Icom IC-751 Common Questions page 7

Probable
Bad connection between logic and display units.
Causes:
Check the connectors J5 and J13 on the logic unit where the flex
Cure:
cables to the display unit are attached. If they look OK, and none of
their connector spring contacts flattened, replace the flex cables.
Low mic gain when using Heil mic element.
Symptom:
Install modification: In 751, change value of R264 on main unit to
Cure:
200k. In 751A, change value of R21 on AF-VR unit to 47k.
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