radio Meter is set to RF (button to left of meter on 730) (button behind door marked ALC/PO on the 735) watch the meter.

Note: Using a microphone and a SSB mode introduces too many variables. 

Try these and report back what you see. Tell us what the PS meter did/didn't do and what the Radio meter did/didn't do.
Also what do you mean by the "LC shows -0-?

Clint - W5CPT -

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