Icom IC-745 (IC 745 IC745) transceiver mods reviews software and diagrams

   
 
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21 April 2021, 12:44 UTC 


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Icom IC-745 (IC 745 IC745)
IC-745
Programming interface schematics for Icom:
Programming software for Icom IC-745 (IC 745 IC745) :
PDF User Manual for Icom IC-745 (IC 745 IC745) :Icom IC-745 Instruction Manual
PDF Adjusments Procedures Manual with schematics for Icom IC-745 (IC 745 IC745) :
Schematics for Icom IC-745 (IC 745 IC745) :

Mods for Icom IC-745 (IC 745 IC745) :
    Icom IC-745 (IC 745 IC745) RAM Card Backup Battery Replacement Instructions
    Icom IC-745 (IC 745 IC745) PROBLEM: Tuning counts slowly down
    Icom IC-745 (IC 745 IC745) Unlocked

Icom IC-745 (IC 745 IC745) technical specifications :  Icom IC-745 (IC 745 IC745) technical specifications



Icom IC-745 (IC 745 IC745) PROBLEM: Tuning counts slowly down

I have a problem with my 745. When I rang Bellevue, WA, they said: Never heard of it. My friend in LA who has the same pronlem got the same anser.

The problem is as follows:

The tuning counts slowly DOWN whether it's memory or VFO. I temporarily used the set by turning the dial in the UP direction faster than the countdown and then used the lock button when the set arrived on the desired frequency. The XIT?RIT can be used for small corrections.

My friend who has a complete professional lab at his disposal found a temporary fix. He grounded pin 40 of the I/O IC which steers the CPU. Everything workds fine except that you miss the slowest tuning speed and that the UP/DOWN button on the mic does not work. I did the same and my set work the same. The tuning is a little bit coarse now but usable except you have to be careful especially with RTTY or AMTOR.

The local ICOM repair shop is too busy at the moment with their normal work, and I don't like to be without this set for too ong a time.
I can't use the 730 to drive my linear at least not without a lot of trouble. I suspect thqt one of the two transisstors has gone but which? I just wonder if any of your readers has had the same problem and fixed it.

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