[R-390] No Headphones Audio

[Roy Morgan]

(My manuals on the main computer are not at hand, so I make some assumptions here):

It seems likely that some connection from the audio module to the headphone jack is open. 

Do you get audio at the "Local Audio" terminals on the back of the radio?

If you connect the center (wiper) terminals of the Local Gain and Line Gain controls, what happens?

If you connect the Line Audio out terminal and Local Audio  output terminals on the rear of the radio, does the earphone jack work?

Have you tested your earphones with an ohm meter or other radio?

What is the resistance to ground at the earphone jack tip connection?  If zero or very low, suspect a short. 

Unplug the audio module connector and look for continuity from the local and line output pins to the rear panel connections. 

Roy Morgan
K1LKY Western Mass
K1LKY68 at gmail.com

> On Mar 12, 2022, at 7:52 PM, gary.biasini at shaw.ca wrote:
> 
> Greetings from the Great White North!
> 
> On an EAC 5570, all nicely cleaned up, I get no audio at all from the
> headphone jack.  Totally dead.